1 | /** @file wlan_mac_low.c |
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2 | * @brief Low-level WLAN MAC High Framework |
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3 | * |
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4 | * This contains the low-level code for accessing the WLAN MAC Low Framework. |
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5 | * |
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6 | * @copyright Copyright 2014-2016, Mango Communications. All rights reserved. |
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7 | * Distributed under the Mango Communications Reference Design License |
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8 | * See LICENSE.txt included in the design archive or |
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9 | * at http://mangocomm.com/802.11/license |
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10 | * |
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11 | * @author Chris Hunter (chunter [at] mangocomm.com) |
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12 | * @author Patrick Murphy (murphpo [at] mangocomm.com) |
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13 | * @author Erik Welsh (welsh [at] mangocomm.com) |
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14 | */ |
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15 | /***************************** Include Files *********************************/ |
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16 | |
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17 | // Xilinx / Standard library includes |
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18 | #include <xparameters.h> |
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19 | #include <xil_io.h> |
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20 | #include <xio.h> |
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21 | #include <stdlib.h> |
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22 | #include <string.h> |
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23 | |
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24 | // WARP Includes |
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25 | #include "w3_userio.h" |
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26 | #include "w3_ad_controller.h" |
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27 | #include "w3_clock_controller.h" |
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28 | #include "w3_iic_eeprom.h" |
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29 | #include "radio_controller.h" |
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30 | |
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31 | // WLAN includes |
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32 | #include "wlan_mac_time_util.h" |
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33 | #include "wlan_mac_mailbox_util.h" |
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34 | #include "wlan_mac_802_11_defs.h" |
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35 | #include "wlan_phy_util.h" |
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36 | #include "wlan_mac_low.h" |
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37 | |
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38 | // WLAN Exp includes |
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39 | #include "wlan_exp.h" |
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40 | |
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41 | |
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42 | /*************************** Constant Definitions ****************************/ |
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43 | |
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44 | #define DBG_PRINT 0 |
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45 | |
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46 | // Power / RSSI conversion |
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47 | #define POW_LOOKUP_SHIFT 3 // Shift from 10 bit RSSI to 7 bit for lookup |
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48 | |
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49 | |
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50 | /*********************** Global Variable Definitions *************************/ |
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51 | |
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52 | |
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53 | /*************************** Functions Prototypes ****************************/ |
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54 | |
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55 | |
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56 | /*************************** Variable Definitions ****************************/ |
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57 | volatile static phy_samp_rate_t gl_phy_samp_rate; ///< Current PHY sampling rate |
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58 | volatile static u32 mac_param_chan; ///< Current channel of the lower-level MAC |
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59 | volatile static u8 mac_param_band; ///< Current band of the lower-level MAC |
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60 | volatile static u8 mac_param_dsss_en; ///< Enable / Disable DSSS when possible |
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61 | volatile static s8 mac_param_ctrl_tx_pow; ///< Current transmit power (dBm) for control packets |
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62 | volatile static u32 mac_param_rx_filter; ///< Current filter applied to packet receptions |
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63 | volatile static u8 rx_pkt_buf; ///< Current receive buffer of the lower-level MAC |
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64 | |
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65 | static u32 cpu_low_status; ///< Status flags that are reported to upper-level MAC |
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66 | static u32 cpu_low_type; ///< wlan_exp CPU_LOW type that is reported to upperp-level MAC |
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67 | |
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68 | static wlan_ipc_msg_t ipc_msg_from_high; ///< Buffer for incoming IPC messages |
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69 | static u32 ipc_msg_from_high_payload[MAILBOX_BUFFER_MAX_NUM_WORDS]; ///< Buffer for payload of incoming IPC messages |
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70 | |
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71 | volatile static u8 allow_new_mpdu_tx; ///< Toggle for allowing new MPDU Tx requests to be processed |
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72 | volatile static s8 pkt_buf_pending_tx; ///< Internal state variable for knowing if an MPDU Tx request is pending |
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73 | |
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74 | // Callback function pointers |
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75 | static function_ptr_t frame_rx_callback; ///< User callback frame receptions |
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76 | static function_ptr_t frame_tx_callback; ///< User callback frame transmissions |
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77 | |
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78 | static function_ptr_t beacon_txrx_config_callback; |
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79 | static function_ptr_t mactime_change_callback; |
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80 | static function_ptr_t sample_rate_change_callback; |
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81 | |
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82 | static function_ptr_t ipc_low_param_callback; ///< User callback for IPC_MBOX_LOW_PARAM ipc calls |
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83 | |
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84 | // Unique transmit sequence number |
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85 | volatile static u64 unique_seq; |
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86 | |
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87 | // NOTE: this statically allocated space should be larger than the maximum number of attempts |
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88 | // dot11ShortRetryLimit+dot11LongRetryLimit-1 |
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89 | static wlan_mac_low_tx_details_t low_tx_details[50]; //TODO make a #define |
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90 | |
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91 | // Constant LUTs for MCS |
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92 | const static u16 mcs_to_n_dbps_nonht_lut[WLAN_MAC_NUM_MCS] = {24, 36, 48, 72, 96, 144, 192, 216}; |
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93 | const static u16 mcs_to_n_dbps_htmf_lut[WLAN_MAC_NUM_MCS] = {26, 52, 78, 104, 156, 208, 234, 260}; |
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94 | |
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95 | /******************************** Functions **********************************/ |
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96 | |
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97 | |
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98 | /*****************************************************************************/ |
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99 | /** |
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100 | * @brief Initialize MAC Low Framework |
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101 | * |
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102 | * This function initializes the MAC Low Framework by setting |
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103 | * up the hardware and other subsystems in the framework. |
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104 | * |
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105 | * @param type - Lower-level MAC type |
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106 | * @return int - Initialization status (0 = success) |
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107 | */ |
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108 | int wlan_mac_low_init(u32 type){ |
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109 | u32 status; |
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110 | rx_frame_info_t* rx_frame_info; |
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111 | tx_frame_info_t* tx_frame_info; |
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112 | u32 i; |
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113 | |
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114 | mac_param_dsss_en = 1; |
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115 | mac_param_band = RC_24GHZ; |
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116 | mac_param_ctrl_tx_pow = 10; |
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117 | cpu_low_status = 0; |
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118 | cpu_low_type = type; |
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119 | |
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120 | unique_seq = 0; |
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121 | |
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122 | mac_param_rx_filter = (RX_FILTER_FCS_ALL | RX_FILTER_HDR_ALL); |
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123 | |
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124 | frame_rx_callback = (function_ptr_t) wlan_null_callback; |
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125 | frame_tx_callback = (function_ptr_t) wlan_null_callback; |
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126 | ipc_low_param_callback = (function_ptr_t) wlan_null_callback; |
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127 | beacon_txrx_config_callback = (function_ptr_t) wlan_null_callback; |
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128 | mactime_change_callback = (function_ptr_t) wlan_null_callback; |
