ESP32 interupt from continuous 10 hertz 5mS low-going pulse, never triggers

Using Arduino Programming Questions
1 
const uint8_t InterruptPin = 4;
const uint8_t OutPin = 23;
void IRAM_ATTR function_ISR() {
  digitalWrite(OutPin,HIGH);
  delay(5);
  digitalWrite(OutPin,LOW);
}
void setup() {
  pinMode(OutPin,OUTPUT);
  pinMode(InterruptPin, INPUT_PULLUP);
  attachInterrupt(InterruptPin, function_ISR, FALLING); 
  digitalWrite(OutPin,LOW);
}
void loop() {
}

Can't get the above code to ever trigger. Any help would be great. Works with a button.
Here is the setup:

image
image1313×1103 108 KB

2 
pinMode(InterruptPin, INPUT);
3

A delay call inside an interrupt?

And shouldn't the attachInterrupt call use digitalPinToInterrupt?

attachInterrupt(digitalPinToInterrupt(InterruptPin), function_ISR, FALLING);

I haven't tried this, but how about something like:

const uint8_t InterruptPin = 4;
const uint8_t OutPin = 23;
void IRAM_ATTR function_ISR() {
  digitalWrite(OutPin, !digitalRead(InterruptPin));
}
void setup() {
  pinMode(OutPin,OUTPUT);
  pinMode(InterruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(InterruptPin), function_ISR, CHANGE); 
  digitalWrite(OutPin,LOW);
}
void loop() {
}
4

Thank you, I'll try it !!

5

Well, I tried and still no movement on the output. The attachInterrupt statement I used works with a button to pull it low.

6

I'll try that, I had the pull-up for the switch.

7

OK, I tied it, and it did not make a difference. Thanks though.

8

Well, I just tried my code on a FireBeetle32 and other than changing the output pin, it worked like a charm as it was.

1 Like
9

If you want to take a stab at kicking out delay(), pore over this --
https://randomnerdtutorials.com/esp32-pir-motion-sensor-interrupts-timers/

Are you confident that your external signal source is working as anticipated?

1 Like
10

It is perfect on the oscilloscope.

11

Well, Maybe I'll try a different Arduino. Thanks

12

Thank you everyone for your help.
I got it to work with a Wemos D1 Mini, not sure about the ESP32 issue.

13

This can be closed

14

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.