chore: Initial commit (blinky)

app/src/CMakeLists.txt

@@ -0,0 +1,3 @@
+target_sources(${EXECUTABLE} PRIVATE
+	main.c
+)

app/src/main.c

@@ -0,0 +1,15 @@
+#include "main.h"
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4xx_hal_gpio.h"
+
+int my_main()
+{
+	while (1)
+	{
+		HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
+		HAL_Delay(500);
+	}
+
+	return 0;
+}