usbd-midi ========= A simple usb midi device class for [usb-device](https://crates.io/crates/usb-device). Currently this aims to be a very simple implementation, that allows the micro controller to send MIDI information to the PC and also receive MIDI information. This crate requires the use of a hardware driver, that implements the usb-device traits. ## Example ### Receive MIDI Turn on the integrated LED of a STM32 BluePill board as long as C2 is pressed ```rust fn main() -> ! { let dp = pac::Peripherals::take().unwrap(); let mut rcc = dp.RCC.constrain(); let mut gpioa = dp.GPIOA.split(&mut rcc.apb2); let mut gpioc = dp.GPIOC.split(&mut rcc.apb2); let mut led = gpioc.pc13.into_push_pull_output(&mut gpioc.crh); led.set_high().unwrap(); let mut usb_dp = gpioa.pa12.into_push_pull_output(&mut gpioa.crh); let usb = Peripheral { usb: dp.USB, pin_dm: gpioa.pa11, pin_dp: usb_dp.into_floating_input(&mut gpioa.crh), }; let usb_bus = UsbBus::new(usb); let mut midi = MidiClass::new(&usb_bus); let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x16c0, 0x5e4)) .product("MIDI Test") .device_class(USB_AUDIO_CLASS) .device_sub_class(USB_MIDISTREAMING_SUBCLASS) .build(); loop { if !usb_dev.poll(&mut [&mut midi]) { continue; } let mut buffer = [0; 64]; if let Ok(size) = midi.read(&mut buffer) { let buffer_reader = MidiPacketBufferReader::new(&buffer, size); for packet in buffer_reader.into_iter() { if let Ok(packet) = packet { match packet.message { Message::NoteOn(Channel1, Note::C2, ..) => { led.set_low().unwrap(); }, Message::NoteOff(Channel1, Note::C2, ..) => { led.set_high().unwrap(); }, _ => {} } } } } } } ```