藍(lán)橋杯-CT107單片機綜合實訓(xùn)平臺-IIC

ID:142045 · 發(fā)表于 2019-3-21 09:07

/*
  程序說明: IIC總線驅(qū)動程序
  軟件環(huán)境: Keil uVision 4.10
  硬件環(huán)境: CT107單片機綜合實訓(xùn)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(shù)據(jù)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(fā)送應(yīng)答
void IIC_SendAck(bit ackbit)
{
SCL = 0;
SDA = ackbit;    // 0：應(yīng)答，1：非應(yīng)答
IIC_Delay(DELAY_TIME);
SCL = 1;
IIC_Delay(DELAY_TIME);
SCL = 0;
SDA = 1;
IIC_Delay(DELAY_TIME);
}

//等待應(yīng)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(fā)送數(shù)據(jù)
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(shù)據(jù)
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;
}

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藍(lán)橋杯-CT107單片機綜合實訓(xùn)平臺-IIC