@ -24,15 +24,22 @@ static float qMeasurement = 0;
static int32_t volCalibrationBase = 0 ;
static uint16_t old_midi_note = 0 ;
static uint16_t old_midi_volume = 0 ;
static uint16_t old_midi_bend = 0 ;
static double midi_key_follow = 0.5 ;
static uint8_t midi_channel = 0 ;
static uint8_t midi_bend_range = 0 ;
static uint8_t midi_volume_trigger = 0 ;
Application : : Application ( )
: _state ( PLAYING ) ,
_mode ( NORMAL ) {
} ;
void Application : : setup ( ) {
# if SERIAL_ENABLED
Serial . begin ( Application : : BAUD ) ;
# endif
HW_LED1_ON ; HW_LED2_OFF ;
@ -58,7 +65,7 @@ initialiseInterrupts();
EEPROM . get ( 4 , pitchCalibrationBase ) ;
EEPROM . get ( 8 , volCalibrationBase ) ;
midi_setup ( ) ;
}
@ -181,62 +188,73 @@ void Application::loop() {
vWavetableSelector = wavePotValueL > > 7 ;
registerValue = 4 - ( registerPotValueL > > 8 ) ;
if ( _state = = PLAYING & & HW_BUTTON_PRESSED ) {
if ( _state = = PLAYING & & HW_BUTTON_PRESSED )
{
_state = CALIBRATING ;
_midistate = MIDI_STOP ;
resetTimer ( ) ;
}
if ( _state = = CALIBRATING & & HW_BUTTON_RELEASED ) {
if ( timerExpired ( 1500 ) ) {
if ( _state = = CALIBRATING & & HW_BUTTON_RELEASED )
{
if ( timerExpired ( 1500 ) )
{
_mode = nextMode ( ) ;
if ( _mode = = NORMAL ) { HW_LED1_ON ; HW_LED2_OFF ; } else { HW_LED1_OFF ; HW_LED2_ON ; } ;
// playModeSettingSound();
if ( _mode = = NORMAL )
{
HW_LED1_ON ; HW_LED2_OFF ;
_midistate = MIDI_SILENT ;
}
else
{
HW_LED1_OFF ; HW_LED2_ON ;
} ;
// playModeSettingSound();
}
_state = PLAYING ;
} ;
if ( _state = = CALIBRATING & & timerExpired ( 15000 ) ) {
if ( _state = = CALIBRATING & & timerExpired ( 15000 ) )
{
HW_LED2_ON ;
HW_LED2_ON ;
playStartupSound ( ) ;
calibrate_pitch ( ) ;
calibrate_volume ( ) ;
initialiseTimer ( ) ;
initialiseInterrupts ( ) ;
playCalibratingCountdownSound ( ) ;
calibrate ( ) ;
playStartupSound ( ) ;
if ( registerPotValue < 512 ) // if register pot turned CCW
{
// calibrate heterodyne parameters
calibrate_pitch ( ) ;
calibrate_volume ( ) ;
initialiseTimer ( ) ;
initialiseInterrupts ( ) ;
playCalibratingCountdownSound ( ) ;
calibrate ( ) ;
}
else // if register turned CW
{
// calibrate midi parameters
midi_calibrate ( ) ;
} ;
_mode = NORMAL ;
HW_LED2_OFF ;
_mode = NORMAL ;
HW_LED2_OFF ;
while ( HW_BUTTON_PRESSED )
; // NOP
_state = PLAYING ;
_midistate = MIDI_SILENT ;
} ;
# if CV_ENABLED
OCR0A = pitch & 0xff ;
# endif
# if SERIAL_ENABLED
if ( timerExpired ( TICKS_100_MILLIS ) ) {
resetTimer ( ) ;
Serial . write ( pitch & 0xff ) ; // Send char on serial (if used)
Serial . write ( ( pitch > > 8 ) & 0xff ) ;
}
# endif
if ( pitchValueAvailable ) { // If capture event
@ -281,6 +299,12 @@ void Application::loop() {
volumeValueAvailable = false ;
}
if ( midi_timer > 100 ) // run midi app every 100 ticks equivalent to approximatevely 3 ms to avoid synth's overload
{
midi_application ( ) ;
midi_timer = 0 ;
}
goto mloop ; // End of main loop
}
@ -319,8 +343,6 @@ static long pitchfn0 = 0;
static long pitchfn1 = 0 ;
static long pitchfn = 0 ;
Serial . begin ( 115200 ) ;
Serial . println ( " \n PITCH CALIBRATION \n " ) ;
HW_LED1_OFF ;
HW_LED2_ON ;
@ -330,8 +352,6 @@ static long pitchfn = 0;
mcpDacInit ( ) ;
qMeasurement = GetQMeasurement ( ) ; // Measure Arudino clock frequency
