1 | #include "xgpio.h" |
---|
2 | #include "xexception_l.h" |
---|
3 | #include "xintc.h" |
---|
4 | #include "warp_userio.h" |
---|
5 | #include "xparameters.h" |
---|
6 | |
---|
7 | //Shortcuts for constants in xparameters.h |
---|
8 | #define INTC_DEVICE_ID XPAR_XPS_INTC_0_DEVICE_ID |
---|
9 | #define USERIO_DEVICE_ID XPAR_USER_IO_DEVICE_ID |
---|
10 | #define USERIO_IRPT_ID XPAR_XPS_INTC_0_USER_IO_IP2INTC_IRPT_INTR |
---|
11 | |
---|
12 | //Instances of the GPIO and Intc drivers |
---|
13 | static XGpio GPIO_UserIO; |
---|
14 | static XIntc Intc; |
---|
15 | |
---|
16 | //Global variable for tracking active LED outputs |
---|
17 | static unsigned int LED_Outputs = 0; |
---|
18 | |
---|
19 | //Function prototypes |
---|
20 | unsigned char sevenSegmentMap(unsigned char x); |
---|
21 | void UserIO_InterruptHandler(void *InstancePtr); |
---|
22 | void callback_button_center(); |
---|
23 | void callback_button_right(); |
---|
24 | void callback_button_left(); |
---|
25 | void callback_button_up(); |
---|
26 | void callback_dipsw(unsigned char dipsw_state); |
---|
27 | |
---|
28 | int main(void) |
---|
29 | { |
---|
30 | XStatus Status; |
---|
31 | unsigned char ledDisp = 0; |
---|
32 | |
---|
33 | //Initialize the UserIO GPIO core |
---|
34 | Status = XGpio_Initialize(&GPIO_UserIO, USERIO_DEVICE_ID); |
---|
35 | |
---|
36 | //We use both channels in the GPIO core- one for inputs, one for outputs |
---|
37 | XGpio_SetDataDirection(&GPIO_UserIO, USERIO_CHAN_INPUTS, USERIO_MASK_INPUTS); |
---|
38 | XGpio_SetDataDirection(&GPIO_UserIO, USERIO_CHAN_OUTPUTS, 0); |
---|
39 | |
---|
40 | //Make sure the LEDs are all off by default |
---|
41 | XGpio_DiscreteClear(&GPIO_UserIO, USERIO_CHAN_OUTPUTS, USERIO_MASK_OUTPUTS); |
---|
42 | |
---|
43 | /****** START Interrupt Setup ********/ |
---|
44 | |
---|
45 | //Initailize the interrupt controller |
---|
46 | Status = XIntc_Initialize(&Intc, INTC_DEVICE_ID); |
---|
47 | if(Status) xil_printf("Intc Setup Error!\r\n"); |
---|
48 | |
---|
49 | //Assign the UserIO ISR; there is a single ISR for any GPIO interrupt event |
---|
50 | XIntc_Connect(&Intc, USERIO_IRPT_ID, (XInterruptHandler)UserIO_InterruptHandler, &GPIO_UserIO); |
---|
51 | |
---|
52 | //Configure & enable the GPIO interrupt output |
---|
53 | // The interrupt is only enabled for the GPIO input channel |
---|
54 | XGpio_InterruptEnable(&GPIO_UserIO, USERIO_CHAN_INPUTS); |
---|
55 | XGpio_InterruptGlobalEnable(&GPIO_UserIO); |
---|
56 | |
---|
57 | //Enable the UserIO interrupt in the interrupt controller |
---|
58 | XIntc_Enable(&Intc, USERIO_IRPT_ID); |
---|
59 | |
---|
60 | //Configure & enable the PPC interrupt input |
---|
61 | XExc_Init(); |
---|
62 | XExc_RegisterHandler(XEXC_ID_NON_CRITICAL_INT, (XExceptionHandler)XIntc_InterruptHandler, &Intc); |
---|
63 | XExc_mEnableExceptions(XEXC_NON_CRITICAL); |
---|
64 | |
---|
65 | //Finally start the interrupt controller |
---|
66 | XIntc_Start(&Intc, XIN_REAL_MODE); |
---|
67 | |
---|
68 | /****** END Interrupt Setup ********/ |
---|
69 | |
---|
70 | //Manually call the UserIO ISR once to store the initial value of the buttons/switches |
---|
71 | // This is especially important for applications where the value of the DIP switch means something at boot |
---|
72 | UserIO_InterruptHandler((void *)&GPIO_UserIO); |
---|
73 | |
---|
74 | while(1) |
---|
75 | { |
---|
76 | xil_printf("Displaying: %x\r\n", ledDisp); |
---|
77 | |
---|
78 | //Update the global variable we use to track which LED/segments are currently lit |
---|
79 | // The xps_gpio core doesn't allow outputs to be read from code, so we have to track this internally |
---|
80 | LED_Outputs = (USERIO_MAP_LEDS(ledDisp) | USERIO_MAP_DISPR(ledDisp) | USERIO_MAP_DISPL(ledDisp)); |
---|
81 | |
---|
82 | //Set the LEDs & hex displays |
---|
83 | XGpio_DiscreteSet(&GPIO_UserIO, USERIO_CHAN_OUTPUTS, LED_Outputs); |
---|
84 | |
---|
85 | usleep(600000); |
---|
86 | |
---|
