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40_IRQ.ino
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void irq_handler(void) { //
SetAUDIO(); // in 20_hardware.ino
/*
skip_counter--; // 1Mhz to 985250HZ difference. Is it needed?
if (skip_counter == 0) {
skip_counter = skip_counter_max;
return;
}
*/
VIC_irq = VIC_irq + multiplier;
if (VIC_irq >= SID_speed) {
VIC_irq_request = 1;
VIC_irq = 0;
}
tune_play_counter = tune_play_counter + multiplier;
if (tune_play_counter >= tune_end_counter) {
change_tune = true;
player = false;
}
if ( player == true ) { // not when loading
SID_emulator();
}
STAD4XX = 0;
}
inline void SID_emulator() {
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Magic
//
///////////////////////////////////
OSC_MSB_Previous_1 = OSC_MSB_1;
OSC_MSB_Previous_2 = OSC_MSB_2;
OSC_MSB_Previous_3 = OSC_MSB_3;
OSC_1 = ((!test_bit_voice_1) & 1) * ((OSC_1 + ( multiplier * OSC_1_HiLo)) ) & 0xffffff;
OSC_2 = ((!test_bit_voice_2) & 1) * ((OSC_2 + ( multiplier * OSC_2_HiLo)) ) & 0xffffff;
OSC_3 = ((!test_bit_voice_3) & 1) * ((OSC_3 + ( multiplier * OSC_3_HiLo)) ) & 0xffffff;
// noise_1
OSC_noise_1 = OSC_noise_1 + multiplier * OSC_1_HiLo;
OSC_bit19_1 = OSC_noise_1 >> 19 ;
for (i = 0; i < OSC_bit19_1; i++) {
bit_0_1 = (( bitRead(pseudorandom_1, 22) ) ^ ((bitRead(pseudorandom_1, 17 ) ) ) ) & 0x1;
pseudorandom_1 = pseudorandom_1 << 1;
//pseudorandom_1 = pseudorandom_1 & 0x7fffff;
pseudorandom_1 = bit_0_1 | pseudorandom_1;
}
OSC_noise_1 = OSC_noise_1 - (OSC_bit19_1 << 19);
// noise_2
OSC_noise_2 = OSC_noise_2 + multiplier * OSC_2_HiLo;
OSC_bit19_2 = OSC_noise_2 >> 19 ;
for (i = 0; i < OSC_bit19_2; i++) {
bit_0_2 = (( bitRead(pseudorandom_2, 22) ) ^ ((bitRead(pseudorandom_2, 17 ) ) ) ) & 0x1;
pseudorandom_2 = pseudorandom_2 << 1;
//pseudorandom_2 = pseudorandom_2 & 0x7fffff;
pseudorandom_2 = bit_0_2 | pseudorandom_2;
}
OSC_noise_2 = OSC_noise_2 - (OSC_bit19_2 << 19) ;
// noise_3
OSC_noise_3 = OSC_noise_3 + multiplier * OSC_3_HiLo;
OSC_bit19_3 = OSC_noise_3 >> 19 ;
for (i = 0; i < OSC_bit19_3; i++) {
bit_0_3 = (( bitRead(pseudorandom_3, 22) ) ^ ((bitRead(pseudorandom_3, 17 ) ) ) ) & 0x1;
pseudorandom_3 = pseudorandom_3 << 1;
//pseudorandom_3 = pseudorandom_3 & 0x7fffff;
pseudorandom_3 = bit_0_3 | pseudorandom_3;
}
OSC_noise_3 = OSC_noise_3 - (OSC_bit19_3 << 19 );
