sketch

Author: ladyada

adafruit_midi.py

@@ -0,0 +1,46 @@
+class MIDI:
+    """A helper for encoding/decoding MIDI packets over a midi or uart connection"""
+
+    NOTE_ON = 0x90
+    NOTE_OFF = 0x80
+
+    def __init__(self, midi_in, midi_out, *, in_channel=None, out_channel=0):
+        self._midi_in = midi_in
+        self._midi_out = midi_out
+        self.in_channel = in_channel
+        self.out_channel = out_channel
+        self._debug = True
+
+    @property
+    def in_channel(self):
+        return self._in_channel
+
+    @in_channel.setter
+    def in_channel(self, channel):
+        if (channel is not None) and not (0 <= channel <= 15):
+            raise RuntimeError("Invalid input channel")
+        self._in_channel = channel
+
+    @property
+    def out_channel(self):
+        return self._out_channel
+
+    @out_channel.setter
+    def out_channel(self, channel):
+        if not (0 <= channel <= 15):
+            raise RuntimeError("Invalid output channel")
+        self._out_channel = channel
+
+    def note_on(self, note, vel, channel=None):
+        if not (0 <= note <= 0x7F):
+            raise RuntimeError("Note value invalid")
+        if not (0 <= vel <= 0x7F):
+            raise RuntimeError("Velocity invalid")
+        if not channel:
+            channel = self._out_channel
+        self._send([self.NOTE_ON | channel, note, vel])
+
+    def _send(self, packet):
+        if self._debug:
+            print("Sending: ", [hex(i) for i in packet])
+        print(self._midi_out(packet))