Hi All,
I am writing a serial driver in C and would like to know what is realistic performance for such a beast. I basically have a ringbuffer to isolate the client from the internals of the driver. The ringbuffer structures (one for Tx and one for Rx) currently live in XDATA - is this going to kill me? The ISR has been declared as 'small' yet I am concious that each access to the ringbuffer structure is going out to XDATA - just how 'bad' is this?
With this rather simple setup I seem to drop the odd byte when running at 9.6K - I am simply sending a file via HyperTerminal into the micro and spitting it straight back out again. I have not completely ruled-out that the dropped bytes are not ocurring elsewhere, but I wanted to get the opinion of you learned folk on what is realistic for this kind of driver setup at the micro.
Thanks for any feedback.
Andy