Touch panel "crashes" when issuing sleep command about infinitime HOT 4 CLOSED

I was sending the wrong value to the register (0x05 instead of 0x03). The pinetime wiki has been updated : https://wiki.pine64.org/index.php/PineTime#Touch_events.

Now, we can try to reimplement the SLEEP command as detailed in the wiki and see if it works.

from infinitime.

I know the ST7789V display supports sleep mode (I've implemented it myself in the upstream Zephyr driver), but you're saying that the touch controller has a sleep mode of its own? When the display is in sleep mode it has close to zero power consumption.

from infinitime.

The datasheet mentions this:

http://files.pine64.org/doc/datasheet/pinetime/CST816S%E6%95%B0%E6%8D%AE%E6%89%8B%E5%86%8CV1.1.pdf

4.5 Low Power Mode
The CST816S touch controller supports the following low-power modes:

Sleep mode: after the host sends a sleep command to the chip, the chip will immediately enter a deep sleep mode to achieve the lowest power consumption;
Through the Reset, the chip will wake up and enter a dynamic operating mode.

Standby mode: In this mode, the chip remains at a low frequency for a minimum scan to match a predefined wake-up gesture.

Translated with www.DeepL.com/Translator (free version)

So the behaviour you observed is "okay", i would say. Maybe only send this command when you go into sleep.
And when you wake up, trigger a reset and you are ready to go again.

Typical power consumption < 2.5mA in dynamic mode.
Typical power consumption < 10uA in standby mode.
Typical power consumption in sleep mode < 5uA;

from infinitime.

The correct sleep command has been implemented and works perfectly !

from infinitime.