On Tuesday 26 November 2002 00.24, you wrote: > Hi all, > > When I try to use mmap with this card I get the following behaviour: > (BTW, I give an explicit snd_pcm_start) > In stereo-mode (device 0), I can preload the buffer with 2 periods of > audio data, start and it works well. > In ADAT-mode (device 1), trying to preload with 2 periods, gives a > very distorted sound. It only works with preloading 3 (or more) > periods before starting. > > When I use regular writei, I don't see this limitation. I only need 2 > periods of audio in ADAT-mode. > > > Is this a bug of the driver, or a property of the card?
It was a while I looked at the driver last, and I don't use it in memory mapped mode nor ADAT in my daily work, so I really don't know about the state of the driver in those parts. The hardware does not support memory mapped I/O, so it is copied by the CPU in the interrupt handler. Thus for that card you gain nothing from using memory mapped I/O, it was only implemented for compability. I shall save this mail into "stuff I should look into", but right now it is unfortunately not among my top-ten items on the to do list. /Anders Torger ------------------------------------------------------- This SF.net email is sponsored by: Get the new Palm Tungsten T handheld. Power & Color in a compact size! http://ads.sourceforge.net/cgi-bin/redirect.pl?palm0002en _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