Serial . print ( " Arudino Freq: " ) ;
Serial . println ( qMeasurement ) ;
q0 = ( 16000000 / qMeasurement * 500000 ) ; //Calculated set frequency based on Arudino clock frequency
@ -340,8 +360,6 @@ pitchXn1 = 4095;
pitchfn = q0 - PitchFreqOffset ; // Add offset calue to set frequency
Serial . print ( " \n Pitch Set Frequency: " ) ;
Serial . println ( pitchfn ) ;
mcpDac2BSend ( 1600 ) ;
@ -354,11 +372,6 @@ mcpDac2ASend(pitchXn1);
delay ( 100 ) ;
pitchfn1 = GetPitchMeasurement ( ) ;
Serial . print ( " Frequency tuning range: " ) ;
Serial . print ( pitchfn0 ) ;
Serial . print ( " to " ) ;
Serial . println ( pitchfn1 ) ;
while ( abs ( pitchfn0 - pitchfn1 ) > CalibrationTolerance ) { // max allowed pitch frequency offset
@ -372,14 +385,6 @@ pitchfn1 = GetPitchMeasurement()-pitchfn;
pitchXn2 = pitchXn1 - ( ( pitchXn1 - pitchXn0 ) * pitchfn1 ) / ( pitchfn1 - pitchfn0 ) ; // new DAC value
Serial . print ( " \n DAC value L: " ) ;
Serial . print ( pitchXn0 ) ;
Serial . print ( " Freq L: " ) ;
Serial . println ( pitchfn0 ) ;
Serial . print ( " DAC value H: " ) ;
Serial . print ( pitchXn1 ) ;
Serial . print ( " Freq H: " ) ;
Serial . println ( pitchfn1 ) ;
pitchXn0 = pitchXn1 ;
@ -406,8 +411,6 @@ static long volumefn0 = 0;
static long volumefn1 = 0 ;
static long volumefn = 0 ;
Serial . begin ( 115200 ) ;
Serial . println ( " \n VOLUME CALIBRATION " ) ;
InitialiseVolumeMeasurement ( ) ;
interrupts ( ) ;
@ -420,8 +423,6 @@ volumeXn1 = 4095;
q0 = ( 16000000 / qMeasurement * 460765 ) ;
volumefn = q0 - VolumeFreqOffset ;
Serial . print ( " \n Volume Set Frequency: " ) ;
Serial . println ( volumefn ) ;
mcpDac2BSend ( volumeXn0 ) ;
@ -435,11 +436,6 @@ delay_NOP(44316);//44316=100ms
volumefn1 = GetVolumeMeasurement ( ) ;
Serial . print ( " Frequency tuning range: " ) ;
Serial . print ( volumefn0 ) ;
Serial . print ( " to " ) ;
Serial . println ( volumefn1 ) ;
while ( abs ( volumefn0 - volumefn1 ) > CalibrationTolerance ) {
@ -453,14 +449,6 @@ volumefn1 = GetVolumeMeasurement()-volumefn;
volumeXn2 = volumeXn1 - ( ( volumeXn1 - volumeXn0 ) * volumefn1 ) / ( volumefn1 - volumefn0 ) ; // calculate new DAC value
Serial . print ( " \n DAC value L: " ) ;
Serial . print ( volumeXn0 ) ;
Serial . print ( " Freq L: " ) ;
Serial . println ( volumefn0 ) ;
Serial . print ( " DAC value H: " ) ;
Serial . print ( volumeXn1 ) ;
Serial . print ( " Freq H: " ) ;
Serial . println ( volumefn1 ) ;
volumeXn0 = volumeXn1 ;
@ -474,7 +462,6 @@ EEPROM.put(2,volumeXn0);
HW_LED2_OFF ;
HW_LED1_ON ;
Serial . println ( " \n CALIBRATION COMPTLETED \n " ) ;
}
void Application : : hzToAddVal ( float hz ) {
@ -515,4 +502,247 @@ void Application::delay_NOP(unsigned long time) {
void Application : : midi_setup ( )
{
EEPROM . get ( 12 , midi_channel ) ;
EEPROM . get ( 13 , midi_bend_range ) ;
EEPROM . get ( 14 , midi_volume_trigger ) ;
// Set MIDI baud rate:
Serial . begin ( 115200 ) ; // Baudrate for midi to serial. Use a serial to midi router http://projectgus.github.com/hairless-midiserial/
//Serial.begin(31250); // Baudrate for real midi. Use din connection https://www.arduino.cc/en/Tutorial/Midi or HIDUINO https://github.com/ddiakopoulos/hiduino
_midistate = MIDI_SILENT ;
}
