//ICC-AVR applICation

// Target : M8515

// Crystal: 4.0000MHz

#include

#include

void port_init(void)

{

PORTA = 0x00;

DDRA = 0x03;

PORTB = 0x00;

DDRB = 0x70;

PORTC = 0x00;

DDRC = 0x70;

PORTD = 0xff;

DDRD = 0x00;

PORTE = 0x00;

DDRE = 0x00;

}

//call this routine to initialize all peripherals

void init_devices(void)

{

//stop errant interrupts until set up

CLI(); //dISAble all interrupts

port_init();

MCUCR = 0x00;

EMCUCR = 0x00;

GICR = 0x40;

TIMSK = 0x00;

SEI(); //re-enable interrupts

//all peripherals are now initialized

}

#define uchar unsigned char

#define uint unsigned int

#define LED_str_off PORTC&=~(1<#define led_clk_off PORTC&=~(1<#define led_d_off PORTC&=~(1<#define led_str_on PORTC|=(1<#define led_clk_on PORTC|=(1<#define led_d_on PORTC|=(1<

#define OP_READ 0xa1 // 器件地址以及讀取操作

#define OP_WRITE 0xa0 // 器件地址以及寫入操作

#define MAX_ADDR 0x7f // AT24C02最大地址

unsigned char dis_code[] = {0x81,0xB7,0xC2,0x92,0xB4,0x98,0x88,0xB3,0x80,0x90};

unsigned char a[]={90,11,12,13,14,15,22,7,8,9};

uchar led_buffer[4]={0,3};

#define SDA PA1

#define SCL PA0

#define SDA_on PORTA|=(1<#define SDA_off PORTA&=~(1<#define SCL_on PORTA|=(1<#define SCL_off PORTA&=~(1<

//void start();

//void stop();

//unsigned char shin();

//unsigned char shout(unsigned char write_data);

unsigned char read_random(unsigned char random_addr);

void write_byte( unsigned char addr, unsigned char write_data);

void fill_byte(unsigned char fill_data);

void delayms(unsigned char ms);

void update_display_dp(void);

void jisuan(uchar b_data );

unsigned char ndatatodisplay,gewei,shiwei;

main(void)

{

uchar i;

port_init();

SDA_on;

SCL_on;

fill_byte(0xff); // 全部填充0xff

for(i = 0 ; i < 10; i++) //寫入顯示代碼到AT24Cxx

{

write_byte(i, a);

}

init_devices();

while(1);

}

#pragma interrupt_handler int0_isr:2

void int0_isr(void)

{

uchar i;

jisuan((read_random(i)));

ndatatodisplay =( shiwei*10+gewei); // 循環(huán)讀取24Cxx內容，并輸出到P0口

i++;

if(i>9)i=0; // 循環(huán)讀取范圍為0x00～0x07

delayms(250);

update_display_dp();

}

void _nop_()

{

}

void update_display_dp(void)

{

uchar bit_count=0;

uchar byte_counter=0;

uchar i=0;

led_buffer[3]=ndatatodisplay/1000;

led_buffer[2]=(ndatatodisplay%1000)/100;

led_buffer[1]=(ndatatodisplay%100)/10;

led_buffer[0]=ndatatodisplay%10;

led_str_off;

led_clk_off;

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

{

bit_count=8;

i=dis_code[led_buffer][byte_counter]];

while(bit_count>0)

{

if((i&0x01)==0)

{

led_d_off;

}

else

{

led_d_on;

}

i=(i>>1);

led_clk_on;

led_clk_off;

bit_count--;

}

}

led_str_on;

}

void jisuan(uchar b_data )

{

uchar e,d;

e=b_data;

d=e;

e=e&0x0f;

d=d>>4;

gewei=(e&0x01)+((e>>1)&0x01)*2+((e>>2)&0x01)*4+((e>>3)&0x01)*8;

shiwei=(d&0x01)+((d>>1)&0x01)*2+((d>>2)&0x01)*4+((d>>3)&0x01)*8;

}

void start()

// 開始位

{

SDA_on;

SCL_on;

_nop_();

_nop_();

SDA_off;

_nop_();

_nop_();

_nop_();

_nop_();

SCL_off;

}

void stop()

// 停止位

{

SDA_off;

_nop_();

_nop_();

SCL_on;

_nop_();

_nop_();

_nop_();

_nop_();

SDA_on;

}

unsigned char shin()

// 從AT24Cxx移入數(shù)據(jù)到MCU

{

unsigned char i,read_data;

for(i = 0; i < 8; i++)

{

SCL_on;

DDRA&=0xfd;

read_data <<= 1;

read_data |= (PINA&0X02);

SCL_off;

DDRA&=0xfd;

}

return(read_data);

}

uchar shout(unsigned char write_data)

// 從MCU移出數(shù)據(jù)到AT24Cxx

{

unsigned char i;

uchar ack_bit;

for(i = 0; i < 8; i++) // 循環(huán)移入8個位

{

if(write_data & 0x80)

{

SDA_on;

DDRA=0XFF;

_nop_();

}

else

{

SDA_off;[!--empirenews.page--]

DDRA=0XFF;

_nop_();

}

SCL_on;

DDRA=0XFF;

_nop_();

_nop_();

SCL_off;

DDRA=0XFF;

write_data <<= 1;

}

SDA_on;

DDRA=0XFF; // 讀取應答

_nop_();

_nop_();

SCL_on;

DDRA=0XFF;

_nop_();

_nop_();

_nop_();

_nop_();

ack_bit = PINA&0X02;

SCL_off;

DDRA=0XFF;

return ack_bit; // 返回AT24Cxx應答位

}

void write_byte(unsigned char addr, unsigned char write_data)

// 在指定地址addr處寫入數(shù)據(jù)write_data

{

start();

shout(OP_WRITE);

shout(addr);

shout(write_data);

stop();

delayms(10); // 寫入周期

}

void fill_byte(unsigned char fill_data)

// 填充數(shù)據(jù)fill_data到EEPROM內

{

unsigned char i;

for(i = 0; i < MAX_ADDR; i++)

{

write_byte(i, fill_data);

}

}

unsigned char read_current()

// 在當前地址讀取

{

unsigned char read_data;

start();

shout(OP_READ);

read_data = shin();

stop();

return read_data;

}

unsigned char read_random(unsigned char random_addr)

// 在指定地址讀取

{

start();

shout(OP_WRITE);

shout(random_addr);

return(read_current());

}

void delayms(unsigned char ms)

// 延時子程序

{

unsigned char i;

while(ms--)

{

for(i = 0; i < 120; i++);

}

}