I have done a lot of embedded mpu work and I use a Saleae logic analyzer when debuging GPIO, A/D converters, timers, etc. Thought I'd suggest that, however I just looked up the price, and it has skyrocketed since I bought mine. I paid $139 US, today price is $699.
https://www.sparkfun.com/products/13196
Glad I bought it when I did.
Perhaps a used one can be found.
I have the the 8 channel one, so you can see eight signals at once, very handy.
https://www.sparkfun.com/products/13196
Glad I bought it when I did.
Perhaps a used one can be found.
I have the the 8 channel one, so you can see eight signals at once, very handy.