Diff: USBHostMIDI/USBHostMIDI.cpp

Revision:

1:ab240722d7ef

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBHostMIDI/USBHostMIDI.cpp	Wed Feb 15 10:49:44 2017 +0100
@@ -0,0 +1,362 @@
+/* Copyright (c) 2014 mbed.org, MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "USBHostMIDI.h"
+
+#if USBHOST_MIDI
+
+#include "dbg.h"
+
+#define SET_LINE_CODING 0x20
+
+USBHostMIDI::USBHostMIDI() {
+    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;
+    sysExBufferPos = 0;
+}
+
+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 *midi;
+    if (bulk_in) {
+        int length = bulk_in->getLengthTransferred();
+        if (bulk_in->getState() == USB_TYPE_IDLE || bulk_in->getState() == USB_TYPE_FREE) {
+            // MIDI event handling
+            for (int i = 0; i < length; i += 4) {
+                if (i + 4 > length) {
+                    // length shortage, ignored.
+                    break;
+                }
+
+                // read each four bytes
+                midi = &buf[i];
+                // process MIDI message
+                // switch by code index number
+                switch (midi[0] & 0xf) {
+                    case 0: // miscellaneous function codes
+                        miscellaneousFunctionCode(midi[1], midi[2], midi[3]);
+                        break;
+                    case 1: // cable events
+                        cableEvent(midi[1], midi[2], midi[3]);
+                        break;
+                    case 2: // two bytes system common messages 
+                        systemCommonTwoBytes(midi[1], midi[2]);
+                        break;
+                    case 3: // three bytes system common messages 
+                        systemCommonThreeBytes(midi[1], midi[2], midi[3]);
+                        break;
+                    case 4: // SysEx starts or continues
+                        sysExBuffer[sysExBufferPos++] = midi[1];
+                        if (sysExBufferPos >= 64) {
+                            systemExclusive(sysExBuffer, sysExBufferPos, true);
+                            sysExBufferPos = 0;
+                        }
+                        sysExBuffer[sysExBufferPos++] = midi[2];
+                        if (sysExBufferPos >= 64) {
+                            systemExclusive(sysExBuffer, sysExBufferPos, true);
+                            sysExBufferPos = 0;
+                        }
+                        sysExBuffer[sysExBufferPos++] = midi[3];
+                        // SysEx continues. don't send
+                        break;
+                    case 5: // SysEx ends with single byte
+                        sysExBuffer[sysExBufferPos++] = midi[1];
+                        systemExclusive(sysExBuffer, sysExBufferPos, false);
+                        sysExBufferPos = 0;
+                        break;
+                    case 6: // SysEx ends with two bytes
+                        sysExBuffer[sysExBufferPos++] = midi[1];
+                        if (sysExBufferPos >= 64) {
+                            systemExclusive(sysExBuffer, sysExBufferPos, true);
+                            sysExBufferPos = 0;
+                        }
+                        sysExBuffer[sysExBufferPos++] = midi[2];
+                        systemExclusive(sysExBuffer, sysExBufferPos, false);
+                        sysExBufferPos = 0;
+                        break;
+                    case 7: // SysEx ends with three bytes
+                        sysExBuffer[sysExBufferPos++] = midi[1];
+                        if (sysExBufferPos >= 64) {
+                            systemExclusive(sysExBuffer, sysExBufferPos, true);
+                            sysExBufferPos = 0;
+                        }
+                        sysExBuffer[sysExBufferPos++] = midi[2];
+                        if (sysExBufferPos >= 64) {
+                            systemExclusive(sysExBuffer, sysExBufferPos, true);
+                            sysExBufferPos = 0;
+                        }
+                        sysExBuffer[sysExBufferPos++] = midi[3];
+                        systemExclusive(sysExBuffer, sysExBufferPos, false);
+                        sysExBufferPos = 0;
+                        break;
+                    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 10:
+                        polyKeyPress(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 13:
+                        channelPressure(midi[1] & 0xf, midi[2]);
+                        break;
+                    case 14:
+                        pitchBend(midi[1] & 0xf, midi[2] | (midi[3] << 7));
+                        break;
+                    case 15:
+                        singleByte(midi[1]);
+                        break;
+                }
+            }
+            
+            // read another message
+            host->bulkRead(dev, bulk_in, buf, size_bulk_in, false);