if (OSC_1 >= 0x800000) OSC_MSB_1 = 1; else OSC_MSB_1 = 0;
if ( (!OSC_MSB_Previous_1) & (OSC_MSB_1)) MSB_Rising_1 = 1; else MSB_Rising_1 = 0;
if (OSC_2 >= 0x800000) OSC_MSB_2 = 1; else OSC_MSB_2 = 0;
if ( (!OSC_MSB_Previous_2) & (OSC_MSB_2)) MSB_Rising_2 = 1; else MSB_Rising_2 = 0;
if (OSC_3 >= 0x800000) OSC_MSB_3 = 1; else OSC_MSB_3 = 0;
if ( (!OSC_MSB_Previous_3) & (OSC_MSB_3)) MSB_Rising_3 = 1; else MSB_Rising_3 = 0;
if (SYNC_bit_voice_1 & MSB_Rising_3) OSC_1 = OSC_1 & 0x7fffff;
if (SYNC_bit_voice_2 & MSB_Rising_1) OSC_2 = OSC_2 & 0x7fffff;
if (SYNC_bit_voice_3 & MSB_Rising_2) OSC_3 = OSC_3 & 0x7fffff;
if ( (triangle_bit_voice_1) & (ring_bit_voice_1) ) OSC_MSB_1 = OSC_MSB_1 ^ OSC_MSB_3;
if ( (triangle_bit_voice_2) & (ring_bit_voice_2) ) OSC_MSB_2 = OSC_MSB_2 ^ OSC_MSB_1;
if ( (triangle_bit_voice_3) & (ring_bit_voice_3) ) OSC_MSB_3 = OSC_MSB_3 ^ OSC_MSB_2;
waveform_switch_1 = (noise_bit_voice_1 << 3) | (pulse_bit_voice_1 << 2) | (sawtooth_bit_voice_1 << 1) | (triangle_bit_voice_1);
waveform_switch_2 = (noise_bit_voice_2 << 3) | (pulse_bit_voice_2 << 2) | (sawtooth_bit_voice_2 << 1) | (triangle_bit_voice_2);
waveform_switch_3 = (noise_bit_voice_3 << 3) | (pulse_bit_voice_3 << 2) | (sawtooth_bit_voice_3 << 1) | (triangle_bit_voice_3);
temp11 = (OSC_1 >> 12);
switch (waveform_switch_1) {
case 0:
WaveformDA_1 = 0;
break;
case 1:
WaveformDA_triangle_1 = (( (OSC_MSB_1 * B2047) ^ (temp11 & B2047)) << 1) ;
WaveformDA_1 = WaveformDA_triangle_1;
break;
case 2:
WaveformDA_sawtooth_1 = temp11;
WaveformDA_1 = WaveformDA_sawtooth_1;
break;
case 3:
WaveformDA_triangle_1 = (( (OSC_MSB_1 * B2047) ^ (temp11 & B2047)) << 1) ;
WaveformDA_sawtooth_1 = temp11;
WaveformDA_1 = AND_mask[(WaveformDA_triangle_1 & WaveformDA_sawtooth_1)] << 4;
break;
case 4:
if (temp11 >= PW_HiLo_voice_1 ) WaveformDA_pulse_1 = B4095; else WaveformDA_pulse_1 = 0;
WaveformDA_1 = WaveformDA_pulse_1;
break;
case 5:
WaveformDA_triangle_1 = (( (OSC_MSB_1 * B2047) ^ (temp11 & B2047)) << 1) ;
if (temp11 >= PW_HiLo_voice_1 ) WaveformDA_pulse_1 = B4095; else WaveformDA_pulse_1 = 0;
WaveformDA_1 = AND_mask[WaveformDA_triangle_1 & WaveformDA_pulse_1] << 4;
break;
case 6:
WaveformDA_sawtooth_1 = temp11; // same as upper 12 bits of OSC
if (temp11 >= PW_HiLo_voice_1 ) WaveformDA_pulse_1 = B4095; else WaveformDA_pulse_1 = 0;
