8Bit Timer/Counter

 * Hello_AVR.cpp
 *
 * Created: 2017-01-07(YYYY-MM-DD) AM 5:08:05
 * Author : Michael Jun-Hyuk Im([email protected])
 */ 

#define F_CPU 16000000
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>

volatile char tick_flag = 0;

ISR(TIMER1_OVF_vect) //OVF1 20ms timer
{
     static unsigned int OVF1=0;
     TCNT1 = -5000; // 20msc 
     OVF1++;

    if(OVF1 == 1){
        tick_flag=1;
        OVF1=0;
    }
}

ISR(TIMER1_COMPA_vect) //CTC1A 20ms timer
{
    static unsigned char CTC1A=0;
    CTC1A++;

    if(CTC1A == 1){ 
        tick_flag=1;
        CTC1A=0;
    }
}

ISR(TIMER1_COMPB_vect) //CTC1B 20ms timer
{
    static unsigned char CTC1B=0;
    CTC1B++;

    if(CTC1B == 1){
        tick_flag=1;
        CTC1B=0;
    }
}

ISR(TIMER1_COMPC_vect) //CTC1C 20ms timer
{
    static unsigned char CTC1C=0;
    CTC1C++;

    if(CTC1C == 1){
        tick_flag=1;
        CTC1C=0;
    }
}

void MI_GPIO_config()
{   
    DDRG = 0x03; // 0,1 보드 LED, 2,3 보드 SW
}

void MI_TC1_OVF_Config()
{
    TCCR1A |= (0 << COM1A1)|(0 << COM1A0)| //COM_1A(00). No output
              (0 << COM1B1)|(0 << COM1B0)| //COM_1B(00). No output
              (0 << COM1C1)|(0 << COM1C0)| //COM_1C(00). No output
              (0 << WGM11)|(0 << WGM10); //WGM(00) Normal Mode

    TCCR1B |=  (0 << ICNC1)|(0 << ICES1)| //Input Capture Noise Canceler, Input Capture Edge Selector       
               (0 << WGM13)|(0 << WGM12)| //WGM(00) Normal Mode
               (0 << CS12)|(1 << CS11)|(1 << CS10); //CS(011).64분주비 (1/16000000)*64=0.000004=4us

    TCCR1C |= (0 << FOC1A)|(0 << FOC1B)|(0 << FOC1C); //Force Output Compare for Channel 1_A,B,C

    TCNT1 = -5000; // 20msc     

    TIMSK |= (1<<TOIE1); //Overflow Interrupt
    //ETIMSK //For Channel 3
}
void MI_TC1_CTC_Config()
{
    TCCR1A |= (0 << COM1A1)|(0 << COM1A0)| //COM_1A(00). No output
    (0 << COM1B1)|(0 << COM1B0)| //COM_1B(00). No output
    (0 << COM1C1)|(0 << COM1C0)| //COM_1C(00). No output
    (0 << WGM11)|(0 << WGM10);  

    TCCR1B |=  (0 << ICNC1)|(0 << ICES1)| //Input Capture Noise Canceler, Input Capture Edge Selector
    (0 << WGM13)|(1 << WGM12)| //WGM(0100) CTC Mode(TOP depend OCR1x), WGM(1100) CTC Mode(TOP depend ICR1)
    (0 << CS12)|(1 << CS11)|(1 << CS10); //CS(011).64분주비 (1/16000000)*64=0.000004=4us

    TCCR1C |= (0 << FOC1A)|(0 << FOC1B)|(0 << FOC1C); //Force Output Compare for Channel 1_A,B,C    

    ///WGM 0100
    OCR1A = 5000 - 1;
    OCR1B = 5000 - 1; 
    OCR1C = 5000 - 1;

    ///WGM 1100
    //ICR1 = 5000 - 1; 

    TIMSK |= (1<<OCIE1A)|(1<<OCIE1B); //Compare Match Interrupt Enable
    ETIMSK |= (1<<OCIE1C); 
}

void MI_TC1_PC_PWM_Config()
{
    DDRB |= (1 << PB5) | (1 << PB6) | (1 << PB7); //A,B,C
    TCCR1A |= (1 << COM1A1)|(0 << COM1A0)| //COM_1A(10). Clear OC1A on compare match when up-counting. Set OC1A on compare match when down-counting.
    (1 << COM1B1)|(0 << COM1B0)| //COM_1B(10). 
    (1 << COM1C1)|(0 << COM1C0)| //COM_1C(10). 
    (1 << WGM11)|(0 << WGM10);

