Changes between Version 18 and Version 19 of 802.11/MAC/Support_HW

Timestamp:

Dec 14, 2016, 3:52:32 PM (8 years ago)

Author:

murphpo

Comment:

--

802.11/MAC/Support_HW

@@ -196 +196 @@
 }}}
 
+Finally the backoff counter for Tx Controller A can be paused from software via the code below. The backoff counter must be paused when another Tx controller with higher priority is started (i.e. when a Beacon Tx must occur while an MPDU Tx defers). 
+{{{#!c
+// Pause Tx Controller A backoff counter
+wlan_mac_pause_backoff_tx_ctrl_A(1);
+
+// Verify Tx A backoff is paused - must check after asserting Pause in case backoff just expired 
+u32 mac_tx_ctrl_status;
+
+mac_tx_ctrl_status = wlan_mac_get_tx_ctrl_status();
+if( ((mac_tx_ctrl_status & WLAN_MAC_TXCTRL_STATUS_MASK_TX_A_STATE) == WLAN_MAC_TXCTRL_STATUS_TX_A_STATE_DEFER) ||
+    ((mac_tx_ctrl_status & WLAN_MAC_TXCTRL_STATUS_MASK_TX_A_STATE) == WLAN_MAC_TXCTRL_STATUS_TX_A_STATE_IDLE) ) {
+
+        // Backoff paused successfully - handle higher-priority Tx here
+        ...
+        
+}
+
+// Resume Tx Controller A backoff counter
+wlan_mac_pause_backoff_tx_ctrl_A(0);
+}}}
+
+
 The Tx Controller A state machine is implemented as an m-code block in the {{{wlan_mac_hw}}} core. The m source code is in the repository at [browser:/ReferenceDesigns/w3_802.11/sysgen/wlan_mac_hw/mcode_blocks/mac_tx_ctrl_a_fsm.m mac_tx_ctrl_a_fsm.m]
 
@@ -403 +425 @@
 }}}
 
+Finally the backoff counter for Tx Controllers C and D can be paused from software via the code below. The backoff counter must be paused when another Tx controller with higher priority is started.
+{{{#!c
+// Code below pauses/checks/resumes Tx C backoff
+// Replace "C" with "D" in macros to control Tx D backoff
+
+// Pause Tx Controller C backoff counter
+wlan_mac_pause_backoff_tx_ctrl_C(1);
+
+// Verify Tx C backoff is paused - must check after asserting Pause in case backoff just expired 
+u32 mac_tx_ctrl_status;
+
+mac_tx_ctrl_status = wlan_mac_get_tx_ctrl_status();
+if( ((mac_tx_ctrl_status & WLAN_MAC_TXCTRL_STATUS_MASK_TX_C_STATE) == WLAN_MAC_TXCTRL_STATUS_TX_C_STATE_DEFER) ||
+    ((mac_tx_ctrl_status & WLAN_MAC_TXCTRL_STATUS_MASK_TX_C_STATE) == WLAN_MAC_TXCTRL_STATUS_TX_C_STATE_IDLE) ) {
+
+        // Backoff paused successfully - handle higher-priority Tx here
+        ...
+        
+}
+
+// Resume Tx Controller C backoff counter
+wlan_mac_pause_backoff_tx_ctrl_C(0);
+}}}
+
+
 The Tx Controller C/D state machine is implemented as an m-code block in the {{{wlan_mac_hw}}} core. The m source code is in the repository at [browser:/ReferenceDesigns/w3_802.11/sysgen/wlan_mac_hw/mcode_blocks/mac_tx_ctrl_cd_fsm.m mac_tx_ctrl_cd_fsm.m]