frankqt
Member level 4
We use STM32F2 at work, I recently face with a strange problem. I do not expect a direct answer from the crowd but I hope some pointers where to look at for root cause.
I have a clock that is 1MHz in frequency, the clock works well except a shadow frequency behind. 40KHz (something between 40 to 42KHz to be exact, I couldn't pin point). It seems a clock is drifting in some direction, these timers are implemented as counters and I cannot think of a scenario why I would see something in the background.
(I noticed problem in ADC reading first, so I know it is not a scope issue)
I have a clock that is 1MHz in frequency, the clock works well except a shadow frequency behind. 40KHz (something between 40 to 42KHz to be exact, I couldn't pin point). It seems a clock is drifting in some direction, these timers are implemented as counters and I cannot think of a scenario why I would see something in the background.
(I noticed problem in ADC reading first, so I know it is not a scope issue)
