1 files changed, 277 insertions, 0 deletions
diff --git a/tmk_core/protocol/midi/midi.c b/tmk_core/protocol/midi/midi.c
new file mode 100755
index 0000000000..11a589078c
--- /dev/null
+++ b/tmk_core/protocol/midi/midi.c
@@ -0,0 +1,277 @@
+//midi for embedded chips,
+//Copyright 2010 Alex Norman
+//
+//This file is part of avr-midi.
+//
+//avr-midi is free software: you can redistribute it and/or modify
+//it under the terms of the GNU General Public License as published by
+//the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+//avr-midi is distributed in the hope that it will be useful,
+//but WITHOUT ANY WARRANTY; without even the implied warranty of
+//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//GNU General Public License for more details.
+//
+//You should have received a copy of the GNU General Public License
+//along with avr-midi.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "midi.h"
+#include <string.h> //for memcpy
+
+#define MIN(x,y) (((x) < (y)) ? (x) : (y)) 
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+bool midi_is_statusbyte(uint8_t theByte){
+   return (bool)(theByte & MIDI_STATUSMASK);
+}
+
+bool midi_is_realtime(uint8_t theByte){
+   return (theByte >= MIDI_CLOCK);
+}
+
+midi_packet_length_t midi_packet_length(uint8_t status){
+   switch(status & 0xF0){
+      case MIDI_CC:
+      case MIDI_NOTEON:
+      case MIDI_NOTEOFF:
+      case MIDI_AFTERTOUCH:
+      case MIDI_PITCHBEND:
+         return THREE;
+      case MIDI_PROGCHANGE:
+      case MIDI_CHANPRESSURE:
+      case MIDI_SONGSELECT:
+         return TWO;
+      case 0xF0:
+         switch(status) {
+            case MIDI_CLOCK:
+            case MIDI_TICK:
+            case MIDI_START:
+            case MIDI_CONTINUE:
+            case MIDI_STOP:
+            case MIDI_ACTIVESENSE:
+            case MIDI_RESET:
+            case MIDI_TUNEREQUEST:
+               return ONE;
+            case MIDI_SONGPOSITION:
+               return THREE;
+            case MIDI_TC_QUARTERFRAME:
+            case MIDI_SONGSELECT:
+               return TWO;
+            case SYSEX_END:
+            case SYSEX_BEGIN:
+            default:
+               return UNDEFINED;
+         }
+      default:
+         return UNDEFINED;
+   }
+}
+
+void midi_send_cc(MidiDevice * device, uint8_t chan, uint8_t num, uint8_t val){
+   //CC Status: 0xB0 to 0xBF where the low nibble is the MIDI channel.
+   //CC Data: Controller Num, Controller Val
+   device->send_func(device, 3,
+         MIDI_CC | (chan & MIDI_CHANMASK),
+         num & 0x7F,
+         val & 0x7F);
+}
+
+void midi_send_noteon(MidiDevice * device, uint8_t chan, uint8_t num, uint8_t vel){
+   //Note Data: Note Num, Note Velocity
+   device->send_func(device, 3,
+         MIDI_NOTEON | (chan & MIDI_CHANMASK),
+         num & 0x7F,
+         vel & 0x7F);
+}
+
+void midi_send_noteoff(MidiDevice * device, uint8_t chan, uint8_t num, uint8_t vel){
+   //Note Data: Note Num, Note Velocity
+   device->send_func(device, 3,
+         MIDI_NOTEOFF | (chan & MIDI_CHANMASK),
+         num & 0x7F,
+         vel & 0x7F);
+}
+
+void midi_send_aftertouch(MidiDevice * device, uint8_t chan, uint8_t note_num, uint8_t amt){
+   device->send_func(device, 3,
+         MIDI_AFTERTOUCH | (chan & MIDI_CHANMASK),
+         note_num & 0x7F,
+         amt & 0x7F);
+}
+
+//XXX does this work right?
+//amt in range -0x2000, 0x1fff
+//uAmt should be in range..
