void usb_send_func(MidiDevice * device, uint8_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
MIDI_EventPacket_t event;
event.CableNumber = 0;
event.Data1 = byte0;
event.Data2 = byte1;
event.Data3 = byte2;
//if the length is undefined we assume it is a SYSEX message
if (midi_packet_length(byte0) == UNDEFINED) {
switch(cnt) {
case 3:
if (byte2 == SYSEX_END)
event.Command = SYSEX_ENDS_IN_3;
else
event.Command = SYSEX_START_OR_CONT;
break;
case 2:
if (byte1 == SYSEX_END)
event.Command = SYSEX_ENDS_IN_2;
else
event.Command = SYSEX_START_OR_CONT;
break;
case 1:
if (byte0 == SYSEX_END)
event.Command = SYSEX_ENDS_IN_1;
else
event.Command = SYSEX_START_OR_CONT;
break;
default:
return; //invalid cnt
}
} else {
//deal with 'system common' messages
//TODO are there any more?
switch(byte0 & 0xF0){
case MIDI_SONGPOSITION:
event.Command = SYS_COMMON_3;
break;
case MIDI_SONGSELECT:
case MIDI_TC_QUATERFRAME:
event.Command = SYS_COMMON_2;
break;
default:
event.Command = byte0 >> 4;
break;
}
}
MIDI_Device_SendEventPacket(&USB_MIDI_Interface, &event);
MIDI_Device_Flush(&USB_MIDI_Interface);
MIDI_Device_USBTask(&USB_MIDI_Interface);
USB_USBTask();
}
void usb_get_midi(MidiDevice * device) {
/* Select the MIDI OUT stream */
Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPNUM);
MIDI_EventPacket_t event;
while (MIDI_Device_ReceiveEventPacket(&USB_MIDI_Interface, &event)) {
midi_packet_length_t length = midi_packet_length(event.Data1);
//pass the data to the device input function
//not dealing with sysex yet
if (length != UNDEFINED)
midi_device_input(device, length, event.Data1, event.Data2, event.Data3);
}
MIDI_Device_USBTask(&USB_MIDI_Interface);
USB_USBTask();
}
void usb_get_midi(MidiDevice * device) {
MIDI_EventPacket_t event;
while (MIDI_Device_ReceiveEventPacket(&USB_MIDI_Interface, &event)) {
midi_packet_length_t length = midi_packet_length(event.Data1);
//pass the data to the device input function
//not dealing with sysex yet
if (length != UNDEFINED) {
uint8_t input[3];
input[0] = event.Data1;
input[1] = event.Data2;
input[2] = event.Data3;
midi_device_input(device, length, input);
}
}
MIDI_Device_USBTask(&USB_MIDI_Interface);
USB_USBTask();
}
void midi_process_byte(MidiDevice * device, uint8_t input) {
if (midi_is_realtime(input)) {
//call callback, store and restore state
input_state_t state = device->input_state;
device->input_state = ONE_BYTE_MESSAGE;
midi_input_callbacks(device, 1, input, 0, 0);
device->input_state = state;
} else if (midi_is_statusbyte(input)) {
//store the byte
if (device->input_state != SYSEX_MESSAGE) {
device->input_buffer[0] = input;
device->input_count = 1;
}
switch (midi_packet_length(input)) {
case ONE:
device->input_state = ONE_BYTE_MESSAGE;;
midi_input_callbacks(device, 1, input, 0, 0);
device->input_state = IDLE;
break;
case TWO:
device->input_state = TWO_BYTE_MESSAGE;
break;
case THREE:
device->input_state = THREE_BYTE_MESSAGE;
break;
case UNDEFINED:
switch(input) {
case SYSEX_BEGIN:
device->input_state = SYSEX_MESSAGE;
device->input_buffer[0] = input;
device->input_count = 1;
break;
case SYSEX_END:
//send what is left in the input buffer, set idle
device->input_buffer[device->input_count % 3] = input;
device->input_count += 1;
//call the callback
midi_input_callbacks(device, device->input_count,
device->input_buffer[0], device->input_buffer[1], device->input_buffer[2]);
device->input_state = IDLE;
break;
default:
device->input_state = IDLE;
device->input_count = 0;
}
break;
default:
device->input_state = IDLE;
device->input_count = 0;
break;
}
} else {
if (device->input_state != IDLE) {
//store the byte
device->input_buffer[device->input_count % 3] = input;
//increment count
uint16_t prev = device->input_count;
device->input_count += 1;
switch(prev % 3) {
case 2:
//call callback
midi_input_callbacks(device, device->input_count,
device->input_buffer[0], device->input_buffer[1], device->input_buffer[2]);
if (device->input_state != SYSEX_MESSAGE) {
//set to 1, keeping status byte, allowing for running status
device->input_count = 1;
}
break;
case 1:
if (device->input_state == TWO_BYTE_MESSAGE) {
//call callback
midi_input_callbacks(device, device->input_count,
device->input_buffer[0], device->input_buffer[1], 0);
if (device->input_state != SYSEX_MESSAGE) {
//set to 1, keeping status byte, allowing for running status
device->input_count = 1;
}
}
break;
case 0:
default:
//one byte messages are dealt with directly
break;
}
}
}
}