Re: Problems with a PCM driver

[James Courtier-Dutton <James@superbug.demon.co.uk>]

Adrian McMenamin wrote:
> On Saturday 30 August 2003 20:14, James Courtier-Dutton wrote:
> 
>>Adrian McMenamin wrote:
>>
>>>I am writing a PCM driver for the AICA device on the Sega Dreamcast for a
>>>2.6.0-testX kernel.
>>>
>>>The driver is far from complete, but I am having various problems when I
>>>test bits of it...
>>>
>>>A simple write of a file gives me this...
>>>
>>>/dev/snd # cat /test.txt > pcmC0D0p
>>>ALSA sound/sh/aica.c:165: In snd_aica_playback_open
>>>ALSA sound/sh/aica.c:80: Disabling AICA device
>>>ALSA sound/sh/aica.c:66: Enabling AICA device
>>>cat: write: File descriptor in bad state
>>>
>>>The three snd_printk messages are just what I would expect but I am not
>>>sure why I get the message about the file descriptor.
>>
>>Why don't you do instead: -
>>aplay test.txt
>>
> 
> Is aplay a system call?
> 
> All I get is this...
> 
> /dev/snd # aplay /test.txt
> aplay: No such file or directory
> 
> 
> Incidentally, the mini-HOWTO on the site says this:
> 
> Now you are ready to put any soundfile you want into the PCM device of the 
> first card. So try to cat any textfile (any file) to /dev/snd/pcmC0D0, like 
> this: cat <filename> > /dev/snd/pcmC0D0. 
> 
> Thanks for the help anyway :)
> 
> Adrian
> 
> 
Have you installed alsa correctly?
alsa-driver, (Kernel modules like the one you are developing)
alsa-lib, (the alsa api.)
alsa-utils, (the one with aplay in it.)
alsa-tools (other useful tools.)
alsa-oss (if you want oss emulation in userland.)

Cheers
James



-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Welcome to geek heaven.
http://thinkgeek.com/sf