Added getResetReason in human readable form

Author: hallard

cores/esp8266/Esp.cpp

@@ -329,6 +329,28 @@ bool EspClass::checkFlashConfig(bool needsEquals) {
     return false;
 }
 
+String EspClass::getResetReason(void) {
+    char buff[32];
+    if (resetInfo.reason == REASON_DEFAULT_RST) { // normal startup by power on 
+      strcpy_P(buff, PSTR("Power on"));
+    } else if (resetInfo.reason == REASON_WDT_RST) { // hardware watch dog reset
+      strcpy_P(buff, PSTR("Hardware Watchdog"));
+    } else if (resetInfo.reason == REASON_EXCEPTION_RST) { // exception reset, GPIO status won’t change 
+      strcpy_P(buff, PSTR("Exception"));
+    } else if (resetInfo.reason == REASON_SOFT_WDT_RST) { // software watch dog reset, GPIO status won’t change 
+      strcpy_P(buff, PSTR("Software Watchdog"));
+    } else if (resetInfo.reason == REASON_SOFT_RESTART) { // software restart ,system_restart , GPIO status won’t change 
+      strcpy_P(buff, PSTR("Software/System restart"));
+    } else if (resetInfo.reason == REASON_DEEP_SLEEP_AWAKE) { // wake up from deep-sleep 
+      strcpy_P(buff, PSTR("Deep-Sleep Wake"));
+    } else if (resetInfo.reason == REASON_EXT_SYS_RST) { // external system reset 
+      strcpy_P(buff, PSTR("External System"));
+    } else {
+      strcpy_P(buff, PSTR("Unknown"));
+    }
+    return String(buff);
+}
+
 String EspClass::getResetInfo(void) {
     if(resetInfo.reason != 0) {
         char buff[200];

cores/esp8266/Esp.h

@@ -131,6 +131,7 @@ class EspClass {
         uint32_t getFreeSketchSpace();
         bool updateSketch(Stream& in, uint32_t size, bool restartOnFail = false, bool restartOnSuccess = true);
 
+        String getResetReason();
         String getResetInfo();
         struct rst_info * getResetInfoPtr();