9 years, 3 months ago.

Getting USBMIDI to work on Nucleo F401

Hey,

I'm new to mbed and C++ (coming from arduino), sorry if I make a noob mistake here. I'm trying to send MIDI messages over USB from my Nucleo F401re to a multieffects pedal (Zoom B3). Using an arduino with USB host shield I've managed to send program changes, and I'm trying to do the same (and hopefully more) using the F401.

The problem is that when I connect the +5V USB line to PA9 the pedal gets no power. When I connect it to the 5V output on the F401 it does get power, but it won't receive any messages. Also, my mac doesn't recognise the F401 as a MIDI device.

This is the code that I tried:

#include "mbed.h"
#include "USBMIDI.h"

USBMIDI midi;

int main() {             
    while (1) {    
            midi.write(MIDIMessage::ProgramChange(10,1));
            wait(1);
            midi.write(MIDIMessage::ProgramChange(11,1));
            wait(1);
    }
}

It gives the following errors, but it still compiles:

Warning: C4017W: msg may be used before being set in "main.cpp", Line: 10, Col: 11

Warning: C4017W: msg4 may be used before being set in "main.cpp", Line: 10, Col: 11

What is going wrong?

Thanks!

Question relating to:

Last updated: 30 Mar 2014

25 192

Tomas Cerskus / USBDevice

USB device stack with Nucleo F401RE support. NOTE: the default clock config needs to be changed to in order for USB to work. device, Nucleo, USB