140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
#include <LUFA/Drivers/USB/USB.h>
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#include "qmk_midi.h"
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#include "sysex_tools.h"
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#include "midi.h"
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#include "usb_descriptor.h"
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#include "process_midi.h"
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#ifdef AUDIO_ENABLE
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# include "audio.h"
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# include <math.h>
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#endif
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/*******************************************************************************
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* MIDI
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******************************************************************************/
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MidiDevice midi_device;
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#define SYSEX_START_OR_CONT 0x40
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#define SYSEX_ENDS_IN_1 0x50
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#define SYSEX_ENDS_IN_2 0x60
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#define SYSEX_ENDS_IN_3 0x70
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#define SYS_COMMON_1 0x50
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#define SYS_COMMON_2 0x20
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#define SYS_COMMON_3 0x30
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static void usb_send_func(MidiDevice* device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
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MIDI_EventPacket_t event;
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event.Data1 = byte0;
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event.Data2 = byte1;
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event.Data3 = byte2;
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uint8_t cable = 0;
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// if the length is undefined we assume it is a SYSEX message
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if (midi_packet_length(byte0) == UNDEFINED) {
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switch (cnt) {
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case 3:
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if (byte2 == SYSEX_END)
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event.Event = MIDI_EVENT(cable, SYSEX_ENDS_IN_3);
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else
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event.Event = MIDI_EVENT(cable, SYSEX_START_OR_CONT);
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break;
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case 2:
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if (byte1 == SYSEX_END)
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event.Event = MIDI_EVENT(cable, SYSEX_ENDS_IN_2);
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else
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event.Event = MIDI_EVENT(cable, SYSEX_START_OR_CONT);
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break;
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case 1:
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if (byte0 == SYSEX_END)
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event.Event = MIDI_EVENT(cable, SYSEX_ENDS_IN_1);
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else
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event.Event = MIDI_EVENT(cable, SYSEX_START_OR_CONT);
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break;
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default:
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return; // invalid cnt
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}
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} else {
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// deal with 'system common' messages
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// TODO are there any more?
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switch (byte0 & 0xF0) {
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case MIDI_SONGPOSITION:
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event.Event = MIDI_EVENT(cable, SYS_COMMON_3);
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break;
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case MIDI_SONGSELECT:
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case MIDI_TC_QUARTERFRAME:
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event.Event = MIDI_EVENT(cable, SYS_COMMON_2);
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break;
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default:
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event.Event = MIDI_EVENT(cable, byte0);
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break;
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}
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}
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send_midi_packet(&event);
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}
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static void usb_get_midi(MidiDevice* device) {
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MIDI_EventPacket_t event;
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while (recv_midi_packet(&event)) {
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midi_packet_length_t length = midi_packet_length(event.Data1);
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uint8_t input[3];
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input[0] = event.Data1;
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input[1] = event.Data2;
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input[2] = event.Data3;
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if (length == UNDEFINED) {
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// sysex
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if (event.Event == MIDI_EVENT(0, SYSEX_START_OR_CONT) || event.Event == MIDI_EVENT(0, SYSEX_ENDS_IN_3)) {
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length = 3;
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} else if (event.Event == MIDI_EVENT(0, SYSEX_ENDS_IN_2)) {
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length = 2;
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} else if (event.Event == MIDI_EVENT(0, SYSEX_ENDS_IN_1)) {
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length = 1;
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} else {
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// XXX what to do?
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}
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}
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// pass the data to the device input function
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if (length != UNDEFINED) midi_device_input(device, length, input);
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}
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}
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static void fallthrough_callback(MidiDevice* device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
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#ifdef AUDIO_ENABLE
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if (cnt == 3) {
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switch (byte0 & 0xF0) {
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case MIDI_NOTEON:
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play_note(((double)261.6) * pow(2.0, -4.0) * pow(2.0, (byte1 & 0x7F) / 12.0), (byte2 & 0x7F) / 8);
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break;
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case MIDI_NOTEOFF:
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stop_note(((double)261.6) * pow(2.0, -4.0) * pow(2.0, (byte1 & 0x7F) / 12.0));
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break;
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}
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}
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if (byte0 == MIDI_STOP) {
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stop_all_notes();
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}
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#endif
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}
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static void cc_callback(MidiDevice* device, uint8_t chan, uint8_t num, uint8_t val) {
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// sending it back on the next channel
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// midi_send_cc(device, (chan + 1) % 16, num, val);
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}
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void midi_init(void);
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void setup_midi(void) {
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#ifdef MIDI_ADVANCED
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midi_init();
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#endif
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midi_device_init(&midi_device);
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midi_device_set_send_func(&midi_device, usb_send_func);
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midi_device_set_pre_input_process_func(&midi_device, usb_get_midi);
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midi_register_fallthrough_callback(&midi_device, fallthrough_callback);
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midi_register_cc_callback(&midi_device, cc_callback);
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}
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