This is the mail archive of the
ecos-discuss@sourceware.org
mailing list for the eCos project.
Re: MPC555 serial receive drops bytes
> With the exception fixed, I was still getting overruns so I moved the
> code out of the DSR code into the ISR to improve latency. Since its only
> moving a byte out of a register, I thought it doesn't really need a DSR.
You have to be very careful here. You cannot call the
(chan->callbacks->rcv_char)(chan, (cyg_uint8)scdr);
from ISR context. It has to be in DSR context. It will play around
with threads, unblocking readers etc, which can only be done safely in
DSR context.
Andrew
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss