File content as of revision 18:bac56d0365e1:

/* USBHostMidi library
 * Originaled by k.shoji
 * porting by Takuya Urakawa
 */

/* mbed USBHost Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "USBHostMIDI.h"

#if USBHOST_MIDI

#include "dbg.h"

#define SET_LINE_CODING 0x20

USBHostMIDI::USBHostMIDI(): circ_buf() {
    host = USBHost::getHostInst();
    size_bulk_in = 0;
    size_bulk_out = 0;
    init();
}

void USBHostMIDI::init() {
    dev = NULL;
    bulk_in = NULL;
    bulk_out = NULL;
    dev_connected = false;
    midi_intf = -1;
    midi_device_found = false;
    circ_buf.flush();
}

bool USBHostMIDI::connected()
{
    return dev_connected;
}

bool USBHostMIDI::connect() {

    if (dev_connected) {
        return true;
    }
    for (uint8_t i = 0; i < MAX_DEVICE_CONNECTED; i++) {
        if ((dev = host->getDevice(i)) != NULL) {
            
            USB_DBG("Trying to connect MIDI device\r\n");

            if(host->enumerate(dev, this))
                break;
            
            if (midi_device_found) {
                bulk_in = dev->getEndpoint(midi_intf, BULK_ENDPOINT, IN);
                bulk_out = dev->getEndpoint(midi_intf, BULK_ENDPOINT, OUT);
                
                if (!bulk_in || !bulk_out)
                    break;
                
                USB_INFO("New MIDI device: VID:%04x PID:%04x [dev: %p - intf: %d]", dev->getVid(), dev->getPid(), dev, midi_intf);
                dev->setName("MIDI", midi_intf);
                host->registerDriver(dev, midi_intf, this, &USBHostMIDI::init);
                
                size_bulk_in = bulk_in->getSize();
                size_bulk_out = bulk_out->getSize();
                
                bulk_in->attach(this, &USBHostMIDI::rxHandler);
                
                host->bulkRead(dev, bulk_in, buf, size_bulk_in, false);
                dev_connected = true;
                return true;
            }
        }
    }
    init();
    return false;
}

void USBHostMIDI::rxHandler() {
    uint8_t pos = 0;
    uint8_t midi[4];
    if (bulk_in) {
        int len = bulk_in->getLengthTransferred();
        if (bulk_in->getState() == USB_TYPE_IDLE || bulk_in->getState() == USB_TYPE_FREE) {
            for (int i = 0; i < len; i++) {
                circ_buf.queue(buf[i]);
            }
            
            // MIDI event handling
            while (!circ_buf.isEmpty()) {
                // read each four bytes
                circ_buf.dequeue(&midi[pos++]);
                if (pos == 4) {
                    pos = 0;

                    // process MIDI message
                    // switch by code index number
                    switch (midi[0] & 0xf) {
                        case 8:
                            noteOff(midi[1] & 0xf, midi[2], midi[3]);
                            break;
                        case 9:
                            if (midi[3]) {
                                noteOn(midi[1] & 0xf, midi[2], midi[3]);
                            } else {
                                noteOff(midi[1] & 0xf, midi[2], midi[3]);
                            }
                            break;
                        case 11:
                            controlChange(midi[1] & 0xf, midi[2], midi[3]);
                            break;
                        case 12:
                            programChange(midi[1] & 0xf, midi[2]);
                            break;
                        case 14:
                            pitchBend(midi[1] & 0xf, midi[2] | (midi[3] << 7));
                            break;
                        default:
                            break;
                    }
                }
            }
            
            host->bulkRead(dev, bulk_in, buf, size_bulk_in, false);
        }
    }
}

int USBHostMIDI::sendNoteOn(unsigned char channel, unsigned char note, unsigned char velocity) {
    uint8_t midi[4];

    if (bulk_out) {
        midi[0] = 9;
        midi[1] = channel & 0xf;
        midi[2] = note & 0x7f;
        midi[3] = velocity & 0x7f;
        if (host->bulkWrite(dev, bulk_out, (uint8_t *)midi, 4) == USB_TYPE_OK) {
            return 1;
        }
    }
    return -1;
}

int USBHostMIDI::sendNoteOff(unsigned char channel, unsigned char note, unsigned char velocity) {
    uint8_t midi[4];

    if (bulk_out) {
        midi[0] = 8;
        midi[1] = channel & 0xf;
        midi[2] = note & 0x7f;
        midi[3] = velocity & 0x7f;
        if (host->bulkWrite(dev, bulk_out, (uint8_t *)midi, 4) == USB_TYPE_OK) {
            return 1;
        }
    }
    return -1;
}

int USBHostMIDI::sendControlChange(unsigned char channel, unsigned char key, unsigned char value) {
    uint8_t midi[4];

    if (bulk_out) {
        midi[0] = 11;
        midi[1] = channel & 0xf;
        midi[2] = key & 0x7f;
        midi[3] = value & 0x7f;
        if (host->bulkWrite(dev, bulk_out, (uint8_t *)midi, 4) == USB_TYPE_OK) {
            return 1;
        }
    }
    return -1;
}

int USBHostMIDI::sendProgramChange(unsigned char channel, unsigned char program) {
    uint8_t midi[4];

    if (bulk_out) {
        midi[0] = 12;
        midi[1] = channel & 0xf;
        midi[2] = program & 0x7f;
        midi[3] = 0;
        if (host->bulkWrite(dev, bulk_out, (uint8_t *)midi, 4) == USB_TYPE_OK) {
            return 1;
        }
    }
    return -1;
}

int USBHostMIDI::sendPitchBend(unsigned char channel, unsigned int value) {
    uint8_t midi[4];

    if (bulk_out) {
        midi[0] = 14;
        midi[1] = channel & 0xf;
        midi[2] = value & 0x7f;
        midi[3] = (value >> 7) & 0x7f;
        if (host->bulkWrite(dev, bulk_out, (uint8_t *)midi, 4) == USB_TYPE_OK) {
            return 1;
        }
    }
    return -1;
}

void USBHostMIDI::poll()
{
    host->poll();
}

/*virtual*/ void USBHostMIDI::setVidPid(uint16_t vid, uint16_t pid)
{
    // we don't check VID/PID for this driver
}

/*virtual*/ bool USBHostMIDI::parseInterface(uint8_t intf_nb, uint8_t intf_class, uint8_t intf_subclass, uint8_t intf_protocol) //Must return true if the interface should be parsed
{
    // USB MIDI class/subclass
    if ((midi_intf == -1) &&
        (intf_class == AUDIO_CLASS) &&
        (intf_subclass == 0x03)) {
        midi_intf = intf_nb;
        return true;
    }
    
    // vendor specific device
    if ((midi_intf == -1) &&
        (intf_class == 0xff) &&
        (intf_subclass == 0x03)) {
        midi_intf = intf_nb;
        return true;
    }
    
    return false;
}

/*virtual*/ bool USBHostMIDI::useEndpoint(uint8_t intf_nb, ENDPOINT_TYPE type, ENDPOINT_DIRECTION dir) //Must return true if the endpoint will be used
{
    if (intf_nb == midi_intf) {
        if (type == BULK_ENDPOINT) {
            midi_device_found = true;
            return true;
        }
    }
    return false;
}

#endif