diff options
| author | Thomas White <taw@physics.org> | 2021-05-06 20:56:32 +0200 |
|---|---|---|
| committer | Thomas White <taw@physics.org> | 2021-05-06 21:06:19 +0200 |
| commit | 7611fe55164efb00f3b83a4f137c5b7ea9bf6bd5 (patch) | |
| tree | 2a0caacea8bc11208aeea78c2644927106ebf8a6 | |
| parent | 40d564b7427f4e58b53962aeb1fea8d431bcca6f (diff) | |
Slow down MIDI transmisisons
My control surface (A&H Xone:K2) seems to respond badly to being blasted
with note on/off events to turn its LEDs on and off: some of the LEDs
end up in the wrong state. The effect is reproducible using a small
test program using the ALSA API from C, which excludes multi-threading
problems in Starlet and buffer overruns in the ALSA device. The
controller simply doesn't cope well with large numbers of events
arriving in quick succession.
Adding a very small delay seems to completely fix the problem without
causing any noticable flicker.
| -rw-r--r-- | guile/starlet/midi-control/base.scm | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/guile/starlet/midi-control/base.scm b/guile/starlet/midi-control/base.scm index 9585766..cbd113e 100644 --- a/guile/starlet/midi-control/base.scm +++ b/guile/starlet/midi-control/base.scm @@ -218,7 +218,8 @@ (let again () (let ((bytes-to-send (atomic-box-swap! send-queue '()))) (for-each (lambda (a) - (put-u8 midi-port a)) + (put-u8 midi-port a) + (usleep 1)) bytes-to-send) (usleep 1000) (again)))) |