用AtmelStudio6.2跑mega16例程(68)IIC驱动MAX6953

/*

 * GccApplication31.c

 *

 * Created: 2014-12-9 22:46:45

 *  Author: Administrator

 */ 



#define F_CPU 4000000UL



#include <avr/io.h>

#include <avr/interrupt.h>

#include <util/twi.h>

#include <util/delay.h>

#include <string.h>

#include <stdint.h>



#define MAX6953R 0B10100001  //READ

#define MAX6953W 0B10100000  //WRITE



#define  Wait()  while((TWCR & _BV(TWINT))==0)

#define START() {TWCR = _BV(TWINT)|_BV(TWSTA)|_BV(TWEN);Wait();}

#define STOP() (TWCR = _BV(TWINT) | _BV(TWSTO)|_BV(TWEN))

#define WriteByte(x) {TWDR = (x);TWCR = _BV(TWINT)|_BV(TWEN);Wait();}

#define ACK() (TWCR |= _BV(TWEA))

#define NACK() (TWCR &=~_BV(TWEA))



char LED_String[] = "LEDSHOW: ddllxxrr ========0123456";



uint8_t MAX6953_Write(uint8_t addr,uint8_t dat)

{

    START();

        if(TW_STATUS != TW_START) return 0;

        WriteByte(MAX6953W);

        if(TW_STATUS != TW_MT_SLA_ACK) return 0;

        WriteByte(addr);

        if(TW_STATUS != TW_MT_DATA_ACK) return 0;

        WriteByte(dat);

        if(TW_STATUS != TW_MT_DATA_ACK)return 0;

        STOP();

        _delay_ms(2);

        return 1;

        

}

                

void MAX6953_INIT()

{

        MAX6953_Write(0x01,0xFF);

        MAX6953_Write(0x02,0xFF);

        MAX6953_Write(0x03,0x03);

        MAX6953_Write(0x04,0x01);

        MAX6953_Write(0x07,0x00);

        

}



int main(void)

{

    uint8_t i,j;

        DDRD = 0x00;PORTD = 0xFF;

        MCUCR = 0x02;

        GICR = 0x40;

        SREG = 0x80;

        MAX6953_INIT();

        

        while(1)

    {

        //TODO:: Please write your application code 

                for(i=0;i<=strlen(LED_String) - 4;i++)

                {

                        for(j=0;j<4;j++)

                        MAX6953_Write(0x20 | j,(uint8_t)LED_String[i+j]);

                        _delay_ms(300);

        }

                _delay_ms(2000);

        }

}



ISR(INT0_vect)

{

        static uint8_t Shut_Down_6955 = 0x01;

        Shut_Down_6955 ^=0x01;

        MAX6953_Write(0x04,0x00 | Shut_Down_6955);

}