// Public functions called from main.c
void initDigital() {
DIGITAL_PULLUP_ON(IN0);
DIGITAL_SET_HIGH(IN1);
DIGITAL_SET_LOW(IN2);
DIGITAL_SET_LOW(IN3);
// TODO(tobinsarah): allow configuration as input/output for each relevant pin
DIGITAL_SET_IN(IN0);
DIGITAL_SET_OUT(IN1);
DIGITAL_SET_OUT(IN2);
DIGITAL_SET_OUT(IN3);
}
// Public functions called from main.c
void initBuzzer() {
// Does everything to set up the analog stuffs.
// Turn on pin PC1 (which maps to IN0)
ADMUX |= (1 << MUX3) | (1 << MUX1);
#if F_CPU != 8000000
#error Clock speed not correct
#endif
// Enable the ADC and set the division factor between
// the system clock frequency and the input clock to the ADC.
// Division factor: 111 = 128
ADCSRA |= (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0) | (1 << ADEN);
// Set PA6 pin as output in order to see PWM signal
// Set pulse width to 1/2 of entire duration.
OCR1BL = 0x7F;
DIGITAL_SET_OUT(PWM0);
// DIGITAL_SET is also ANALOG_SET apparently...
DIGITAL_SET_IN(IN1);
DIGITAL_SET_IN(IN2);
DIGITAL_SET_IN(IN3);
// Testing
DIGITAL_SET_OUT(PWM1);
DIGITAL_SET_HIGH(PWM1);
// End Testing
// Set PWM to Fast PWM Mode Operation, with non-inverting PWM
// Clear OC1B on Compare Match
// Clock prescaler = 1/64
TCCR1A = (1 << COM1B1) | (1 << WGM10);
TCCR1B = (1 << WGM12) | (1 << CS11) | (1 << CS10);
// Enable Timer/Counter1 Overflow Interrupt
TIMSK = (1 << TOIE1);
sei();
}