    TCCR1B |=  (0 << ICNC1)|(0 << ICES1)| //Input Capture Noise Canceler, Input Capture Edge Selector
    (1 << WGM13)|(0 << WGM12)| //10 WGM(1010) PWM Mode(TOP depend ICR1)
    (0 << CS12)|(1 << CS11)|(1 << CS10); //CS(011).64분주비 (1/16000000)*64=0.000004=4us

    TCCR1C |= (0 << FOC1A)|(0 << FOC1B)|(0 << FOC1C); //Force Output Compare for Channel 1_A,B,C

    //dual slope operation.
    ICR1 = 5000 - 1; //20ms * 2 = 40ms, total cycle
    //ICR1 = 2500-1; //10ms * 2 = 20ms, total cycle

    OCR1A = 500; //2ms * 2 = 4ms, uptime
    OCR1B = 1000; //4 
    OCR1C = 1500; //6
}

void MI_TC1_PFC_PWM_Config()
{
    DDRB |= (1 << PB5) | (1 << PB6) | (1 << PB7); //A,B,C
    TCCR1A |= (1 << COM1A1)|(0 << COM1A0)| //COM_1A(10). Clear OC1A on compare match when up-counting. Set OC1A on compare match when down-counting.
    (1 << COM1B1)|(0 << COM1B0)| //COM_1B(10).
    (1 << COM1C1)|(0 << COM1C0)| //COM_1C(10).
    (0 << WGM11)|(0 << WGM10);

    TCCR1B |=  (0 << ICNC1)|(0 << ICES1)| //Input Capture Noise Canceler, Input Capture Edge Selector
    (1 << WGM13)|(0 << WGM12)| //10 WGM(1010) PWM Mode(TOP depend ICR1)
    (0 << CS12)|(1 << CS11)|(1 << CS10); //CS(011).64분주비 (1/16000000)*64=0.000004=4us

    TCCR1C |= (0 << FOC1A)|(0 << FOC1B)|(0 << FOC1C); //Force Output Compare for Channel 1_A,B,C

    //dual slope operation.
    ICR1 = 5000 - 1; //20ms * 2 = 40ms, total cycle
    //ICR1 = 2500-1; //10ms * 2 = 20ms, total cycle

    OCR1A = 500; //2ms * 2 = 4ms, uptime
    OCR1B = 1000; //4
    OCR1C = 1500; //6
}

void MI_TC1_FAST_PWM_Config()
{
    DDRB |= (1 << PB5) | (1 << PB6) | (1 << PB7); //A,B,C
    TCCR1A |= (1 << COM1A1)|(0 << COM1A0)| //COM_1A(10). Clear OC1A on compare match when up-counting. Set OC1A on compare match when down-counting.
    (1 << COM1B1)|(0 << COM1B0)| //COM_1B(10).
    (1 << COM1C1)|(0 << COM1C0)| //COM_1C(10).
    (1 << WGM11)|(0 << WGM10);

    TCCR1B |=  (0 << ICNC1)|(0 << ICES1)| //Input Capture Noise Canceler, Input Capture Edge Selector
    (1 << WGM13)|(1 << WGM12)| //10 WGM(1010) PWM Mode(TOP depend ICR1)
    (0 << CS12)|(1 << CS11)|(1 << CS10); //CS(011).64분주비 (1/16000000)*64=0.000004=4us

    TCCR1C |= (0 << FOC1A)|(0 << FOC1B)|(0 << FOC1C); //Force Output Compare for Channel 1_A,B,C

    //dual slope operation.
    ICR1 = 5000 - 1; //20ms, total cycle
    //ICR1 = 2500-1; //10ms, total cycle

    OCR1A = 500; //2ms, uptime
    OCR1B = 1000; //4
    OCR1C = 1500; //6
}


int main(void)
{
  MI_GPIO_config();

   //Select below One of Modes
  MI_TC1_OVF_Config();         
  MI_TC1_CTC_Config();
  MI_TC1_PC_PWM_Config();
  MI_TC1_PFC_PWM_Config();     
  MI_TC1_FAST_PWM_Config();  

    sei();
        while (1)
        {        
            if(tick_flag == 1)
            {
                PORTA=PORTA^0xff;
                tick_flag=0;
            }
    }   
}