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129 | sample_rate_change_callback = (function_ptr_t) wlan_null_callback; |
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130 | allow_new_mpdu_tx = 1; |
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131 | pkt_buf_pending_tx = -1; // -1 is an invalid pkt_buf index |
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132 | |
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133 | status = w3_node_init(); |
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134 | |
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135 | if(status != 0) { |
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136 | xil_printf("Error in w3_node_init()! Exiting\n"); |
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137 | return -1; |
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138 | } |
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139 | |
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140 | // Initialize mailbox |
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141 | init_mailbox(); |
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142 | |
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143 | // Initialize packet buffers |
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144 | init_pkt_buf(); |
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145 | |
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146 | // *************************************************** |
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147 | // Initialize Transmit Packet Buffers |
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148 | // *************************************************** |
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149 | for(i = 0; i < NUM_TX_PKT_BUFS; i++){ |
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150 | tx_frame_info = (tx_frame_info_t*)TX_PKT_BUF_TO_ADDR(i); |
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151 | switch(i){ |
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152 | case TX_PKT_BUF_MPDU_1: |
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153 | case TX_PKT_BUF_MPDU_2: |
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154 | case TX_PKT_BUF_MPDU_3: |
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155 | switch(tx_frame_info->tx_pkt_buf_state){ |
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156 | case TX_PKT_BUF_UNINITIALIZED: |
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157 | case TX_PKT_BUF_HIGH_CTRL: |
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158 | // CPU High will initialize |
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159 | break; |
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160 | break; |
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161 | case TX_PKT_BUF_READY: |
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162 | case TX_PKT_BUF_DONE: |
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163 | // CPU Low rebooted after finishing old Tx |
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164 | // No way to know if CPU Low sent TX_DONE(p) message - must reset p.state here |
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165 | // Two potential races: |
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166 | // -CPU High just rebooted and will also attempt setting p.state=TX_PKT_BUF_HIGH_CTRL |
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167 | // No problem if both CPUs set state to TX_PKT_BUF_HIGH_CTRL |
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168 | // -CPU High did not reboot and will attempt tx_done_handler(p) |
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169 | // If p.state=TX_PKT_BUF_HIGH_CTRL when tx_done_handler(p) runs, CPU High will fail gracefully |
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170 | // If p.state set to TX_PKT_BUF_HIGH_CTRL during tx_done_handler(p), CPU High will succeed normally |
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171 | case TX_PKT_BUF_LOW_CTRL: |
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172 | // CPU Low rebooted after CPU High submitted packet for Tx |
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173 | // Release lock and reset state |
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174 | // CPU High will find this TX_PKT_BUF_HIGH_CTRL buffer in next ping/pong update |
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175 | default: |
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176 | // Something went wrong if tx_pkt_buf_state is something |
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177 | // other than one of the tx_pkt_buf_state_t enums. We'll |
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178 | // attempt to resolve the problem by explicitly setting |
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179 | // the state. |
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180 | tx_frame_info->tx_pkt_buf_state = TX_PKT_BUF_HIGH_CTRL; |
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181 | unlock_tx_pkt_buf(i); |
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182 | break; |
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183 | } |
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184 | break; |
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185 | case TX_PKT_BUF_BEACON: |
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186 | unlock_tx_pkt_buf(i); |
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187 | break; |
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188 | case TX_PKT_BUF_RTS: |
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189 | case TX_PKT_BUF_ACK_CTS: |
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190 | force_lock_tx_pkt_buf(i); |
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191 | tx_frame_info->tx_pkt_buf_state = TX_PKT_BUF_LOW_CTRL; |
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192 | default: |
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193 | break; |
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194 | } |
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195 | } |
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196 | // *************************************************** |
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197 | // Initialize Receive Packet Buffers |
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198 | // *************************************************** |
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199 | for(i = 0; i < NUM_RX_PKT_BUFS; i++){ |
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200 | rx_frame_info = (rx_frame_info_t*)RX_PKT_BUF_TO_ADDR(i); |
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201 | switch(rx_frame_info->rx_pkt_buf_state){ |
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202 | case RX_PKT_BUF_UNINITIALIZED: |
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203 | case RX_PKT_BUF_LOW_CTRL: |
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204 | default: |
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205 | // Something went wrong if rx_pkt_buf_state is something |
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206 | // other than one of the rx_pkt_buf_state_t enums. We'll |
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207 | // attempt to resolve the problem by explicitly setting |
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208 | // the state. |
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209 | force_lock_rx_pkt_buf(i); |
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210 | rx_frame_info->rx_pkt_buf_state = RX_PKT_BUF_LOW_CTRL; |
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211 | break; |
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212 | case RX_PKT_BUF_HIGH_CTRL: |
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213 | case RX_PKT_BUF_READY: |
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214 | // CPU Low rebooted after submitting packet for de-encapsulation/logging |
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215 | // Will be handled by CPU High, either because CPU High is about |
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216 | // to de-encapsulate/log p or just rebooted and will clean up |
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217 | break; |
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218 | } |
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219 | } |
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220 | |
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221 | // Create IPC message to receive into |
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222 | ipc_msg_from_high.payload_ptr = &(ipc_msg_from_high_payload[0]); |
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223 | |
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224 | // Point the PHY to an empty Rx Pkt Buffer |
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225 | wlan_mac_low_lock_empty_rx_pkt_buf(); |
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226 | |
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227 | // Move the PHY's starting address into the packet buffers by PHY_XX_PKT_BUF_PHY_HDR_OFFSET. |
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228 | // This accounts for the metadata located at the front of every packet buffer (Xx_mpdu_info) |
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229 | wlan_phy_rx_pkt_buf_phy_hdr_offset(PHY_RX_PKT_BUF_PHY_HDR_OFFSET); |
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230 | wlan_phy_tx_pkt_buf_phy_hdr_offset(PHY_TX_PKT_BUF_PHY_HDR_OFFSET); |
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231 | |
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232 | wlan_mac_reset(1); |
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233 | wlan_radio_init(); |
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234 | wlan_phy_init(); |
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235 | wlan_mac_hw_init(); |
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236 | wlan_mac_reset(0); |
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237 | |
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238 | // Initialize the HW info structure |
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239 | init_mac_hw_info(); |
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240 | |
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241 | // Set the NAV ignore addr to this HW address |
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242 | wlan_mac_low_set_nav_check_addr(get_mac_hw_addr_wlan()); |
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243 | |
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244 | return 0; |
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245 | } |
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246 | |
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247 | |
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248 | |
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249 | /*****************************************************************************/ |
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250 | /** |
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251 | * @brief Finish Initializing MAC Low Framework |
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252 | * |
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253 | * This function finishes the initialization and notifies the upper-level |
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254 | * MAC that it has finished booting. |
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255 | * |
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256 | * @param None |
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257 | * @return None |
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258 | */ |
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259 | void wlan_mac_low_init_finish(){ |
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260 | |
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261 | //Set the default PHY sample rate to 20 MSps |
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262 | set_phy_samp_rate(PHY_20M); |
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263 | |