WaveformDA_1 = AND_mask[WaveformDA_sawtooth_1 & WaveformDA_pulse_1] << 4;
break;
case 7:
WaveformDA_triangle_1 = (( (OSC_MSB_1 * B2047) ^ (temp11 & B2047)) << 1) ;
WaveformDA_sawtooth_1 = temp11;
if (temp11 >= PW_HiLo_voice_1 ) WaveformDA_pulse_1 = B4095; else WaveformDA_pulse_1 = 0;
WaveformDA_1 = AND_mask[WaveformDA_pulse_1 & WaveformDA_sawtooth_1 & WaveformDA_triangle_1] << 4;
break;
case 8:
WaveformDA_noise_1 = B4095 & (pseudorandom_1 >> 11);
WaveformDA_1 = WaveformDA_noise_1;
break;
case 9:
WaveformDA_1 = 0;
break;
case 10:
WaveformDA_1 = 0;
break;
case 11:
WaveformDA_1 = 0;
break;
case 12:
WaveformDA_1 = 0;
break;
case 13:
WaveformDA_1 = 0;
break;
case 14:
WaveformDA_1 = 0;
break;
case 15:
WaveformDA_1 = 0;
break;
}
// voice 2
temp12 = (OSC_2 >> 12);
switch (waveform_switch_2) {
case 0:
WaveformDA_2 = 0;
break;
case 1:
WaveformDA_triangle_2 = (( (OSC_MSB_2 * B2047) ^ (temp12 & B2047)) << 1) ;
WaveformDA_2 = WaveformDA_triangle_2;
break;
case 2:
WaveformDA_sawtooth_2 = temp12;
WaveformDA_2 = WaveformDA_sawtooth_2;
break;
case 3:
WaveformDA_triangle_2 = (( (OSC_MSB_2 * B2047) ^ (temp12 & B2047)) << 1) ;
WaveformDA_sawtooth_2 = temp12;
WaveformDA_2 = AND_mask[(WaveformDA_triangle_2 & WaveformDA_sawtooth_2)] << 4;
break;
case 4:
if (temp12 >= PW_HiLo_voice_2 ) WaveformDA_pulse_2 = B4095; else WaveformDA_pulse_2 = 0;
WaveformDA_2 = WaveformDA_pulse_2;
break;
case 5:
WaveformDA_triangle_2 = (( (OSC_MSB_2 * B2047) ^ (temp12 & B2047)) << 1) ;
if (temp12 >= PW_HiLo_voice_2 ) WaveformDA_pulse_2 = B4095; else WaveformDA_pulse_2 = 0;
WaveformDA_2 = AND_mask[WaveformDA_triangle_2 & WaveformDA_pulse_2] << 4;
break;
case 6:
WaveformDA_sawtooth_2 = temp12;
if (temp12 >= PW_HiLo_voice_2 ) WaveformDA_pulse_2 = B4095; else WaveformDA_pulse_2 = 0;
WaveformDA_2 = AND_mask[WaveformDA_sawtooth_2 & WaveformDA_pulse_2] << 4;
break;
case 7:
WaveformDA_triangle_2 = (( (OSC_MSB_2 * B2047) ^ (temp12 & B2047)) << 1) ;
WaveformDA_sawtooth_2 = temp12;
if (temp12 >= PW_HiLo_voice_2 ) WaveformDA_pulse_2 = B4095; else WaveformDA_pulse_2 = 0;
WaveformDA_2 = AND_mask[WaveformDA_pulse_2 & WaveformDA_sawtooth_2 & WaveformDA_triangle_2] << 4;
break;
case 8:
WaveformDA_noise_2 = B4095 & (pseudorandom_2 >> 11);
WaveformDA_2 = WaveformDA_noise_2;
break;
case 9:
WaveformDA_2 = 0;
break;
case 10:
WaveformDA_2 = 0;
break;
case 11:
WaveformDA_2 = 0;
