Add reset reason reference implementation STM32

targets/TARGET_STM/reset_reason.c

@@ -0,0 +1,59 @@
+#include "reset_reason_api.h"
+
+#ifdef DEVICE_RESET_REASON
+
+#include "device.h"
+
+reset_reason_t hal_reset_reason_get(void)
+{
+#ifdef RCC_FLAG_SFTRST
+    if (__HAL_RCC_GET_FLAG(RCC_FLAG_SFTRST)) {
+        return RESET_REASON_SOFTWARE;
+    }
+#endif
+
+#ifdef RCC_FLAG_BORRST
+    if (__HAL_RCC_GET_FLAG(RCC_FLAG_BORRST)) {
+        return RESET_REASON_BROWN_OUT;
+    }
+#endif
+
+#ifdef RCC_FLAG_PORRST
+    if (__HAL_RCC_GET_FLAG(RCC_FLAG_PORRST)) {
+        return RESET_REASON_POWER_ON;
+    }
+#endif
+
+#ifdef RCC_FLAG_PINRST
+    if (__HAL_RCC_GET_FLAG(RCC_FLAG_PINRST)) {
+        return RESET_REASON_PIN_RESET;
+    }
+#endif
+
+#ifdef RCC_FLAG_IWDGRST
+    if (__HAL_RCC_GET_FLAG(RCC_FLAG_IWDGRST)) {
+        return RESET_REASON_WATCHDOG;
+    }
+#endif
+
+#ifdef RCC_FLAG_WWDGRST
+    if (__HAL_RCC_GET_FLAG(RCC_FLAG_WWDGRST)) {
+        return RESET_REASON_WATCHDOG;
+    }
+#endif
+
+#ifdef RCC_FLAG_LPWRRST
+    if (__HAL_RCC_GET_FLAG(RCC_FLAG_LPWRRST)) {
+        return RESET_REASON_WAKE_LOW_POWER;
+    }
+#endif
+
+    return RESET_REASON_UNKNOWN;
+}
+
+void hal_reset_reason_clear(void)
+{
+    __HAL_RCC_CLEAR_RESET_FLAGS();
+}
+
+#endif // DEVICE_RESET_REASON

targets/targets.json

@@ -1748,6 +1748,7 @@
             "PORTIN",
             "PORTINOUT",
             "PORTOUT",
+            "RESET_REASON",
             "PWMOUT",
             "SERIAL",
             "SLEEP",