Hello,
I am using GT911 Touch driver with NXP i.MX RT1176. I communicate with GT911 via I2C. I have 2.2k pull-up resistors on my SDA and SCL pins. RST and INT pins are directly connected to GT911. (Even if I remove the pull-up resistors, the problem below does not go away.) Baudrate : 100kHz
GT911 init process is completed successfully. There is no problem with the receive and send functions. There is a callback function to read data on the touch panel. This function is called 33 times per second. There is no problem with the first communications. But after a while, the SDA pin, which goes from high to low only after touching and then returns to high, is pulled to low and does not return to high again. During this process, the RST pin is always high. Although the INT pin remains high, it also remains low at the first touch after the SDA remains low. If I increase the baudrate from 100 kHz to 200, the time for the SDA pin to go low becomes longer and it works correctly for a longer time. How can I solve this problem? Or how can I understand the source of the problem? If you need different information, I can share it.
Yellow: SDA
Blue: INT (low position and pulse, it seems like green)
Green: CLK
Purple: RST
