I'm trying to capture 4 tracks using a pair of pdaudio-cf cards. The
drivers load and the cards are shown in /proc/asound on IRQs 17 and
18. I have a .asoundrc setup as in the example on TwoCardsAsOne on
the wiki. The cards are being fed from a pair of clock-synced ADCs.
Everything seems OK until I try to capture from the route device (or
multi device.) The red lights on the cards will come on for a moment,
then the machine will lock up spewing "PDAUDIOCF SRAM buffer overrun
detected!" to the console. Looking in the pdaudiocf driver, the
interrupt handler says that this condition "should never happen."
stat = inw(chip->port + PDAUDIOCF_REG_ISR);
if (stat & (PDAUDIOCF_IRQLVL|PDAUDIOCF_IRQOVR)) {
if (stat & PDAUDIOCF_IRQOVR) /* should never happen */
snd_printk(KERN_ERR "PDAUDIOCF SRAM buffer overrun
detected!\n");
if (chip->pcm_substream)
tasklet_schedule(&chip->tq);
if (!(stat & PDAUDIOCF_IRQAKM))
stat |= PDAUDIOCF_IRQAKM; /* check rate */
}
Any ideas on what is wrong or how to fix this? Perhaps the cards need
to be reset or the buffers drained before starting capture? I'm happy
to hack the driver and submit a patch you tell me what I need to do to
fix it. Any pointers would be appreciated
thanks,
burris
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