David Duffy (AVD) wrote:
> The receiver is powered all the time, but its output goes to an NPN
> transistor that has a pull-up to Vdd. There is code in the receive ISR
> to dump bad packets and synchronise, but it seems like the receiver is
> just not listening.

Did you check for framing error in the receive code and reset the UART
receiver if found?  A framing error can easily appear on power up.  Sloppy
UART code that doesn't check for and handle that will get hung as you
describe.


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