Messages in this thread | | | Date | Tue, 24 Jan 2006 12:59:32 +0000 | From | James Courtier-Dutton <> | Subject | Re: DMA Transfer problem |
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Harish K Harshan wrote: > Hello, > > Im having problems with DMA transfer on Linux, for an ADC card. The > card is AxiomTek AX5621H, and can use DMA channels 1 and 3. I tried > both the channels, but the DMA transfers are irregular (i.e.) at > different speeds (which of course is not acceptable, since that > application is time critical). The device driver (which I wrote) seems > to work fine for all the other systems I tried it on. But this problem > occurs only on one particular model of computer (Chino-Laxsons > Pentium-4 boards). I tried another system with the same configuration, > but the same resulted. After some time of execution, I get the kernel > panic screen, which says the CPU context is corrupt. Please help me > with this problem, as I need to get this driver working somehow on the > P4 systems. I tried the Redhat-9 kernel (2.4.20-8) and the debian > kernel too (2.2.20).... gave the same results. > Could an ADC card be treated as a ALSA sound card PCM device. That card seems to have features very similar to a sound card. Sample rate. Variable gain. Multi-channels. ADC DMA
I only suggest this, because it could result in a driver that is much easier to implement as ALSA supplies a lot of generalised support code at the kernel level.
James
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