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MSP430模擬IIC接口程序

MSP430模擬IIC接口程序

作者:jdzj868 來源:機電之家下載站錄入:jdzj868 更新時間：2009-12-7 16:58:31 點擊數(shù)：0

【字體：

】

1-簡介
  MSP430單片機普通II模擬IIC接口程序范例。

2-程序例程

    #include "MSP430x14x.h"

    //P3.2 SCL

    //P3.3 SDA

    #define SDA_1 P3OUT |= BIT3         //SDA = 1

    #define SDA_0 P3OUT &=~ BIT3        //SDA = 0

    #define SCL_1 P3OUT |= BIT2         //SCL = 1

    #define SCL_0 P3OUT &=~ BIT2        //SCL = 0

    #define DIR_IN P3DIR &=~ BIT3; SDA_1 //I/O口為輸入

    #define DIR_OUT P3DIR |= BIT3        //I/0口為輸出

    #define SDA_IN ((P3IN >> 3) & 0x01) //Read SDA

    unsigned int a[50];

//*****************************************************

    static void Delay(unsigned int n)
    {
      unsigned int i;
      for (i=0; i }
      void Init(void)
    {
     SCL_1;
    Delay(5);
    SDA_1;
    Delay(5);
    }

//*****************************************************
    void Start(void)
    {
    SDA_1;
    Delay(5);
    SCL_1;
    Delay(5);
    SDA_0;
    Delay(5);
    SCL_0;
    Delay(5);
    }

//*****************************************************
    void Stop(void)
    {
    SDA_0;
    Delay(5);
    SCL_1;
    Delay(5);
    SDA_1;
    Delay(5);
    }

//*****************************************************
    void WriteByte(unsigned char WriteData)
    {
    unsigned char i;
    for (i=0; i<8; i++)
      {
      SCL_0;
      Delay(5);
      if (((WriteData >> 7) & 0x01) == 0x01)
       {
        SDA_1;
        }
      else
       {
        SDA_0;
       }
       Delay(5);
       SCL_1;
       WriteData = WriteData << 1;
       Delay(5);
      }
      SCL_0;
      SDA_1;
      Delay(5);
      Delay(5);
    }

//*****************************************************
    unsigned char ReadByte(void)
    {
    unsigned char i;
    unsigned char TempBit = 0;
    unsigned char TempData = 0;
    SCL_0;
    Delay(5);
    SDA_1;
    for (i=0; i<8; i++)
    {
    Delay(5);
    SCL_1;
    Delay(5);
    DIR_IN;
    if (SDA_IN == 0x01 )   /*sda==1*/
      {
       TempBit = 1;
      }
    else
    {
      TempBit = 0;
    }
      DIR_OUT;
      TempData = (TempData << 1) | TempBit;
      SCL_0;
    }
    Delay(5);
    return(TempData);
   }

//*****************************************************
    void ReceiveAck(void)
    {
    unsigned char i = 0;
    SCL_1;
    Delay(5);
    DIR_IN;
    while ((SDA_IN == 0x01 /*sda==1*/) && (i < 255))   /*調(diào)試方便,可以不要*/
    {
       i++;
    }
    DIR_OUT;
    SCL_0;
    Delay(5);
    }

//*****************************************************
    void Acknowledge(void)
    {
    SCL_0;
    Delay(5);
    DIR_OUT;
    SDA_0;
    SCL_1;
     Delay(5);
    SCL_0;
    }

//*****************************************************
    unsigned int ReadWord(unsigned char unit/*address*/)
    {
    unsigned char HighData = 0;
    unsigned char LowData = 0;
    unsigned int TempData = 0;
    Start();
    WriteByte(0xa0);
    ReceiveAck();
    WriteByte(unit);
    ReceiveAck();
    Start();
    WriteByte(0xa1);
    ReceiveAck();
    LowData = ReadByte();
    Acknowledge();
    HighData = ReadByte();
    Stop();
    TempData = (HighData << 8) + LowData;
    Delay(1000);
    return(TempData);
    }

//*****************************************************
    void ReadWords(unsigned char unit)   /*address*/
    {
    unsigned char i;
    unsigned char HighData = 0;
    unsigned char LowData = 0;
    unsigned int TempData = 0;
    Start();
    WriteByte(0xa0);
    ReceiveAck();
    WriteByte(unit);
    ReceiveAck();
    Start();
    WriteByte(0xa1);
    ReceiveAck();
    for (i=0; i<49; i++)
    {
      LowData = ReadByte();
      Acknowledge();
      HighData = ReadByte();
      Acknowledge();
      a[i]= (HighData << 8) + LowData;
    }
    LowData = ReadByte();
    Acknowledge();
    HighData = ReadByte();
    Stop();
    a[49] = (HighData << 8) + LowData;
    Delay(1000);
    }

//*****************************************************
    void WriteWord(unsigned char unit/*address*/, unsigned int WriteData)
    {
    unsigned char LowData = 0;
    unsigned char HighData = 0;
    LowData = (unsigned char)WriteData;
    HighData = (unsigned char)(WriteData >> 8);
    Start();
    WriteByte(0xa0);
    ReceiveAck();
    WriteByte(unit);
    ReceiveAck();
    WriteByte(LowData);
    ReceiveAck();
    WriteByte(HighData);
    ReceiveAck();
    Stop();
    Delay(2000);
    }
//******************************************************************************

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