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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 "avrutil.h"
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#include "e2p.h"
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#include "wire.h"
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#include "mio.h"
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#include "lcd.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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#define UART_SEND_DELAY 5000
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#define BUTTON_DELAY 500
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#define LCD_SEND_DELAY 80
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volatile uint16_t buttontime = BUTTON_DELAY;
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volatile uint16_t sendtime = UART_SEND_DELAY;
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volatile uint8_t lcdTimer = LCD_SEND_DELAY;
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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          = 0B00001111;
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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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    sysclockInit();
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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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    i2c_master();
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    e2p_init();
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    mio_init();
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    lcd_init();
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    lcd_setCursor(0, 1);
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    lcd_print("Time:\0");
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    char display[10];
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    uint16_t address = 0x0003;
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    sbi(PORTD, PD6);
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    _delay_us(100);
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    cbi(PORTD, PD6);
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    mio_iodir(0x02);
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    mio_pullups(0x02);
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    //mio_writeReg(0x00, 0x02);
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    //mio_writeReg(0x06, 0x02);
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    //mio_writeReg(0x0a, 0x01);
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    //mio_writeReg(0x0a, 0x00);
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    for(;;){
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        wdt_reset();
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	cbi(PIND, PD6);
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	if (!rbi(PIND, PD7) && !buttontime) {
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	  sbi(PORTD, PD6);
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	  delay_ms(1);
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	  cbi(PORTD, PD6);
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	  uint8_t lsb = systime & 0x000000ff;
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	  e2p_writeByte(address, lsb);
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	  e2p_flush();
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	  uint8_t rdata = e2p_readByte(address);
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	  uart_puts("Write: ");
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	  utoa(lsb, display, 16);
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	  uart_puts(display);
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	  uart_puts("\r\n");
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	  lcd_overprint_right(display, 2, 3, 0);
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	  uart_puts("Read: ");
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	  utoa(rdata, display, 16);
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	  uart_puts(display);
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	  uart_puts("\r\n");
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	  lcd_overprint_right(display, 2, 6, 0);
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	  buttontime = BUTTON_DELAY;
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	}
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	if (!sendtime) {
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	  ltoa(systime, display, 10);
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	  uart_puts(display);
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	  uart_puts("\r\n");
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	  sendtime=UART_SEND_DELAY;
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	}
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	if (!lcdTimer) {
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	  ultoa(systime, display, 10);
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	  lcd_overprint_right(display, 10, 6, 1);
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	  uint8_t but1 = mio_readPin(1);
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	  if (but1) {
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	    cbi(PORTD, PD6);
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	    mio_latchPin(0, 0x00);
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	  } else {
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	    sbi(PORTD, PD6);
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	    mio_latchPin(0, 0x01);
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	  }
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	  utoa(but1, display, 16);
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	  lcd_overprint_right(display, 2, 0, 0);
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	  lcdTimer = LCD_SEND_DELAY;
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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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		if (lcdTimer)
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		    lcdTimer--;
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		if (buttontime)
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		    buttontime--;
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        }
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}