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USBMIDI

Topic last updated 06 Apr 2011, by alessandro pocaterra. 0 replies
alessandro pocaterra
06 Apr 2011

Hi. I am playing with USBMIDI and trying to have the Hello World example working (http://mbed.org/cookbook/USBMIDI). It looks like I misunderstood something very important and I cannot get it.

A couple of questions: 1) is the MIDI usb cable direct from mbed to USB PC? I am connecting a peeled USB cable to PC by D-(white), D+ (green) and GND(black). Red is not connected.

2) is it necessary to remove the normal USB cable and power the board using external power?

Both with external power supply and self-powered board, it stops in USBMIDI.CPP constructor. I put some LEDs to check where this happens:

USBMIDI::USBMIDI() {
    led1 = 1;
    usb_init();
    usb_connect();
    led2 = 1;
    while (!usb_configured());  
    led3 = 1;
}

LED1 and LED2 turn on; LED3 is always off: usb_configured() is never true! Some init function not working? Some gross mistake I'm doing?

Thanx for any help Alex