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OpenTheremin_V3_with_MIDI
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MrDham 7 years ago committed by GitHub
parent 51520927e7
commit a309ab3fab
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2 changed files with 859 additions and 801 deletions
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  1. 184
      Open_Theremin_V3/application.cpp
  2. 2
      Open_Theremin_V3/application.h

184
Open_Theremin_V3/application.cpp
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@ -24,15 +24,24 @@ static float qMeasurement = 0;
static int32_t volCalibrationBase = 0;
static uint16_t new_midi_note =0;
static uint16_t old_midi_note =0;
static uint16_t new_midi_volume =0;
static uint16_t old_midi_volume =0;
static uint16_t new_midi_bend =0;
static uint16_t old_midi_bend = 0;
static uint8_t midi_bend_low;
static uint8_t midi_bend_high;
static double midi_key_follow = 0.5;
static uint8_t midi_channel = 0;
static uint8_t old_midi_channel = 0;
static uint8_t midi_bend_range = 0;
static uint8_t midi_volume_trigger = 0;
static uint8_t flag_legato_on = 1;
static uint8_t flag_pitch_bend_on = 1;
uint8_t registerValue = 0;
@ -70,7 +79,7 @@ initialiseInterrupts();
EEPROM.get(4,pitchCalibrationBase);
EEPROM.get(8,volCalibrationBase);
init_parameters ();
init_parameters();
midi_setup();
}
@ -514,13 +523,6 @@ void Application::midi_msg_send(uint8_t channel, uint8_t midi_cmd1, uint8_t midi
// 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;
@ -528,53 +530,6 @@ void Application::midi_application ()
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)
{
@ -598,6 +553,12 @@ void Application::midi_application ()
// If player's hand moves away from volume antenna
if (new_midi_volume > midi_volume_trigger)
{
// Set key follow to the minimum in order to use closest note played as the center note
midi_key_follow = 0.5;
// Calculate note and associated pitch bend
calculate_note_bend ();
// 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;
@ -606,9 +567,6 @@ void Application::midi_application ()
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) - 0.2;
_midistate = MIDI_PLAYING;
}
else
@ -632,6 +590,20 @@ void Application::midi_application ()
// If player's hand is far from volume antenna
if (new_midi_volume > midi_volume_trigger)
{
if ( flag_legato_on == 1)
{
// Set key follow so as next played note will be at limit of pitch bend range
midi_key_follow = (double)(midi_bend_range) - 0.2;
}
else
{
// Set key follow to max so as no key follows
midi_key_follow = 127;
}
// Calculate note and associated pitch bend
calculate_note_bend ();
// Refresh midi pitch bend value
if (new_midi_bend != old_midi_bend)
{
@ -662,9 +634,6 @@ void Application::midi_application ()
// 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;
@ -687,6 +656,71 @@ void Application::midi_application ()
}
}
void Application::calculate_note_bend ()
{
double double_log_freq;
double double_log_bend;
double double_norm_log_bend;
// Calculate log freq
if (vPointerIncrement < 18)
{
// Highest note
double_log_freq = 0;
}
else if (vPointerIncrement > 26315)
{
// Lowest note
double_log_freq = 127;
}
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) && (midi_key_follow != 127))
{
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 activated
if (flag_pitch_bend_on == 1)
{
// use it to reach precise note played
double_norm_log_bend = (double_log_bend / midi_bend_range);
if (double_norm_log_bend > 1)
{
double_norm_log_bend = 1;
}
else if (double_norm_log_bend < -1)
{
double_norm_log_bend = -1;
}
new_midi_bend = 8192 + (8191 * double_norm_log_bend); // Calculate midi pitch bend
}
else
{
// Don't use pitch bend
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);
}
void Application::init_parameters ()
{
@ -695,17 +729,19 @@ void Application::init_parameters ()
old_data_pot_value = data_pot_value;
// Transpose
registerValue=4;
registerValue = 4;
// Audio, Audio+Midi, MIDI
// Waveform
vWavetableSelector=0;
vWavetableSelector = 0;
// Channel
midi_channel = 0;
// Rod antenna mode
flag_legato_on = 1;
flag_pitch_bend_on = 1;
// Pitch bend range
midi_bend_range = 2;
@ -758,6 +794,28 @@ void Application::set_parameters ()
case 4:
// Rod antenna mode
switch (data_pot_value >> 7)
{
case 0:
case 1:
flag_legato_on = 0;
flag_pitch_bend_on = 0;
break;
case 2:
case 3:
flag_legato_on = 0;
flag_pitch_bend_on = 1;
break;
case 4:
case 5:
flag_legato_on = 1;
flag_pitch_bend_on = 0;
break;
default:
flag_legato_on = 1;
flag_pitch_bend_on = 1;
break;
}
break;
case 5:

2
Open_Theremin_V3/application.h
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@ -67,7 +67,7 @@ class Application {
void midi_setup();
void midi_msg_send(uint8_t channel, uint8_t midi_cmd1, uint8_t midi_cmd2, uint8_t midi_value);
void midi_application ();
void calculate_note_bend ();
void init_parameters ();
void set_parameters ();

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