platformio-espressif32-sunton
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rzeldent
[ESP32-2432S024C] uses CST820 instead of CST816 and the INT GPIO is different
Hi. I recently bought an ESP32-2432S024C, and can confirm that there are some changes regarding board definition: https://github.com/rzeldent/platformio-espressif32-sunton/blob/main/esp32-2432S024C.json
- The touch sensor is a CST820 instead of
"'-D TOUCH_CST816S_I2C'" - The Interrupt GPIO is 22 instead of
"'-D CST816S_TOUCH_CONFIG_INT_GPIO_NUM=21'"
I tested it with https://esphome.io/components/touchscreen/cst816.html and works as expected.
Hi Regystro,
Thanks for going into the depths of the smartdisplay library!
It is very well possible the sensor is a CST820. The library CST816S is upwards compatible so supports this touch screen chip. Making a new library for the same functionality is not worth the effort so will stick with this module.
The INT GPIO is not used; it is polled by LVGL. So this is not much of an issue but the definitions should be correct!
I checked the schematic:
And it seems to be 21. Where did you find this information or did you measure/followed the tracks it on your board?
Kind regards,
Rene
P.S. Made a note about the driver in the documentation
Hi Rene.
Regarding the INT GPIO, I have the same schematics and even the sample code uses GPIO21. Anyway, trying to get it to work with ESPHome -which can use interrupts and also polling- I found that disabling polling, only GPIO22 detects interrupts. It was a matter of trial an error. GPIO22 shows touch in the logs, while GPIO21 doesn't.
It could be a mismatch in ESPHome's GPIO assignation though :)
Regards.
It is very well possible this this the case and they a really good find...
How can I reproduce this? Is there a little demo app to check for the INT
I digged deeper and found that even setting an interrupt pin in ESPHome, which as per the documentation should stop using the polling method (= update_interval: never), with CST820 it's not working.
Long story short: I thought I was using interrupts while the code was using polling. I filled an issue to see if ESPHome developers can fix it: https://github.com/esphome/issues/issues/5708
Okay, thanks for looking into this issue... So might be correct after all...
Hello, i am working on the same display, only programming on arduino and i cant get that touch to work, could you help me?
Hello, the driver for CST820 is very simple, unfortunately I haven't found a complete datasheet to know how to activate the Interrupt pin (which is an output and must be read from a microcontroller input).
I found the driver for a 2.4 inch display, and it is available in this repository:
https://github.com/rtek1000/2.4inch_ESP32-2432S024
