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17.08.06 uwe@ptc.spbu.ru wrote:

> There's no sound *card* in sh3 jornadas.  There's an on-chip 8-bit DAC
> and one of its channels is hooked to the speaker.  You need to feed
> the DAC directly from the CPU.  This means that you need to have 8K
> interrupts per second to play even crappy lo-fi 8KHz 8bit audio.

I tried to do it in userspace (I'm new to NetBSD so writing a custom 
driver could be kind of challenge for now) and even managed to output 
some sound (and learned the hard way that securelevel greater than 0 
prevents readwrite /dev/mem accesses), but it seems that there's no 
easy way to get the userspace code executed at 8000 Hz. NetBSD doesn't 
seem to have a realtime scheduler (seems strange, so maybe I'm wrong) 
and setitimer() and usleep() on this CPU just doesn't work at this 
frequency even when reniced to -20. Maximum archieved frequency, 
both using setitimer() and usleep(), was 32 Hz.

[gophi@hpcsh ~/src]$ make test && sudo nice -n -20 ./test
cc -O   -o test test.c
us=3122254 (should be 1000000), freq=32 (should be 100)

[gophi@hpcsh ~/src]$ make test2 && sudo nice -n -20 ./test2
cc -O   -o test2 test2.c
us=3119995 (should be 1000000), freq=32 (should be 100)

(test.c and test2.c attached)

> There is on-chip DMAC that can do timed transfers using internal 
> counter-timer, but attempts to use it wedge the machine ~immediately.

Seems promising. Have you tried it with a lower frequency than 8 kHz? 
Maybe it just didn't worked because of too high frequency. Do you have 
some details on this controller?

-- 
[ Adam Wysocki, www.chmurka.net, GSM: +48 514 710 213 ]
[ Software Development Department, ArcaBit Sp. z o.o. ]
[ Ul. Fortuny 9 :: 01-339 Warszawa :: www.arcabit.com ]
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