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-rwxr-xr-xprotocol/lufa/midi/midi_device.c291
1 files changed, 291 insertions, 0 deletions
diff --git a/protocol/lufa/midi/midi_device.c b/protocol/lufa/midi/midi_device.c
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+//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);
+}
+