藍橋杯-CT107單片機綜合實訓平臺-IIC

ID:142045 · 發表于 2019-3-21 09:07

/*
  程序說明: IIC總線驅動程序
  軟件環境: Keil uVision 4.10
  硬件環境: CT107單片機綜合實訓平臺 8051，12MHz
  日期: 2011-8-9
*/

#include "reg52.h"
#include "intrins.h"

#define DELAY_TIME 5

#define SlaveAddrW 0xA0
#define SlaveAddrR 0xA1

//總線引腳定義
sbit SDA = P2^1;  /* 數據線 */
sbit SCL = P2^0;  /* 時鐘線 */

void IIC_Delay(unsigned char i)
{
do{_nop_();}
while(i--);
}
//總線啟動條件
void IIC_Start(void)
{
SDA = 1;
SCL = 1;
IIC_Delay(DELAY_TIME);
SDA = 0;
IIC_Delay(DELAY_TIME);
SCL = 0;
}

//總線停止條件
void IIC_Stop(void)
{
SDA = 0;
SCL = 1;
IIC_Delay(DELAY_TIME);
SDA = 1;
IIC_Delay(DELAY_TIME);
}

//發送應答
void IIC_SendAck(bit ackbit)
{
SCL = 0;
SDA = ackbit;    // 0：應答，1：非應答
IIC_Delay(DELAY_TIME);
SCL = 1;
IIC_Delay(DELAY_TIME);
SCL = 0;
SDA = 1;
IIC_Delay(DELAY_TIME);
}

//等待應答
bit IIC_WaitAck(void)
{
bit ackbit;

SCL  = 1;
IIC_Delay(DELAY_TIME);
ackbit = SDA;
SCL = 0;
IIC_Delay(DELAY_TIME);
return ackbit;
}

//通過I2C總線發送數據
void IIC_SendByte(unsigned char byt)
{
unsigned char i;

for(i=0; i<8; i++)
{
      SCL  = 0;
      IIC_Delay(DELAY_TIME);
      if(byt & 0x80) SDA  = 1;
      else SDA  = 0;
      IIC_Delay(DELAY_TIME);
      SCL = 1;
      byt <<= 1;
      IIC_Delay(DELAY_TIME);
}
SCL  = 0;
}

//從I2C總線上接收數據
unsigned char IIC_RecByte(void)
{
unsigned char i, da;
for(i=0; i<8; i++)
{
SCL = 1;
IIC_Delay(DELAY_TIME);
da <<= 1;
if(SDA) da |= 1;
SCL = 0;
IIC_Delay(DELAY_TIME);
}
return da;
}

帳號		自動登錄	找回密碼
密碼			立即注冊

久久久久久久999_99精品久久精品一区二区爱城_成人欧美一区二区三区在线播放_国产精品日本一区二区不卡视频_国产午夜视频_欧美精品在线观看免费

藍橋杯-CT107單片機綜合實訓平臺-IIC