break;
case 12:
WaveformDA_2 = 0;
break;
case 13:
WaveformDA_2 = 0;
break;
case 14:
WaveformDA_2 = 0;
break;
case 15:
WaveformDA_2 = 0;
break;
}
// voice 3
temp13 = (OSC_3 >> 12);
switch (waveform_switch_3) {
case 0:
WaveformDA_3 = 0;
break;
case 1:
WaveformDA_triangle_3 = (( (OSC_MSB_3 * B2047) ^ (temp13 & B2047)) << 1) ;
WaveformDA_3 = WaveformDA_triangle_3;
break;
case 2:
WaveformDA_sawtooth_3 = temp13;
WaveformDA_3 = WaveformDA_sawtooth_3;
break;
case 3:
WaveformDA_triangle_3 = (( (OSC_MSB_3 * B2047) ^ (temp13 & B2047)) << 1) ;
WaveformDA_sawtooth_3 = temp13;
WaveformDA_3 = AND_mask[(WaveformDA_triangle_3 & WaveformDA_sawtooth_3)] << 4;
break;
case 4:
if (temp13 >= PW_HiLo_voice_3 ) WaveformDA_pulse_3 = B4095; else WaveformDA_pulse_3 = 0;
WaveformDA_3 = WaveformDA_pulse_3;
break;
case 5:
WaveformDA_triangle_3 = (( (OSC_MSB_3 * B2047) ^ (temp13 & B2047)) << 1) ;
if (temp13 >= PW_HiLo_voice_3 ) WaveformDA_pulse_3 = B4095; else WaveformDA_pulse_3 = 0;
WaveformDA_3 = AND_mask[WaveformDA_triangle_3 & WaveformDA_pulse_3] << 4;
break;
case 6:
WaveformDA_sawtooth_3 = temp13;
if (temp13 >= PW_HiLo_voice_3 ) WaveformDA_pulse_3 = B4095; else WaveformDA_pulse_3 = 0;
WaveformDA_3 = AND_mask[WaveformDA_sawtooth_3 & WaveformDA_pulse_3] << 4;
break;
case 7:
WaveformDA_triangle_3 = (( (OSC_MSB_3 * B2047) ^ (temp13 & B2047)) << 1) ;
WaveformDA_sawtooth_3 = temp13;
if (temp13 >= PW_HiLo_voice_3 ) WaveformDA_pulse_3 = B4095; else WaveformDA_pulse_3 = 0;
WaveformDA_3 = AND_mask[WaveformDA_pulse_3 & WaveformDA_sawtooth_3 & WaveformDA_triangle_3] << 4;
break;
case 8:
WaveformDA_noise_3 = B4095 & (pseudorandom_3 >> 11);
WaveformDA_3 = WaveformDA_noise_3;
break;
case 9:
WaveformDA_3 = 0;
break;
case 10:
WaveformDA_3 = 0;
break;
case 11:
WaveformDA_3 = 0;
break;
case 12:
WaveformDA_3 = 0;
break;
case 13:
WaveformDA_3 = 0;
break;
case 14:
WaveformDA_3 = 0;
break;
case 15:
WaveformDA_3 = 0;
break;
}
//ADSR1
// gate change check
switch (Gate_bit_1) {
case 0:
if (Gate_previous_1 == 1) {
ADSR_stage_1 = 4;
LFSR15_1 = 0;
LFSR5_1 = 0;
LFSR15_comparator_value_1 = ADSR_LFSR15[ADSR_Release_1];
Gate_previous_1 = 0;
}
break;
case 1:
if (Gate_previous_1 == 0) {
ADSR_stage_1 = 1; //
LFSR15_1 = 0;
LFSR5_1 = 0;
Gate_previous_1 = 1;
hold_zero_1 = false;
LFSR15_comparator_value_1 = ADSR_LFSR15[ADSR_Attack_1];
}
break;
}
