I've tried using the software serial libraries to provide a debug line, whilst keeping the usart for comms with an external gsm modem.
However, as soon as I can analogRead(n), the TX data on the debug line stops.
I've tried various software libraries, newSoftSerial, softSerial and it happens with all of them, so it must be something Iam doing wrong.
The ardino version is 0022, and it's a mega328 running at 8mhz on a sparkfun board.
Any ideas muchly appreciated.