void Application : : midi_msg_send ( uint8_t channel , uint8_t midi_cmd1 , uint8_t midi_cmd2 , uint8_t midi_value )
{
uint8_t mixed_cmd1_channel ;
mixed_cmd1_channel = ( midi_cmd1 & 0xF0 ) | ( channel & 0x0F ) ;
Serial . write ( mixed_cmd1_channel ) ;
Serial . write ( midi_cmd2 ) ;
Serial . write ( midi_value ) ;
}
// midi_application sends note and volume and uses pitch bend to simulate continuous picth.
// Calibrate pitch bend and other parameters accordingly to the receiver synth (see midi_calibrate).
// New notes won't be generated as long as pitch bend will do the job.
// The bigger is synth's pitch bend range the beter is the effect.
// If pitch bend range = 1 no picth bend is generated (portamento will do a better job)
void Application : : midi_application ( )
{
uint16_t new_midi_note ;
uint16_t new_midi_volume ;
uint16_t new_midi_bend ;
uint8_t midi_bend_low ;
uint8_t midi_bend_high ;
double double_log_freq ;
double double_log_bend ;
// Calculate volume for midi
new_midi_volume = vScaledVolume > > 1 ;
new_midi_volume = min ( new_midi_volume , 127 ) ;
// Calculate note and pitch bend for midi
if ( vPointerIncrement < 18 )
{
// Highest note
new_midi_note = 0 ;
new_midi_bend = 8192 ;
}
else if ( vPointerIncrement > 26315 )
{
// Lowest note
new_midi_note = 127 ;
new_midi_bend = 8192 ;
}
else
{
// Find note in the playing range
double_log_freq = ( log ( vPointerIncrement / 17.152 ) / 0.057762265 ) ; // Precise note played in the logaritmic scale
double_log_bend = double_log_freq - old_midi_note ; // How far from last played midi chromatic note we are
// If too much far from last midi chromatic note played (midi_key_follow depends on pitch bend range)
if ( abs ( double_log_bend ) > = midi_key_follow )
{
new_midi_note = round ( double_log_freq ) ; // Select the new midi chromatic note
double_log_bend = double_log_freq - new_midi_note ; // calculate bend to reach precise note played
}
else
{
new_midi_note = old_midi_note ; // No change
}
// If pitch bend range greater than 1
if ( midi_bend_range > 1 )
{
// use it to reach precise note played
new_midi_bend = 8192 + ( 8191 * double_log_bend / midi_bend_range ) ; // Calculate midi pitch bend
}
else
{
// Don't use pitch bend (portamento would do a beter job)
new_midi_bend = 8192 ;
}
}
// Prepare the 2 bites of picth bend midi message
midi_bend_low = ( int8_t ) ( new_midi_bend & 0x007F ) ;
midi_bend_high = ( int8_t ) ( ( new_midi_bend & 0x3F80 ) > > 7 ) ;
// State machine for MIDI
switch ( _midistate )
{
case MIDI_SILENT :
// If player's hand moves away from volume antenna
if ( new_midi_volume > midi_volume_trigger )
{
// Send pitch bend to reach precise played note (send 8192 (no pitch bend) in case of midi_bend_range == 1)
midi_msg_send ( midi_channel , 0xE0 , midi_bend_low , midi_bend_high ) ;
old_midi_bend = new_midi_bend ;
// Send volume to reach precise played volume
midi_msg_send ( midi_channel , 0xB0 , 0x07 , new_midi_volume ) ;
old_midi_volume = new_midi_volume ;
// Play the note
midi_msg_send ( midi_channel , 0x90 , new_midi_note , 0x45 ) ;
old_midi_note = new_midi_note ;
// Set key follow so as next played note will be at limit of pitch bend range
midi_key_follow = ( double ) ( midi_bend_range ) - 0.5 ;
_midistate = MIDI_PLAYING ;
}
else
{
// Do nothing
}
break ;