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264 | // Update the CPU Low status |
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265 | cpu_low_status |= CPU_STATUS_INITIALIZED; |
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266 | |
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267 | wlan_mac_low_send_status(CPU_STATUS_REASON_BOOTED); |
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268 | |
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269 | } |
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270 | |
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271 | void wlan_mac_low_send_status(u8 cpu_status_reason){ |
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272 | wlan_ipc_msg_t ipc_msg_to_high; |
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273 | u32 ipc_msg_to_high_payload[2]; |
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274 | |
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275 | // Send a message to other processor to say that this processor is initialized and ready |
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276 | ipc_msg_to_high.msg_id = IPC_MBOX_MSG_ID(IPC_MBOX_CPU_STATUS); |
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277 | ipc_msg_to_high.arg0 = cpu_status_reason; |
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278 | ipc_msg_to_high.num_payload_words = 2; |
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279 | ipc_msg_to_high.payload_ptr = &(ipc_msg_to_high_payload[0]); |
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280 | ipc_msg_to_high_payload[0] = cpu_low_status; |
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281 | ipc_msg_to_high_payload[1] = cpu_low_type; |
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282 | |
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283 | write_mailbox_msg(&ipc_msg_to_high); |
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284 | } |
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285 | |
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286 | |
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287 | /*****************************************************************************/ |
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288 | /** |
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289 | * @brief Set the PHY Sampling Rate |
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290 | * |
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291 | * This function should be called to switch the PHY sampling rate between |
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292 | * 10/20/40 MSps. |
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293 | * |
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294 | * @param phy_samp_rate_t phy_samp_rate |
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295 | * @return None |
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296 | */ |
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297 | void set_phy_samp_rate(phy_samp_rate_t phy_samp_rate){ |
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298 | |
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299 | // Check sample rate argument |
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300 | // - Must be in [PHY_10M, PHY_20M, PHY_40M] |
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301 | if (!((phy_samp_rate == PHY_10M) || (phy_samp_rate == PHY_20M) || (phy_samp_rate == PHY_40M))) { |
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302 | return; |
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303 | } |
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304 | |
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305 | // Set global sample rate variable |
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306 | gl_phy_samp_rate = phy_samp_rate; |
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307 | |
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308 | // Assert PHY Tx/Rx and MAC Resets |
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309 | REG_SET_BITS(WLAN_RX_REG_CTRL, WLAN_RX_REG_CTRL_RESET); |
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310 | REG_SET_BITS(WLAN_TX_REG_CFG, WLAN_TX_REG_CFG_RESET); |
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311 | wlan_mac_reset(1); |
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312 | |
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313 | // DSSS Rx only supported at 20Msps |
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314 | switch(phy_samp_rate){ |
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315 | case PHY_10M: |
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316 | case PHY_40M: |
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317 | // Always disable DSSS when PHY sample rate is not 20 MSps |
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318 | wlan_phy_DSSS_rx_disable(); |
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319 | break; |
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320 | case PHY_20M: |
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321 | // Enable DSSS if global variable indicates it should be enabled and RF band allows it |
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322 | if ((mac_param_dsss_en) && (mac_param_band == RC_24GHZ)) { |
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323 | wlan_phy_DSSS_rx_enable(); |
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324 | } |
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325 | break; |
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326 | } |
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327 | |
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328 | // Configure auto-correlation packet detection |
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329 | // wlan_phy_rx_pktDet_autoCorr_ofdm_cfg(corr_thresh, energy_thresh, min_dur, post_wait) |
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330 | switch(phy_samp_rate){ |
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331 | case PHY_40M: |
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332 | //TODO: The 2 value is suspiciously low |
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333 | wlan_phy_rx_pktDet_autoCorr_ofdm_cfg(200, 2, 15, 0x3F); |
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334 | break; |
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335 | case PHY_10M: |
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336 | case PHY_20M: |
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337 | wlan_phy_rx_pktDet_autoCorr_ofdm_cfg(200, 9, 4, 0x3F); |
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338 | break; |
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339 | } |
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340 | |
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341 | // Set post Rx extension |
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342 | // Number of sample periods post-Rx the PHY waits before asserting Rx END - must be long enough for worst-case |
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343 | // decoding latency and should result in RX_END asserting 6 usec after the last sample was received |
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344 | switch(phy_samp_rate){ |
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345 | case PHY_40M: |
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346 | // 6us Extension |
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347 | wlan_phy_rx_set_extension(6*40); |
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348 | break; |
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349 | case PHY_20M: |
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350 | // 6us Extension |
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351 | wlan_phy_rx_set_extension(6*20); |
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352 | break; |
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353 | case PHY_10M: |
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354 | // 6us Extension |
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355 | wlan_phy_rx_set_extension(6*10); |
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356 | break; |
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357 | } |
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358 | |
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359 | // Set Tx duration extension, in units of sample periods |
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360 | switch(phy_samp_rate){ |
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361 | case PHY_40M: |
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362 | // 364 20MHz sample periods. |
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363 | // The extra 3 usec properly delays the assertion of TX END to match the assertion of RX END at the receiving node. |
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364 | wlan_phy_tx_set_extension(364); |
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365 | |
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366 | // Set extension from last samp output to RF Tx -> Rx transition |
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367 | // This delay allows the Tx pipeline to finish driving samples into DACs |
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368 | // and for DAC->RF frontend to finish output Tx waveform |
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369 | wlan_phy_tx_set_txen_extension(100); |
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370 | |
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371 | // Set extension from RF Rx -> Tx to un-blocking Rx samples |
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372 | wlan_phy_tx_set_rx_invalid_extension(300); |
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373 | break; |
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374 | case PHY_20M: |
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375 | // 182 20MHz sample periods. |
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376 | // The extra 3 usec properly delays the assertion of TX END to match the assertion of RX END at the receiving node. |
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377 | wlan_phy_tx_set_extension(182); |
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378 | |
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379 | // Set extension from last samp output to RF Tx -> Rx transition |
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380 | // This delay allows the Tx pipeline to finish driving samples into DACs |
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381 | // and for DAC->RF frontend to finish output Tx waveform |
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382 | wlan_phy_tx_set_txen_extension(50); |
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383 | |
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384 | // Set extension from RF Rx -> Tx to un-blocking Rx samples |
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385 | wlan_phy_tx_set_rx_invalid_extension(150); |
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386 | break; |
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387 | case PHY_10M: |
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388 | wlan_phy_tx_set_extension(91); |
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389 | |
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390 | // Set extension from last samp output to RF Tx -> Rx transition |
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391 | // This delay allows the Tx pipeline to finish driving samples into DACs |
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392 | // and for DAC->RF frontend to finish output Tx waveform |
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393 | wlan_phy_tx_set_txen_extension(25); |
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394 | |
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395 | // Set extension from RF Rx -> Tx to un-blocking Rx samples |
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396 | wlan_phy_tx_set_rx_invalid_extension(75); |
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397 | break; |
