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#include <LUFA/Drivers/USB/USB.h>
#include "qmk_midi.h"
#include "sysex_tools.h"
#include "midi.h"
#include "usb_descriptor.h"
#include "process_midi.h"
#if API_SYSEX_ENABLE
# include "api.h"
#endif
/*******************************************************************************
* MIDI
******************************************************************************/
MidiDevice midi_device;
#define SYSEX_START_OR_CONT 0x40
#define SYSEX_ENDS_IN_1 0x50
#define SYSEX_ENDS_IN_2 0x60
#define SYSEX_ENDS_IN_3 0x70
#define SYS_COMMON_1 0x50
#define SYS_COMMON_2 0x20
#define SYS_COMMON_3 0x30
static void usb_send_func(MidiDevice* device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
MIDI_EventPacket_t event;
event.Data1 = byte0;
event.Data2 = byte1;
event.Data3 = byte2;
uint8_t cable = 0;
// 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.Event = MIDI_EVENT(cable, SYSEX_ENDS_IN_3);
else
event.Event = MIDI_EVENT(cable, SYSEX_START_OR_CONT);
break;
case 2:
if (byte1 == SYSEX_END)
event.Event = MIDI_EVENT(cable, SYSEX_ENDS_IN_2);
else
event.Event = MIDI_EVENT(cable, SYSEX_START_OR_CONT);
break;
case 1:
if (byte0 == SYSEX_END)
event.Event = MIDI_EVENT(cable, SYSEX_ENDS_IN_1);
else
event.Event = MIDI_EVENT(cable, 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.Event = MIDI_EVENT(cable, SYS_COMMON_3);
break;
case MIDI_SONGSELECT:
case MIDI_TC_QUARTERFRAME:
event.Event = MIDI_EVENT(cable, SYS_COMMON_2);
break;
default:
event.Event = MIDI_EVENT(cable, byte0);
break;
}
}
send_midi_packet(&event);
}
static void usb_get_midi(MidiDevice* device) {
MIDI_EventPacket_t event;
while (recv_midi_packet(&event)) {
midi_packet_length_t length = midi_packet_length(event.Data1);
uint8_t input[3];
input[0] = event.Data1;
input[1] = event.Data2;
input[2] = event.Data3;
if (length == UNDEFINED) {
// sysex
if (event.Event == MIDI_EVENT(0, SYSEX_START_OR_CONT) || event.Event == MIDI_EVENT(0, SYSEX_ENDS_IN_3)) {
length = 3;
} else if (event.Event == MIDI_EVENT(0, SYSEX_ENDS_IN_2)) {
length = 2;
} else if (event.Event == MIDI_EVENT(0, SYSEX_ENDS_IN_1)) {
length = 1;
} else {
// XXX what to do?
}
}
// pass the data to the device input function
if (length != UNDEFINED) midi_device_input(device, length, input);
}
}
static void fallthrough_callback(MidiDevice* device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
#ifdef AUDIO_ENABLE
if (cnt == 3) {
switch (byte0 & 0xF0) {
case MIDI_NOTEON:
play_note(((double)261.6) * pow(2.0, -4.0) * pow(2.0, (byte1 & 0x7F) / 12.0), (byte2 & 0x7F) / 8);
break;
case MIDI_NOTEOFF:
stop_note(((double)261.6) * pow(2.0, -4.0) * pow(2.0, (byte1 & 0x7F) / 12.0));
break;
}
}
if (byte0 == MIDI_STOP) {
stop_all_notes();
}
#endif
}
static void cc_callback(MidiDevice* device, uint8_t chan, uint8_t num, uint8_t val) {
// sending it back on the next channel
// midi_send_cc(device, (chan + 1) % 16, num, val);
}
#ifdef API_SYSEX_ENABLE
uint8_t midi_buffer[MIDI_SYSEX_BUFFER] = {0};
static void sysex_callback(MidiDevice* device, uint16_t start, uint8_t length, uint8_t* data) {
// SEND_STRING("\n");
// send_word(start);
// SEND_STRING(": ");
// Don't store the header
int16_t pos = start - 4;
for (uint8_t place = 0; place < length; place++) {
// send_byte(*data);
if (pos >= 0) {
if (*data == 0xF7) {
// SEND_STRING("\nRD: ");
// for (uint8_t i = 0; i < start + place + 1; i++){
// send_byte(midi_buffer[i]);
// SEND_STRING(" ");
// }
const unsigned decoded_length = sysex_decoded_length(pos);
uint8_t decoded[API_SYSEX_MAX_SIZE];
sysex_decode(decoded, midi_buffer, pos);
process_api(decoded_length, decoded);
return;
} else if (pos >= MIDI_SYSEX_BUFFER) {
return;
}
midi_buffer[pos] = *data;
}
// SEND_STRING(" ");
data++;
pos++;
}
}
#endif
void midi_init(void);
void setup_midi(void) {
#ifdef MIDI_ADVANCED
midi_init();
#endif
midi_device_init(&midi_device);
midi_device_set_send_func(&midi_device, usb_send_func);
midi_device_set_pre_input_process_func(&midi_device, usb_get_midi);
midi_register_fallthrough_callback(&midi_device, fallthrough_callback);
midi_register_cc_callback(&midi_device, cc_callback);
#ifdef API_SYSEX_ENABLE
midi_register_sysex_callback(&midi_device, sysex_callback);
#endif
}
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