Hi Axoloti community,
I searched the forum for something like a "MIDI event converter" but did not find anything. After some fiddeling around i was able to solve my problem myself. This little piece of code converts specific MIDI_PROGRAM_CHANGE events to specific MIDI_CONTROL_CHANGE events. I've placed it via midi/in/script object.
I have zero experience in coding C but luckily i was able to achieve exactly what i wanted. Any advice how to improve this script?
Finding out how to force a different timestamp for fired MIDI events took me some time. so i place my search terms in this post: sleep, usleep, wait, microwait, pause, micropause, change timestamp
my solution was chThdSleepMilliseconds(50);
so here is my tiny event converter script
/**
* MIDI-Event-Converter for axoloti
* from PROGRAM_CHANGE events of a "Boss FC-50 Midi foot controller"
* to CONTROL_CHANGE Events for a "Boss RC-505 Loop Station"
*
* After powering the FC-50 the yellow LED is active
* Pedal 1 to 5 fires PROGRAM_CHANGE events with values 0,1,2,3,4
* Pedal 6 toggles between yellow and green LED
* Pedal 1 to 5 fires PROGRAM_CHANGE events with values 5,6,7,8,9
*
* there is no possibility to change this behaviour on the FC-50
* the RC-505 is not capable to control loops via PROGRAM_CHANGE
* so we send CONTROL_CHANGE events instead
*
*/
if (dev == MIDI_DEVICE_DIN) {
if (status == MIDI_PROGRAM_CHANGE) {
int targetCC = 0;
/* yellow LED mode on the FC-50 */
if(data1 == 0) { targetCC = 21; }
if(data1 == 1) { targetCC = 26; }
if(data1 == 2) { targetCC = 22; }
if(data1 == 3) { targetCC = 27; }
/* green LED mode on the FC-50 */
if(data1 == 5) { targetCC = 23; }
if(data1 == 6) { targetCC = 28; }
if(data1 == 7) { targetCC = 24; }
if(data1 == 8) { targetCC = 29; }
if(targetCC != 0) {
/* RC-505 needs a value between 64 and 127 to trigger CC configured loop operation */
MidiSend3(MIDI_DEVICE_DIN, 0, MIDI_CONTROL_CHANGE, targetCC, 64);
/**
* force different timestamp for the next event
* otherwise the RC-505 refuses to process incoming event
*/
chThdSleepMilliseconds(50);
/* RC-505 needs a value between 0 and 63 to trigger standby for CC configured loop operation */
MidiSend3(MIDI_DEVICE_DIN, 0, MIDI_CONTROL_CHANGE, targetCC, 63);
}
}
}
/**
* additionally pass through incoming clock events of the device port
* to the din out port
*/
if (dev == MIDI_DEVICE_USB_DEVICE) {
if ((status == MIDI_TIMING_CLOCK) ||
(status == MIDI_START) ||
(status == MIDI_CONTINUE) ||
(status == MIDI_STOP)) {
MidiSend1(MIDI_DEVICE_DIN,0,status);
}
}