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122 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 <avr/pgmspace.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 "uart.h"
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#ifndef NULL
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#define NULL    ((void *)0)
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#endif
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/* ------------------------------------------------------------------------- */
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#define UART_BAUD_RATE	9600
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volatile uint8_t tmr0_ovf = 0;
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volatile uint32_t systime = 0;
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volatile uint16_t sendtime = 1000;
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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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  */
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  /*
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        PB0     -
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        PB1     -
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        PB2     -
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        PB3     -
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        PB4     -
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        PB5     -
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        PB6     -
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        PB7     -
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  */
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  DDRB          = 0B11111111;
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  PORTB         = 0B00000000;
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  /*
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        PC0     -
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        PC1     -
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        PC2     -
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        PC3     -
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        PC4     -
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        PC5     -
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  */
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  DDRC          = 0B11111111;
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  PORTC         = 0B00000000;
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  /*
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        PD0     -
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        PD1     -
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        PD2     -
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        PD3     -
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        PD4     -
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        PD5     - Input PcInt		- * I/O Interrupt PCINT21
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        PD6     - Output		- * Status LED
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        PD7     - Input, Pullup		- * Button
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  */
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  DDRD          = 0B01011111;
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  PORTD         = 0B10000000;
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    TIMSK0 = (1<<TOIE0);                    // Enable timer overflow
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    TCNT0 = 0x00;                           // Set Timer0 initial value to 0
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    TCCR0B = (1<< CS00) ;                   // /1 prescaler
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  uart_init( UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU) );
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    wdt_enable(WDTO_1S);		// Watchdog for 1 sec
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    sei();				// Enable interrupts
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    sbi(PIND, PD6);
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    _delay_ms(500);
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    cbi(PIND, PD6);
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  char buffer[7];
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    for(;;){
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        wdt_reset();
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	if (rbi(PIND, PD7))
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	   cbi(PORTD, PD6);
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	else
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	   sbi(PORTD, PD6);
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	if (!sendtime) {
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	  ltoa(systime, buffer, 10);
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	  uart_puts(buffer);
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	  uart_puts("\r\n");
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	  sendtime=1000;
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	  xbi(PORTD, PD6);
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	}
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	_delay_ms(1);
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    }
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    return 0;
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}
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ISR(TIMER0_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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        if (tmr0_ovf>=64) {
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                systime++;
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                tmr0_ovf = 0;
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		if (sendtime)
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		  sendtime--;
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        }
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}