diff options
Diffstat (limited to 'protocol/lufa/midi/midi_device.c')
| -rwxr-xr-x | protocol/lufa/midi/midi_device.c | 291 |
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); +} + |