IIC的应用

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主函数文件：

#include <reg52.h>#include "./delay/delay.h"sbit SCL = P2^1;sbit SDA = P2^2;bit ack = 0;#define SUCC 1#define ERR  0void iic_start(){  SDA = 1;  SCL = 1;  delay_us(1);  SDA = 0;  delay_us(1);  SCL = 0; }void iic_stop(){  SDA = 0;  SCL = 1;  delay_us(1);  SDA = 1;  delay_us(1);  SCL = 0;}bit iic_send_byte(unsigned char byte){  unsigned char i;  for(i = 0; i < 8; i++)  {  SDA = byte & 0x80;     SCL = 1;  delay_us(1);  SCL = 0;  delay_us(1);  byte <<= 1;}SCL = 1;SDA = 1;delay_us(1);if(0 == SDA){  ack = 1;}else{  ack = 0;}SCL = 0;return ack;}unsigned char iic_rcv_byte(){  unsigned char i;  unsigned char temp;  unsigned char a;  SDA = 1;  for(i = 0; i < 8; i++)  {  SCL = 0;  delay_us(1);  SCL = 1;  if(SDA){  a = 0x01;}else{  a = 0;}temp |= (a <<(7 - i));delay_us(1);  }SCL = 0;return temp;}void iic_ack(){  SDA = 0;  SCL = 1;  delay_us(1);    SCL = 0;}void iic_noack(){  SDA = 1;  SCL = 1;  delay_us(1);   SCL = 0;}unsigned char AT24C02_send_str(unsigned char devaddr,unsigned char romaddr,unsigned char *s,unsigned char num){  unsigned char i;  iic_start();  iic_send_byte(devaddr);  if(0 == ack) return ERR;  iic_send_byte(romaddr);  if(0 == ack) return ERR;  for(i = 0; i < num; i++)  {  iic_send_byte(*s);  if(0 == ack) return ERR;  s++;}iic_stop();return SUCC;}unsigned char AT24C02_rcv_byte(unsigned char devaddr,unsigned char romaddr,unsigned char *s,unsigned char num){  unsigned char i;  iic_start();  iic_send_byte(devaddr);  if(0 == ack) return ERR;  iic_send_byte(romaddr);  if(0 == ack) return ERR;  iic_start();  iic_send_byte(devaddr + 1);  for(i = 0; i < num - 1; i++)  {  *s = iic_rcv_byte();  iic_ack();  s++;}*s = iic_rcv_byte();iic_noack();iic_stop();return SUCC;}void main(){  unsigned char test[10] = {'1','2','3','4','5','6','7','8','9'};    unsigned char temp[10];     AT24C02_send_str(0xae,100,test,10);    delay_ms(200);    AT24C02_rcv_byte(0xae,100,temp,10);  while(1){   iic_start();   iic_send_byte(0xae);   iic_stop();   delay_ms(5);}}

延时函数文件：

void delay_us(unsigned char t){    while(--t);}void delay_ms(unsigned char t){    while(t--){        delay_us(245);  delay_us(245);    }}void delay_s(unsigned char t){    while(t--)    {    delay_ms(200);  delay_ms(200);  delay_ms(200);  delay_ms(200);  delay_ms(200);    }}

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