Use AzureRTOS ThreadX

Core/Src/app.c

@@ -0,0 +1,13 @@
+#include "app.h"
+
+#include "stm32h7xx_hal.h"
+#include "tx_api.h"
+
+#include "main.h"
+
+void app_thread_entry(ULONG _) {
+  while (1) {
+    HAL_GPIO_TogglePin(STATUS1_GPIO_Port, STATUS1_Pin);
+    tx_thread_sleep(50);
+  }
+}