// Increase LFSR15 counter for ADSR (scaled to match)
LFSR15_1 = LFSR15_1 + multiplier;;
if ( ((LFSR15_1 >= LFSR15_comparator_value_1 ) ) ) {
Divided_LFSR15_1 = ((LFSR15_1 ) / LFSR15_comparator_value_1);
LFSR15_1 = LFSR15_1 - Divided_LFSR15_1 * LFSR15_comparator_value_1;
LFSR5_1 = LFSR5_1 + Divided_LFSR15_1 ;
if ((ADSR_stage_1 == 1) | (LFSR5_1 >= LFSR5_comparator_value_1) ) {
Divided_LFSR5_1 = (LFSR5_1 ) / LFSR5_comparator_value_1;
if (Divided_LFSR5_1 >= 1) {
LFSR5_1 = 0;
}
else {
LFSR5_1 = LFSR5_1 - Divided_LFSR5_1 * LFSR5_comparator_value_1;
}
if (hold_zero_1 == false) {
switch (ADSR_stage_1) {
case 0:
break;
case 1:
ADSR_volume_1 = (ADSR_volume_1 + Divided_LFSR15_1) ;
if (ADSR_volume_1 >= 0xff) {
ADSR_volume_1 = 0xff - (ADSR_volume_1 - 0xff);
ADSR_stage_1 = 2;
hold_zero_1 = false;
LFSR15_comparator_value_1 = ADSR_LFSR15[ADSR_Decay_1 ];
}
break;
case 2:
if (ADSR_volume_1 >= Divided_LFSR5_1) {
ADSR_volume_1 = ADSR_volume_1 - Divided_LFSR5_1;
}
else {
ADSR_volume_1 = 0;
}
if (ADSR_volume_1 <= uint16_t(( ADSR_Sustain_1 << 4) + ADSR_Sustain_1)) {
ADSR_volume_1 = (( ADSR_Sustain_1 << 4) + ADSR_Sustain_1);
LFSR15_comparator_value_1 = ADSR_LFSR15[ADSR_Release_1 ];
ADSR_stage_1 = 3;
}
break;
case 3:
if (ADSR_volume_1 > uint16_t(( ADSR_Sustain_1 << 4) + ADSR_Sustain_1)) {
ADSR_stage_1 = 2;
LFSR15_comparator_value_1 = ADSR_LFSR15[ADSR_Decay_1 ];
}
break;
case 4:
if (ADSR_volume_1 >= Divided_LFSR5_1) {
ADSR_volume_1 = ADSR_volume_1 - Divided_LFSR5_1;
}
else {
ADSR_volume_1 = 0;
}
break;
}
LFSR5_comparator_value_1 = ADSR_Volume2LFSR5[ADSR_volume_1];
if (ADSR_volume_1 == 0) {
hold_zero_1 = true;
}
}
}
}
//ADSR2
// gate change check
switch (Gate_bit_2) {
case 0:
if (Gate_previous_2 == 1) {
ADSR_stage_2 = 4;
LFSR15_2 = 0;
LFSR5_2 = 0;
LFSR15_comparator_value_2 = ADSR_LFSR15[ADSR_Release_2];
Gate_previous_2 = 0;
}
break;
case 1:
if (Gate_previous_2 == 0) {
ADSR_stage_2 = 1;
LFSR15_2 = 0;
LFSR5_2 = 0;
Gate_previous_2 = 1;
hold_zero_2 = false;
LFSR15_comparator_value_2 = ADSR_LFSR15[ADSR_Attack_2];
}
break;
}
// Increase LFSR15 counter for ADSR (scaled to match)
LFSR15_2 = LFSR15_2 + multiplier;;
if ( ((LFSR15_2 >= LFSR15_comparator_value_2 ) ) ) {
Divided_LFSR15_2 = ((LFSR15_2 ) / LFSR15_comparator_value_2);
LFSR15_2 = LFSR15_2 - Divided_LFSR15_2 * LFSR15_comparator_value_2;
LFSR5_2 = LFSR5_2 + Divided_LFSR15_2 ;
