Add Time and TimerWDT examples

Author: me-no-dev

Diff for: libraries/ESP32/examples/Time/SimpleTime/SimpleTime.ino

@@ -0,0 +1,47 @@
+#include <WiFi.h>
+#include "time.h"
+
+const char* ssid       = "YOUR_SSID";
+const char* password   = "YOUR_PASS";
+
+const char* ntpServer = "pool.ntp.org";
+const long  gmtOffset_sec = 3600;
+const int   daylightOffset_sec = 3600;
+
+void printLocalTime()
+{
+  struct tm timeinfo;
+  if(!getLocalTime(&timeinfo)){
+    Serial.println("Failed to obtain time");
+    return;
+  }
+  Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
+}
+
+void setup()
+{
+  Serial.begin(115200);
+  
+  //connect to WiFi
+  Serial.printf("Connecting to %s ", ssid);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+      delay(500);
+      Serial.print(".");
+  }
+  Serial.println(" CONNECTED");
+  
+  //init and get the time
+  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
+  printLocalTime();
+
+  //disconnect WiFi as it's no longer needed
+  WiFi.disconnect(true);
+  WiFi.mode(WIFI_OFF);
+}
+
+void loop()
+{
+  delay(1000);
+  printLocalTime();
+}

Diff for: libraries/ESP32/examples/Timer/WatchdogTimer/WatchdogTimer.ino

@@ -0,0 +1,39 @@
+#include "esp_system.h"
+
+const int button = 0;         //gpio to use to trigger delay
+const int wdtTimeout = 3000;  //time in ms to trigger the watchdog
+hw_timer_t *timer = NULL;
+
+void IRAM_ATTR resetModule() {
+  ets_printf("reboot\n");
+  esp_restart_noos();
+}
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println("running setup");
+
+  pinMode(button, INPUT_PULLUP);                    //init control pin
+  timer = timerBegin(0, 80, true);                  //timer 0, div 80
+  timerAttachInterrupt(timer, &resetModule, true);  //attach callback
+  timerAlarmWrite(timer, wdtTimeout * 1000, false); //set time in us
+  timerAlarmEnable(timer);                          //enable interrupt
+}
+
+void loop() {
+  Serial.println("running main loop");
+
+  timerWrite(timer, 0); //reset timer (feed watchdog)
+  long loopTime = millis();
+  //while button is pressed, delay up to 3 seconds to trigger the timer
+  while (!digitalRead(button)) {
+    Serial.println("button pressed");
+    delay(500);
+  }
+  delay(1000); //simulate work
+  loopTime = millis() - loopTime;
+  
+  Serial.print("loop time is = ");
+  Serial.println(loopTime); //should be under 3000
+}