Rename GPIO variables

src/motor-control/src/server.c

@@ -30,6 +30,12 @@
 
 #define ERROR_MARGIN_NS 400000
 
+// See this to compute the GPIO number based on port and pin number:
+// https://olimex.wordpress.com/tag/gpio/
+
+#define GPIO_DIRECTION_NUMBER 192 // PG0
+#define GPIO_PULSE_NUMBER 193 // PG1
+
 // Structs
 
 enum TSNTask { RECV_PACKET_TASK, RTT_TASK, XDP_TASK };
@@ -66,10 +72,10 @@ static pthread_cond_t emit_signal_ts_received;
 
 static int interval_us;
 
-static int gpio86_fd;
-static int gpio84_fd;
-static int gpio86_state;
-static int gpio84_state;
+static int gpio_pulse_fd;
+static int gpio_direction_fd;
+static int gpio_pulse_state;
+static int gpio_direction_state;
 static int received_reverse_motor = 0;
 
 static void help(char *argv[]) {
@@ -122,13 +128,13 @@ static void *emit_signal_thread(void *p) {
     }
 
     if(reverse_motor) {
-      gpio84_state = toggle_gpio(gpio84_fd, gpio84_state);
+      gpio_direction_state = toggle_gpio(gpio_direction_fd, gpio_direction_state);
       reverse_motor = 0;
     }
     else {
-      gpio86_state = toggle_gpio(gpio86_fd, gpio86_state);
+      gpio_pulse_state = toggle_gpio(gpio_pulse_fd, gpio_pulse_state);
       usleep(3);
-      gpio86_state = toggle_gpio(gpio86_fd, gpio86_state);
+      gpio_pulse_state = toggle_gpio(gpio_pulse_fd, gpio_pulse_state);
     }
 
     clock_gettime(CLOCK_REALTIME, &current);
@@ -299,8 +305,8 @@ int main(int argc, char *argv[]) {
   pthread_mutex_init(&emit_signal_mutex, NULL);
   pthread_cond_init(&emit_signal_ts_received, NULL);
 
-  gpio86_state = enable_gpio(&gpio86_fd, 86);
-  gpio84_state = enable_gpio(&gpio84_fd, 84);
+  gpio_pulse_state = enable_gpio(&gpio_pulse_fd, GPIO_PULSE_NUMBER);
+  gpio_direction_state = enable_gpio(&gpio_direction_fd, GPIO_DIRECTION_NUMBER);
 
   create_thread(tsn_thread);
   create_thread(emit_signal_thread);