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398 | } |
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399 | |
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400 | // Set RF interface clocking and interp/decimation filters |
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401 | switch(phy_samp_rate){ |
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402 | case PHY_40M: |
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403 | // Set ADC_CLK=DAC_CLK=40MHz, interp_rate=decim_rate=1 |
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404 | clk_config_dividers(CLK_BASEADDR, 2, (CLK_SAMP_OUTSEL_AD_RFA | CLK_SAMP_OUTSEL_AD_RFB)); |
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405 | ad_config_filters(AD_BASEADDR, AD_ALL_RF, 1, 1); |
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406 | ad_spi_write(AD_BASEADDR, (AD_ALL_RF), 0x32, 0x2F); |
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407 | ad_spi_write(AD_BASEADDR, (AD_ALL_RF), 0x33, 0x08); |
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408 | break; |
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409 | case PHY_20M: |
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410 | // Set ADC_CLK=DAC_CLK=40MHz, interp_rate=decim_rate=2 |
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411 | clk_config_dividers(CLK_BASEADDR, 2, (CLK_SAMP_OUTSEL_AD_RFA | CLK_SAMP_OUTSEL_AD_RFB)); |
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412 | ad_config_filters(AD_BASEADDR, AD_ALL_RF, 2, 2); |
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413 | ad_spi_write(AD_BASEADDR, (AD_ALL_RF), 0x32, 0x27); |
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414 | ad_spi_write(AD_BASEADDR, (AD_ALL_RF), 0x33, 0x08); |
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415 | break; |
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416 | case PHY_10M: |
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417 | // Set ADC_CLK=DAC_CLK=20MHz, interp_rate=decim_rate=2 |
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418 | clk_config_dividers(CLK_BASEADDR, 4, (CLK_SAMP_OUTSEL_AD_RFA | CLK_SAMP_OUTSEL_AD_RFB)); |
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419 | ad_config_filters(AD_BASEADDR, AD_ALL_RF, 2, 2); |
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420 | ad_spi_write(AD_BASEADDR, (AD_ALL_RF), 0x32, 0x27); |
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421 | ad_spi_write(AD_BASEADDR, (AD_ALL_RF), 0x33, 0x08); |
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422 | break; |
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423 | } |
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424 | |
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425 | switch(phy_samp_rate){ |
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426 | case PHY_40M: |
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427 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_RXLPF_BW, 3); |
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428 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_TXLPF_BW, 3); |
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429 | break; |
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430 | case PHY_10M: |
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431 | case PHY_20M: |
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432 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_RXLPF_BW, 1); |
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433 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_TXLPF_BW, 1); |
---|
434 | break; |
---|
435 | } |
---|
436 | |
---|
437 | // AGC timing: capt_rssi_1, capt_rssi_2, capt_v_db, agc_done |
---|
438 | switch(phy_samp_rate){ |
---|
439 | case PHY_40M: |
---|
440 | wlan_agc_set_AGC_timing(10, 30, 90, 96); |
---|
441 | break; |
---|
442 | case PHY_10M: |
---|
443 | case PHY_20M: |
---|
444 | wlan_agc_set_AGC_timing(1, 30, 90, 96); |
---|
445 | break; |
---|
446 | } |
---|
447 | |
---|
448 | // Call user callback so it can deal with any changes that need to happen due to a change in sampling rate |
---|
449 | sample_rate_change_callback(gl_phy_samp_rate); |
---|
450 | |
---|
451 | // Deassert PHY Tx/Rx and MAC Resets |
---|
452 | REG_CLEAR_BITS(WLAN_RX_REG_CTRL, WLAN_RX_REG_CTRL_RESET); |
---|
453 | REG_CLEAR_BITS(WLAN_TX_REG_CFG, WLAN_TX_REG_CFG_RESET); |
---|
454 | wlan_mac_reset(0); |
---|
455 | |
---|
456 | // Let PHY Tx take control of radio TXEN/RXEN |
---|
457 | REG_CLEAR_BITS(WLAN_TX_REG_CFG, WLAN_TX_REG_CFG_SET_RC_RXEN); |
---|
458 | REG_SET_BITS(WLAN_TX_REG_CFG, WLAN_TX_REG_CFG_SET_RC_RXEN); |
---|
459 | } |
---|
460 | |
---|
461 | |
---|
462 | /*****************************************************************************/ |
---|
463 | /** |
---|
464 | * @brief Initialize the DCF Hardware Core |
---|
465 | * |
---|
466 | * This function initializes the DCF hardware core. |
---|
467 | * |
---|
468 | * @param None |
---|
469 | * @return None |
---|
470 | */ |
---|
471 | void wlan_mac_hw_init(){ |
---|
472 | // Enable blocking of the Rx PHY following good-FCS receptions and bad-FCS receptions |
---|
473 | // BLOCK_RX_ON_VALID_RXEND will block the Rx PHY on all RX_END events following valid RX_START events |
---|
474 | // This allows the wlan_exp framework to count and log bad FCS receptions |
---|
475 | // |
---|
476 | REG_SET_BITS(WLAN_MAC_REG_CONTROL, WLAN_MAC_CTRL_MASK_BLOCK_RX_ON_TX); |
---|
477 | |
---|
478 | // Enable the NAV counter |
---|
479 | REG_CLEAR_BITS(WLAN_MAC_REG_CONTROL, (WLAN_MAC_CTRL_MASK_DISABLE_NAV)); |
---|
480 | |
---|
481 | // Set sane defaults for MAC timing values. These will be overwritten by |
---|
482 | // low-level applications that need to specify these times (e.g. the DCF) |
---|
483 | wlan_mac_set_slot(9*10); |
---|
484 | wlan_mac_set_DIFS(28*10); |
---|
485 | wlan_mac_set_TxDIFS((28*10) - (TX_PHY_DLY_100NSEC)); |
---|
486 | wlan_mac_postTx_timer1_en(0); |
---|
487 | wlan_mac_postRx_timer2_en(0); |
---|
488 | wlan_mac_set_NAV_adj(0*10); |
---|
489 | wlan_mac_set_EIFS(88*10); |
---|
490 | |
---|
491 | // Set the TU target to 2^32-1 (max value) and hold TU_LATCH in reset |
---|
492 | // MAC Low application should re-enabled if needed |
---|
493 | wlan_mac_set_tu_target(0xFFFFFFFF); |
---|
494 | wlan_mac_reset_tu_target_latch(1); |
---|
495 | |
---|
496 | // Clear any stale Rx events |
---|
497 | wlan_mac_hw_clear_rx_started(); |
---|
498 | } |
---|
499 | |
---|
500 | |
---|
501 | |
---|
502 | /*****************************************************************************/ |
---|
503 | /** |
---|
504 | * @brief Send Exception to Upper-Level MAC |
---|
505 | * |
---|
506 | * This function generates an IPC message for the upper-level MAC |
---|
507 | * to tell it that something has gone wrong |
---|
508 | * |
---|
509 | * @param u32 reason |
---|
510 | * - reason code for the exception |
---|
511 | * @return None |
---|
512 | */ |
---|
513 | inline void wlan_mac_low_send_exception(u32 reason){ |
---|
514 | wlan_ipc_msg_t ipc_msg_to_high; |
---|
515 | u32 ipc_msg_to_high_payload[2]; |
---|
516 | |
---|
517 | // Update CPU Low status |
---|
518 | cpu_low_status |= CPU_STATUS_EXCEPTION; |
---|
519 | |
---|
520 | // Send an exception to CPU_HIGH along with a reason |
---|
521 | ipc_msg_to_high.msg_id = IPC_MBOX_MSG_ID(IPC_MBOX_CPU_STATUS); |
---|
522 | ipc_msg_to_high.arg0 = (u8)CPU_STATUS_REASON_EXCEPTION; |
---|
523 | ipc_msg_to_high.num_payload_words = 2; |
---|
524 | ipc_msg_to_high.payload_ptr = &(ipc_msg_to_high_payload[0]); |
---|
525 | ipc_msg_to_high_payload[0] = cpu_low_status; |
---|
526 | ipc_msg_to_high_payload[1] = reason; |
---|
527 | |
---|
528 | write_mailbox_msg(&ipc_msg_to_high); |
---|
529 | |
---|
530 | // Set the Hex display with the reason code and flash the LEDs |
---|
531 | cpu_error_halt(reason); |
---|
532 | } |
---|
533 | |
---|
534 | /*****************************************************************************/ |
---|
535 | /** |
---|
536 | * @brief Poll the Receive Frame Start |
---|
537 | * |
---|
538 | * This function will poll the hardware to see if the PHY is currently receiving or |
---|
539 | * has finished receiving a packet. This will then dispatch the current RX packet |
---|
540 | * buffer and PHY details to the frame_rx_callback(). The callback is responsible for |
---|
541 | * updating the current Rx packet buffer, typically required if the received packet |
---|
542 | * is passed to CPU High for further processing. |
---|
543 | * |
---|
544 | * @param None |
---|
545 | * @return u32 - Status (See MAC Polling defines in wlan_mac_low.h) |
---|
546 | */ |
---|
547 | inline u32 wlan_mac_low_poll_frame_rx(){ |
---|
548 | phy_rx_details_t phy_details; |
---|
549 | |
---|
550 | volatile u32 mac_hw_status; |
---|
551 | volatile u32 phy_hdr_params; |
---|
552 | |
---|
553 | int i = 0; |
---|
554 | |
---|
555 | u32 return_status = 0; |
---|
556 | |
---|
557 | // Read the MAC/PHY status |
---|
558 | mac_hw_status = wlan_mac_get_status(); |
---|
559 | |
---|
560 | // Check if PHY has started a new reception |
---|
561 | if(mac_hw_status & WLAN_MAC_STATUS_MASK_RX_PHY_STARTED) { |
---|
562 | |
---|
563 | // Check whether this is an OFDM or DSSS Rx |
---|
564 | if(wlan_mac_get_rx_phy_sel() == WLAN_MAC_PHY_RX_PHY_HDR_PHY_SEL_DSSS) { |
---|
565 | // DSSS Rx - PHY Rx length is already valid, other params unused for DSSS |
---|
566 | phy_details.phy_mode = PHY_MODE_DSSS; |
---|
567 | phy_details.N_DBPS = 0; |
---|
568 | |
---|
569 | // Strip off extra pre-MAC-header bytes used in DSSS frames; this adjustment allows the next |
---|
570 | // function to treat OFDM and DSSS payloads the same |
---|
571 | phy_details.length = wlan_mac_get_rx_phy_length() - 5; |
---|
572 | phy_details.mcs = 0; |
---|
573 | |
---|
574 | // Call the user callback to handle this Rx, capture return value |
---|
575 | return_status |= POLL_MAC_STATUS_RECEIVED_PKT; |
---|
576 | return_status |= frame_rx_callback(rx_pkt_buf, &phy_details); |
---|
577 | |
---|
578 | } else { |
---|
579 | // OFDM Rx - must wait for valid PHY header |
---|
580 | // Order of operations is critical here |
---|
581 | // 1) Read status first |
---|
582 | // 2) Read PHY header register second |
---|
583 | // 3) Check for complete PHY header - continue if complete |
---|
584 | // 4) Else check for early PHY reset - quit if reset |
---|
585 | |
---|
586 | while (1) { |
---|
587 | mac_hw_status = wlan_mac_get_status(); |
---|
588 | phy_hdr_params = wlan_mac_get_rx_phy_hdr_params(); |
---|
589 | |
---|
590 | if(i++ > 1000000) {xil_printf("Stuck in OFDM Rx PHY hdr check: 0x%08x 0x%08x\n", mac_hw_status, phy_hdr_params);} |
---|
591 | |
---|
592 | if(phy_hdr_params & WLAN_MAC_PHY_RX_PHY_HDR_READY) { |
---|
593 | // Rx PHY received enough bytes to decode PHY header |
---|
594 | // Exit loop and check PHY header params |
---|
595 | break; |
---|
596 | } |
---|
597 | if((mac_hw_status & WLAN_MAC_STATUS_MASK_RX_PHY_ACTIVE) == 0) { |
---|
598 | // Rx PHY went idle before asserting RX_PHY_HDR_READY |
---|
599 | // This only happens if the PHY is reset externally, possible if MAC starts a Tx during Rx |
---|
600 | // Only option is to reset RX_STARTED and wait for next Rx |
---|
601 | |
---|
602 | // There is a 1-cycle race in this case, because RX_END asserts 1 cycle before RX_PHY_HDR_READY in the |
---|
603 | // case of an invalid HT-SIG. The invalid HT-SIG generates an RX_END_ERROR which causes |
---|
604 | // RX_END to assert. The simple workaround used below is to re-read phy_hdr_params one last time |
---|
605 | // before concluding that the Rx PHY was reset unexpectedly |
---|
606 | break; |
---|
607 | } |
---|
608 | } |
---|
609 | |
---|
610 | // Re-read phy_hdr_params to resolve 1-cycle ambiguity in case of HT-SIG error |
---|
611 | phy_hdr_params = wlan_mac_get_rx_phy_hdr_params(); |
---|
612 | |
---|
613 | // Decide how to handle this waveform |
---|
614 | if(phy_hdr_params & WLAN_MAC_PHY_RX_PHY_HDR_READY) { |
---|
615 | // Received PHY header - decide whether to call MAC callback |
---|
616 | if( (phy_hdr_params & WLAN_MAC_PHY_RX_PHY_HDR_MASK_UNSUPPORTED) || |
---|
617 | (wlan_mac_get_rx_phy_mode() > 0x2) ) { |
---|
618 | // Valid HT-SIG but unsupported waveform |
---|
619 | // Rx PHY will hold ACTIVE until last samp but will not write payload |
---|
620 | // HT-SIG fields (MCS, length) can be safely read here if desired |