87 | //Cycle the displays through [0x0,0xF] |
---|
88 | if(ledDisp == 15) |
---|
89 | ledDisp = 0; |
---|
90 | else |
---|
91 | ledDisp++; |
---|
92 | } |
---|
93 | |
---|
94 | return 0; |
---|
95 | |
---|
96 | } |
---|
97 | |
---|
98 | //Interrupt service routine for the single GPIO interrupt |
---|
99 | // This function decodes which input caused the interrupt and calls the appropriate callback |
---|
100 | void UserIO_InterruptHandler(void *InstancePtr) |
---|
101 | { |
---|
102 | xil_printf("UserIO ISR!"); |
---|
103 | |
---|
104 | static unsigned int previousAssertedInputs; |
---|
105 | unsigned int assertedInputs; |
---|
106 | unsigned int newAssertedInputs; |
---|
107 | |
---|
108 | //Re-interpret the generic input pointer as a GPIO driver instance |
---|
109 | XGpio *GpioPtr = (XGpio *)InstancePtr; |
---|
110 | |
---|
111 | //Disable the GPIO core's interrupt output |
---|
112 | XGpio_InterruptDisable(GpioPtr, USERIO_CHAN_INPUTS); |
---|
113 | |
---|
114 | //Read the GPIO inputs; each 1 is a currently-asserted input bit |
---|
115 | assertedInputs = XGpio_DiscreteRead(&GPIO_UserIO, USERIO_CHAN_INPUTS) & USERIO_MASK_INPUTS; |
---|
116 | |
---|
117 | //XOR the current active bits with the previously active bits |
---|
118 | newAssertedInputs = assertedInputs ^ previousAssertedInputs; |
---|
119 | previousAssertedInputs = assertedInputs; |
---|
120 | |
---|
121 | //Check whether push buttons or DIP switch triggered the interrupt |
---|
122 | // We assume a user callback per button, and another for the DIP switch |
---|
123 | if(newAssertedInputs & USERIO_MASK_PBC) callback_button_center(); |
---|
124 | if(newAssertedInputs & USERIO_MASK_PBR) callback_button_right(); |
---|
125 | if(newAssertedInputs & USERIO_MASK_PBL) callback_button_left(); |
---|
126 | if(newAssertedInputs & USERIO_MASK_PBU) callback_button_up(); |
---|
127 | if(newAssertedInputs & USERIO_MASK_DIPSW) callback_dipsw( USERIO_MAP_DIPSW(assertedInputs) ); |
---|
128 | |
---|
129 | //Clear, acknowledge and re-enable the GPIO interrupt output |
---|
130 | XGpio_InterruptClear(GpioPtr, USERIO_CHAN_INPUTS); |
---|
131 | XIntc_Acknowledge(&Intc, USERIO_IRPT_ID); |
---|
132 | XGpio_InterruptEnable(GpioPtr, USERIO_CHAN_INPUTS); |
---|
133 | |
---|
134 | return; |
---|
135 | } |
---|
136 | |
---|
137 | //Place holders for user-code callbacks |
---|
138 | void callback_button_center() |
---|
139 | { |
---|
140 | xil_printf("PB Center!\r\n"); |
---|
141 | return; |
---|
142 | } |
---|
143 | |
---|
144 | void callback_button_right() |
---|
145 | { |
---|
146 | xil_printf("PB Right!\r\n"); |
---|
147 | return; |
---|
148 | } |
---|
149 | |
---|
150 | void callback_button_left() |
---|
151 | { |
---|
152 | xil_printf("PB Left!\r\n"); |
---|
153 | return; |
---|
154 | } |
---|
155 | |
---|
156 | void callback_button_up() |
---|
157 | { |
---|
158 | xil_printf("PB Up!\r\n"); |
---|
159 | return; |
---|
160 | } |
---|
161 | |
---|
162 | void callback_dipsw(unsigned char dipsw_state) |
---|
163 | { |
---|
164 | xil_printf("DIP SW: 0x%04x\r\n", dipsw_state); |
---|
165 | return; |
---|
166 | } |
---|
167 | |
---|
168 | unsigned char sevenSegmentMap(unsigned char x) |
---|
169 | { |
---|
170 | switch(x) |
---|
171 | { |
---|
172 | case(0x0) : return 0x007E; |
---|
173 | case(0x1) : return 0x0030; |
---|
174 | case(0x2) : return 0x006D; |
---|
175 | case(0x3) : return 0x0079; |
---|
176 | case(0x4) : return 0x0033; |
---|
177 | case(0x5) : return 0x005B; |
---|
178 | case(0x6) : return 0x005F; |
---|
179 | case(0x7) : return 0x0070; |
---|
180 | case(0x8) : return 0x007F; |
---|
181 | case(0x9) : return 0x007B; |
---|
182 | |
---|
183 | case(0xA) : return 0x0077; |
---|
184 | case(0xB) : return 0x007F; |
---|
185 | case(0xC) : return 0x004E; |
---|
186 | case(0xD) : return 0x007E; |
---|
187 | case(0xE) : return 0x004F; |
---|
188 | case(0xF) : return 0x0047; |
---|
189 | default : return 0x0000; |
---|
190 | } |
---|
191 | } |
---|