rppicomidi
commented
4 days ago @SoerenSofke Thank you for taking the time to file this issue. I see nothing wrong with your expectations.
I do not have the feather board, so I can only take guesses on how to help. I will try to figure it out with you if you will work with me. Please accept my apology in advance if you have already done the basic steps.
First, verify you have selected the Adafruit Feather RP2040 USB Host board as the board type in the Arduino IDE.
Next, do you have a way to measure the power output of the Feather's USB host port? If so, please verify that you are measuring a full +5VDC between the USB A port's VBus pin and ground. Measure before you plug the device to the port and afterwards. The Feather board uses the RP2040's GPIO 18 to turn on the 5V VBus power to the host port. I am not sure if the software activates the pin or not. If the power is good before you plug in but not afterwards, then the surge current of the device you are plugging in may be too high or you may be otherwise overloading your computer's USB port's power output capability. If you have a powered hub you can put between the computer and the Feather board or between the Feather board and your MIDI device, that may solve the problem.
If power is a steady 5V, please modify the example code to not transmit MIDI to your MIDI messages to your device. That will tell us if the problem is related to sending to your MIDI device. You can disable the transmissions by commenting out the sendNextNote() function call in the loop() function as follows:
void loop() {
// Handle any incoming data; triggers MIDI IN callbacks
usbhMIDI.readAll();
// Do other processing that might generate pending MIDI OUT data
// Commenting this line out ==> sendNextNote();
// Tell the USB Host to send as much pending MIDI OUT data as possible
usbhMIDI.writeFlushAll();
// Do other non-USB host processing
blinkLED();
}If none of these things solve the problem, please tell me more about the brand and model of the MIDI device you are plugging to the Feather board.
SoerenSofke
Hi,
I really appreciate this library, as it provides an excellent starting point for my own project, which is to create a MIDI message filter. I intend to instrument EZ_USB_MIDI_HOST on my Adafruit Feather RP2040 with USB Type A Host, connect a MIDI device to the USB Type A Host connector on the Feather and a PC with a software synthesizer on the USB Type C connector on the Feather.
However, I can not even make the given example, e.g. EZ_USB_MIDI_HOST_PIO_example.ino run as expected.
My development environment
Things that work as expected
Compilation and upload of EZ_USB_MIDI_HOST_PIO_example.ino with modification in
setup1(), e.g.Serial monitor in Arduino IDE output diagnostic strings, incl. diagnostics regarding incoming MIDI messages, e.g.
Things that do NOT work as expected
Once the connected MIDI device does not send MIDI events for more than ~ 3 seconds, the Arduino software EZ_USB_MIDI_HOST_PIO_example.ino stops handling MidiInCallbacks, e.g. onNoteOn, onNoteOff, but also onMIDIdisconnect, etc.
The MIDI device cannot be hot-plugged, i.e. it must be connected to the USB Type A port before Feather is powered up (which is less important for now but might be an issue as well).
How to proceed
Thanks, Sören