static void teensyAudioOutput()
{
#if (USE_AUDIO_INPUT==true)
adc_count = 0;
startSecondAudioADC();
#endif
analogWrite(AUDIO_CHANNEL_1_PIN, (int)output_buffer.read());
}
static void pwmAudioOutput()
{
#if (USE_AUDIO_INPUT==true)
adc_count = 0;
startSecondAudioADC();
#endif
#if (AUDIO_MODE == HIFI)
int out = output_buffer.read();
pwmWrite(AUDIO_CHANNEL_1_PIN, out & ((1 << AUDIO_BITS_PER_CHANNEL) - 1));
pwmWrite(AUDIO_CHANNEL_1_PIN_HIGH, out >> AUDIO_BITS_PER_CHANNEL);
#else
pwmWrite(AUDIO_CHANNEL_1_PIN, (int)output_buffer.read());
#endif
}
void dummy_function(void)
#endif
{
#if (USE_AUDIO_INPUT==true)
adc_count = 0;
startSecondAudioADC();
#endif
// read about dual pwm at http://www.openmusiclabs.com/learning/digital/pwm-dac/dual-pwm-circuits/
// sketches at http://wiki.openmusiclabs.com/wiki/PWMDAC, http://wiki.openmusiclabs.com/wiki/MiniArDSP
//if (!output_buffer.isEmpty()){
unsigned int out = output_buffer.read();
// 14 bit, 7 bits on each pin
AUDIO_CHANNEL_1_HIGHUINT8_T_REGISTER = out >> 7; // B11111110000000 becomes B1111111
AUDIO_CHANNEL_1_lowByte_REGISTER = out & 127; // B01111111
//}
}
ISR(TIMER1_OVF_vect, ISR_BLOCK)
{
#if (AUDIO_MODE == STANDARD_PLUS) && (AUDIO_RATE == 16384) // only update every second ISR, if lower audio rate
static boolean alternate;
alternate = !alternate;
if(alternate)
{
#endif
#if (USE_AUDIO_INPUT==true)
adc_count = 0;
startSecondAudioADC();
#endif
//if (!output_buffer.isEmpty()) {
/*
output = output_buffer.read();
AUDIO_CHANNEL_1_OUTPUT_REGISTER = output;
AUDIO_CHANNEL_2_OUTPUT_REGISTER = 0;
*/
AUDIO_CHANNEL_1_OUTPUT_REGISTER = output_buffer.read();
#if (STEREO_HACK == true)
AUDIO_CHANNEL_2_OUTPUT_REGISTER = output_buffer2.read();
#endif
//}
// flip signal polarity - instead of signal going to 0 (both pins 0), it goes to pseudo-negative of its current value.
// this would set non-inverted when setting sample value, and then inverted when top is reached (in an interrupt)
// non-invert
//TCCR1A |= _BV(COM1A1);
// invert
//TCCR1A |= ~_BV(COM1A1)
#if (AUDIO_MODE == STANDARD_PLUS) && (AUDIO_RATE==16384) // all this conditional compilation is so clutsy!
}
#endif
}
void dummy_function(void)
#endif
{
#if (USE_AUDIO_INPUT==true)
adc_count = 0;
startSecondAudioADC();
#endif
// read about dual pwm at http://www.openmusiclabs.com/learning/digital/pwm-dac/dual-pwm-circuits/
// sketches at http://wiki.openmusiclabs.com/wiki/PWMDAC, http://wiki.openmusiclabs.com/wiki/MiniArDSP
//if (!output_buffer.isEmpty()){
unsigned int out = output_buffer.read();
// 14 bit, 7 bits on each pin
//AUDIO_CHANNEL_1_highByte_REGISTER = out >> 7; // B00111111 10000000 becomes B1111111
// try to avoid looping over 7 shifts - need to check timing or disassemble to see what really happens
unsigned int out_high = out<<1; // B00111111 10000000 becomes B01111111 00000000
AUDIO_CHANNEL_1_highByte_REGISTER = out_high >> 8; // B01111111 00000000 produces B01111111
//
AUDIO_CHANNEL_1_lowByte_REGISTER = out & 127;
//}
}
ISR(TIMER1_OVF_vect, ISR_BLOCK)
{
#if (AUDIO_MODE == STANDARD_PLUS) && (AUDIO_RATE == 16384) // only update every second ISR, if lower audio rate
static boolean alternate;
alternate = !alternate;
if(alternate)
{
#endif
#if (USE_AUDIO_INPUT==true)
adc_count = 0;
startSecondAudioADC();
#endif
//if (!output_buffer.isEmpty()) {
AUDIO_CHANNEL_1_OUTPUT_REGISTER = output_buffer.read();
//}
#if (AUDIO_MODE == STANDARD_PLUS) && (AUDIO_RATE==16384) // all this conditional compilation is so clutsy!
}
#endif
}
