boards/nucleo32s: skip LED0 auto init by default

boards/nucleo32-common/include/gpio_params.h

@@ -31,11 +31,13 @@ extern "C" {
  */
 static const  saul_gpio_params_t saul_gpio_params[] =
 {
+#ifdef AUTO_INIT_LED0
     {
         .name = "LD3(green)",
         .pin = LED0_PIN,
         .mode = GPIO_OUT
     }
+#endif
 };
 
 #ifdef __cplusplus

boards/nucleo32-f031/board.c

@@ -28,6 +28,9 @@ void board_init(void)
     /* initialize the CPU */
     cpu_init();
 
-    /* initialize the boards LEDs */
+#ifdef AUTO_INIT_LED0
+    /* The LED pin is also used for SPI, so we enable it
+       only if explicitly wanted by the user */
     gpio_init(LED0_PIN, GPIO_OUT);
+#endif
 }

boards/nucleo32-f042/board.c

@@ -26,6 +26,9 @@ void board_init(void)
     /* initialize the CPU */
     cpu_init();
 
-    /* initialize the boards LEDs */
+#ifdef AUTO_INIT_LED0
+    /* The LED pin is also used for SPI, so we enable it
+       only if explicitly wanted by the user */
     gpio_init(LED0_PIN, GPIO_OUT);
+#endif
 }

boards/nucleo32-f303/board.c

@@ -26,6 +26,9 @@ void board_init(void)
     /* initialize the CPU */
     cpu_init();
 
-    /* initialize the boards LEDs */
+#ifdef AUTO_INIT_LED0
+    /* The LED pin is also used for SPI, so we enable it
+       only if explicitly wanted by the user */
     gpio_init(LED0_PIN, GPIO_OUT);
+#endif
 }

boards/nucleo32-l031/board.c

@@ -29,6 +29,9 @@ void board_init(void)
     /* initialize the boards LED */
     gpio_init(LED0_PIN, GPIO_OUT);
 
-    /* initialize the CPU */
-    cpu_init();
+#ifdef AUTO_INIT_LED0
+    /* The LED pin is also used for SPI, so we enable it
+       only if explicitly wanted by the user */
+    gpio_init(LED0_PIN, GPIO_OUT);
+#endif
 }