+        }
+    }
+}
+
+bool USBHostMIDI::sendMidiBuffer(uint8_t data0, uint8_t data1, uint8_t data2, uint8_t data3) {
+    if (bulk_out) {
+        uint8_t midi[4];
+
+        midi[0] = data0;
+        midi[1] = data1;
+        midi[2] = data2;
+        midi[3] = data3;
+        if (host->bulkWrite(dev, bulk_out, (uint8_t *)midi, 4) == USB_TYPE_OK) {
+            return true;
+        }
+    }
+    return false;
+}
+
+bool USBHostMIDI::sendMiscellaneousFunctionCode(uint8_t data1, uint8_t data2, uint8_t data3) {
+    return sendMidiBuffer(0, data1, data2, data3);
+}
+
+bool USBHostMIDI::sendCableEvent(uint8_t data1, uint8_t data2, uint8_t data3) {
+    return sendMidiBuffer(1, data1, data2, data3);
+}
+
+bool USBHostMIDI::sendSystemCommmonTwoBytes(uint8_t data1, uint8_t data2) {
+    return sendMidiBuffer(2, data1, data2, 0);
+}
+
+bool USBHostMIDI::sendSystemCommmonThreeBytes(uint8_t data1, uint8_t data2, uint8_t data3) {
+    return sendMidiBuffer(3, data1, data2, 0);
+}
+
+bool USBHostMIDI::sendSystemExclusive(uint8_t *buffer, int length) {
+    uint8_t midi[64];
+    int midiLength;
+    int midiPos;
+    if (bulk_out) {
+        for (int i = 0; i < length; i += 48) {
+            if (i + 48 >= length) {
+                // contains last data
+                midiLength = (((length - i) + 2) / 3) * 4;
+                for (int pos = i; pos < length; pos += 3) {
+                    midiPos = (pos + 2) / 3 * 4;
+                    if (pos + 3 >= length) {
+                        // last data
+                        switch (pos % 3) {
+                            case 0:
+                                midi[midiPos    ] = 7;
+                                midi[midiPos + 1] = buffer[pos    ];
+                                midi[midiPos + 2] = buffer[pos + 1];
+                                midi[midiPos + 3] = buffer[pos + 2];
+                                break;
+                            case 1:
+                                midi[midiPos    ] = 5;
+                                midi[midiPos + 1] = buffer[pos    ];
+                                midi[midiPos + 2] = 0;
+                                midi[midiPos + 3] = 0;
+                               break;
+                            case 2:
+                                midi[midiPos    ] = 6;
+                                midi[midiPos + 1] = buffer[pos    ];
+                                midi[midiPos + 2] = buffer[pos + 1];
+                                midi[midiPos + 3] = 0;
+                                break;
+                        }
+                    } else {
+                        // has more data
+                        midi[midiPos    ] = 4;
+                        midi[midiPos + 1] = buffer[pos    ];
+                        midi[midiPos + 2] = buffer[pos + 1];
+                        midi[midiPos + 3] = buffer[pos + 2];
+                    }
+                }
+            } else {
+                // has more data
+                midiLength = 64;
+                for (int pos = i; pos < length; pos += 3) {
+                    midiPos = (pos + 2) / 3 * 4;
+                    midi[midiPos    ] = 4;
+                    midi[midiPos + 1] = buffer[pos    ];
+                    midi[midiPos + 2] = buffer[pos + 1];
+                    midi[midiPos + 3] = buffer[pos + 2];
+                }
+            }
+
+            if (host->bulkWrite(dev, bulk_out, (uint8_t *)midi, midiLength) != USB_TYPE_OK) {
+                return false;
+            }
+        }
+        return true;
+    }
+    return false;
+}
+
+bool USBHostMIDI::sendNoteOff(uint8_t channel, uint8_t note, uint8_t velocity) {
+    return sendMidiBuffer(8, channel & 0xf | 0x80, note & 0x7f, velocity & 0x7f);
+}
+
+bool USBHostMIDI::sendNoteOn(uint8_t channel, uint8_t note, uint8_t velocity) {
+    return sendMidiBuffer(9, channel & 0xf | 0x90, note & 0x7f, velocity & 0x7f);
+}
+
+bool USBHostMIDI::sendPolyKeyPress(uint8_t channel, uint8_t note, uint8_t pressure) {
+    return sendMidiBuffer(10, channel & 0xf | 0xa0, note & 0x7f, pressure & 0x7f);
+}
+
+bool USBHostMIDI::sendControlChange(uint8_t channel, uint8_t key, uint8_t value) {
+    return sendMidiBuffer(11, channel & 0xf | 0xb0, key & 0x7f, value & 0x7f);
+}
+
+bool USBHostMIDI::sendProgramChange(uint8_t channel, uint8_t program) {
+    return sendMidiBuffer(12, channel & 0xf | 0xc0, program & 0x7f, 0);
+}
+
+bool USBHostMIDI::sendChannelPressure(uint8_t channel, uint8_t pressure) {
+    return sendMidiBuffer(13, channel & 0xf | 0xd0, pressure & 0x7f, 0);
+}
+
+bool USBHostMIDI::sendPitchBend(uint8_t channel, uint16_t value) {
+    return sendMidiBuffer(14, channel & 0xf | 0xe0, value & 0x7f, (value >> 7) & 0x7f);
+}
+
+bool USBHostMIDI::sendSingleByte(uint8_t data) {
+    return sendMidiBuffer(15, data, 0, 0);
+}
+
+/*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