IIC的应用

最新推荐文章于 2025-06-08 14:00:12 发布

root_robot

最新推荐文章于 2025-06-08 14:00:12 发布

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CC 4.0 BY-SA版权

分类专栏：单片机文章标签：单片机 IIC

本文链接：https://blog.youkuaiyun.com/root_robot/article/details/52610586

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  0

void 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
				{