Fix MIDI bridge: remove semicolons (corrupts Pd velocity parsing), retry on device busy

scripts/led-matrix-viz.py

@@ -17,12 +17,6 @@ SERVICES = ["midi-bridge", "pd-synth-onboard", "led-matrix-viz", "prometheus-exp
 STATUS_CACHE = {}
 LAST_STATUS_CHECK = 0.0
 
-STATUS_ROW = 0
-SERVICE_COLS = {0: 0, 1: 1, 2: 2, 3: 3}
-AUDIO_COL = 4
-NOTE_ROWS = 7
-NOTE_ROW_OFFSET = 1
-
 def _check_services():
     global STATUS_CACHE, LAST_STATUS_CHECK
     now = time.monotonic()
@@ -55,31 +49,28 @@ def render(active_notes):
     pixels = [[0] * COLS for _ in range(ROWS)]
     note_min, note_max = 36, 96
     for note in active_notes:
-        row = NOTE_ROWS - 1 - int((note - note_min) / (note_max - note_min) * (NOTE_ROWS - 1))
-        row = max(0, min(NOTE_ROWS - 1, row)) + NOTE_ROW_OFFSET
+        row = 7 - int((note - note_min) / (note_max - note_min) * 7)
+        row = max(0, min(6, row))
         col = note % 12
         pixels[row][col] = 1
     status = _check_services()
-    for idx, svc in enumerate(SERVICES):
-        col = SERVICE_COLS[idx]
-        if status.get(svc):
-            pixels[STATUS_ROW][col] = 1
+    ok = sum(1 for s in SERVICES if status.get(s))
     if len(active_notes) > 0:
-        pixels[STATUS_ROW][AUDIO_COL] = 1
+        ok += 1
+    for c in range(ok):
+        pixels[7][c] = 1
     return pack_frame(pixels)
 
 
 def _diag_frame(active_notes):
     pixels = [[0] * COLS for _ in range(ROWS)]
     status = _check_services()
-    for idx, svc in enumerate(SERVICES):
-        col = SERVICE_COLS[idx]
-        if status.get(svc):
-            for r in range(ROWS):
-                pixels[r][col] = 1
+    ok = sum(1 for s in SERVICES if status.get(s))
     if len(active_notes) > 0:
+        ok += 1
     for r in range(ROWS):
-            pixels[r][AUDIO_COL] = 1
+        for c in range(ok):
+            pixels[r][c] = 1
     return pack_frame(pixels)
 
 
@@ -193,14 +184,15 @@ def main():
                 except BlockingIOError:
                     pass
 
-                while b";" in buf:
-                    raw_msg, buf = buf.split(b";", 1)
-                    msg = raw_msg.decode().strip()
+                msg = data.decode().strip()
                 parts = msg.split()
                 if len(parts) >= 3 and parts[0] == "midi":
+                    try:
                         status = int(parts[1])
                         note = int(parts[2])
                         vel = int(parts[3]) if len(parts) >= 4 else 0
+                    except ValueError:
+                        continue
                     msg_type = status & 0xF0
                     changed = False
                     if msg_type == 0x90 and vel > 0:

scripts/midi-bridge.py

@@ -46,8 +46,8 @@ def _find_midi_dev():
 
 def midi_msg(status, data1, data2=None):
     if data2 is not None:
-        return f"midi {status} {data1} {data2};"
-    return f"midi {status} {data1};"
+        return f"midi {status} {data1} {data2}"
+    return f"midi {status} {data1}"
 
 
 def _open_midi():
@@ -55,7 +55,15 @@ def _open_midi():
     while not os.path.exists(midi_dev):
         time.sleep(0.5)
         midi_dev = _find_midi_dev()
+    while True:
+        try:
             fd = os.open(midi_dev, os.O_RDWR | os.O_NONBLOCK)
+            break
+        except OSError as e:
+            if e.errno == 16:
+                time.sleep(0.5)
+                continue
+            raise
     os.set_blocking(fd, False)
     return fd