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/* Copyright (c) 2010-2011 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 "stdint.h"
#include "USBMIDI.h"
USBMIDI::USBMIDI(uint16_t vendor_id, uint16_t product_id, uint16_t product_release)
: USBDevice(vendor_id, product_id, product_release), cur_data(0), data_end(true)
{
midi_evt = NULL;
USBDevice::connect();
}
// write plain MIDIMessage that will be converted to USBMidi event packet
void USBMIDI::write(MIDIMessage m) {
// first byte keeped for retro-compatibility
for(int p=1; p < m.length; p+=3) {
uint8_t buf[4];
// Midi message to USBMidi event packet
buf[0]=m.data[1] >> 4;
// SysEx
if(buf[0] == 0xF) {
if((m.length - p) > 3) {
// SysEx start or continue
buf[0]=0x4;
} else {
switch(m.length - p) {
case 1:
// SysEx end with one byte
buf[0]=0x5;
break;
case 2:
// SysEx end with two bytes
buf[0]=0x6;
break;
case 3:
// SysEx end with three bytes
buf[0]=0x7;
break;
}
}
}
buf[1]=m.data[p];
if(p+1 < m.length)
buf[2]=m.data[p+1];
else
buf[2]=0;
if(p+2 < m.length)
buf[3]=m.data[p+2];
else
buf[3]=0;
USBDevice::write(EPBULK_IN, buf, 4, MAX_PACKET_SIZE_EPBULK);
}
}
void USBMIDI::attach(void (*fptr)(MIDIMessage)) {
midi_evt = fptr;
}
bool USBMIDI::EPBULK_OUT_callback() {
uint8_t buf[64];
uint32_t len;
readEP(EPBULK_OUT, buf, &len, 64);
if (midi_evt != NULL) {
for (uint32_t i=0; i<len; i+=4) {
uint8_t data_read;
data_end=true;
switch(buf[i]) {
case 0x2:
// Two-bytes System Common Message - undefined in USBMidi 1.0
data_read=2;
break;
case 0x4:
// SysEx start or continue
data_end=false;
data_read=3;
break;
case 0x5:
// Single-byte System Common Message or SysEx end with one byte
data_read=1;
break;
case 0x6:
// SysEx end with two bytes
data_read=2;
break;
case 0xC:
// Program change
data_read=2;
break;
case 0xD:
// Channel pressure
data_read=2;
break;
case 0xF:
// Single byte
data_read=1;
break;
default:
// Others three-bytes messages
data_read=3;
break;
}
for(uint8_t j=1;j<data_read+1;j++) {
data[cur_data]=buf[i+j];
cur_data++;
}
if(data_end) {
midi_evt(MIDIMessage(data,cur_data));
cur_data=0;
}
}
}
// We reactivate the endpoint to receive next characters
readStart(EPBULK_OUT, MAX_PACKET_SIZE_EPBULK);
return true;
}
// Called in ISR context
// Set configuration. Return false if the
// configuration is not supported.
bool USBMIDI::USBCallback_setConfiguration(uint8_t configuration) {
if (configuration != DEFAULT_CONFIGURATION) {
return false;
}
// Configure endpoints > 0
addEndpoint(EPBULK_IN, MAX_PACKET_SIZE_EPBULK);
addEndpoint(EPBULK_OUT, MAX_PACKET_SIZE_EPBULK);
// We activate the endpoint to be able to receive data
readStart(EPBULK_OUT, MAX_PACKET_SIZE_EPBULK);
return true;
}
uint8_t * USBMIDI::stringIinterfaceDesc() {
static uint8_t stringIinterfaceDescriptor[] = {
0x0c, //bLength
STRING_DESCRIPTOR, //bDescriptorType 0x03
'A',0,'u',0,'d',0,'i',0,'o',0 //bString iInterface - Audio
};
return stringIinterfaceDescriptor;
}
uint8_t * USBMIDI::stringIproductDesc() {
static uint8_t stringIproductDescriptor[] = {
0x16, //bLength
STRING_DESCRIPTOR, //bDescriptorType 0x03
'M',0,'b',0,'e',0,'d',0,' ',0,'A',0,'u',0,'d',0,'i',0,'o',0 //bString iProduct - Mbed Audio
};
return stringIproductDescriptor;
}
uint8_t * USBMIDI::configurationDesc() {
static uint8_t configDescriptor[] = {
// configuration descriptor
0x09, 0x02, 0x65, 0x00, 0x02, 0x01, 0x00, 0xc0, 0x50,
// The Audio Interface Collection
0x09, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00, 0x00, // Standard AC Interface Descriptor
0x09, 0x24, 0x01, 0x00, 0x01, 0x09, 0x00, 0x01, 0x01, // Class-specific AC Interface Descriptor
0x09, 0x04, 0x01, 0x00, 0x02, 0x01, 0x03, 0x00, 0x00, // MIDIStreaming Interface Descriptors
0x07, 0x24, 0x01, 0x00, 0x01, 0x41, 0x00, // Class-Specific MS Interface Header Descriptor
// MIDI IN JACKS
0x06, 0x24, 0x02, 0x01, 0x01, 0x00,
0x06, 0x24, 0x02, 0x02, 0x02, 0x00,
// MIDI OUT JACKS
0x09, 0x24, 0x03, 0x01, 0x03, 0x01, 0x02, 0x01, 0x00,
0x09, 0x24, 0x03, 0x02, 0x06, 0x01, 0x01, 0x01, 0x00,
// OUT endpoint descriptor
0x09, 0x05, 0x02, 0x02, 0x40, 0x00, 0x00, 0x00, 0x00,
0x05, 0x25, 0x01, 0x01, 0x01,
// IN endpoint descriptor
0x09, 0x05, 0x82, 0x02, 0x40, 0x00, 0x00, 0x00, 0x00,
0x05, 0x25, 0x01, 0x01, 0x03,
};
return configDescriptor;
}
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