On Thu, October 21, 2010 5:51 pm, Rory Filer wrote: > Hi > > I'm working on a custom-built embedded platform with the Marvell PXA310 > processor, trying to make one of the SSP outputs work in I2S mode. Today I > managed to get everything to compile and boot, but nothing appears in > /dev/audio and I'm not sure what to do next.
What about /proc/asound ? > Here's the relevant portion > of > the startup log: > > Advanced Linux Sound Architecture Driver Version 1.0.18rc3. > ASoC version 0.13.2 > littleton_init > Dummy(Codec) SoC Audio Codec > Littleton init done: 0 > ALSA device list: > No soundcards found. > > In this log, "littleton" is the machine level driver which I believe is > analogous to Corgi.c or spitz.c My hardware platform has no actual CODEC > chip so I created a dummy one and then made all the functions return zero > (i.e. return 0) to fool the system into thinking there actually was a DAC > present. In other words, my hardware consists of the Marvell CPU with its > I2S output feeding into an external chip that will take this audio and > (hopefully) play it. That external chip is not a DAC. I know it's > primitive, > but I'm just learning all this stuff and can tackle a genuine DAC later > on. > Since most of the SoC code I've looked at uses an external chip for the > DAC > I thought this architecture would work, although it may not be very > practical. > > NOTE: my kernel has the drivers built-in and not created as modules, if > that > matters. > > I think I must be close to being able to play a tune through this devkit, > but I don't know what I'm missing. I'd appreciate any suggestions, > > Cheers All > > Rory > _______________________________________________ > Linux-audio-dev mailing list > [email protected] > http://lists.linuxaudio.org/listinfo/linux-audio-dev > -- Patrick Shirkey Boost Hardware Ltd. "ZPE is not about creating something from nothing: It is about using the zero point of a wave as a means to transform other forms of potential energy like magnetic flux, heat, or particle spin into usable energy in such a way that entropy appears to be reversed." _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
