PWM Test

#define F_CPU 1000000 // The chip runs at 1 MHz as default (even if you are using a 8MHz crystal), this line is necessary for delay function

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

//Timer 0 initialisation
void init_timer0 ()
{
    //Set registry bits for timer
    TCCR0B      = 0b00000001;   //Set up timer 0 with no prescaler
    TCNT0       = 0b00000000;   //Initialise counter
}

int main()
{
    //Variables
    char ch_R_on_dur    = 1;    //Number of counts channel R should remain on for
    char ch_R_off_dur   = 254;  //Number of counts channel R should remain off for
    char ch_R_count     = 0;    //Counter tracking amount of time channel R has remained on/off

    char ch_G_on_dur    = 0;    //Number of counts channel G should remain on for
    char ch_G_off_dur   = 0;    //Number of counts channel G should remain off for
    char ch_G_count     = 0;    //Counter tracking amount of time channel G has remained on/off

    char ch_B_on_dur    = 0;    //Number of counts channel B should remain on for
    char ch_B_off_dur   = 0;    //Number of counts channel B should remain off for
    char ch_B_count     = 0;    //Counter tracking amount of time channel B has remained on/off

    char ch_W_on_dur    = 0;    //Number of counts channel W should remain on for
    char ch_W_off_dur   = 0;    //Number of counts channel W should remain off for
    char ch_W_count     = 0;    //Counter tracking amount of time channel W has remained on/off

    //Initialise Timer
    init_timer0();

    //Initialise LED output
    DDRC    = 0b10000000;   //Sets the direction of the PC7 to output
    PORTC   |= (1<<PC7);    //Sets PC7 high

    //Keep LED on at 100% for 2 seconds to show difference in output when PWM starts
    _delay_ms(2000);

    while(1)
    {
        //Update counters
        //If timer has ticked, update counters
        if (TCNT0 >= 1)
        {
            //Increment counters
            ch_R_count++;
            //Increment Green counter
            //Increment Blue counter
            //Increment White counter

            //Reset timer
            TCNT0 = 0;
        }

        //Cycle red led on and off at high speed
        //If channel R has been off for max duration
        if (PORTC == 0b00000000 && ch_R_count >= ch_R_off_dur)
        {
            //Turn channel R on
            PORTC |= (1<<PC7);

            //Reset channel R overflow counter
            ch_R_count = 0;
        } else {
        //If channel R has been on for max duration
        if (PORTC == 0b10000000 && ch_R_count >= ch_R_on_dur)
        {
            //Turn channel R off
            PORTC &= ~(1<<PC7);

            //Reset channel R overflow counter
            ch_R_count = 0;
        }}

        //Cycle Green LED

        //Cycle Blue LED

        //Cycle White LED
    }

    //End program
    return 0;
}