---|
621 | // Or detected VHT waveform (not supported), did not attempt decoding VHT-SIG |
---|
622 | //xil_printf("Quitting - WLAN_MAC_PHY_RX_PHY_HDR_MASK_UNSUPPORTED (MCS = %d, Length = %d)", wlan_mac_get_rx_phy_mcs(), wlan_mac_get_rx_phy_length()); |
---|
623 | |
---|
624 | } else if(phy_hdr_params & WLAN_MAC_PHY_RX_PHY_HDR_MASK_RX_ERROR) { |
---|
625 | // Invalid HT-SIG (CRC error, invalid RESERVED or TAIL bits, invalid LENGTH, etc) |
---|
626 | // Rx PHY has already released ACTIVE and will not write payload |
---|
627 | // HT-SIG fields (MCS, length) should not be trusted in this case |
---|
628 | //xil_printf("Quitting - WLAN_MAC_PHY_RX_PHY_HDR_MASK_RX_ERROR"); |
---|
629 | |
---|
630 | } else { |
---|
631 | // NONHT waveform or HTMF waveform with supported HT-SIG - PHY will write payload |
---|
632 | // Call lower MAC Rx callback |
---|
633 | // Callback can safely return anytime (before or after RX_END) |
---|
634 | |
---|
635 | phy_details.phy_mode = wlan_mac_get_rx_phy_mode(); |
---|
636 | phy_details.length = wlan_mac_get_rx_phy_length(); |
---|
637 | phy_details.mcs = wlan_mac_get_rx_phy_mcs(); |
---|
638 | phy_details.N_DBPS = wlan_mac_low_mcs_to_n_dbps(phy_details.mcs, phy_details.phy_mode); |
---|
639 | |
---|
640 | return_status |= POLL_MAC_STATUS_RECEIVED_PKT; |
---|
641 | return_status |= frame_rx_callback(rx_pkt_buf, &phy_details); |
---|
642 | } |
---|
643 | } else { |
---|
644 | // PHY went idle before PHY_HDR_DONE, probably due to external reset |
---|
645 | // The Rx PHY can be reset from software (only used in wlan_phy_init()) or hardware. |
---|
646 | // The hardware reset is asserted by the MAC core during Tx. Asserting Tx during Rx is |
---|
647 | // impossible with the normal DCF code, as packet det is treated as a busy medium. With a |
---|
648 | // custom MAC implementation that allows Tx during Rx this code block will catch the |
---|
649 | // unexpected reset events. |
---|
650 | |
---|
651 | // PHY header cannot be trusted in this case - do nothing and return |
---|
652 | |
---|
653 | }//END if(PHY_HDR_DONE) |
---|
654 | } //END if(OFDM Rx) |
---|
655 | |
---|
656 | // Clear the MAC status register RX_STARTED bit |
---|
657 | // By this point the framework and MAC are done with the current waveform, however it was handled. |
---|
658 | // The RX_STARTED bit is cleared in every case. It is important to only call clear_rx_started() after |
---|
659 | // the RX_STARTED latch has asserted. Calling it any other time creates a race that can miss Rx events |
---|
660 | wlan_mac_hw_clear_rx_started(); |
---|
661 | |
---|
662 | } //END if(PHY_RX_STARTED) |
---|
663 | |
---|
664 | return return_status; |
---|
665 | } |
---|
666 | |
---|
667 | /*****************************************************************************/ |
---|
668 | /** |
---|
669 | * @brief Poll for IPC Receptions |
---|
670 | * |
---|
671 | * This function is a non-blocking poll for IPC receptions from the upper-level MAC. |
---|
672 | * |
---|
673 | * @param None |
---|
674 | * @return None |
---|
675 | */ |
---|
676 | inline void wlan_mac_low_poll_ipc_rx(){ |
---|
677 | // Poll mailbox read msg |
---|
678 | if (read_mailbox_msg(&ipc_msg_from_high) == IPC_MBOX_SUCCESS) { |
---|
679 | wlan_mac_low_process_ipc_msg(&ipc_msg_from_high); |
---|
680 | } |
---|
681 | } |
---|
682 | |
---|
683 | |
---|
684 | |
---|
685 | /*****************************************************************************/ |
---|
686 | /** |
---|
687 | * @brief Process IPC Reception |
---|
688 | * |
---|
689 | * This is an internal function to the WLAN MAC Low framework to process |
---|
690 | * received IPC messages and call the appropriate callback. |
---|
691 | * |
---|
692 | * @param None |
---|
693 | * @return None |
---|
694 | */ |
---|
695 | void wlan_mac_low_process_ipc_msg(wlan_ipc_msg_t * msg){ |
---|
696 | wlan_ipc_msg_t ipc_msg_to_high; |
---|
697 | |
---|
698 | switch(IPC_MBOX_MSG_ID_TO_MSG(msg->msg_id)){ |
---|
699 | |
---|
700 | //--------------------------------------------------------------------- |
---|
701 | case IPC_MBOX_SET_MAC_TIME: |
---|
702 | switch(msg->arg0){ |
---|
703 | default: |
---|
704 | case 0: |
---|
705 | //Payload is an absolute MAC time that must be applied |
---|
706 | set_mac_time_usec( *(u64*)(msg->payload_ptr) ); |
---|
707 | mactime_change_callback( (*(s64*)(msg->payload_ptr))-((s64)get_mac_time_usec()) ); |
---|
708 | break; |
---|
709 | case 1: |
---|
710 | //Payload is a MAC time delta that must be applied |
---|
711 | apply_mac_time_delta_usec( *(s64*)(msg->payload_ptr)); |
---|
712 | mactime_change_callback( *(s64*)(msg->payload_ptr)); |
---|
713 | break; |
---|
714 | } |
---|
715 | break; |
---|
716 | |
---|
717 | //--------------------------------------------------------------------- |
---|
718 | case IPC_MBOX_TXRX_BEACON_CONFIGURE: { |
---|
719 | beacon_txrx_config_callback(msg->payload_ptr); |
---|
720 | } |
---|
721 | break; |
---|
722 | |
---|
723 | //--------------------------------------------------------------------- |
---|
724 | case IPC_MBOX_CPU_STATUS: { |
---|
725 | if(msg->arg0 == (u8)CPU_STATUS_REASON_BOOTED){ |
---|
726 | // If CPU_HIGH just booted, we should re-inform it of our CPU status |
---|
727 | wlan_mac_low_send_status(CPU_STATUS_REASON_RESPONSE); |
---|
728 | } |
---|
729 | } |
---|
730 | break; |
---|
731 | |
---|
732 | //--------------------------------------------------------------------- |
---|
733 | case IPC_MBOX_MEM_READ_WRITE: { |
---|
734 | switch(msg->arg0){ |
---|
735 | case IPC_REG_WRITE_MODE: { |
---|
736 | u32 * payload_to_write = (u32*)((u8*)ipc_msg_from_high_payload + sizeof(ipc_reg_read_write_t)); |
---|
737 | |
---|
738 | // IMPORTANT: this memcpy assumes the payload provided by CPU high is ready as-is |
---|
739 | // Any byte swapping (i.e. for payloads that arrive over Ethernet) *must* be performed |
---|
740 | // before the payload is passed to this function |
---|
741 | memcpy((u8*)(((ipc_reg_read_write_t*)ipc_msg_from_high_payload)->baseaddr), |
---|
742 | (u8*)payload_to_write, |
---|
743 | (sizeof(u32) * ((ipc_reg_read_write_t*)ipc_msg_from_high_payload)->num_words)); |
---|
744 | } |
---|
745 | break; |
---|
746 | |
---|
747 | case IPC_REG_READ_MODE: { |
---|
748 | /* |
---|
749 | xil_printf("\nCPU Low Read:\n"); |
---|
750 | xil_printf(" Addr: 0x%08x\n", (u32*)((ipc_reg_read_write*)ipc_msg_from_high_payload)->baseaddr); |
---|
751 | xil_printf(" N Wrds: %d\n", ((ipc_reg_read_write*)ipc_msg_from_high_payload)->num_words); |
---|
752 | |
---|
753 | xil_printf("Mem[0x%08x] = 0x%08x\n", |
---|
754 | (u32*)((ipc_reg_read_write*)ipc_msg_from_high_payload)->baseaddr, |
---|
755 | Xil_In32((u32*)((ipc_reg_read_write*)ipc_msg_from_high_payload)->baseaddr)); |
---|
756 | */ |
---|
757 | ipc_msg_to_high.msg_id = IPC_MBOX_MSG_ID(IPC_MBOX_MEM_READ_WRITE); |
---|
758 | ipc_msg_to_high.num_payload_words = ((ipc_reg_read_write_t*)ipc_msg_from_high_payload)->num_words; |
---|
759 | ipc_msg_to_high.payload_ptr = (u32*)((ipc_reg_read_write_t*)ipc_msg_from_high_payload)->baseaddr; |
---|
760 | |
---|
761 | write_mailbox_msg(&ipc_msg_to_high); |
---|
762 | } |
---|
763 | break; |
---|
764 | } |
---|
765 | } |
---|
766 | break; |
---|
767 | |
---|
768 | //--------------------------------------------------------------------- |
---|
769 | case IPC_MBOX_LOW_PARAM: { |
---|
770 | switch(msg->arg0){ |
---|
771 | case IPC_REG_WRITE_MODE: { |
---|
772 | switch(ipc_msg_from_high_payload[0]){ |
---|
773 | case LOW_PARAM_BB_GAIN: { |
---|
774 | if(ipc_msg_from_high_payload[1] <= 3){ |
---|
775 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_TXGAIN_BB, ipc_msg_from_high_payload[1]); |
---|
776 | } |
---|
777 | } |
---|
778 | break; |
---|
779 | |
---|
780 | case LOW_PARAM_LINEARITY_PA: { |
---|
781 | if(ipc_msg_from_high_payload[1] <= 3){ |
---|
782 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_TXLINEARITY_PADRIVER, ipc_msg_from_high_payload[1]); |
---|
783 | } |
---|
784 | } |
---|
785 | break; |
---|
786 | |
---|
787 | case LOW_PARAM_LINEARITY_VGA: { |
---|
788 | if(ipc_msg_from_high_payload[1] <= 3){ |
---|
789 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_TXLINEARITY_VGA, ipc_msg_from_high_payload[1]); |
---|
790 | } |
---|
791 | } |
---|
792 | break; |
---|
793 | |
---|
794 | case LOW_PARAM_LINEARITY_UPCONV: { |
---|
795 | if(ipc_msg_from_high_payload[1] <= 3){ |
---|
796 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_TXLINEARITY_UPCONV, ipc_msg_from_high_payload[1]); |
---|
797 | } |
---|
798 | } |
---|
799 | break; |
---|
800 | |
---|
801 | case LOW_PARAM_AD_SCALING: { |
---|
802 | ad_spi_write(AD_BASEADDR, AD_ALL_RF, 0x36, (0x1F & ipc_msg_from_high_payload[1])); |
---|
803 | ad_spi_write(AD_BASEADDR, AD_ALL_RF, 0x37, (0x1F & ipc_msg_from_high_payload[2])); |
---|
804 | ad_spi_write(AD_BASEADDR, AD_ALL_RF, 0x35, (0x1F & ipc_msg_from_high_payload[3])); |
---|
805 | } |
---|
806 | break; |
---|
807 | |
---|
808 | case LOW_PARAM_PKT_DET_MIN_POWER: { |
---|
809 | if( ipc_msg_from_high_payload[1]&0xFF000000 ){ |
---|
810 | wlan_phy_enable_req_both_pkt_det(); |
---|
811 | //The value sent from wlan_exp will be unsigned with 0 representing PKT_DET_MIN_POWER_MIN |
---|
812 | wlan_mac_low_set_pkt_det_min_power((ipc_msg_from_high_payload[1]&0x000000FF) - PKT_DET_MIN_POWER_MIN); |
---|
813 | |
---|
814 | } else { |
---|
815 | wlan_phy_disable_req_both_pkt_det(); |
---|
816 | } |
---|
817 | } |
---|
818 | break; |
---|
819 | |
---|
820 | case LOW_PARAM_PHY_SAMPLE_RATE: { |
---|
821 | set_phy_samp_rate(ipc_msg_from_high_payload[1]); |
---|
822 | } |
---|
823 | break; |
---|
824 | |
---|
825 | default: { |
---|
826 | ipc_low_param_callback(IPC_REG_WRITE_MODE, ipc_msg_from_high_payload); |
---|
827 | } |
---|
828 | break; |
---|
829 | } |
---|
830 | } |
---|
831 | break; |
---|
832 | |
---|
833 | case IPC_REG_READ_MODE: { |
---|
834 | // Read Mode is not supported |
---|
835 | // |
---|
836 | // NOTE: This is due to the fact that IPC messages in CPU low can take an infinitely long amount of |
---|
837 | // to return given that the sending and receiving of wireless data takes precedent. Therefore, |
---|
838 | // it is not good to try to return values from CPU low since there is no guarantee when the values |
---|
839 | // will be available. |
---|
840 | // |
---|
841 | u32 ret_val = 0; |
---|
842 | |
---|
843 | ipc_msg_to_high.msg_id = IPC_MBOX_MSG_ID(IPC_MBOX_LOW_PARAM); |
---|
844 | ipc_msg_to_high.num_payload_words = 0; |
---|
845 | ipc_msg_to_high.payload_ptr = (u32 *)&ret_val; |
---|
846 | |
---|
847 | write_mailbox_msg(&ipc_msg_to_high); |
---|
848 | } |
---|
849 | break; |
---|
850 | } |
---|
851 | } |
---|
852 | break; |
---|
853 | |
---|
854 | //--------------------------------------------------------------------- |
---|
855 | case IPC_MBOX_CONFIG_CHANNEL: { |
---|
856 | wlan_mac_low_set_radio_channel(ipc_msg_from_high_payload[0]); |
---|
857 | } |
---|
858 | break; |
---|
859 | |
---|
860 | //--------------------------------------------------------------------- |
---|
861 | case IPC_MBOX_LOW_RANDOM_SEED: { |
---|
862 | srand(ipc_msg_from_high_payload[0]); |
---|
863 | } |
---|
864 | break; |
---|
865 | |
---|
866 | //--------------------------------------------------------------------- |
---|
867 | case IPC_MBOX_CONFIG_TX_CTRL_POW: { |
---|
868 | mac_param_ctrl_tx_pow = (s8)ipc_msg_from_high_payload[0]; |
---|
869 | } |
---|
870 | break; |
---|
871 | |
---|
872 | //--------------------------------------------------------------------- |
---|
873 | case IPC_MBOX_CONFIG_RX_FILTER: { |
---|
874 | u32 filter_mode_hi = (u32)ipc_msg_from_high_payload[0]; |
---|
875 | u32 filter_mode_lo = 0; |
---|
876 | |
---|
877 | if((filter_mode_hi & RX_FILTER_FCS_MASK) == RX_FILTER_FCS_NOCHANGE){ |
---|
878 | filter_mode_lo |= (mac_param_rx_filter & RX_FILTER_FCS_MASK); |
---|
879 | } else { |
---|
880 | filter_mode_lo |= (filter_mode_hi & RX_FILTER_FCS_MASK); |
---|
881 | } |
---|
882 | |
---|
883 | if((filter_mode_hi & RX_FILTER_HDR_NOCHANGE) == RX_FILTER_HDR_NOCHANGE){ |
---|
884 | filter_mode_lo |= (mac_param_rx_filter & RX_FILTER_HDR_NOCHANGE); |
---|
885 | } else { |
---|
886 | filter_mode_lo |= (filter_mode_hi & RX_FILTER_HDR_NOCHANGE); |
---|
887 | } |
---|
888 | |
---|
889 | mac_param_rx_filter = filter_mode_lo; |
---|
890 | } |
---|
891 | break; |
---|
