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#include "pwm.h"
//OutputCompareRegister for Timer1 and pin OC1A/B5
#define PWMB5_VAL OCR1AL
//for FastPWM in Timer4 OCR4C is TOP for all OC4x pins, all other PWM Modes use OCR4A,OCR4B or OCR4D
#define PWMD7_VAL OCR4D
void pwm_init(void)
{
//for OC1A on pin B5
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. (for FastPWM)
//for OC4D on pin D7
DDRD |= (1<<PD7);
TCCR4A = 0;
TCCR4B = 0;
TCCR4C = _BV(PWM4D); //Fast PWM: PWM4x == 0x1 && WGM41..40 ==0x00
TCCR4D = 0; //Fast PWM: PWM4x == 0x1 && WGM41..40 ==0x00
TCNT4 = 0;
OCR4C = 0xFF; //TOP value
OCR4D = 0;
}
inline void pwm_b5_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_d7_on(void)
{
TCCR4B = (TCCR4B & 0xF0) | (1<<CS40); // enable timer clock, no prescaling
TCCR4C |= (1<<COM4D1); // Clear OC4D on compare match when up-counting. Set when when TCNT4 == 0x000 (for FastPWM)
}
inline void pwm_b5_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)
}
inline void pwm_d7_off(void)
{
TCCR4B = (TCCR4B & 0xF0); //no clock source, timer stopped
TCCR4C &= ~(_BV(COM4D1) | _BV(COM4D0)); //normal port operation
TCNT4 = 0;
PORTD &= ~(1 << PD7); //set pin to LOW (otherwise it will remain in state since last pwm toggle)
}
void pwm_b5_set(uint8_t val)
{
if (val > 0)
pwm_b5_on();
else
pwm_b5_off();
PWMB5_VAL = val;
}
void pwm_d7_set(uint8_t val)
{
if (val > 0)
pwm_d7_on();
else
pwm_d7_off();
PWMD7_VAL = val;
}
inline void pwm_b5_inc(void)
{
if(PWMB5_VAL < 255)
PWMB5_VAL++;
}
inline void pwm_b5_dec(void)
{
if(PWMB5_VAL > 0)
PWMB5_VAL--;
}
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