Sound on OMAP1510 Innovator

Sound on OMAP1510 Innovator

[Prakash Narayanan M]

Hai all

 

I am trying to use the Sound device on Innovator OMAP1510.

I am testing with a c code to acquire for sometime (3s) through the mic
and replay it through the speaker.

 

What the program does?

 

1. opens /dev/mixer and set the mic gain to 100 and close /dev/mixer

2. opens /dev/dsp (Read only mode) and set the parameters

3. reads the mic values to a buffer and close /dev/dsp

4. opens /dev/mixer and set the mic gain to 0 and close /dev/mixer

5. opens /dev/dsp (Write only mode) and set the parameters

6. write the buffer to /dev/dsp device

 

OBSERVATIONS:

In step 2 the following message comes but proceeds further

            "SOUND_PCM_READ_BITS ioctl failed: Invalid argument"

 

Then in step 4 the following message commes and exit(1) is done in the
code

            "open of /dev/mixer failed: Device or resource busy"

 

All throughout the running of the program the speaker produces noise and
do not produce an legible sound.

 

/dev/dsp and /dev/mixer is put in the FS with rights as told in the
Linux Kernel website.

 

Also instead of using the program we tried with 

 

#cat /dev/dsp > file

#cat file > /dev/dsp

 

This also produces just noise.

 

When kernel is booted the following modules are loaded

 

Loading modules on the device

Using i2c-core.o

Using i2c-algo-bit.o

Using i2c-omap1510.o

i2c_omap1510_init: OMAP1510 I2C module

Using soundcore.o

Using omap-audio.o

Using omap1510-aic23.o

aic23_attach: chip found @ 0x1b

OMAP1510 audio support initialized 

 

Anyone who has knowledge about the usage of sound device in OMAP1510
Innovator please help me out.

 

Thanks in advance

 

Regards

Prakash

Re: Sound on OMAP1510 Innovator

[lamikr]

Hi

Assuming that you are using /dev/dsp you are using OSS version from the
aic23 driver, am I correct?
Have you tested with the alsa version? In addition is normal music play
working ok for you?
("cat song.wav > /dev/dsp" with the oss driver and "aplayer song.wav"
with the alsa driver)

Mika

>I am trying to use the Sound device on Innovator OMAP1510.
>
>I am testing with a c code to acquire for sometime (3s) through the mic
>and replay it through the speaker.
>  
>