Merge branch 'feature/add_reset_reason' into 'master'

Add reset reason function

See merge request sdk/ESP8266_RTOS_SDK!651

components/esp8266/include/esp8266/rtc_register.h

@@ -0,0 +1,29 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// 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.
+
+#pragma once
+
+typedef enum {
+    NO_MEAN                =  0,
+    POWERON_RESET          =  1,    /**<1, Vbat power on reset*/
+    EXT_RESET              =  2,    /**<2, external system reset*/
+    SW_RESET               =  3,    /**<3, Software reset digital core*/
+    OWDT_RESET             =  4,    /**<4, Legacy watch dog reset digital core*/
+    DEEPSLEEP_RESET        =  5,    /**<5, Deep Sleep reset digital core*/
+    SDIO_RESET             =  6,    /**<6, Reset by SLC module, reset digital core*/
+} RESET_REASON;
+
+#define RTC_STORE0                  (REG_RTC_BASE + 0x30)
+#define RTC_STATE1                  (REG_RTC_BASE + 0x14)
+#define RTC_STATE2                  (REG_RTC_BASE + 0x18)

components/esp8266/include/esp_system.h

@@ -28,6 +28,24 @@ typedef enum {
     ESP_MAC_WIFI_SOFTAP,
 } esp_mac_type_t;
 
+
+/**
+ * @brief Reset reasons
+ */
+typedef enum {
+    ESP_RST_UNKNOWN = 0,    //!< Reset reason can not be determined
+    ESP_RST_POWERON,        //!< Reset due to power-on event
+    ESP_RST_EXT,            //!< Reset by external pin (not applicable for ESP8266)
+    ESP_RST_SW,             //!< Software reset via esp_restart
+    ESP_RST_PANIC,          //!< Software reset due to exception/panic
+    ESP_RST_INT_WDT,        //!< Reset (software or hardware) due to interrupt watchdog
+    ESP_RST_TASK_WDT,       //!< Reset due to task watchdog
+    ESP_RST_WDT,            //!< Reset due to other watchdogs
+    ESP_RST_DEEPSLEEP,      //!< Reset after exiting deep sleep mode
+    ESP_RST_BROWNOUT,       //!< Brownout reset (software or hardware)
+    ESP_RST_SDIO,           //!< Reset over SDIO
+} esp_reset_reason_t;
+
 /**
   * @brief  Set base MAC address with the MAC address which is stored in EFUSE or
   *         external storage e.g. flash and EEPROM.
@@ -123,6 +141,12 @@ void system_restore(void)  __attribute__ ((noreturn));
   */
 void esp_restart(void) __attribute__ ((noreturn));
 
+/**
+ * @brief  Get reason of last reset
+ * @return See description of esp_reset_reason_t for explanation of each value.
+ */
+esp_reset_reason_t esp_reset_reason(void);
+
 /**
   * @brief  Get the size of available heap.
   *

components/esp8266/include/internal/esp_system_internal.h

@@ -0,0 +1,53 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// 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.
+
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define RTC_SYS_RAM_SIZE            256
+
+/**
+ * The size of structure must not be larger than 256 bytes and all member varible must be uint32_t type
+ */
+struct _rtc_sys_info {
+    uint32_t        hint;   // software reset reason
+};
+
+extern struct _rtc_sys_info rtc_sys_info;
+
+/**
+ * @brief  Internal function to get SoC reset reason at system initialization
+ */
+void esp_reset_reason_init(void);
+
+/**
+ * @brief  Internal function to set reset reason hint
+ *
+ * The hint is used do distinguish different reset reasons when software reset
+ * is performed.
+ *
+ * The hint is stored in RTC store register, RTC_RESET_CAUSE_REG.
+ *
+ * @param hint  Desired esp_reset_reason_t value for the real reset reason
+ */
+void esp_reset_reason_set_hint(esp_reset_reason_t hint);
+
+#ifdef __cplusplus
+}
+#endif