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stm32f10x rtc frequency measurement using internal timer

Question asked by morgan.christopher on Aug 13, 2014
Latest reply on Aug 18, 2014 by morgan.christopher

I'm following the procedure in AN2604 and trying to use an internal timer to measure the rtc frequency by looping back the rtc into a timer pin, in my case PA8 (Timer 1 channel 1), and then using PWM input capture mode.

I was wondering if anyone has tried to do this before and been successful with it. I'm looking at the stm32 standard peripheral library pwm input example and have implemented my code using that as a basis. I can paste here but really I'd like to know if the idea is feasible at all given a 72Mhz system clock and the ~512Hz rtc signal to measure.