892 | |
---|
893 | //--------------------------------------------------------------------- |
---|
894 | case IPC_MBOX_CONFIG_RX_ANT_MODE: { |
---|
895 | wlan_rx_config_ant_mode(ipc_msg_from_high_payload[0]); |
---|
896 | } |
---|
897 | break; |
---|
898 | |
---|
899 | //--------------------------------------------------------------------- |
---|
900 | case IPC_MBOX_CONFIG_DSSS_EN: { |
---|
901 | if (ipc_msg_from_high_payload[0] == 1) { |
---|
902 | // xil_printf("Enabling DSSS\n"); |
---|
903 | wlan_mac_low_DSSS_rx_enable(); |
---|
904 | } else { |
---|
905 | // xil_printf("Disabling DSSS\n"); |
---|
906 | wlan_mac_low_DSSS_rx_disable(); |
---|
907 | } |
---|
908 | } |
---|
909 | break; |
---|
910 | |
---|
911 | //--------------------------------------------------------------------- |
---|
912 | case IPC_MBOX_TX_MPDU_READY: { |
---|
913 | u8 tx_pkt_buf; |
---|
914 | tx_pkt_buf = msg->arg0; |
---|
915 | if(tx_pkt_buf < NUM_TX_PKT_BUFS){ |
---|
916 | // Message is an indication that a Tx Pkt Buf needs processing |
---|
917 | if(allow_new_mpdu_tx){ |
---|
918 | wlan_mac_low_proc_pkt_buf( tx_pkt_buf ); |
---|
919 | } else { |
---|
920 | pkt_buf_pending_tx = tx_pkt_buf; |
---|
921 | } |
---|
922 | } |
---|
923 | } |
---|
924 | break; |
---|
925 | } |
---|
926 | } |
---|
927 | |
---|
928 | |
---|
929 | |
---|
930 | /*****************************************************************************/ |
---|
931 | /** |
---|
932 | * @brief Disable New MPDU Transmissions |
---|
933 | * |
---|
934 | * This function will prevent any future MPDU transmission requests from |
---|
935 | * being accepted. |
---|
936 | * |
---|
937 | * @param None |
---|
938 | * @return None |
---|
939 | * |
---|
940 | */ |
---|
941 | void wlan_mac_low_disable_new_mpdu_tx(){ |
---|
942 | allow_new_mpdu_tx = 0; |
---|
943 | } |
---|
944 | |
---|
945 | |
---|
946 | |
---|
947 | /*****************************************************************************/ |
---|
948 | /** |
---|
949 | * @brief Enable New MPDU Transmissions |
---|
950 | * |
---|
951 | * This function will allow future MPDU transmission requests from |
---|
952 | * being accepted. |
---|
953 | * |
---|
954 | * @param None |
---|
955 | * @return None |
---|
956 | * |
---|
957 | */ |
---|
958 | void wlan_mac_low_enable_new_mpdu_tx(){ |
---|
959 | if(allow_new_mpdu_tx == 0){ |
---|
960 | allow_new_mpdu_tx = 1; |
---|
961 | if(pkt_buf_pending_tx != -1){ |
---|
962 | wlan_mac_low_proc_pkt_buf(pkt_buf_pending_tx); |
---|
963 | pkt_buf_pending_tx = -1; |
---|
964 | } |
---|
965 | } |
---|
966 | } |
---|
967 | |
---|
968 | |
---|
969 | |
---|
970 | /*****************************************************************************/ |
---|
971 | /** |
---|
972 | * @brief Set the radio channel |
---|
973 | * |
---|
974 | * This function will set the radio channel for CPU LOW |
---|
975 | * |
---|
976 | * @param channel - Radio channel |
---|
977 | * @return None |
---|
978 | * |
---|
979 | */ |
---|
980 | void wlan_mac_low_set_radio_channel(u32 channel){ |
---|
981 | |
---|
982 | mac_param_chan = channel; |
---|
983 | |
---|
984 | if (wlan_verify_channel(mac_param_chan) == XST_SUCCESS) { |
---|
985 | if(mac_param_chan <= 14){ |
---|
986 | mac_param_band = RC_24GHZ; |
---|
987 | |
---|
988 | // Enable DSSS if global variable indicates it should be enabled and PHY sample rate allows it |
---|
989 | if ((mac_param_dsss_en) && (gl_phy_samp_rate == PHY_20M)) { |
---|
990 | wlan_phy_DSSS_rx_enable(); |
---|
991 | } |
---|
992 | } else { |
---|
993 | mac_param_band = RC_5GHZ; |
---|
994 | |
---|
995 | // Always disable DSSS when in the 5 GHZ band |
---|
996 | wlan_phy_DSSS_rx_disable(); |
---|
997 | } |
---|
998 | |
---|
999 | if(channel >= 36){ |
---|
1000 | // Adjust Tx baseband gain when switching to 5GHz channels; this adjustment makes |
---|
1001 | // the actual Tx power set via the Tx VGA more accurate |
---|
1002 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_TXGAIN_BB, 3); |
---|
1003 | } else { |
---|
1004 | radio_controller_setRadioParam(RC_BASEADDR, RC_ALL_RF, RC_PARAMID_TXGAIN_BB, 1); |
---|
1005 | } |
---|
1006 | |
---|
1007 | radio_controller_setCenterFrequency(RC_BASEADDR, (RC_ALL_RF), mac_param_band, wlan_mac_low_wlan_chan_to_rc_chan(mac_param_chan)); |
---|
1008 | wlan_mac_reset_NAV_counter(); |
---|
1009 | |
---|
1010 | } else { |
---|
1011 | xil_printf("Invalid channel selection %d\n", mac_param_chan); |
---|
1012 | } |
---|
1013 | } |
---|
1014 | |
---|
1015 | |
---|
1016 | |
---|
1017 | /*****************************************************************************/ |
---|
1018 | /** |
---|
1019 | * @brief Enable / Disable DSSS RX |
---|
1020 | * |
---|
1021 | * DSSS RX must be disabled when in the 5 GHz band or when the PHY sample rate |
---|
1022 | * is not 20 MSps. However, the low framework will maintain what the state |
---|
1023 | * should be when in the 2.4 GHz band and the PHY sample rate is 20 MSps |
---|
1024 | * |
---|
1025 | * @param None |
---|
1026 | * @return None |
---|
1027 | * |
---|
1028 | */ |
---|
1029 | void wlan_mac_low_DSSS_rx_enable() { |
---|
1030 | mac_param_dsss_en = 1; |
---|
1031 | |
---|
1032 | // Only enable DSSS if in 2.4 GHz band and phy sample rate is 20 |
---|
1033 | if ((mac_param_band == RC_24GHZ) && (gl_phy_samp_rate == PHY_20M)) { |
---|
1034 | wlan_phy_DSSS_rx_enable(); |
---|
1035 | } |
---|
1036 | } |
---|
1037 | |
---|
1038 | |
---|
1039 | void wlan_mac_low_DSSS_rx_disable() { |
---|
1040 | mac_param_dsss_en = 0; |
---|
1041 | wlan_phy_DSSS_rx_disable(); |
---|
1042 | } |
---|
1043 | |
---|
1044 | |
---|
1045 | |
---|
1046 | /*****************************************************************************/ |
---|
1047 | /** |
---|
1048 | * @brief Process a Tx Packet Buffer for Transmission |
---|
1049 | * |
---|
1050 | * This function can be called directly via the IPC_MBOX_TX_MPDU_READY message |
---|
1051 | * or asynchronously if allow_new_mpdu_tx is enabled. |
---|
1052 | * |
---|
1053 | * @param tx_pkt_buf - u16 packet buffer index |
---|
1054 | * @return None |
---|
1055 | * |
---|
1056 | */ |
---|
1057 | void wlan_mac_low_proc_pkt_buf(u16 tx_pkt_buf){ |
---|
1058 | u32 status; |
---|
1059 | tx_frame_info_t * tx_frame_info; |
---|
1060 | mac_header_80211 * tx_80211_header; |
---|
1061 | u32 is_locked, owner; |
---|
1062 | u32 low_tx_details_size; |
---|
1063 | wlan_ipc_msg_t ipc_msg_to_high; |
---|
1064 | ltg_packet_id_t* pkt_id; |
---|
1065 | |
---|
1066 | if(tx_pkt_buf >= NUM_TX_PKT_BUFS){ |
---|
1067 | xil_printf("Error: Tx Pkt Buf index exceeds NUM_TX_PKT_BUFS\n"); |
---|
1068 | return; |
---|
1069 | } |
---|
1070 | |
---|
1071 | tx_frame_info = (tx_frame_info_t*)TX_PKT_BUF_TO_ADDR(tx_pkt_buf); |
---|
1072 | |
---|
1073 | switch(tx_frame_info->tx_pkt_buf_state){ |
---|
1074 | // ---- Normal Tx process - buffer contains packet ready for Tx ---- |
---|
1075 | case TX_PKT_BUF_READY: |
---|
1076 | if(lock_tx_pkt_buf(tx_pkt_buf) != PKT_BUF_MUTEX_SUCCESS){ |
---|
1077 | wlan_printf(PL_ERROR, "Error: unable to lock TX pkt_buf %d\n", tx_pkt_buf); |
---|
1078 | |
---|
1079 | get_tx_pkt_buf_status(tx_pkt_buf, &is_locked, &owner); |
---|
1080 | |
---|
1081 | wlan_printf(PL_ERROR, " TX pkt_buf %d status: isLocked = %d, owner = %d\n", tx_pkt_buf, is_locked, owner); |
---|
1082 | tx_frame_info->tx_pkt_buf_state = TX_PKT_BUF_HIGH_CTRL; |
---|
1083 | |
---|
1084 | } else { |
---|
1085 | |
---|
1086 | tx_frame_info->tx_pkt_buf_state = TX_PKT_BUF_LOW_CTRL; |
---|
1087 | |
---|
1088 | tx_frame_info->delay_accept = (u32)(get_mac_time_usec() - tx_frame_info->timestamp_create); |
---|
1089 | |
---|
1090 | // Get pointer to start of MAC header in packet buffer |
---|
1091 | tx_80211_header = (mac_header_80211*)(TX_PKT_BUF_TO_ADDR(tx_pkt_buf)+PHY_TX_PKT_BUF_MPDU_OFFSET); |
---|
1092 | |
---|
1093 | // Insert sequence number here |
---|
1094 | tx_80211_header->sequence_control = ((tx_80211_header->sequence_control) & 0xF) | ( (unique_seq&0xFFF)<<4 ); |
---|
1095 | |
---|
1096 | if((tx_frame_info->flags) & TX_MPDU_FLAGS_FILL_UNIQ_SEQ){ |
---|
1097 | // Fill unique sequence number into LTG payload |
---|
1098 | pkt_id = (ltg_packet_id_t*)((u8*)tx_80211_header + sizeof(mac_header_80211)); |
---|
1099 | pkt_id->unique_seq = unique_seq; |
---|
1100 | } |
---|
1101 | |
---|
1102 | //Increment the global unique sequence number |
---|
1103 | unique_seq++; |
---|
1104 | |
---|
1105 | // Submit the MPDU for transmission - this callback will return only when the MPDU Tx is |
---|
1106 | // complete (after all re-transmissions, ACK Rx, timeouts, etc.) |
---|
1107 | // |
---|
1108 | // If a frame_tx_callback is not provided, the wlan_null_callback will always |
---|
1109 | // return 0 (ie TX_MPDU_RESULT_SUCCESS). |
---|
1110 | // |
---|
1111 | status = frame_tx_callback(tx_pkt_buf, low_tx_details); |
---|
1112 | |
---|
1113 | //Record the total time this MPDU spent in the Tx state machine |
---|
1114 | tx_frame_info->delay_done = (u32)(get_mac_time_usec() - (tx_frame_info->timestamp_create + (u64)(tx_frame_info->delay_accept))); |
---|
1115 | |
---|
1116 | low_tx_details_size = (tx_frame_info->num_tx_attempts)*sizeof(wlan_mac_low_tx_details_t); |
---|
1117 | |
---|
1118 | if(status == TX_MPDU_RESULT_SUCCESS){ |
---|
1119 | tx_frame_info->tx_result = TX_MPDU_RESULT_SUCCESS; |
---|
1120 | } else { |
---|
1121 | tx_frame_info->tx_result = TX_MPDU_RESULT_FAILURE; |
---|
1122 | } |
---|
1123 | |
---|
1124 | tx_frame_info->tx_pkt_buf_state = TX_PKT_BUF_DONE; |
---|
1125 | |
---|
1126 | //Revert the state of the packet buffer and return control to CPU High |
---|
1127 | if(unlock_tx_pkt_buf(tx_pkt_buf) != PKT_BUF_MUTEX_SUCCESS){ |
---|
1128 | wlan_printf(PL_ERROR, "Error: unable to unlock TX pkt_buf %d\n", tx_pkt_buf); |
---|
1129 | wlan_mac_low_send_exception(WLAN_ERROR_CODE_CPU_LOW_TX_MUTEX); |
---|
1130 | tx_frame_info->tx_pkt_buf_state = TX_PKT_BUF_HIGH_CTRL; |
---|
1131 | } else { |
---|
1132 | ipc_msg_to_high.msg_id = IPC_MBOX_MSG_ID(IPC_MBOX_TX_MPDU_DONE); |
---|
1133 | |
---|
1134 | //Add the per-Tx-event details to the IPC message so CPU High can add them to the log as TX_LOW entries |
---|
1135 | if(low_tx_details != NULL){ |
---|
1136 | ipc_msg_to_high.payload_ptr = (u32*)low_tx_details; |
---|
1137 | |
---|
1138 | //Make sure we don't overfill the IPC mailbox with TX_LOW data; truncate the Tx details if necessary |
---|
1139 | if(low_tx_details_size < (MAILBOX_BUFFER_MAX_NUM_WORDS << 2)){ |
---|
1140 | ipc_msg_to_high.num_payload_words = ( low_tx_details_size ) >> 2; // # of u32 words |
---|
1141 | } else { |
---|
1142 | ipc_msg_to_high.num_payload_words = (((MAILBOX_BUFFER_MAX_NUM_WORDS << 2) / sizeof(wlan_mac_low_tx_details_t)) * sizeof(wlan_mac_low_tx_details_t)) >> 2; // # of u32 words |
---|
1143 | } |
---|
1144 | } else { |
---|
1145 | ipc_msg_to_high.num_payload_words = 0; |
---|
1146 | ipc_msg_to_high.payload_ptr = NULL; |
---|
1147 | } |
---|
1148 | ipc_msg_to_high.arg0 = tx_pkt_buf; |
---|
1149 | write_mailbox_msg(&ipc_msg_to_high); |
---|
1150 | } |
---|
1151 | } |
---|
1152 | break; |
---|
1153 | // ---- Something went wrong - TX_READY message didn't match state of pkt buf ---- |
---|
1154 | default: |
---|
1155 | case TX_PKT_BUF_LOW_CTRL: |
---|
1156 | // CPU Low responsible for any LOW_CTRL buffers |
---|
1157 | // Don't transmit - just clean up and return |
---|
1158 | tx_frame_info->tx_pkt_buf_state = TX_PKT_BUF_HIGH_CTRL; |
---|
1159 | case TX_PKT_BUF_UNINITIALIZED: |
---|
1160 | case TX_PKT_BUF_DONE: |
---|
1161 | case TX_PKT_BUF_HIGH_CTRL: |
---|
1162 | // CPU High will handle it eventually |
---|
1163 | // Ensure CPU Low doesn't own lock then return |
---|
1164 | unlock_tx_pkt_buf(tx_pkt_buf); |
---|
1165 | break; |
---|
1166 | } |
---|
1167 | } |
---|
1168 | |
---|
1169 | |
---|
1170 | |
---|
1171 | /*****************************************************************************/ |
---|
1172 | /** |
---|
1173 | * @brief Notify upper-level MAC of frame reception |
---|
1174 | * |
---|
1175 | * Sends an IPC message to the upper-level MAC to notify it that a frame has been |
---|
1176 | * received and is ready to be processed |
---|
1177 | * |
---|
1178 | * @param None |
---|
1179 | * @return None |
---|
1180 | * |
---|
1181 | * @note This function assumes it is called in the same context where rx_pkt_buf is still valid. |
---|
1182 | */ |
---|
