Re: es18xx - 1869 not working, debugging ALSA drivers

[Takashi Iwai <tiwai@suse.de>]

At Tue, 5 Nov 2002 20:33:16 +0100,
kasper@303.nu wrote:
> 
> Hi,
> 
> I've been trying to get ALSA running on my Compaq Armada 3500 for quite a 
> while now. The soundchip is a es1869, which is supposed to be supported by 
> the es18xx driver. It only works 1 out of 10 times though - and I figured out 
> when it works and when it doesn't... But that didn't help me much until now, 
> I tried to force it to always use the working mode, but that didn't work 
> out...
> 
> The OSS driver is working properly, but I use the Soundblaster driver, which 
> is only half-duplex, and in fact, it's a different mode of the soundchip.

i've seen this on my colleague's laptop.
it seems that the second DAC (which is used for the playback) doesn't
work although it looks as if initialized properly.

perhaps an easy solution is to make a module option to make the driver
work as half-duplex.



> I've been trying to debug the driver, but it's not really my thing... Maybe 
> there are some handy tricks to debug ALSA drivers? Or is it just:
> 1) change the source
> 2) compile the source
> 3) see if it works (by loading the module.. and playing some audio)
> 4) if it doesn't work restart with 1)
> 
> Are there tools to control soundchips without using this laborious cycle? Some 
> kind of framework to check out the stuff that is written in the chip's 
> datasheet?

i'd love to have such a tool :)

btw, if you need to access only i/o ports, then even a user program
can do.  it would be easier than recompiling the driver.


Takashi


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