[Angstrom-devel] Modifying audio register value in Angstrom

[Almohanad Fayez]

Hi,  I'm running the Angstrom on the Beagleboard and I'm trying to find a way to modify the audio rate register values to force sampling rates other than 44.1 kHz and 48 kHz.  Basically when I run "cat /sys/devices/platform/soc-audio/codec_reg" register 0x1 reads 0x91 which from the datasheet means the sampling rate = 44.1kHz.  I'm trying to set register 0x1 to 0x81 to force it to run at 32 kHz.  but the "echo 1 81 > codec_reg" command is apparently not supported and from the angstrom the register is read-only I even tried chmod +w the register but that didn't work.

I tried using debugfs to modify the register value unfortunately  the functionality isn't available through that.  I found a few listings online of ALSA patches that expose the register during debugfs, after copying and pasting them I still couldn't access the register.  When I tried modifying the twl4030.c driver in the openembedded directory linux-omap-2.6.28/git/audio/soc/twl4030.c  by basically hardcoding the reigster value to 0x81 it still didn't work.


I'm running the 2.6.28.  can anyone share some advice ???


al fayez