[alsa-devel] Help requested: new HSS1394 MIDI back-end

[Sean M. Pappalardo - D.J. Pegasus]

Hello again.

Sorry for the delay. I've been quite busy in the last week.

On 05/31/2012 10:00 PM, Clemens Ladisch wrote:
> I wrote:
>> 00 F9 xx yy zz ->  F0 00 01 60 48 53 53 00 00 0F 09 0x 0x 0y 0y 0z 0z F7

This appears to work fine. But where did you get the leading 00 from? 
libhss1394 just sends F9 xx yy zz.

>> 13 xx yy zz<- F0 00 01 60 48 53 53 01 03 0x 0x 0y 0y 0z 0z F7
>> 14 xx yy zz<- F0 00 01 60 48 53 53 01 04 0x 0x 0y 0y 0z 0z F7
 >> (0x13 = 0x10 + 3 = kUserTagBase + uUserTag)

I'm not clear on how you arrived at that formula. HSS1394.h shows:

//! Send a user control message via the channel to the target
//! node. Returns the number of bytes sent on success, zero on
//! failure. uUserTag is valid in the range 0x00 - 0xDF. All other
//! tag values will be rejected (0 return).
virtual uint SendUserControl(uint8 uUserTag, const uint8 *pUserData,
                              uint uDataBytes) = 0;

It appears to work with arbitrary-length user data strings, though the 
Stanton docs only specify 3-byte ones at this time.

Sincerely,
Sean M. Pappalardo
"D.J. Pegasus"
Mixxx Developer - Controller Specialist

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