boards/stm32f746g-disco: add LD1 as LED0 definition

LED LD1 has no special function on the board STM32F746-DISCO and therefore can be used freely. This LED is also defined as ARDUINO LED pin D13 in the schematic.

boards/stm32f746g-disco/include/board.h

@@ -57,6 +57,14 @@ extern "C" {
 #define LCD_SCREEN_HEIGHT       272     /**< LCD screen height */
 /** @} */
 
+/**
+ * @name Macros for controlling the on-board LEDs.
+ * @{
+ */
+#define LED0_PIN_NUM        1           /**< LD1 pin number */
+#define LED0_PORT_NUM       PORT_I      /**< LD1 port */
+/** @} */
+
 /**
  * @name User button
  * @{
@@ -80,5 +88,7 @@ extern "C" {
 }
 #endif
 
+#include "stm32_leds.h"
+
 #endif /* BOARD_H */
 /** @} */

boards/stm32f746g-disco/include/gpio_params.h

@@ -31,6 +31,11 @@ extern "C" {
  */
 static const  saul_gpio_params_t saul_gpio_params[] =
 {
+    {
+        .name = "LD1 (green)",
+        .pin = LED0_PIN,
+        .mode = GPIO_OUT
+    },
     {
         .name = "BTN USER",
         .pin  = BTN0_PIN,