if ((ADSR_stage_2 == 1) | (LFSR5_2 >= LFSR5_comparator_value_2) ) {
Divided_LFSR5_2 = (LFSR5_2 ) / LFSR5_comparator_value_2;
if (Divided_LFSR5_2 >= 1) {
LFSR5_2 = 0;
}
if (hold_zero_2 == false) {
switch (ADSR_stage_2) {
case 0:
break;
case 1:
ADSR_volume_2 = (ADSR_volume_2 + Divided_LFSR15_2) ;
if (ADSR_volume_2 >= 0xff) {
ADSR_volume_2 = 0xff - (ADSR_volume_2 - 0xff);
ADSR_stage_2 = 2;
hold_zero_2 = false;
LFSR15_comparator_value_2 = ADSR_LFSR15[ADSR_Decay_2 ];
}
break;
case 2:
if (ADSR_volume_2 >= Divided_LFSR5_2) {
ADSR_volume_2 = ADSR_volume_2 - Divided_LFSR5_2;
}
else {
ADSR_volume_2 = 0;
}
if (ADSR_volume_2 <= uint16_t(( ADSR_Sustain_2 << 4) + ADSR_Sustain_2)) {
ADSR_volume_2 = (( ADSR_Sustain_2 << 4) + ADSR_Sustain_2);
LFSR15_comparator_value_2 = ADSR_LFSR15[ADSR_Release_2 ];
ADSR_stage_2 = 3;
}
break;
case 3:
if (ADSR_volume_2 > uint16_t(( ADSR_Sustain_2 << 4) + ADSR_Sustain_2)) {
ADSR_stage_2 = 2;
LFSR15_comparator_value_2 = ADSR_LFSR15[ADSR_Decay_2 ];
}
break;
case 4:
if (ADSR_volume_2 >= Divided_LFSR5_2) {
ADSR_volume_2 = ADSR_volume_2 - Divided_LFSR5_2;
}
else {
ADSR_volume_2 = 0;
}
break;
}
LFSR5_comparator_value_2 = ADSR_Volume2LFSR5[ADSR_volume_2];
if (ADSR_volume_2 == 0) {
hold_zero_2 = true;
}
}
}
}
//ADSR3
// gate change check
switch (Gate_bit_3) {
case 0:
if (Gate_previous_3 == 1) {
ADSR_stage_3 = 4;
LFSR15_3 = 0;
LFSR5_3 = 0;
LFSR15_comparator_value_3 = ADSR_LFSR15[ADSR_Release_3];
Gate_previous_3 = 0;
}
break;
case 1:
if (Gate_previous_3 == 0) {
ADSR_stage_3 = 1; //
LFSR15_3 = 0;
LFSR5_3 = 0;
Gate_previous_3 = 1;
hold_zero_3 = false;
LFSR15_comparator_value_3 = ADSR_LFSR15[ADSR_Attack_3];
}
break;
}
// Increase LFSR15 counter for ADSR (scaled to match)
LFSR15_3 = LFSR15_3 + multiplier;;
if ( ((LFSR15_3 >= LFSR15_comparator_value_3 ) ) ) {
Divided_LFSR15_3 = ((LFSR15_3 ) / LFSR15_comparator_value_3);
LFSR15_3 = LFSR15_3 - Divided_LFSR15_3 * LFSR15_comparator_value_3;
LFSR5_3 = LFSR5_3 + Divided_LFSR15_3 ;
if ((ADSR_stage_3 == 1) | (LFSR5_3 >= LFSR5_comparator_value_3) ) {
Divided_LFSR5_3 = (LFSR5_3 ) / LFSR5_comparator_value_3;
if (Divided_LFSR5_3 >= 1) {
LFSR5_3 = 0;
}
else {
LFSR5_3 = LFSR5_3 - Divided_LFSR5_3 * LFSR5_comparator_value_3;
}
if (hold_zero_3 == false) {
switch (ADSR_stage_3) {
case 0:
break;
case 1:
ADSR_volume_3 = (ADSR_volume_3 + Divided_LFSR15_3) ;
