DM355 and sound

Kirill Brilliantov

Other Parts Discussed in Thread: TLV320AIC22C, TLV320AIC33

Hello! I have board with DM355 and sound chip TLV320AIC22c and I compiled kernel with sound support. What can I do to get sound from my board? Thank you and excuse me for my bad english.

over 16 years ago

0 Bernie Thompson TI over 16 years ago

TI__Mastermind 41665 points

Assuming you have both audio input and output setup with OSS support than you could try 'cat /dev/dsp > /dev/dsp' to start an audio loopback, or 'cat test.wav > /dev/dsp' to play back a raw wav file.

0 Juan Gonzales over 16 years ago

TI__Mastermind 37340 points

Kirill,

to add to Bernie's response, can you confirm if you have developed the driver for TLV320AIC22c part and this is what is being compiled into the kernel. I ask this because the kernel we provide with our EVM supports a different TVL part found on our EVM.

0 Kirill Brilliantov over 16 years ago in reply to Juan Gonzales

Genius 3510 points

Hello Juan! My SDK contains linux 2.6.10 and drivers for TLV320AIC33. At this moment I have modified drivers to manage it via ioctl.

0 Juan Gonzales over 16 years ago in reply to Kirill Brilliantov

TI__Mastermind 37340 points

Kirill said:
At this moment I have modified drivers to manage it via ioctl.

Does this mean you have modified it to support TLV320AIC22c? If so, the commands Bernie described above is an easy way to test the driver. If this does not work, then we may have to dig into the source code changes needed to support AIC22.

0 Kirill Brilliantov over 16 years ago in reply to Juan Gonzales

Genius 3510 points

Juan Gonzales said:
Does this mean you have modified it to support TLV320AIC22c?

I can read/write registers. Board work with custom system based on the BusyBox. Do I need setup sound system OSS or ALSA or not? Usually on PC I need to install sound system to get sound.

0 Kirill Brilliantov over 16 years ago in reply to Kirill Brilliantov

Genius 3510 points

Hello! As I write earlier I can read/write registers, but I can't get sound. When I look with oscilloscope I see that the signal goes from AIC22 to CPU, but there is no signal from CPU output. In datasheet for AIC22 there are time slots. I think my problem in wrong configuration of the time slots, but I have't found where I can configure them. Can you help me?

0 Juan Gonzales over 16 years ago in reply to Kirill Brilliantov

TI__Mastermind 37340 points

Kirill said:
Board work with custom system based on the BusyBox.

When you made the statement above, did you mean board, including sound, works ok with BusyBox pased system? Since you appear to be working with both custom hardware and software (modified drivers), we need to narrow down the problem. At this point, I am not sure we can rule out a problem with the hardware unless you have heard sound out of this system before.

Unfortunately, I am not familiar with AIC22, but you can try posting your AIC-related question in our Audio Open Discussion forum : http://e2e.ti.com/forums/81.aspx

0 Kirill Brilliantov over 16 years ago in reply to Juan Gonzales

Genius 3510 points

Thank you for your answer Juan!

I only started to work with sound and I did't get sound from our board. But I use TI kernel, with my little change, and original develop board build on the BusyBox. So, I think problem is not in the BusyBox because original board OS build on the base BusyBox. Also I think problem is not in my modified driver because I insert only manage via ioctl.

Of course I will post my question on the Audio Open Discussion forum.

0 Kirill Brilliantov over 16 years ago in reply to Kirill Brilliantov

Genius 3510 points

Hello!

Where can I find datasheet on the McBSP for DM355?

I have found datasheet only to Audio Serial Port (ASP) SPRUED3C. I think can solve my problem after configure McBSP.

Thank you.

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DM355 and sound