Hi,
I wonder if anyone can help me. I was able to use sound driver (GIT kernel
2.6.20 version) in full duplex mode on the DVEVM board with any problems (I can
just do cat /dev/dsp > /dev/dsp and let it run forever without any issues).
However, when I do this on our custom Davinci (which uses exactly the same
codec (AIC33) as the DVEVM), it would stop after 3 to 5 minutes and won't work
again until I reboot the custom board. I wrote a simple full duplex program:
// init dsp
openDsp();
while (1)
{
bytes = read(dspFd, (char *)buffer, fragsize);
if (bytes < 0)
printf("error reading from mic\n");
else
printf("read %d bytes\n", bytes);
wbytes = write(dspFd, buffer, fragsize);
if (wbytes < 0)
printf("error writing to speaker\n");
else
printf("wrote %d bytes\n", wbytes);
}
and it runs fine on the DVEVM. On our Davinci custom board, it would run for
around 3-5 minutes and then seems to stop on the read (sampling from the mic);
I don't get any errors but the read never returns. I'm trying to trace the
problem; I assume the code is in sound/oss/davinci-audio-dma-intfc.c. Can
anyone please recommend how I go about fixing
this issue? Thanks.
Regards,
Andy
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