Disable Timer within Timer ISR

[blengerich]

Is it possible to disable a timer within the timer ISR itself? I want to disable the timer interrupt when a certain condition is met, which can be determined within the timer ISR itself. I wrote an example program which works for Arduino Uno and Mega, but not for ESP32. In the code below, the timer interrupt continues to occur, even though I disable it. To get it to work for the ESP32, I set a flag in the interrupt routine when I want to disable The main code checks this flag, and disables the timer if the flag is set. Is there a more efficient way of doing this?

Code: [Select all] [Expand/Collapse]

1. hw_timer_t * timer = NULL;
2. int counter = 10;
3.  
4. void setup() {
5.   Serial.begin(115200);
6.    
7.   timer = timerBegin(2, 80, true);
8.   timerAttachInterrupt(timer, &onTimer, true);
9.   timerAlarmWrite(timer, 500000, true);  // Interrupt occurs every 500ms
10.   timerAlarmEnable(timer);
11. }
12.  
13. void loop() {
14.   Serial.println(counter);
15.   delay(100);
16. }
17.  
18. void onTimer() {
19.   if (counter == 0) {
20.     timerAlarmDisable(timer);
21.   } else {
22.     counter = counter - 1;
23.   }
24. }

GeSHi © Codebox Plus Extension