Hi,
I have a very strange ADC issue which I am unable to find the root cause to. The symptom is as follows;
While performing ADC readings to ADC1 IN1 and ADC2 IN1 consecutively, the readings sometimes differ by more than 32 ADC counts. I perform this check as part of BIST. This only happens when at the same time a UART signal is coming in to USART3_RX (115kbps). To prove that the USART3_RX is causing the problem, I sever the connection or stop transmission (both produce the same result). The issue goes away and everything works fine.
What could be the issue? Is there something else I could do to mitigate this issue besides stopping the UART signal?
I have not been able to mitigate the issue so far. All my efforts so far to uncover the issue have not yielded any results.
I am aware that these 2 channels are essentially routed to the same pin and shared by the 2 ADCs so the readings should be identical if not very close.
