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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.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; }
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