midi.cpp

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/**
 * @file midi.cpp
 * @brief USB MIDI device implementation
 *
 * Wraps TinyUSB's MIDI device class for SBL.
 * See midi.hpp for API documentation.
 */
 
#include "tusb.h"
#include <sbl/usb/midi.hpp>
 
namespace sbl::usb {
 
namespace {
 
/// Cable number for our single virtual MIDI cable
constexpr uint8_t CABLE_NUM = 0;
 
/// A USB device has one cable, so one output port
constexpr uint8_t OUT_PORTS = 1;
 
} // anonymous namespace
 
bool MidiPort::connected() {
    return tud_midi_mounted();
}
 
uint32_t MidiPort::read(uint8_t* buf, uint32_t max_len) {
    if (!tud_midi_mounted()) return 0;
    return tud_midi_stream_read(buf, max_len);
}
 
bool MidiPort::send(const sbl::midi::MidiEvent& event, uint8_t port) {
    if (port != 0 || !tud_midi_mounted()) return false;
 
    uint8_t msg[3];
    uint8_t len = event.to_bytes(msg);
    if (len == 0) return false;
 
    return tud_midi_stream_write(CABLE_NUM, msg, len) == len;
}
 
uint32_t MidiPort::write(const uint8_t* data, uint32_t len, uint8_t port) {
    if (port != 0 || !tud_midi_mounted()) return 0;
    return tud_midi_stream_write(CABLE_NUM, data, len);
}
 
uint8_t MidiPort::out_port_count() { return OUT_PORTS; }
 
} // namespace sbl::usb