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