Hello! I am working on a project using the STM32H747 dualcore. The M4 core is responsible among other tasks for sampling a fairly quick digital signal (5-10 Mhz). I am looking for a hardware interface on the H7 that will allow me to sample this signal.

[yuri CH]

the sampling logic and countig is not very standard:

1)     If A = rising edge and B = 0, counter++

2)     If A = falling edge and B = 1, counter++

3)     If B = rising edge and A = 1, counter++

4)     If B = falling edge and A = 0, counter++

5)     If A = falling edge and B = 0, counter--

6)     If A = rising edge and B = 1, counter--

7)     If B = rising edge and A = 0, counter--

😎     If B = falling edge and A = 1, counter-- 

Since the M4 core is doing other things during the sampling i do not want to use interrupts as the solution to this problem.

Please help me understand wether this is possible using some king of HW interface (perhaps timer?)