if (ADSR_volume_3 >= 0xff) {
ADSR_volume_3 = 0xff - (ADSR_volume_3 - 0xff);
ADSR_stage_3 = 2;
hold_zero_3 = false;
LFSR15_comparator_value_3 = ADSR_LFSR15[ADSR_Decay_3 ];
}
break;
case 2:
if (ADSR_volume_3 >= Divided_LFSR5_3) {
ADSR_volume_3 = ADSR_volume_3 - Divided_LFSR5_3;
}
else {
ADSR_volume_3 = 0;
}
if (ADSR_volume_3 <= uint16_t(( ADSR_Sustain_3 << 4) + ADSR_Sustain_3)) {
ADSR_volume_3 = (( ADSR_Sustain_3 << 4) + ADSR_Sustain_3);
LFSR15_comparator_value_3 = ADSR_LFSR15[ADSR_Release_3 ];
ADSR_stage_3 = 3;
}
break;
case 3:
if (ADSR_volume_3 > uint16_t(( ADSR_Sustain_3 << 4) + ADSR_Sustain_3)) {
ADSR_stage_3 = 2;
LFSR15_comparator_value_3 = ADSR_LFSR15[ADSR_Decay_3 ];
}
break;
case 4:
if (ADSR_volume_3 >= Divided_LFSR5_3) {
ADSR_volume_3 = ADSR_volume_3 - Divided_LFSR5_3;
}
else {
ADSR_volume_3 = 0;
}
break;
}
LFSR5_comparator_value_3 = ADSR_Volume2LFSR5[ADSR_volume_3];
if (ADSR_volume_3 == 0) {
hold_zero_3 = true;
}
}
}
}
// FILTERS:
#ifndef USE_FILTERS
if (FILTER_Enable_1) {
if (FILTER_LP) {
WaveformDA_1 = 0xfff - WaveformDA_1 ;
}
if (FILTER_HP) {
WaveformDA_1 = 0xfff - WaveformDA_1 ;
}
}
if (FILTER_Enable_2) {
if (FILTER_LP) {
WaveformDA_2 = 0xfff - WaveformDA_2 ;
}
if (FILTER_HP) {
WaveformDA_2 = 0xfff - WaveformDA_2 ;
}
}
if (FILTER_Enable_3) {
if (FILTER_LP) {
WaveformDA_3 = 0xfff - WaveformDA_3 ;
}
if (FILTER_HP) {
WaveformDA_3 = 0xfff - WaveformDA_3 ;
}
}
#endif
if (!USE_CHANNEL_1) {
WaveformDA_1 = 0;
}
if (!USE_CHANNEL_2) {
WaveformDA_2 = 0;
}
if (!USE_CHANNEL_3) {
WaveformDA_3 = 0;
}
/////////////////// ANALOG ///////////////////////////
Volume_1 = int32_t(WaveformDA_1 * ADSR_volume_1) - 0x80000 ;
Volume_2 = int32_t(WaveformDA_2 * ADSR_volume_2) - 0x80000 ;
Volume_3 = int32_t(WaveformDA_3 * ADSR_volume_3) - 0x80000 ;
// FILTERS redirect to filtered or unfiltered output
switch (FILTER_Enable_switch) {
default:
case 0x0:
Volume_filtered = 0;
if (OFF3 )
{
Volume_unfiltered = Volume_1 + Volume_2;
}
else {
Volume_unfiltered = Volume_1 + Volume_2 + Volume_3 ;
}
break;
case 0x1:
Volume_filtered = Volume_1;
if (OFF3 )
{
Volume_unfiltered = Volume_2;
}
else
{
Volume_unfiltered = Volume_2 + Volume_3 ;
}
break;
case 0x2:
Volume_filtered = Volume_2;
if (OFF3 )
{
Volume_unfiltered = Volume_1 ;
}
else
{
Volume_unfiltered = Volume_1 + Volume_3 ;
}
break;
case 0x3:
