BRT Community

Quote from: BRT Community on February 04, 2020, 01:56:59 PM
Hello,

Do you know which touch controllers your displays are using?

To perform the Hycon clock stretching fix for the BT81x, it is necessary to load a file to the touch engine for BT81x, please see below:

At least the 5" uses a EXC80h32 Controller, Manufacturer is eGalax. The 7" looks the same but I can't read something on the chip.

I did load this file but it didn't change anything. Is this file supposed to change the I2C Clock speed as well or only activate clock streching ?

Hi,
did anybody get a touch controller working with this HYCON FIX BT81X  hack ?

I have a BT815 (with ESP32 controller) and two different Hyline touches (5,0" and 7,0"). I found that I2C Adress is 0x2A.
Without the hack I get sometimes good Y-coordinates but just random X-Value. I can see on the scope that the I2C relply from the touch controller ends after some bytes, so I guessed clock speed is too fast. I measured 340kHz without hack.
I tried to write the HYCON FIX blog from above into the RAM_JTBOOT (0x30b000) but this didn't change anything. I2C clock speed is still the same. Shouldn't this be slower after the hack ?