/********************************************************************************
                                Includes
********************************************************************************/
#include <avr/io.h>
#include <stdbool.h>
#include <util/delay.h>

/********************************************************************************
                                Function Prototypes
********************************************************************************/
void delay_1ms(uint16_t ms);

/********************************************************************************
                                Main
********************************************************************************/
int main( void )
{
	uint8_t value = 0;
	uint16_t mydelay;
	mydelay=50;

     // configure PORTA as output
    DDRA = 0xFF;
    // setup PORTB data direction as an input
    DDRB = 0;
    // make sure it is high impedance and will not source

    PORTB = 0;
	// main loop
	while(true) {
		PORTA = ~value++;
		delay_1ms(mydelay);
	
	
		if(bit_is_clear(PINB,PB0)) {
			if(mydelay > 50) mydelay-=25;
			
			// wait for user to let go of switch, software debounce
			while(bit_is_clear(PINB,PB0)) _delay_ms(1);
		}

		if(bit_is_clear(PINB,PB1)) {
			if(mydelay < 5000) mydelay+=25;
			
			// wait for user to let go of switch, software debounce
			while(bit_is_clear(PINB,PB1)) _delay_ms(1);
		}
	}
}

// this wrapper function calls _delay_ms with a known value of 1
// if you call _delay_ms(variable) then the floating point library
// is going to be included and your output file gets much larger
void delay_1ms(uint16_t ms) {
	uint16_t i;
	for(i=0;i<ms;i++) _delay_ms(1);
}