1183 | void wlan_mac_low_frame_ipc_send(){ |
---|
1184 | wlan_ipc_msg_t ipc_msg_to_high; |
---|
1185 | |
---|
1186 | ipc_msg_to_high.msg_id = IPC_MBOX_MSG_ID(IPC_MBOX_RX_MPDU_READY); |
---|
1187 | ipc_msg_to_high.num_payload_words = 0; |
---|
1188 | ipc_msg_to_high.arg0 = rx_pkt_buf; |
---|
1189 | |
---|
1190 | write_mailbox_msg(&ipc_msg_to_high); |
---|
1191 | } |
---|
1192 | |
---|
1193 | |
---|
1194 | |
---|
1195 | /*****************************************************************************/ |
---|
1196 | /** |
---|
1197 | * @brief Set Frame Reception Callback |
---|
1198 | * |
---|
1199 | * Tells the framework which function should be called when the PHY begins processing a frame reception |
---|
1200 | * |
---|
1201 | * @param callback - Pointer to callback function |
---|
1202 | * @return None |
---|
1203 | */ |
---|
1204 | inline void wlan_mac_low_set_frame_rx_callback(function_ptr_t callback){ |
---|
1205 | frame_rx_callback = callback; |
---|
1206 | } |
---|
1207 | |
---|
1208 | inline void wlan_mac_low_set_sample_rate_change_callback(function_ptr_t callback){ |
---|
1209 | sample_rate_change_callback = callback; |
---|
1210 | } |
---|
1211 | |
---|
1212 | inline void wlan_mac_low_set_beacon_txrx_config_callback(function_ptr_t callback){ |
---|
1213 | beacon_txrx_config_callback = callback; |
---|
1214 | } |
---|
1215 | |
---|
1216 | inline void wlan_mac_low_set_mactime_change_callback(function_ptr_t callback){ |
---|
1217 | mactime_change_callback = callback; |
---|
1218 | } |
---|
1219 | |
---|
1220 | |
---|
1221 | /*****************************************************************************/ |
---|
1222 | /** |
---|
1223 | * @brief Set Frame Transmission Callback |
---|
1224 | * |
---|
1225 | * Tells the framework which function should be called when an MPDU is passed down from the |
---|
1226 | * upper-level MAC for wireless transmission |
---|
1227 | * |
---|
1228 | * @param callback - Pointer to callback function |
---|
1229 | * @return None |
---|
1230 | */ |
---|
1231 | inline void wlan_mac_low_set_frame_tx_callback(function_ptr_t callback){ |
---|
1232 | frame_tx_callback = callback; |
---|
1233 | } |
---|
1234 | |
---|
1235 | |
---|
1236 | |
---|
1237 | /*****************************************************************************/ |
---|
1238 | /** |
---|
1239 | * @brief Set IPC_MBOX_LOW_PARAM Callback |
---|
1240 | * |
---|
1241 | * Tells the framework which function should be called when an ipc message is received for |
---|
1242 | * the IPC_MBOX_LOW_PARAM command. |
---|
1243 | * |
---|
1244 | * @param callback - Pointer to callback function |
---|
1245 | * @return None |
---|
1246 | */ |
---|
1247 | void wlan_mac_low_set_ipc_low_param_callback(function_ptr_t callback){ |
---|
1248 | ipc_low_param_callback = callback; |
---|
1249 | } |
---|
1250 | |
---|
1251 | |
---|
1252 | |
---|
1253 | /*****************************************************************************/ |
---|
1254 | /** |
---|
1255 | * @brief Various Getter Methods |
---|
1256 | * |
---|
1257 | * These functions will get parameters from the low framework. |
---|
1258 | * |
---|
1259 | * @param None |
---|
1260 | * @return (see individual function) |
---|
1261 | */ |
---|
1262 | inline u32 wlan_mac_low_get_active_channel(){ |
---|
1263 | return mac_param_chan; |
---|
1264 | } |
---|
1265 | |
---|
1266 | |
---|
1267 | inline s8 wlan_mac_low_get_current_ctrl_tx_pow(){ |
---|
1268 | return mac_param_ctrl_tx_pow; |
---|
1269 | } |
---|
1270 | |
---|
1271 | |
---|
1272 | inline u32 wlan_mac_low_get_current_rx_filter(){ |
---|
1273 | return mac_param_rx_filter; |
---|
1274 | } |
---|
1275 | |
---|
1276 | |
---|
1277 | inline phy_samp_rate_t wlan_mac_low_get_phy_samp_rate() { |
---|
1278 | return gl_phy_samp_rate; |
---|
1279 | } |
---|
1280 | |
---|
1281 | |
---|
1282 | |
---|
1283 | /*****************************************************************************/ |
---|
1284 | /** |
---|
1285 | * @brief Get the Rx Start Microsecond Timestamp |
---|
1286 | * |
---|
1287 | * This function returns the Rx start timestamp of the system |
---|
1288 | * |
---|
1289 | * @param None |
---|
1290 | * @return u64 - microsecond timestamp |
---|
1291 | */ |
---|
1292 | inline u64 wlan_mac_low_get_rx_start_timestamp() { |
---|
1293 | u32 timestamp_high_u32; |
---|
1294 | u32 timestamp_low_u32; |
---|
1295 | u64 timestamp_u64; |
---|
1296 | |
---|
1297 | // RX_START timestamp is captured once per reception - no race condition between 32-bit reads |
---|
1298 | timestamp_high_u32 = Xil_In32(WLAN_MAC_REG_RX_TIMESTAMP_MSB); |
---|
1299 | timestamp_low_u32 = Xil_In32(WLAN_MAC_REG_RX_TIMESTAMP_LSB); |
---|
1300 | timestamp_u64 = (((u64)timestamp_high_u32)<<32) + ((u64)timestamp_low_u32); |
---|
1301 | |
---|
1302 | return timestamp_u64; |
---|
1303 | } |
---|
1304 | |
---|
1305 | |
---|
1306 | |
---|
1307 | /*****************************************************************************/ |
---|
1308 | /** |
---|
1309 | * @brief Get the Tx Start Microsecond Timestamp |
---|
1310 | * |
---|
1311 | * This function returns the Tx start timestamp of the system |
---|
1312 | * |
---|
1313 | * @param None |
---|
1314 | * @return u64 - microsecond timestamp |
---|
1315 | */ |
---|
1316 | inline u64 wlan_mac_low_get_tx_start_timestamp() { |
---|
1317 | |
---|
1318 | u32 timestamp_high_u32; |
---|
1319 | u32 timestamp_low_u32; |
---|
1320 | u64 timestamp_u64; |
---|
1321 | |
---|
1322 | // TX_START timestamp is captured once per transmission - no race condition between 32-bit reads |
---|
1323 | timestamp_high_u32 = Xil_In32(WLAN_MAC_REG_TX_TIMESTAMP_MSB); |
---|
1324 | timestamp_low_u32 = Xil_In32(WLAN_MAC_REG_TX_TIMESTAMP_LSB); |
---|
1325 | timestamp_u64 = (((u64)timestamp_high_u32)<<32) + ((u64)timestamp_low_u32); |
---|
1326 | |
---|
1327 | return timestamp_u64; |
---|
1328 | } |
---|
1329 | |
---|
1330 | |
---|
1331 | |
---|
1332 | /*****************************************************************************/ |
---|
1333 | /** |
---|
1334 | * @brief Various Setter Methods |
---|
1335 | * |
---|
1336 | * These functions will set parameters in the low framework. |
---|
1337 | * |
---|
1338 | * @param (see individual function) |
---|
1339 | * @return None |
---|
1340 | */ |
---|
1341 | void wlan_mac_low_set_nav_check_addr(u8* addr) { |
---|
1342 | Xil_Out32(WLAN_MAC_REG_NAV_CHECK_ADDR_1, *((u32*)&(addr[0])) ); |
---|
1343 | Xil_Out32(WLAN_MAC_REG_NAV_CHECK_ADDR_2, *((u32*)&(addr[4])) ); |
---|
1344 | } |
---|
1345 | |
---|
1346 | |
---|
1347 | |
---|
1348 | /*****************************************************************************/ |
---|
1349 | /** |
---|
1350 | * @brief Calculates Rx Power (in dBm) |
---|
1351 | * |
---|
1352 | * This function calculates receive power for a given band, RSSI and LNA gain. This |
---|
1353 | * provides a reasonable estimate of Rx power, accurate to a few dB for standard waveforms. |
---|
1354 | * |
---|
1355 | * This function does not use the VGA gain setting or I/Q magnitudes. The PHY should use these |
---|
1356 | * to refine its own power measurement if needed. |
---|
1357 | * |
---|
1358 | * NOTE: These lookup tables were developed as part of the RF characterization. See: |
---|
1359 | * http://warpproject.org/trac/wiki/802.11/Benchmarks/Rx_Char |
---|
1360 | * |
---|
1361 | * |
---|
1362 | * @param rssi - RSSI value from RF frontend |
---|
1363 | * @param lna_gain - Value of LNA gain stage in RF frontend |
---|
1364 | * @return int - Power in dBm |
---|
1365 | */ |
---|
1366 | const s8 pow_lookup_B24[128] = {-90, -90, -89, -88, -88, -87, -87, -86, -86, -85, -84, -84, -83, -83, -82, -82, |
---|
1367 | -81, -81, -80, -79, -79, -78, -78, -77, -77, -76, -75, -75, -74, -74, -73, -73, |
---|
1368 | -72, -72, -71, -70, -70, -69, -69, -68, -68, -67, -66, -66, -65, -65, -64, -64, |
---|
1369 | -63, -63, -62, -61, -61, -60, -60, -59, -59, -58, -58, -57, -56, -56, -55, -55, |
---|
1370 | -54, -54, -53, -52, -52, -51, -51, -50, -50, -49, -49, -48, -47, -47, -46, -46, |
---|
1371 | -45, -45, -44, -43, -43, -42, -42, -41, -41, -40, -40, -39, -38, -38, -37, -37, |
---|
1372 | -36, -36, -35, -34, -34, -33, -33, -32, -32, -31, -31, -30, -29, -29, -28, -28, |
---|
1373 | -27, -27, -26, -26, -25, -24, -24, -23, -23, -22, -22, -21, -20, -20, -19, -19}; |
---|
1374 | |
---|
1375 | const s8 pow_lookup_B5[128] = {-97, -97, -96, -96, -95, -94, -94, -93, -93, -92, -92, -91, -90, -90, -89, -89, |
---|
1376 | -88, -88, -87, -87, -86, -85, -85, -84, -84, -83, -83, -82, -81, -81, -80, -80, |
---|
1377 | -79, -79, -78, -78, -77, -76, -76, -75, -75, -74, -74, -73, -72, -72, -71, -71, |
---|
1378 | -70, -70, -69, -69, -68, -67, -67, -66, -66, -65, -65, -64, -63, -63, -62, -62, |
---|
1379 | -61, -61, -60, -60, -59, -58, -58, -57, -57, -56, -56, -55, -54, -54, -53, -53, |
---|
1380 | -52, -52, -51, -51, -50, -49, -49, -48, -48, -47, -47, -46, -45, -45, -44, -44, |
---|
1381 | -43, -43, -42, -42, -41, -40, -40, -39, -39, -38, -38, -37, -36, -36, -35, -35, |
---|
1382 | -34, -34, -33, -32, -32, -31, -31, -30, -30, -29, -29, -28, -27, -27, -26, -26}; |
---|
1383 | |
---|
1384 | |
---|
1385 | inline int wlan_mac_low_calculate_rx_power(u16 rssi, u8 lna_gain){ |
---|
1386 | |
---|
1387 | u8 band; |
---|
1388 | int power = -100; |
---|
1389 | u16 adj_rssi = 0; |
---|
1390 | |
---|
1391 | band = mac_param_band; |
---|
1392 | |
---|
1393 | if(band == RC_24GHZ){ |
---|
1394 | switch(lna_gain){ |
---|
1395 | case 0: |
---|
1396 | case 1: |
---|
1397 | // Low LNA Gain State |
---|
1398 | adj_rssi = rssi + (440 << PHY_RX_RSSI_SUM_LEN_BITS); |
---|
1399 | break; |
---|
1400 | |
---|
1401 | case 2: |
---|
1402 | // Medium LNA Gain State |
---|
1403 | adj_rssi = rssi + (220 << PHY_RX_RSSI_SUM_LEN_BITS); |
---|
1404 | break; |
---|
1405 | |
---|
1406 | case 3: |
---|
1407 | // High LNA Gain State |
---|
1408 | adj_rssi = rssi; |
---|
1409 | break; |
---|
1410 | } |
---|
1411 | |
---|
1412 | power = pow_lookup_B24[(adj_rssi >> (PHY_RX_RSSI_SUM_LEN_BITS+POW_LOOKUP_SHIFT))]; |
---|
1413 | |
---|
1414 | } else if(band == RC_5GHZ){ |
---|
1415 | switch(lna_gain){ |
---|
1416 | case 0: |
---|
1417 | case 1: |
---|
1418 | // Low LNA Gain State |
---|
1419 | adj_rssi = rssi + (540 << PHY_RX_RSSI_SUM_LEN_BITS); |
---|
1420 | break; |
---|
1421 | |
---|
1422 | case 2: |
---|
1423 | // Medium LNA Gain State |
---|
1424 | adj_rssi = rssi + (280 << PHY_RX_RSSI_SUM_LEN_BITS); |
---|
1425 | break; |
---|
1426 | |
---|
1427 | case 3: |
---|
1428 | // High LNA Gain State |
---|
1429 | adj_rssi = rssi; |
---|
1430 | break; |
---|
1431 | } |
---|
1432 | |
---|
1433 | power = pow_lookup_B5[(adj_rssi >> (PHY_RX_RSSI_SUM_LEN_BITS+POW_LOOKUP_SHIFT))]; |
---|
1434 | } |
---|
1435 | |
---|
1436 | return power; |
---|
1437 | } |
---|
1438 | |
---|
1439 | |
---|
1440 | |
---|
1441 | /*****************************************************************************/ |
---|
1442 | /** |
---|
1443 | * @brief Calculates RSSI from Rx power (in dBm) |
---|
1444 | * |
---|
1445 | * This function calculates receive power for a given band, RSSI and LNA gain. This |
---|
1446 | * provides a reasonable estimate of Rx power, accurate to a few dB for standard waveforms. |
---|
1447 | * |
---|
1448 | * This function does not use the VGA gain setting or I/Q magnitudes. The PHY should use these |
---|
1449 | * to refine its own power measurement if needed. |
---|
1450 | * |
---|
1451 | * NOTE: These lookup tables were developed as part of the RF characterization. See: |
---|
1452 | * http://warpproject.org/trac/wiki/802.11/Benchmarks/Rx_Char |
---|
1453 | * |
---|
1454 | * |
---|
1455 | * @param rx_pow - Receive power in dBm |
---|
1456 | * @return u16 - RSSI value |
---|
1457 | * |
---|
1458 | * @note rx_pow must be in the range [PKT_DET_MIN_POWER_MIN, PKT_DET_MIN_POWER_MAX] inclusive |
---|
1459 | */ |
---|
1460 | const u16 rssi_lookup_B24[61] = { 1, 16, 24, 40, 56, 72, 80, 96, 112, 128, 144, 152, 168, 184, 200, 208, |
---|
1461 | 224, 240, 256, 272, 280, 296, 312, 328, 336, 352, 368, 384, 400, 408, 424, 440, |
---|
1462 | 456, 472, 480, 496, 512, 528, 536, 552, 568, 584, 600, 608, 624, 640, 656, 664, |
---|
1463 | 680, 696, 712, 728, 736, 752, 768, 784, 792, 808, 824, 840, 856}; |
---|
1464 | |
---|
1465 | const u16 rssi_lookup_B5[61] = { 96, 112, 128, 144, 160, 168, 184, 200, 216, 224, 240, 256, 272, 288, 296, 312, |
---|