Volume_filtered = Volume_1 + Volume_2;
if (OFF3 )
{
Volume_unfiltered = 0 ;
}
else
{
Volume_unfiltered = Volume_3 ;
}
break;
case 0x4:
Volume_filtered = Volume_3;
Volume_unfiltered = Volume_1 + Volume_2 ;
break;
case 0x5:
Volume_filtered = Volume_1 + Volume_3;
Volume_unfiltered = Volume_2 ;
break;
case 0x6:
Volume_filtered = Volume_2 + Volume_3;
Volume_unfiltered = Volume_1 ;
break;
case 0x7:
Volume_filtered = Volume_1 + Volume_2 + Volume_3;
Volume_unfiltered = 0;
break;
}
Volume_filter_input = Volume_filtered;
Volume_filter_output = Volume_filtered;
#ifdef USE_FILTERS
Volume_filter_input = int32_t(Volume_filter_input) >> 7;
delta_t = multiplier;
delta_t_flt = FILTER_SENSITIVITY;
while (delta_t) {
if (delta_t < delta_t_flt) {
delta_t_flt = delta_t;
}
w0_delta_t = (int32_t(w0_ceil_dt * delta_t_flt) >> 6);
dVbp = (int32_t(w0_delta_t*Vhp) >> 14);
dVlp = (int32_t(w0_delta_t*Vbp) >> 14);
Vbp -= dVbp;
Vlp -= dVlp;
Vhp = (int32_t(Vbp * (Q_1024_div)) >> 10) - Vlp - Volume_filter_input;
delta_t -= delta_t_flt;
}
Volume_filter_output = 0;
if (FILTER_LP) {
Volume_filter_output = Volume_filter_output + Vlp;
}
if (FILTER_HP) {
Volume_filter_output = Volume_filter_output + Vhp;
}
if (FILTER_BP) {
Volume_filter_output = Volume_filter_output + Vbp;
}
//
Volume_filter_output = (int32_t(Volume_filter_output) << 7);
#endif
Volume = ((Volume_filter_output + Volume_unfiltered) >> 2 ) + 0x80000;
if (Volume < 0) Volume = 0;
if (Volume > 0xfffff) Volume = 0xfffff;
// main_volume_32bit = ( magic_number * period * ((Volume)&0xfffff) * MASTER_VOLUME) >> 24;
main_volume_32bit = (Volume ) ;
main_volume_32bit = (main_volume_32bit * magic_number);
main_volume_32bit = (main_volume_32bit) >> 12;
main_volume_32bit = (main_volume_32bit * MASTER_VOLUME);
main_volume_32bit = (main_volume_32bit * period) ;
main_volume_32bit = (main_volume_32bit ) >> 12;
main_volume = main_volume_32bit + 1;
OSC3 = (OSC_3 >> 16) & 0xff; //
/*
OSC3 = (((OSC_3 & 0x400000) >> 11) | // OSC3 output for SID register
((OSC_3 & 0x100000) >> 10) |
((OSC_3 & 0x010000) >> 7) |
((OSC_3 & 0x002000) >> 5) |
((OSC_3 & 0x000800) >> 4) |
((OSC_3 & 0x000080) >> 1) |
((OSC_3 & 0x000010) << 1) |
((OSC_3 & 0x000004) << 2) )&0xff;
*/
//
ENV3 = (ADSR_volume_3) & 0xff; ; // ((Volume_3 + 0x80000) >> 12) & 0xff;
//
SID[25] = POTX;
SID[26] = POTY;
SID[27] = OSC3;
SID[28] = ENV3;
}