[alsa-devel] Wall clock interrrupts

Clemens Ladisch cladisch at fastmail.net
Fri Jan 25 08:55:53 CET 2008

James Courtier-Dutton wrote:
> Do all sound cards hardware have wall clocks that one can generate 
> interrupts from?
> I know all Creative and E-Mu cards do.

Some ISA cards and the Yamaha DS-1 chips do; all other cards have only
the PCM period interrupt.

> I am looking to use the wall clock interrupt for triggering events in 
> application space,

I guess you want to synchronize those events to the PCM playback?
This makes sense only when the PCM is running, and in that case you can
use the PCM slave timer.


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