Add Time and TimerWDT examples

Author: me-no-dev

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();
+}

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
+}