Fred,
Fred,
At first, I did think that the TX line out of the STM32 was at fault and reported the symptoms in the other thread.? After Hans posted the way that the PTT actually works I went back and change to the Raspberry Pi and found that the TX line DID work.? So you were not incorrect, just not informed on the latest news on the other thread.
So I apologize for any confusion that I might have created.? In my defense, the total logic on how that line is set was not explained before.? It was after the explanation from Hans and the RPi test that I confirmed it was not an output pin failure.
Thank you for the suggestions.
73
Evan
AC9TU
