I'm pleased to announce that ALSA now has support for the Hammerfall
DSP audio interface. Details of the Hammerfall DSP are available at
RME's website (www.rme-audio.com). The driver supports:
* all sample rates
* both MIDI ports
* "simple mixer" controls to allow alsamixer to control
each playback stream's volume. Remember: as usual
with ALSA, the initial state is "all output muted".
* peak meters for input, output and playback, with serial
clipping counters.
* a non-standard control element for the matrix mixer (this
may change; do not plan long term application support
around it)
Things that are not tested but should work:
* big-endian systems
* multiface i/o box
* cardbus interface
* different sample clock sync sources
Things that don't work:
* RMS meters
* Flashing the firmware into the I/O box
The driver is similar in some ways the Hammerfall driver. Most
notably, it requires large chunks of physically contiguous
memory. This is best provided for by loading the snd-hammerfall-mem
module early during booting, which provides memory for both Hammerfall
and Hammerfall DSP drivers. The module has a snd-enable option which
takes a comma-separated list of 0's or 1's indicating whether or not
to allocate memory for the n'th Hammerfall or Hammerfall DSP
device. If you have only once such device, then snd-enable=1 will be
sufficient. The module checks for installed devices, so you can always
insert the module and the right thing will happen even if you have
removed your Hammerfall/Hammerfall DSP cards.
I am sure there will be minor glitches along the way. I would really
appreciate feedback from anyone with an H-DSP (marcus - that means
you! :)
A huge thank you to RME for the foresight and sense to make available
sufficient information to make this driver possible.
--p
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