case MIDI_PLAYING :
// If player's hand is far from volume antenna
if ( new_midi_volume > midi_volume_trigger )
{
// Refresh midi pitch bend value
if ( new_midi_bend ! = old_midi_bend )
{
midi_msg_send ( midi_channel , 0xE0 , midi_bend_low , midi_bend_high ) ;
old_midi_bend = new_midi_bend ;
}
else
{
// do nothing
}
// Refresh midi volume value
if ( new_midi_volume ! = old_midi_volume )
{
midi_msg_send ( midi_channel , 0xB0 , 0x07 , new_midi_volume ) ;
old_midi_volume = new_midi_volume ;
}
else
{
// do nothing
}
// Refresh midi note
if ( new_midi_note ! = old_midi_note )
{
// Play new note before muting old one to play legato on monophonic synth
// (pitch pend management tends to break expected effect here)
midi_msg_send ( midi_channel , 0x90 , new_midi_note , 0x45 ) ;
midi_msg_send ( midi_channel , 0x90 , old_midi_note , 0 ) ;
old_midi_note = new_midi_note ;
}
else
{
// do nothing
}
}
else // Means that player's hand moves to the volume antenna
{
// Send volume = 0
midi_msg_send ( midi_channel , 0xB0 , 0x07 , 0 ) ;
old_midi_volume = 0 ;
// Send note off
midi_msg_send ( midi_channel , 0x90 , old_midi_note , 0 ) ;
// Set key follow to the minimum in order to use closest note played as the center note for pitch bend next time
midi_key_follow = 0.5 ;
_midistate = MIDI_SILENT ;
}
break ;
case MIDI_STOP :
// Send all note off
midi_msg_send ( midi_channel , 0xB0 , 0x7B , 0x00 ) ;
_midistate = MIDI_MUTE ;
break ;
case MIDI_MUTE :
//do nothing
break ;
}
}
// midi_calibrate allows the user to set some midi parameters
// Set potentiometer accordingly to comments bellow BEFORE entering in midi calibration mode.
// Hear may help somewhat to determine entered values
void Application : : midi_calibrate ( )
{
uint16_t pot_channel ;
uint16_t pot_bend_range ;
uint16_t pot_volume_trigger ;
uint16_t bend_range_scale ;
// Midi channel uses "Timbre" pot.
// Waveform may help user do determine which couple of channel is chosen (WF 1 Lo -> Ch1, WF 1 Hi -> Ch2, WF 2 Lo -> Ch3, etc...)
pot_channel = analogRead ( WAVE_SELECT_POT ) ;
midi_channel = ( uint8_t ) ( ( pot_channel > > 6 ) & 0x000F ) ;
EEPROM . put ( 12 , midi_channel ) ;
// Pitch bend range and associated distance between notes jumps use "Pitch" pot.
// The user shall set synth's pitch bend range acordingly to the selected Theremin's pitch bend range:
// 1 semitone, 7 semitones (a fifth), 12 semitones (an octave) or 24 semitones (two octaves).
// The "1 semitone" setting blocks pitch bend generation (use portamento on the synth)
pot_bend_range = analogRead ( PITCH_POT ) ;
bend_range_scale = pot_bend_range > > 8 ;
if ( bend_range_scale = = 0 )
{
midi_bend_range = 1 ;
}
else if ( bend_range_scale = = 1 )
{
midi_bend_range = 7 ;
}
else if ( bend_range_scale = = 2 )
{
midi_bend_range = 12 ;
}
else
{
midi_bend_range = 24 ;
}
EEPROM . put ( 13 , midi_bend_range ) ;
// Volume trigger uses "Volume" pot
// Select a high value if some percussive sounds are played (so as it is heard when volume is not null)
pot_volume_trigger = analogRead ( VOLUME_POT ) ;
midi_volume_trigger = ( uint8_t ) ( ( pot_volume_trigger > > 3 ) & 0x007F ) ;
EEPROM . put ( 14 , midi_volume_trigger ) ;
}
MrDham
7 years ago
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