+//0x0000 to 0x3FFF
+void midi_send_pitchbend(MidiDevice * device, uint8_t chan, int16_t amt){
+   uint16_t uAmt;
+   //check range
+   if(amt > 0x1fff){
+      uAmt = 0x3FFF;
+   } else if(amt < -0x2000){
+      uAmt = 0;
+   } else {
+      uAmt = amt + 0x2000;
+   }
+   device->send_func(device, 3,
+         MIDI_PITCHBEND | (chan & MIDI_CHANMASK),
+         uAmt & 0x7F,
+         (uAmt >> 7) & 0x7F);
+}
+
+void midi_send_programchange(MidiDevice * device, uint8_t chan, uint8_t num){
+   device->send_func(device, 2,
+         MIDI_PROGCHANGE | (chan & MIDI_CHANMASK),
+         num & 0x7F,
+         0);
+}
+
+void midi_send_channelpressure(MidiDevice * device, uint8_t chan, uint8_t amt){
+   device->send_func(device, 2,
+         MIDI_CHANPRESSURE | (chan & MIDI_CHANMASK),
+         amt & 0x7F,
+         0);
+}
+
+void midi_send_clock(MidiDevice * device){
+   device->send_func(device, 1, MIDI_CLOCK, 0, 0);
+}
+
+void midi_send_tick(MidiDevice * device){
+   device->send_func(device, 1, MIDI_TICK, 0, 0);
+}
+
+void midi_send_start(MidiDevice * device){
+   device->send_func(device, 1, MIDI_START, 0, 0);
+}
+
+void midi_send_continue(MidiDevice * device){
+   device->send_func(device, 1, MIDI_CONTINUE, 0, 0);
+}
+
+void midi_send_stop(MidiDevice * device){
+   device->send_func(device, 1, MIDI_STOP, 0, 0);
+}
+
+void midi_send_activesense(MidiDevice * device){
+   device->send_func(device, 1, MIDI_ACTIVESENSE, 0, 0);
+}
+
+void midi_send_reset(MidiDevice * device){
+   device->send_func(device, 1, MIDI_RESET, 0, 0);
+}
+
+void midi_send_tcquarterframe(MidiDevice * device, uint8_t time){
+   device->send_func(device, 2,
+         MIDI_TC_QUARTERFRAME,
+         time & 0x7F,
+         0);
+}
+
+//XXX is this right?
+void midi_send_songposition(MidiDevice * device, uint16_t pos){
+   device->send_func(device, 3,
+         MIDI_SONGPOSITION,
+         pos & 0x7F,
+         (pos >> 7) & 0x7F);
+}
+
+void midi_send_songselect(MidiDevice * device, uint8_t song){
+   device->send_func(device, 2,
+         MIDI_SONGSELECT,
+         song & 0x7F,
+         0);
+}
+
+void midi_send_tunerequest(MidiDevice * device){
+   device->send_func(device, 1, MIDI_TUNEREQUEST, 0, 0);
+}
+
+void midi_send_byte(MidiDevice * device, uint8_t b){
+   device->send_func(device, 1, b, 0, 0);
+}
+
+void midi_send_data(MidiDevice * device, uint16_t count, uint8_t byte0, uint8_t byte1, uint8_t byte2){
+   //ensure that the count passed along is always 3 or lower
+   if (count > 3) {
+      //TODO how to do this correctly?
+   }
+   device->send_func(device, count, byte0, byte1, byte2);
+}
+
+void midi_send_array(MidiDevice * device, uint16_t count, uint8_t * array) {
+  uint16_t i;
+  for (i = 0; i < count; i += 3) {
+    uint8_t b[3] = { 0, 0, 0 };
+    uint16_t to_send = count - i;
+    to_send = (to_send > 3) ? 3 : to_send;
+    memcpy(b, array + i, to_send);
+    midi_send_data(device, to_send, b[0], b[1], b[2]);
+  }
+}
+
+
+void midi_register_cc_callback(MidiDevice * device, midi_three_byte_func_t func){
+   device->input_cc_callback = func;
+}
+
+void midi_register_noteon_callback(MidiDevice * device, midi_three_byte_func_t func){
+   device->input_noteon_callback = func;
+}
+
+void midi_register_noteoff_callback(MidiDevice * device, midi_three_byte_func_t func){
+   device->input_noteoff_callback = func;
+}
+
+void midi_register_aftertouch_callback(MidiDevice * device, midi_three_byte_func_t func){
+   device->input_aftertouch_callback = func;
+}
+
+void midi_register_pitchbend_callback(MidiDevice * device, midi_three_byte_func_t func){
+   device->input_pitchbend_callback = func;
+}
+
+void midi_register_songposition_callback(MidiDevice * device, midi_three_byte_func_t func){
+   device->input_songposition_callback = func;
+}
+
+void midi_register_progchange_callback(MidiDevice * device, midi_two_byte_func_t func) {
+   device->input_progchange_callback = func;
+}
+
+void midi_register_chanpressure_callback(MidiDevice * device, midi_two_byte_func_t func) {
+   device->input_chanpressure_callback = func;
+}
+
+void midi_register_songselect_callback(MidiDevice * device, midi_two_byte_func_t func) {
+   device->input_songselect_callback = func;
+}
+
+void midi_register_tc_quarterframe_callback(MidiDevice * device, midi_two_byte_func_t func) {
+   device->input_tc_quarterframe_callback = func;
+}
+
+void midi_register_realtime_callback(MidiDevice * device, midi_one_byte_func_t func){
+   device->input_realtime_callback = func;
+}
+
+void midi_register_tunerequest_callback(MidiDevice * device, midi_one_byte_func_t func){
+   device->input_tunerequest_callback = func;
+}
+
+void midi_register_sysex_callback(MidiDevice * device, midi_sysex_func_t func) {
+   device->input_sysex_callback = func;
+}
+
+void midi_register_fallthrough_callback(MidiDevice * device, midi_var_byte_func_t func){
+   device->input_fallthrough_callback = func;
+}
+
+void midi_register_catchall_callback(MidiDevice * device, midi_var_byte_func_t func){
+   device->input_catchall_callback = func;
+}
+