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130 pfowler 1 
#include <avr/io.h>
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#include <avr/wdt.h>
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#include <avr/interrupt.h>
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#include <string.h>
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#include <util/delay.h>
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#include <stdlib.h>
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#include "config.h"
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#include "avrutil.h"
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#include "hc595.h"
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#include "twires.h"
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#ifndef NULL
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#define NULL    ((void *)0)
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#endif
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void writeSegment(uint8_t digit, uint8_t value);
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void pcInterrupt(void);
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void receiveEvent(uint8_t bytes);
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/* ------------------------------------------------------------------------- */
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volatile uint8_t user_debug = 0;
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volatile uint8_t tmr0_ovf = 0;
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int main(void) {
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  /*
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  DDR : 1 = Output, 0 = Input
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  PORT: 1 = Pullup for Input, otherwise set output
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  PIN : Read input pin
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	PB0     -
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	PB1     - 		- USB D- Low Speed
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	PB2     -		- USB D+
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	PB3     - 		- SDA i2c bb
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	PB4	-		- SCL i2c bb
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	PB5	-
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  */
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  DDRB          = 0B00000000;
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  PORTB         = 0B00000000;
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    systime = 0;
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    sysclockInit();
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    wdt_enable(WDTO_1S);	// Watchdog for 1 sec
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    sei();			// Enable interrupts
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    for(;;){
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    	 wdt_reset();
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    	if (user_debug) {
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    	}
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    }
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    return 0;
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}
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ISR(TIM0_OVF_vect) {
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	tmr0_ovf++;
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	// Clk/1 TCCR0B = (1<< CS00);
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	//20.0Mhz, 1ms = 78ovf
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	//16.5Mhz, 1ms = 64ovf
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	//16.0Mhz, 1ms = 62ovf
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	//12.0Mhz, 1ms = 46ovf
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	// 8.0Mhz, 1ms = 31ovf
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	// 8.0Mhz, .5ms = 15ovf, 160r
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	if (tmr0_ovf>=64) {
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			systime++;
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			tmr0_ovf = 0;
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	}
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}