Serial port problem

floydes · 10-14-2004, 10:27 AM

Sorry to bother, but i have the following problem. I'm trying to implement
AFSK modem 2400 baud rate, through serial port. That is serial flow is generated on the fly to AFSK signal in soundcard. I have dropouts. The question is how to make it smooth ? Is multithreaded proccess will help(one for read from serial port, one for streaming to sound card ) ?

Any suggestions are appreciated.

WBR, Andrei Buin.

jim mcnamara · 10-14-2004, 11:50 AM

You need to buffer the input, when you have enough (I don't know how you want to determine "enough") then stream it to output.

A lot of media applications read ~20% of the expected data before they output. This allows the input to be sloer

And yes, this would be better off as two separate threads - one is a reading client - the other is the sound card 'server'
Use shared memory, memory mapped files or possibly pipes.
pipes do not buffer however.