ADS1299EEGFE-PDK: ADS1299EEGFE-PDK

Tool/software:

Hi,

I use STM32 to control ADS1299EVM. I want to use the internal square wave test function to test it. I successfully get the signal, but the waveform does not look uniform (the positive and negative periods of the square wave are not equal), and there is a certain offset, and the midpoint is not at 0. Why is this? I attached the image I acquired via matlab.

I attached the register values ​​I wrote.

Regards,

Junzhe