midi

1 files changed, 291 insertions, 0 deletions

diff --git a/protocol/lufa/midi/midi_device.c b/protocol/lufa/midi/midi_device.c
new file mode 100755
index 000000000..3215a007d
--- /dev/null
+++ b/protocol/lufa/midi/midi_device.c
@@ -0,0 +1,291 @@
+//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_device.h"
+#include "midi.h"
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+//forward declarations, internally used to call the callbacks
+void midi_input_callbacks(MidiDevice * device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2);
+void midi_process_byte(MidiDevice * device, uint8_t input);
+
+void midi_device_init(MidiDevice * device){
+  device->input_state = IDLE;
+  device->input_count = 0;
+  bytequeue_init(&device->input_queue, device->input_queue_data, MIDI_INPUT_QUEUE_LENGTH);
+
+  //three byte funcs
+  device->input_cc_callback = NULL;
+  device->input_noteon_callback = NULL;
+  device->input_noteoff_callback = NULL;
+  device->input_aftertouch_callback = NULL;
+  device->input_pitchbend_callback = NULL;
+  device->input_songposition_callback = NULL;
+
+  //two byte funcs
+  device->input_progchange_callback = NULL;
+  device->input_chanpressure_callback = NULL;
+  device->input_songselect_callback = NULL;
+  device->input_tc_quarterframe_callback = NULL;
+
+  //one byte funcs
+  device->input_realtime_callback = NULL;
+  device->input_tunerequest_callback = NULL;
+
+  //var byte functions
+  device->input_sysex_callback = NULL;
+  device->input_fallthrough_callback = NULL;
+  device->input_catchall_callback = NULL;
+
+  device->pre_input_process_callback = NULL;
+}
+
+void midi_device_input(MidiDevice * device, uint8_t cnt, uint8_t * input) {
+  uint8_t i;
+  for (i = 0; i < cnt; i++)
+    bytequeue_enqueue(&device->input_queue, input[i]);
+}
+
+void midi_device_set_send_func(MidiDevice * device, midi_var_byte_func_t send_func){
+  device->send_func = send_func;
+}
+
+void midi_device_set_pre_input_process_func(MidiDevice * device, midi_no_byte_func_t pre_process_func){
+  device->pre_input_process_callback = pre_process_func;
+}
+
+void midi_device_process(MidiDevice * device) {
+  //call the pre_input_process_callback if there is one
+  if(device->pre_input_process_callback)
+    device->pre_input_process_callback(device);
+
+  //pull stuff off the queue and process
+  byteQueueIndex_t len = bytequeue_length(&device->input_queue);
+  uint16_t i;
+  //TODO limit number of bytes processed?
+  for(i = 0; i < len; i++) {
+    uint8_t val = bytequeue_get(&device->input_queue, 0);
+    midi_process_byte(device, val);
+    bytequeue_remove(&device->input_queue, 1);
+  }
+}
+
+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;
+      }
+    }
+  }
+}
+
+void midi_input_callbacks(MidiDevice * device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
+  //did we end up calling a callback?
+  bool called = false;
+  if (device->input_state == SYSEX_MESSAGE) {
+    if (device->input_sysex_callback) {
+      const uint16_t start = ((cnt - 1) / 3) * 3;
+      const uint8_t length = (cnt - start);
+      uint8_t data[3];
+      data[0] = byte0;
+      data[1] = byte1;
+      data[2] = byte2;
+      device->input_sysex_callback(device, start, length, data);
+      called = true;
+    }
+  } else {
+    switch (cnt) {
+      case 3:
+        {
+          midi_three_byte_func_t func = NULL;
+          switch (byte0 & 0xF0) {
+            case MIDI_CC:
+              func = device->input_cc_callback;
+              break;
+            case MIDI_NOTEON:
+              func = device->input_noteon_callback;
+              break;
+            case MIDI_NOTEOFF:
+              func = device->input_noteoff_callback;
+              break;
+            case MIDI_AFTERTOUCH:
+              func = device->input_aftertouch_callback;
+              break;
+            case MIDI_PITCHBEND:
+              func = device->input_pitchbend_callback;
+              break;
+            case 0xF0:
+              if (byte0 == MIDI_SONGPOSITION)
+                func = device->input_songposition_callback;
+              break;
+            default:
+              break;
+          }
+          if(func) {
+            //mask off the channel for non song position functions
+            if (byte0 == MIDI_SONGPOSITION)
+              func(device, byte0, byte1, byte2);
+            else
+              func(device, byte0 & 0x0F, byte1, byte2);
+            called = true;
+          }
+        }
+        break;
+      case 2:
+        {
+          midi_two_byte_func_t func = NULL;
+          switch (byte0 & 0xF0) {
+            case MIDI_PROGCHANGE:
+              func = device->input_progchange_callback;
+              break;
+            case MIDI_CHANPRESSURE:
+              func = device->input_chanpressure_callback;
+              break;
+            case 0xF0:
+              if (byte0 == MIDI_SONGSELECT)
+                func = device->input_songselect_callback;
+              else if (byte0 == MIDI_TC_QUARTERFRAME)
+                func = device->input_tc_quarterframe_callback;
+              break;
+            default:
+              break;
+          }
+          if(func) {
+            //mask off the channel
+            if (byte0 == MIDI_SONGSELECT || byte0 == MIDI_TC_QUARTERFRAME)
+              func(device, byte0, byte1);
+            else
+              func(device, byte0 & 0x0F, byte1);
+            called = true;
+          }
+        }
+        break;
+      case 1:
+        {
+          midi_one_byte_func_t func = NULL;
+          if (midi_is_realtime(byte0))
+            func = device->input_realtime_callback;
+          else if (byte0 == MIDI_TUNEREQUEST)
+            func = device->input_tunerequest_callback;
+          if (func) {
+            func(device, byte0);
+            called = true;
+          }
+        }
+        break;
+      default:
+        //just in case
+        if (cnt > 3)
+          cnt = 0;
+        break;
+    }
+  }
+
+  //if there is fallthrough default callback and we haven't called a more specific one, 
+  //call the fallthrough
+  if (!called && device->input_fallthrough_callback)
+    device->input_fallthrough_callback(device, cnt, byte0, byte1, byte2);
+  //always call the catch all if it exists
+  if (device->input_catchall_callback)
+    device->input_catchall_callback(device, cnt, byte0, byte1, byte2);
+}
+