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-rw-r--r--quantum/midi/qmk_midi.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/quantum/midi/qmk_midi.c b/quantum/midi/qmk_midi.c
new file mode 100644
index 0000000000..f6a5d92281
--- /dev/null
+++ b/quantum/midi/qmk_midi.c
@@ -0,0 +1,135 @@
+#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"
+
+/*******************************************************************************
+ * 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);
+}
+
+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);
+}