LPC1768 Reset Reason implementation

Author: chrissnow

targets/TARGET_NXP/TARGET_LPC176X/reset_reason.c

@@ -0,0 +1,62 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2017 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "reset_reason_api.h"
+
+#ifdef DEVICE_RESET_REASON
+
+#include "device.h"
+
+reset_reason_t hal_reset_reason_get(void)
+{
+    if (LPC_SC->RSID & (1<<0)) {
+        return RESET_REASON_POWER_ON;
+    }
+
+    if (LPC_SC->RSID & (1<<1)) {
+        return RESET_REASON_PIN_RESET;
+    }
+    if (LPC_SC->RSID & (1<<2)) {
+        return RESET_REASON_WATCHDOG;
+    }
+
+    if (LPC_SC->RSID & (1<<3)) {
+        return RESET_REASON_BROWN_OUT;
+    }
+    if (LPC_SC->RSID & (1<<4)) {
+        return RESET_REASON_SOFTWARE;
+    }
+
+    if (LPC_SC->RSID & (1<<5)) {
+        return RESET_REASON_LOCKUP;
+    }
+
+    return RESET_REASON_UNKNOWN;
+}
+
+
+uint32_t hal_reset_reason_get_raw(void)
+{
+
+    return LPC_SC->RSID;
+}
+
+
+void hal_reset_reason_clear(void)
+{
+    LPC_SC->RSID = 0xff;              // Clear flags
+}
+
+#endif // DEVICE_RESET_REASON

targets/targets.json

@@ -625,7 +625,8 @@
             "FLASH",
             "MPU",
             "USBDEVICE",
-            "WATCHDOG"
+            "WATCHDOG",
+            "RESET_REASON"
         ],
         "release_versions": ["2", "5"],
         "device_name": "LPC1768",