Hey, did you manage to get your pcm1803 working? Can you give me some advice to get mine working? Thanks Fritz
Am Donnerstag, 23. Januar 2014 03:44:14 UTC+1 schrieb eze_rg: > > Hi, could you share the code of your project? I'm trying to connect only > one ADC to the beaglebone (pcm1803) and i cant get it registered by alsa. I > wrote a custom codec driver, and modified davinci.evm.c. > Any help would be appreciated. > Thanks! > Regards > > El jueves, 14 de marzo de 2013 10:12:47 UTC-3, ChrisSchuku escribió: >> >> Hi, >> >> I'm capturing an 8-channel TDM stream (32 bit slots) on the BeagleBone >> running Ubuntu. My problem is, that when CPU is under heavy load, channels >> are swapping like crazy (ie. signal from channel one is suddenly on channel >> 8, then on 5, ...). >> Analyzing the recorded stream I found that the reason for this is that >> sometimes one time-slot within a frame is missing (is skipped). Since this >> behaviour correlates with the CPU load, I'm pretty sure that it's not the >> codec that messes up the TDM stream. Rather I suspect the problem to be on >> the McASP or EDMA side of the ALSA driver. >> Unfortunately I really have no idea how to track down this problem >> further - I only know that somewhere along the way from the McASP input >> pins to the ALSA API some timeslots (1 slot is 4 Byte long) get lost. >> >> Has anyone ever experienced similar behaviour or can anyone suggest a way >> to debug this problem (I can't seem to get any hints from kernel messages >> on this)? >> >> Btw: It seems to me, that currently ping/pong buffering is not being used >> as davinci_pcm_enqueue_dma (sound/soc/davinci/davinci-pcm.c) is called on >> every DMA interrupt. Is that something to look into? >> >> Any suggestion are very much appreciated! >> >> best, >> Chris >> >> >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
