Port, board and/or hardware

rp2 port, pico 2 board

MicroPython version

MicroPython v1.24.0 on 2024-10-25; Raspberry Pi Pico2 with RP2350

Reproduction

This is the script I used:

# MicroPython USB MIDI example
#
# This example demonstrates creating a custom MIDI device.
#
# To run this example:
#
# 1. Make sure `usb-device-midi` is installed via: mpremote mip install usb-device-midi
#
# 2. Run the example via: mpremote run midi_example.py
#
# 3. mpremote will exit with an error after the previous step, because when the
#    example runs the existing USB device disconnects and then re-enumerates with
#    the MIDI interface present. At this point, the example is running.
#
# 4. To see output from the example, re-connect: mpremote connect PORTNAME
#
#
# MIT license; Copyright (c) 2023-2024 Angus Gratton
import usb.device
from usb.device.midi import MIDIInterface
import time


class MIDIExample(MIDIInterface):
    # Very simple example event handler functions, showing how to receive note
    # and control change messages sent from the host to the device.
    #
    # If you need to send MIDI data to the host, then it's fine to instantiate
    # MIDIInterface class directly.

    def on_open(self):
        super().on_open()
        print("Device opened by host")

    def on_note_on(self, channel, pitch, vel):
        print(f"RX Note On channel {channel} pitch {pitch} velocity {vel}")

    def on_note_off(self, channel, pitch, vel):
        print(f"RX Note Off channel {channel} pitch {pitch} velocity {vel}")

    def on_control_change(self, channel, controller, value):
        print(f"RX Control channel {channel} controller {controller} value {value}")


m = MIDIExample()
# Remove builtin_driver=True if you don't want the MicroPython serial REPL available.
usb.device.get().init(m, builtin_driver=True)

print("Waiting for USB host to configure the interface...")

while not m.is_open():
    time.sleep_ms(100)

print("Starting MIDI loop...")

# TX constants
CHANNEL = 0
PITCH = 60
CONTROLLER = 64

control_val = 0

while m.is_open():
    time.sleep(1)
    print(f"TX Note On channel {CHANNEL} pitch {PITCH}")
    m.note_on(CHANNEL, PITCH)  # Velocity is an optional third argument
    time.sleep(0.5)
    print(f"TX Note Off channel {CHANNEL} pitch {PITCH}")
    m.note_off(CHANNEL, PITCH)
    time.sleep(1)
    print(f"TX Control channel {CHANNEL} controller {CONTROLLER} value {control_val}")
    m.control_change(CHANNEL, CONTROLLER, control_val)
    control_val += 1
    if control_val == 0x7F:
        control_val = 0
    time.sleep(1)

print("USB host has reset device, example done.")

Expected behaviour

This example code works on a pico 1, here is the output:

MicroPython v1.24.0 on 2024-10-25; Raspberry Pi Pico with RP2040
Type "help()" for more information.
>>> import midi_example
Waiting for USB host to configure the interface...
device disconnected

then mpremote disconnects. I can reconnect and it displays the log output from the example.

kernel log display:

 6041.587646] usb 7-1.1: new full-speed USB device number 9 using xhci_hcd
[ 6041.722135] usb 7-1.1: New USB device found, idVendor=2e8a, idProduct=0005, bcdDevice= 1.00
[ 6041.722144] usb 7-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 6041.722149] usb 7-1.1: Product: Board in FS mode
[ 6041.722153] usb 7-1.1: Manufacturer: MicroPython
[ 6041.722156] usb 7-1.1: SerialNumber: e6613008e343372e
[ 6041.787350] cdc_acm 7-1.1:1.0: ttyACM0: USB ACM device
[ 6259.833061] usb 7-1.1: USB disconnect, device number 9
[ 6260.104404] usb 7-1.1: new full-speed USB device number 10 using xhci_hcd
[ 6260.239359] usb 7-1.1: New USB device found, idVendor=2e8a, idProduct=0005, bcdDevice= 1.00
[ 6260.239362] usb 7-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 6260.239364] usb 7-1.1: Product: Board in FS mode
[ 6260.239365] usb 7-1.1: Manufacturer: MicroPython
[ 6260.239366] usb 7-1.1: SerialNumber: e6613008e343372e
[ 6260.285551] cdc_acm 7-1.1:1.0: ttyACM0: USB ACM device
[ 6260.334768] mc: Linux media interface: v0.10
[ 6260.411764] usbcore: registered new interface driver snd-usb-audio

Observed behaviour

This is the output on the rp2 REPL:

>>> import midi_example
Waiting for USB host to configure the interface...

and it hangs, control characters have no effect.

Meanwhile here is the kernel log:

[ 5138.193121] usb 7-1.1: new full-speed USB device number 4 using xhci_hcd
[ 5138.327835] usb 7-1.1: New USB device found, idVendor=2e8a, idProduct=0005, bcdDevice= 1.00
[ 5138.327845] usb 7-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 5138.327850] usb 7-1.1: Product: Board in FS mode
[ 5138.327855] usb 7-1.1: Manufacturer: MicroPython
[ 5138.327858] usb 7-1.1: SerialNumber: 1c59c033388f3e4e
[ 5138.437887] cdc_acm 7-1.1:1.0: ttyACM0: USB ACM device
[ 5138.437924] usbcore: registered new interface driver cdc_acm
[ 5138.437927] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters

Nothing else is printed.

Additional Information

This is probably a core issue with customizable USB on this new port.

Thank you very much for your work on micropython and also for providing this template.

Code of Conduct

Yes, I agree