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#include "pwm.h"
#define PWM_VAL OCR1AL
//OC1A
void pwm_init(void)
{
DDRB |= (1<<PB5);
TCCR1A = 0;
TCNT1 = 0;
OCR1A = 0;
TCCR1A = (1<<WGM10); //Fast PWM, 8-bit
TCCR1B = (1<<WGM12); //Fast PWM, 8-bit
//TCCR1A |= (1<<COM1A1) // Clear OCnA/OCnB/OCnC on compare match when up-counting. Set OCnA/OCnB/OCnC on compare match when downcounting.
}
inline void pwm_on(void)
{
TCCR1A |= (1<<COM1A1); // Clear OCnA/OCnB/OCnC on compare match when up-counting. Set OCnA/OCnB/OCnC on compare match when downcounting.
TCCR1B = (TCCR1B & 0xF8) | (1<<CS10); // enable timer clock, no prescaling
}
inline void pwm_off(void)
{
TCCR1A &= ~((1<<COM1A1) | (1<<COM1A0)); //normal port operation
TCCR1B = (TCCR1B & 0xF8); //no clock source, timer stopped
TCNT1 = 0;
PORTB &= ~ (1 << PB5); //set pin to LOW (otherwise it will remain in state since last pwm toggle)
}
void pwm_set(uint8_t val)
{
if (val > 0)
pwm_on();
else
pwm_off();
PWM_VAL = val;
}
inline void pwm_inc(void)
{
if(PWM_VAL < 255)
PWM_VAL++;
}
inline void pwm_dec(void)
{
if(PWM_VAL > 0)
PWM_VAL--;
}
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