The answer, from o-marshmallow
(https://github.com/o-marshmallow) on the ESP32 IDF github:
About touch_pad_thresh, its goal is to modify the threshold at runtime, whereas touch_pad_config is used for initialization. It does more than setting the threshold.

https://github.com/espressif/esp-idf ...

Hi, what's the difference between touch_pad_config() and touch_pad_set_thresh()? They take the same parameters:

Hi,

I'm running a mix of Arduino and ESP32 native API code. The touchpad wakes the ESP32 from deep sleep by using esp_sleep_enable_touchpad_wakeup() . And then setup() (Arduino) is executed. It works. I need the mix because the wake must be on TOUCH_TRIGGER_ABOVE, which Arduino doesn't have, and I ...

hi, did you ever get a response for this? what are good parameters for touch_pad_get_meas_time() that would make current consumption low?


I did play with the measure timing and duty cycle and now have a responsive touch sensor on both inputs with only 10uA current.

May I ask what values you ...

hi, did you ever figure this out, interrupt on going from touch to non-touch?

Yes that is a good question how to get an interrupt when pad goes from touched to not-touched. Seems like SENS_TOUCH_OUT_SEL can be flipped but affects all pads not just one.

hi, is there a way to generate an interrupt on a touch *release*, i.e. only when the capacitance decreases by a certain amount? the only way i can do it now is to poll the sensor, which wastes battery power. i know an interrupt can be generated when the capacitance is increased by touching. i need ...

I got it to blink with the following. My LED is on RTC_GPIO6 (RTC_GPIO_OUT_DATA_S+6), same as GPIO25 (see https://www.programmersought.com/article/40455220487/ ). The code is taken from https://codingfield.com/en/2019/01/15/ulp-esp32-un-exemple-simple/ .
loop1:
WRITE_RTC_REG(RTC_GPIO_OUT_REG,RTC ...

Hi,

Is there any info on how much current touch pad reading draws and how long it takes? I need the ULP to wake every 4 secs and do a touch read (not a touch trigger).

Also any info on how much RTC ADC SAR consumes when used by the ADC, and how long it takes? i'm not finding this anywhere. the ...

hi, is there a sample using a .S file? the HULP example uses the C-macro library, which is hard to make work on Windows. Besides, I have other .s code already implemented. thanks!

try https://github.com/boarchuz/HULP/blob/m ... lp_touch.h
the library also has an example.