Touch Interrupt on GPIO36 with Inkplate 6 Plus

[claria]

Hi,

this is less a bug report but a info for people having the same problem as I had.

I tried to use GPIO36 as interrupt for touch detection instead of polling all the time, since i am using multiple tasks:

attachInterrupt(GPIO_NUM_36, touch_pressed, FALLING);

However i had many, many ISR function calls triggered without touching anything. While investigating the issue i found the following bug reports from ESP-IDF link and link.

When i called adc_power_acquire() before attaching the interrupt everything worked (ISR was called twice however). So in the end i used something like this which works perfectly:

void touch_pressed() {
    static unsigned long last_interrupt_time = 0;
    unsigned long interrupt_time = millis();
    // If interrupts come faster than 200ms, assume it's a bounce and ignore
    if (interrupt_time - last_interrupt_time > 200) {
        // do stuff like notifying a task or so
        last_interrupt_time = interrupt_time;
    }
}

[claria]

Closing it directly since it is no bug, but maybe helpful to another person.