Merge pull request #9 from FoamyGuy/usb_read_timeout

Add Fruit Jam example. use a timeout for USB host MIDI read.

Author: FoamyGuy

examples/usb_host_midi_simpletest.py

@@ -18,7 +18,7 @@
 while raw_midi is None:
     for device in usb.core.find(find_all=True):
         try:
-            raw_midi = adafruit_usb_host_midi.MIDI(device)
+            raw_midi = adafruit_usb_host_midi.MIDI(device, timeout=0.01)
             print("Found", hex(device.idVendor), hex(device.idProduct))
         except ValueError:
             continue

examples/usb_host_midi_simpletest_fruitjam.py

@@ -0,0 +1,64 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025 Tim Cocks for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import adafruit_midi
+import adafruit_tlv320
+import audiobusio
+import board
+import synthio
+import usb.core
+from adafruit_midi.note_off import NoteOff
+from adafruit_midi.note_on import NoteOn
+from displayio import release_displays
+from pwmio import PWMOut
+
+import adafruit_usb_host_midi
+
+release_displays()
+print("Looking for midi device")
+raw_midi = None
+while raw_midi is None:
+    for device in usb.core.find(find_all=True):
+        try:
+            raw_midi = adafruit_usb_host_midi.MIDI(device, timeout=0.01)
+            print("Found", hex(device.idVendor), hex(device.idProduct))
+        except ValueError:
+            continue
+
+
+mclk_pwm = PWMOut(board.I2S_MCLK, frequency=15_000_000, duty_cycle=2**15)
+
+i2c = board.I2C()
+dac = adafruit_tlv320.TLV320DAC3100(i2c)
+
+# set sample rate & bit depth, use bclk
+dac.configure_clocks(sample_rate=44100, bit_depth=16, mclk_freq=15_000_000)
+
+# use headphones
+dac.headphone_output = True
+dac.dac_volume = -5  # dB
+dac.headphone_volume = -30
+audio = audiobusio.I2SOut(board.I2S_BCLK, board.I2S_WS, board.I2S_DIN)
+
+synth = synthio.Synthesizer(sample_rate=44100)
+audio.play(synth)
+
+midi = adafruit_midi.MIDI(midi_in=raw_midi, in_channel=0)
+
+pressed = {}
+
+while True:
+    msg = midi.receive()
+    if isinstance(msg, NoteOn) and msg.velocity != 0:
+        note = synthio.Note(synthio.midi_to_hz(msg.note))
+        print("noteOn: ", msg.note, "vel:", msg.velocity)
+        synth.press(note)
+        pressed[msg.note] = note
+    elif (
+        isinstance(msg, NoteOff) or (isinstance(msg, NoteOn) and msg.velocity == 0)
+    ) and msg.note in pressed:
+        print("noteOff:", msg.note, "vel:", msg.velocity)
+        note = pressed[msg.note]
+        synth.release(note)
+        del pressed[msg.note]

examples/usb_host_midi_simpletest_rp2040usbfeather.py

@@ -19,7 +19,7 @@
 while raw_midi is None:
     for device in usb.core.find(find_all=True):
         try:
-            raw_midi = adafruit_usb_host_midi.MIDI(device)
+            raw_midi = adafruit_usb_host_midi.MIDI(device, timeout=0.01)
             print("Found", hex(device.idVendor), hex(device.idProduct))
         except ValueError:
             continue