1466 | 328, 344, 352, 368, 384, 400, 416, 424, 440, 456, 472, 480, 496, 512, 528, 544, |
---|
1467 | 552, 568, 584, 600, 608, 624, 640, 656, 672, 680, 696, 712, 728, 736, 752, 768, |
---|
1468 | 784, 800, 808, 824, 840, 856, 864, 880, 896, 912, 920, 936, 952}; |
---|
1469 | |
---|
1470 | |
---|
1471 | int wlan_mac_low_rx_power_to_rssi(s8 rx_pow){ |
---|
1472 | u8 band; |
---|
1473 | u16 rssi_val = 0; |
---|
1474 | |
---|
1475 | band = mac_param_band; |
---|
1476 | |
---|
1477 | if ((rx_pow <= PKT_DET_MIN_POWER_MAX) && (rx_pow >= PKT_DET_MIN_POWER_MIN)) { |
---|
1478 | if(band == RC_24GHZ){ |
---|
1479 | rssi_val = rssi_lookup_B24[rx_pow-PKT_DET_MIN_POWER_MIN]; |
---|
1480 | } else if(band == RC_5GHZ){ |
---|
1481 | rssi_val = rssi_lookup_B5[rx_pow-PKT_DET_MIN_POWER_MIN]; |
---|
1482 | } |
---|
1483 | |
---|
1484 | return rssi_val; |
---|
1485 | |
---|
1486 | } else { |
---|
1487 | return -1; |
---|
1488 | } |
---|
1489 | } |
---|
1490 | |
---|
1491 | |
---|
1492 | |
---|
1493 | /*****************************************************************************/ |
---|
1494 | /** |
---|
1495 | * @brief Set the minimum power for packet detection |
---|
1496 | * |
---|
1497 | * @param rx_pow - Receive power in dBm |
---|
1498 | * @return int - Status: 0 - Success; -1 - Failure |
---|
1499 | */ |
---|
1500 | int wlan_mac_low_set_pkt_det_min_power(s8 rx_pow){ |
---|
1501 | int rssi_val; |
---|
1502 | |
---|
1503 | rssi_val = wlan_mac_low_rx_power_to_rssi(rx_pow); |
---|
1504 | |
---|
1505 | if(rssi_val != -1){ |
---|
1506 | wlan_phy_rx_pktDet_RSSI_cfg( (PHY_RX_RSSI_SUM_LEN-1), (rssi_val << PHY_RX_RSSI_SUM_LEN_BITS), 1); |
---|
1507 | |
---|
1508 | return 0; |
---|
1509 | } else { |
---|
1510 | return -1; |
---|
1511 | } |
---|
1512 | } |
---|
1513 | |
---|
1514 | |
---|
1515 | |
---|
1516 | /*****************************************************************************/ |
---|
1517 | /** |
---|
1518 | * @brief Search for and Lock Empty Packet Buffer (Blocking) |
---|
1519 | * |
---|
1520 | * This is a blocking function for finding and locking an empty rx packet buffer. The low framework |
---|
1521 | * calls this function after passing a new wireless reception up to CPU High for processing. CPU High |
---|
1522 | * must unlock Rx packet buffers after processing the received packet. This function loops over all Rx |
---|
1523 | * packet buffers until it finds one that has been unlocked by CPU High. |
---|
1524 | * |
---|
1525 | * By design this function prints a message if it fails to unlock the oldest packet buffer. When this |
---|
1526 | * occurs it indicates that CPU Low has outrun CPU High, a situation that leads to dropped wireless |
---|
1527 | * receptions with high probability. The node recovers gracefully from this condition and will |
---|
1528 | * continue processing new Rx events after CPU High catches up. But seeing this message in the UART |
---|
1529 | * for CPU Low is a strong indicator the CPU High code is not keeping up with wireless receptions. |
---|
1530 | * |
---|
1531 | * @param None |
---|
1532 | * @return None |
---|
1533 | * |
---|
1534 | * @note This function assumes it is called in the same context where rx_pkt_buf is still valid. |
---|
1535 | */ |
---|
1536 | inline void wlan_mac_low_lock_empty_rx_pkt_buf(){ |
---|
1537 | // This function blocks until it safely finds a packet buffer for the PHY RX to store a future reception |
---|
1538 | rx_frame_info_t* rx_frame_info; |
---|
1539 | u32 i = 1; |
---|
1540 | |
---|
1541 | while(1) { |
---|
1542 | //rx_pkt_buf is the global shared by all contexts which deal with wireless Rx |
---|
1543 | // Rx packet buffers are used in order. Thus incrementing rx_pkt_buf should |
---|
1544 | // select the "oldest" packet buffer, the one that is most likely to have already |
---|
1545 | // been processed and released by CPU High |
---|
1546 | rx_pkt_buf = (rx_pkt_buf+1) % NUM_RX_PKT_BUFS; |
---|
1547 | rx_frame_info = (rx_frame_info_t*) RX_PKT_BUF_TO_ADDR(rx_pkt_buf); |
---|
1548 | |
---|
1549 | if((rx_frame_info->rx_pkt_buf_state) == RX_PKT_BUF_LOW_CTRL){ |
---|
1550 | // By default Rx pkt buffers are not zeroed out, to save the performance penalty of bzero'ing 2KB |
---|
1551 | // However zeroing out the pkt buffer can be helpful when debugging Rx MAC/PHY behaviors |
---|
1552 | // bzero((void *)(RX_PKT_BUF_TO_ADDR(rx_pkt_buf)), 2048); |
---|
1553 | |
---|
1554 | // Set the OFDM and DSSS PHYs to use the same Rx pkt buffer |
---|
1555 | wlan_phy_rx_pkt_buf_ofdm(rx_pkt_buf); |
---|
1556 | wlan_phy_rx_pkt_buf_dsss(rx_pkt_buf); |
---|
1557 | |
---|
1558 | if (i > 1) { xil_printf("found in %d iterations.\n", i); } |
---|
1559 | |
---|
1560 | return; |
---|
1561 | |
---|
1562 | } |
---|
1563 | |
---|
1564 | if (i == 1) { xil_printf("Searching for empty packet buff ... "); } |
---|
1565 | i++; |
---|
1566 | } |
---|
1567 | } |
---|
1568 | |
---|
1569 | |
---|
1570 | /*****************************************************************************/ |
---|
1571 | /** |
---|
1572 | * @brief Finish PHY Reception |
---|
1573 | * |
---|
1574 | * This function polls the MAC status register until the Rx PHY goes idle. The |
---|
1575 | * return value indicates whether the just-completed reception was good |
---|
1576 | * (no Rx errors and matching checksum) or bad |
---|
1577 | * |
---|
1578 | * @param None |
---|
1579 | * @return u32 - FCS status (RX_MPDU_STATE_FCS_GOOD or RX_MPDU_STATE_FCS_BAD) |
---|
1580 | */ |
---|
1581 | inline u32 wlan_mac_hw_rx_finish() { |
---|
1582 | u32 mac_hw_status; |
---|
1583 | int i = 0; |
---|
1584 | |
---|
1585 | // Wait for the packet to finish |
---|
1586 | do{ |
---|
1587 | mac_hw_status = wlan_mac_get_status(); |
---|
1588 | if(i++>1000000) {xil_printf("Stuck in wlan_mac_hw_rx_finish! 0x%08x\n", mac_hw_status);} |
---|
1589 | } while(mac_hw_status & WLAN_MAC_STATUS_MASK_RX_PHY_ACTIVE); |
---|
1590 | |
---|
1591 | // Check RX_END_ERROR and FCS |
---|
1592 | if( (mac_hw_status & WLAN_MAC_STATUS_MASK_RX_FCS_GOOD) && |
---|
1593 | ((mac_hw_status & WLAN_MAC_STATUS_MASK_RX_END_ERROR) == 0)) { |
---|
1594 | return 1; |
---|
1595 | |
---|
1596 | } else { |
---|
1597 | return 0; |
---|
1598 | |
---|
1599 | } |
---|
1600 | } |
---|
1601 | |
---|
1602 | |
---|
1603 | |
---|
1604 | /*****************************************************************************/ |
---|
1605 | /** |
---|
1606 | * @brief Force reset backoff counter in MAC hardware |
---|
1607 | */ |
---|
1608 | inline void wlan_mac_reset_backoff_counter() { |
---|
1609 | Xil_Out32(WLAN_MAC_REG_CONTROL, Xil_In32(WLAN_MAC_REG_CONTROL) | WLAN_MAC_CTRL_MASK_RESET_A_BACKOFF); |
---|
1610 | Xil_Out32(WLAN_MAC_REG_CONTROL, Xil_In32(WLAN_MAC_REG_CONTROL) & ~WLAN_MAC_CTRL_MASK_RESET_A_BACKOFF); |
---|
1611 | } |
---|
1612 | |
---|
1613 | |
---|
1614 | |
---|
1615 | /*****************************************************************************/ |
---|
1616 | /** |
---|
1617 | * @brief Force reset NAV counter in MAC hardware |
---|
1618 | */ |
---|
1619 | inline void wlan_mac_reset_NAV_counter() { |
---|
1620 | Xil_Out32(WLAN_MAC_REG_CONTROL, Xil_In32(WLAN_MAC_REG_CONTROL) | WLAN_MAC_CTRL_MASK_RESET_NAV); |
---|
1621 | Xil_Out32(WLAN_MAC_REG_CONTROL, Xil_In32(WLAN_MAC_REG_CONTROL) & ~WLAN_MAC_CTRL_MASK_RESET_NAV); |
---|
1622 | } |
---|
1623 | |
---|
1624 | |
---|
1625 | |
---|
1626 | /*****************************************************************************/ |
---|
1627 | /** |
---|
1628 | * @brief Convert dBm to Tx Gain Target |
---|
1629 | * |
---|
1630 | * This function maps a transmit power (in dBm) to a radio gain target. |
---|
1631 | * |
---|
1632 | * @param s8 power - Power in dBm |
---|
1633 | * @return u8 gain_target - Gain target in range of [0,63] |
---|
1634 | */ |
---|
1635 | inline u8 wlan_mac_low_dbm_to_gain_target(s8 power){ |
---|
1636 | s8 power_railed; |
---|
1637 | u8 return_value; |
---|
1638 | |
---|
1639 | if(power > TX_POWER_MAX_DBM){ |
---|
1640 | power_railed = TX_POWER_MAX_DBM; |
---|
1641 | } else if( power < TX_POWER_MIN_DBM){ |
---|
1642 | power_railed = TX_POWER_MIN_DBM; |
---|
1643 | } else { |
---|
1644 | power_railed = power; |
---|
1645 | } |
---|
1646 | |
---|
1647 | // This is only save because 'power' is constrained to less than half the dynamic range of an s8 type |
---|
1648 | return_value = (u8)((power_railed << 1) + 20); |
---|
1649 | |
---|
1650 | return return_value; |
---|
1651 | } |
---|
1652 | |
---|
1653 | |
---|
1654 | |
---|
1655 | /*****************************************************************************/ |
---|
1656 | /** |
---|
1657 | * @brief Map the WLAN channel frequencies onto the convention used by the radio controller |
---|
1658 | */ |
---|
1659 | inline u32 wlan_mac_low_wlan_chan_to_rc_chan(u32 mac_channel) { |
---|
1660 | int return_value = 0; |
---|
1661 | |
---|
1662 | switch(mac_channel){ |
---|
1663 | // 2.4GHz channels |
---|
1664 | case 1: |
---|
1665 | case 2: |
---|
1666 | case 3: |
---|
1667 | case 4: |
---|
1668 | case 5: |
---|
1669 | case 6: |
---|
1670 | case 7: |
---|
1671 | case 8: |
---|
1672 | case 9: |
---|
1673 | case 10: |
---|
1674 | case 11: |
---|
1675 | return_value = mac_channel; |
---|
1676 | break; |
---|
1677 | // 5GHz channels |
---|
1678 | case 36: // 5180MHz |
---|
1679 | return_value = 1; |
---|
1680 | break; |
---|
1681 | case 40: // 5200MHz |
---|
1682 | return_value = 2; |
---|
1683 | break; |
---|
1684 | case 44: // 5220MHz |
---|
1685 | return_value = 3; |
---|
1686 | break; |
---|
1687 | case 48: // 5240MHz |
---|
1688 | return_value = 4; |
---|
1689 | break; |
---|
1690 | } |
---|
1691 | |
---|
1692 | return return_value; |
---|
1693 | } |
---|
1694 | |
---|
1695 | |
---|
1696 | |
---|
1697 | /*****************************************************************************/ |
---|
1698 | /** |
---|
1699 | * @brief Convert MCS to number of data bits per symbol |
---|
1700 | */ |
---|
1701 | inline u16 wlan_mac_low_mcs_to_n_dbps(u8 mcs, u8 phy_mode) { |
---|
1702 | |
---|
1703 | if(phy_mode == PHY_MODE_NONHT && mcs < (sizeof(mcs_to_n_dbps_nonht_lut)/sizeof(mcs_to_n_dbps_nonht_lut[0]))) { |
---|
1704 | return mcs_to_n_dbps_nonht_lut[mcs]; |
---|
1705 | } else if(phy_mode == PHY_MODE_HTMF && mcs < (sizeof(mcs_to_n_dbps_htmf_lut)/sizeof(mcs_to_n_dbps_htmf_lut[0]))) { |
---|
1706 | return mcs_to_n_dbps_htmf_lut[mcs]; |
---|
1707 | } else { |
---|
1708 | xil_printf("ERROR (wlan_mac_low_mcs_to_n_dbps): Invalid PHY_MODE (%d) or MCS (%d)\n", phy_mode, mcs); |
---|
1709 | return 1; // N_DBPS used as denominator, so better not return 0 |
---|
1710 | } |
---|
1711 | } |
---|
1712 | |
---|
1713 | |
---|
1714 | |
---|
1715 | /*****************************************************************************/ |
---|
1716 | /** |
---|
1717 | * @brief Convert MCS to Control Response MCS |
---|
1718 | */ |
---|
1719 | inline u8 wlan_mac_low_mcs_to_ctrl_resp_mcs(u8 mcs, u8 phy_mode){ |
---|
1720 | // Returns the fastest NON-HT half-rate MCS lower than the provided MCS and no larger that 24Mbps. |
---|
1721 | // Valid return values are [0, 2, 4] |
---|
1722 | u8 return_value = 0; |
---|
1723 | |
---|
1724 | if(phy_mode == PHY_MODE_NONHT){ |
---|
1725 | return_value = mcs; |
---|
1726 | if(return_value > 4){ return_value = 4; } |
---|
1727 | if(return_value % 2){ return_value--; } |
---|
1728 | } else if(phy_mode == PHY_MODE_HTMF) { |
---|
1729 | switch(mcs){ |
---|
1730 | default: |
---|
1731 | case 0: |
---|
1732 | return_value = 0; |
---|
1733 | break; |
---|
1734 | case 1: |
---|
1735 | return_value = 2; |
---|
1736 | break; |
---|
1737 | case 2: |
---|
1738 | return_value = 2; |
---|
1739 | break; |
---|
1740 | case 3: |
---|
1741 | case 4: |
---|
1742 | case 5: |
---|
1743 | case 6: |
---|
1744 | case 7: |
---|
1745 | return_value = 4; |
---|
1746 | break; |
---|
1747 | } |
---|
1748 | } |
---|
1749 | return return_value; |
---|
1750 | } |
---|
1751 | |
---|
1752 | inline u64 wlan_mac_low_get_unique_seq(){ |
---|
1753 | return unique_seq; |
---|
1754 | } |
---|
1755 | |
---|
1756 | inline void wlan_mac_low_set_unique_seq(u64 curr_unique_seq){ |
---|
1757 | unique_seq = curr_unique_seq; |
---|
1758 | } |
---|
1759 | |
---|
1760 | inline void wlan_mac_hw_clear_rx_started() { |
---|
1761 | wlan_mac_reset_rx_started(1); |
---|
1762 | wlan_mac_reset_rx_started(0); |
---|
1763 | |
---|
1764 | return; |
---|
1765 | } |
---|