Example: ResetReason2 (#8105)

* Create ResetReason2.ino

* Separate Reset Examples

Moved examples to separate sub folders

Author: mrengineer7777

libraries/ESP32/examples/ResetReason/ResetReason.ino libraries/ESP32/examples/ResetReason/ResetReason/ResetReason.ino

@@ -0,0 +1,64 @@
+//----------------------------------------------------------------------------------
+//  ResetReason2.ino
+//
+//  Prints last reset reason of ESP32
+//  This uses the mechanism in IDF that persists crash reasons across a reset.
+//  See https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/misc_system_api.html#software-reset
+//
+//  This example uses esp_reset_reason() instead of rtc_get_reset_reason(0).
+//  This example forces a WDT timeout in 10s.
+//
+//  Note enableLoopWDT() cannot be used here because it also takes care of
+//  resetting WDT.  See cores/esp32/main.cpp::loopTask().
+//
+//  Author: David McCurley
+//  Public Domain License
+//----------------------------------------------------------------------------------
+//  2023.04.21 r1.0 Initial release
+//----------------------------------------------------------------------------------
+
+#include "esp_task_wdt.h"
+
+//Converts reason type to a C string.
+//Type is located in /tools/sdk/esp32/include/esp_system/include/esp_system.h
+const char * resetReasonName(esp_reset_reason_t r) {
+  switch(r) {
+    case ESP_RST_UNKNOWN: return "Unknown";
+    case ESP_RST_POWERON: return "PowerOn";     //Power on or RST pin toggled
+    case ESP_RST_EXT: return "ExtPin";          //External pin - not applicable for ESP32
+    case ESP_RST_SW: return "Reboot";           //esp_restart()
+    case ESP_RST_PANIC: return "Crash";         //Exception/panic
+    case ESP_RST_INT_WDT: return "WDT_Int";     //Interrupt watchdog (software or hardware)
+    case ESP_RST_TASK_WDT: return "WDT_Task";   //Task watchdog
+    case ESP_RST_WDT: return "WDT_Other";       //Other watchdog
+    case ESP_RST_DEEPSLEEP: return "Sleep";     //Reset after exiting deep sleep mode
+    case ESP_RST_BROWNOUT: return "BrownOut";   //Brownout reset (software or hardware)
+    case ESP_RST_SDIO: return "SDIO";           //Reset over SDIO
+    default: return "";
+  }
+}
+
+void PrintResetReason(void) {
+  esp_reset_reason_t r = esp_reset_reason();
+  if(r==ESP_RST_POWERON) {
+    delay(6000);                                //Wait for serial monitor to connect
+  }
+  Serial.printf("\r\nReset reason %i - %s\r\n", r, resetReasonName(r));
+}
+
+void setup() {
+  Serial.begin(115200);
+  PrintResetReason();
+
+  //Start WDT monitor
+  if(esp_task_wdt_add(NULL) != ESP_OK) {
+    log_e("Failed to add current task to WDT");
+  }
+}
+
+//Enable esp_task_wdt_reset() below to prevent a WDT reset
+void loop() {
+  Serial.printf("Alive %lums\r\n", millis());
+  //esp_task_wdt_reset();
+  delay(1000);                                  //1s delay
+}