Add RepeatTimer example (#216)

This commit is contained in:
Martin Sloup 2017-02-17 14:55:07 +01:00 committed by Me No Dev
parent 95cb54cede
commit a83dd5f2b5

View File

@ -0,0 +1,60 @@
/*
Repeat timer example
This example shows how to use hardware timer in ESP32. The timer calls onTimer
function every second. The timer can be stopped with button attached to PIN 0
(IO0).
This example code is in the public domain.
*/
// Stop button is attached to PIN 0 (IO0)
#define BTN_STOP_ALARM 0
hw_timer_t * timer = NULL;
void onTimer(){
static unsigned int counter = 1;
Serial.print("onTimer no. ");
Serial.print(counter);
Serial.print(" at ");
Serial.print(millis());
Serial.println(" ms");
counter++;
}
void setup() {
Serial.begin(115200);
// Set BTN_STOP_ALARM to input mode
pinMode(BTN_STOP_ALARM, INPUT);
// Use 1st timer of 4 (counted from zero).
// Set 80 divider for prescaler (see ESP32 Technical Reference Manual for more
// info).
timer = timerBegin(0, 80, true);
// Attach onTimer function to our timer.
timerAttachInterrupt(timer, &onTimer, true);
// Set alarm to call onTimer function every second (value in microseconds).
// Repeat the alarm (third parameter)
timerAlarmWrite(timer, 1000000, true);
// Start an alarm
timerAlarmEnable(timer);
}
void loop() {
// If button is pressed
if (digitalRead(BTN_STOP_ALARM) == LOW) {
// If timer is still running
if (timer) {
// Stop and free timer
timerEnd(timer);
timer = NULL;
}
}
}