Add implementation of reset reason on Silicon Labs parts

targets/TARGET_Silicon_Labs/TARGET_EFM32/resetreason_api.c

@@ -0,0 +1,132 @@
+/***************************************************************************//**
+ * @file resetreason_api.c
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2018 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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 "device.h"
+#include "reset_reason_api.h"
+
+#if DEVICE_RESET_REASON
+
+#include "em_rmu.h"
+
+reset_reason_t hal_reset_reason_get(void)
+{
+	uint32_t reasonmask = RMU_ResetCauseGet();
+
+	/* Only care about the upper bit, since that is 'most significant' reset reason */
+	reasonmask = 1 << (31 - __CLZ(reasonmask));
+
+	if (reasonmask & RMU_RSTCAUSE_PORST) {
+		return RESET_REASON_POWER_ON;
+	}
+#if defined(RMU_RSTCAUSE_BODUNREGRST)
+	if (reasonmask & RMU_RSTCAUSE_BODUNREGRST) {
+		return RESET_REASON_BROWN_OUT;
+	}
+#endif
+#if defined(RMU_RSTCAUSE_BODREGRST)
+	if (reasonmask & RMU_RSTCAUSE_BODREGRST) {
+		return RESET_REASON_BROWN_OUT;
+	}
+#endif
+#if defined(RMU_RSTCAUSE_AVDDBOD)
+	if (reasonmask & RMU_RSTCAUSE_AVDDBOD) {
+		return RESET_REASON_BROWN_OUT;
+	}
+#endif
+#if defined(RMU_RSTCAUSE_DVDDBOD)
+	if (reasonmask & RMU_RSTCAUSE_DVDDBOD) {
+		return RESET_REASON_BROWN_OUT;
+	}
+#endif
+#if defined(RMU_RSTCAUSE_DECBOD)
+	if (reasonmask & RMU_RSTCAUSE_DECBOD) {
+		return RESET_REASON_BROWN_OUT;
+	}
+#endif
+	if (reasonmask & RMU_RSTCAUSE_EXTRST) {
+		return RESET_REASON_PIN_RESET;
+	}
+	if (reasonmask & RMU_RSTCAUSE_WDOGRST) {
+		return RESET_REASON_WATCHDOG;
+	}
+	if (reasonmask & RMU_RSTCAUSE_LOCKUPRST) {
+		return RESET_REASON_LOCKUP;
+	}
+	if (reasonmask & RMU_RSTCAUSE_SYSREQRST) {
+		return RESET_REASON_SOFTWARE;
+	}
+#if defined(RMU_RSTCAUSE_EM4RST)
+	if (reasonmask & RMU_RSTCAUSE_EM4RST) {
+		return RESET_REASON_WAKE_LOW_POWER;
+	}
+#endif
+#if defined(RMU_RSTCAUSE_EM4WURST)
+	if (reasonmask & RMU_RSTCAUSE_EM4WURST) {
+		return RESET_REASON_WAKE_LOW_POWER;
+	}
+#endif
+#if defined(RMU_RSTCAUSE_BODAVDD0)
+	if (reasonmask & RMU_RSTCAUSE_BODAVDD0) {
+		return RESET_REASON_BROWN_OUT;
+	}
+#endif
+#if defined(RMU_RSTCAUSE_BODAVDD1)
+	if (reasonmask & RMU_RSTCAUSE_BODAVDD1) {
+		return RESET_REASON_BROWN_OUT;
+	}
+#endif
+#if defined(BU_PRESENT) && defined(_SILICON_LABS_32B_SERIES_0)
+	if (reasonmask & RMU_RSTCAUSE_BUBODVDDDREG) {
+		return RESET_REASON_BROWN_OUT;
+	}
+	if (reasonmask & RMU_RSTCAUSE_BUBODBUVIN) {
+		return RESET_REASON_BROWN_OUT;
+	}
+	if (reasonmask & RMU_RSTCAUSE_BUBODUNREG) {
+		return RESET_REASON_BROWN_OUT;
+	}
+	if (reasonmask & RMU_RSTCAUSE_BUBODREG) {
+		return RESET_REASON_BROWN_OUT;
+	}
+	if (reasonmask & RMU_RSTCAUSE_BUMODERST) {
+		return RESET_REASON_PLATFORM;
+	}
+#elif defined(RMU_RSTCAUSE_BUMODERST)
+	if (reasonmask & RMU_RSTCAUSE_BUMODERST) {
+		return RESET_REASON_PLATFORM;
+	}
+#endif
+	return RESET_REASON_UNKNOWN;
+}
+
+uint32_t hal_reset_reason_get_raw(void)
+{
+	return RMU->RSTCAUSE;
+}
+
+void hal_reset_reason_clear(void)
+{
+	RMU_ResetCauseClear();
+}
+
+#endif /* DEVICE_RESET_REASON */

targets/targets.json

@@ -5803,6 +5803,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "RTC",
             "SERIAL",
             "SERIAL_ASYNCH",
@@ -5881,6 +5882,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "RTC",
             "SERIAL",
             "SERIAL_ASYNCH",
@@ -5960,6 +5962,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "RTC",
             "SERIAL",
             "SERIAL_ASYNCH",
@@ -6037,6 +6040,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "SERIAL",
             "SERIAL_ASYNCH",
             "SLEEP",
@@ -6111,6 +6115,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "SERIAL",
             "SERIAL_ASYNCH",
             "SLEEP",
@@ -6185,6 +6190,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "RTC",
             "SERIAL",
             "SERIAL_ASYNCH",
@@ -6285,6 +6291,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "RTC",
             "SERIAL",
             "SERIAL_ASYNCH",
@@ -6356,6 +6363,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "RTC",
             "SERIAL",
             "SERIAL_ASYNCH",
@@ -6434,6 +6442,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "RTC",
             "SERIAL",
             "SERIAL_ASYNCH",
@@ -6523,6 +6532,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "RTC",
             "SERIAL",
             "SERIAL_ASYNCH",