软件模拟I2C读写X1226程序-EDA365

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软件模拟I2C读写X1226程序

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采用C51编写,程序通过测试,现已成功用于项目中.适用于所有的51内核单片机,可以移植到别的单片机上,修改很少,我已经移植到430单片机上.

声明:本代码为个人原创,若要转载请注明出处!

sbit bI2C_SDA = P0^4; // SDA
sbit bI2C_SCL = P1^0; // SCL

#define  T1  5
#define  T2  10
#define  T3  15
#define  T5  25

//----------------------------------------------------------------------------

void I2CInit (void)
{
bI2C_SCL = 0;
I2CDelay(T2);
bI2C_SDA = 1;
I2CDelay(T2);
bI2C_SCL = 1;
I2CDelay(T2);
bI2C_SCL = 0;
I2CDelay(T2);
bI2C_SDA = 0;
I2CDelay(T2);
bI2C_SCL = 1;
I2CDelay(T2);
bI2C_SCL = 0;
I2CDelay(T2);
I2CStop();
}
//----------------------------------------------------------------------------
//名称：I2CDelay
//功能：I2C中的延时
//入口：无
//出口：无
//----------------------------------------------------------------------------
void I2CDelay ( uint i )
{
while(i)
{
i--;
}
}

void msDelay (uint ms)
{
while(ms)
{
  I2CDelay(9000);
  ms--;
}
}
//----------------------------------------------------------------------------
//名称：I2CStart
//功能：I2C的启动
//入口：无
//出口：无
//----------------------------------------------------------------------------
void I2CStart (void)
{
bI2C_SDA = 1;
    I2CDelay(T2);
bI2C_SCL = 1;
I2CDelay(T2);
bI2C_SDA = 0;
I2CDelay(T2);
bI2C_SCL = 0;
I2CDelay(T2);
}
//----------------------------------------------------------------------------
//名称：I2CStop
//功能：I2C的停止
//入口：无
//出口：无
//----------------------------------------------------------------------------
void I2CStop (void)
{
bI2C_SDA = 0;
I2CDelay(T2);
bI2C_SCL = 1;
I2CDelay(T2);
bI2C_SDA = 1;
I2CDelay(T2);

bI2C_SCL = 0;
I2CDelay(T2);
}
//----------------------------------------------------------------------------
//名称：SendACK
//功能：主机给出ACK信号
//入口：无
//出口：出
//----------------------------------------------------------------------------
void SendACK ( void )
{
bI2C_SDA = 0;
I2CDelay(T3);
bI2C_SCL = 1;
I2CDelay(T3);
bI2C_SCL = 0;
I2CDelay(T3);
}
//----------------------------------------------------------------------------
//名称：SendNoACK
//功能：主机不给出ACK信号,而将SDA拉高
//入口：无
//出口：出
//----------------------------------------------------------------------------
void SendNoACK ( void )
{
bI2C_SCL = 0;
I2CDelay(T3);
bI2C_SDA = 1;
I2CDelay(T3);
bI2C_SCL = 1;
I2CDelay(T3);
bI2C_SCL = 0;
}
//----------------------------------------------------------------------------
//名称：WaitACK
//功能：等待接收ACK信号
//入口：无
//出口：返回值为0,代表接收失败;返回值为1,代表接收成功
//----------------------------------------------------------------------------
/*
void WaitACK ( void )
{
bI2C_SDA = 1;
I2CDelay();
I2CDelay();
bI2C_SCL = 1;
I2CDelay();
I2CDelay();
bI2C_SCL = 0;
I2CDelay();
I2CDelay();
}
*/
//----------------------------------------------------------------------------
//名称：I2CWrByte
//功能：主机发送一个字节的数据
//入口：ucSendData,要发送的数据
//中间寄存器：ACC
//出口：无
//----------------------------------------------------------------------------
void I2CWrByte ( uchar ucSendData )
{
uchar i = 8;
while ( i-- )
{
  bI2C_SCL = 0;
  I2CDelay(T1);
  bI2C_SDA = (ucSendData&0x80);
  ucSendData <<= 1;
  I2CDelay(T1);
  bI2C_SCL = 1;
  I2CDelay(T1);
}
bI2C_SCL = 0;
I2CDelay(T2);
bI2C_SCL = 1;
I2CDelay(T2);
bI2C_SCL = 0;

}
//----------------------------------------------------------------------------
//名称：I2CRdByte
//功能：主机从I2C总线上接收一个字节的数据
//入口：无
//中间寄存器：ACC
//出口：ucReceiveData,接收到的数据
//----------------------------------------------------------------------------
uchar I2CRdByte ( void )
{
uchar i = 8;
uchar ucRecivData = 0;
bI2C_SCL = 0;
I2CDelay(T2);
bI2C_SDA = 1;
while(i--)
{
  ucRecivData <<= 1;
  bI2C_SCL = 1;
  I2CDelay(T3);
  if(bI2C_SDA)
   ucRecivData = 0x01;
  else
   ucRecivData &= 0xFE;
  bI2C_SCL = 0;
  I2CDelay(T3);
}
return ucRecivData;
}
//----------------------------------------------------------------------------
//名称：EnableWrite1226
//功能：向X1226的状态寄存器写初始置,以允许对其他寄存器写
//入口：无
//出口：无
//----------------------------------------------------------------------------
void EnableRTC ( bit bFlag )
{
I2CStart();
I2CWrByte(0xde);
I2CDelay(T2);
I2CWrByte(0x00);
I2CDelay(T2);
I2CWrByte(0x3f);
I2CDelay(T2);
I2CWrByte(0x02);
I2CDelay(T2);
I2CStop();
if(bFlag==1)
{
  I2CStart();
  I2CWrByte(0xde);
  I2CDelay(T2);
  I2CWrByte(0x00);
  I2CDelay(T2);
  I2CWrByte(0x3f);
  I2CDelay(T2);
  I2CWrByte(0x06);
  I2CDelay(T2);
  I2CStop();
}
}
//----------------------------------------------------------------------------
//名称：DisableWrite1226
//功能：将X1226的状态寄存器清零,以禁止对其他寄存器写
//入口：无
//出口：无
//----------------------------------------------------------------------------
void DisableWrite1226 ( void )
{
I2CStart();
I2CWrByte(0xde);
I2CDelay(T2);
I2CWrByte(0x00);
I2CDelay(T2);
I2CWrByte(0x3f);
I2CDelay(T2);
I2CWrByte(0x00);
I2CDelay(T2);
I2CStop();
}
//----------------------------------------------------------------------------
//        读E2PROM
//E2PAddr－－－要访问的首地址
//ByteNum－－－要读取的字节个数
//pFistData－－从E2PROM主读出的数据在内存中存放的首地址
//----------------------------------------------------------------------------
void RdE2p (uint E2PAddr,uchar ByteNum,uchar *pFistData)
{
uchar i;
//    EnableRTC ( 0 );
I2CStart();
I2CWrByte(0xae);
I2CDelay(T2);
I2CWrByte((uchar)(E2PAddr>>8));
I2CDelay(T2);
I2CWrByte((uchar)E2PAddr);
I2CStart();
I2CWrByte(0xaf);
I2CDelay(T2);
for( i=0;i {
*pFistData = I2CRdByte();
  pFistData++;
  if( i+1    SendACK();
}
SendNoACK();
I2CStop();
}
//----------------------------------------------------------------------------
//        写E2PROM
//E2PAddr－－－要访问的首地址
//ByteNum－－－要写入的字节个数
//pFistData－－从写入的数据在内存中存放的首地址
//----------------------------------------------------------------------------
void WrE2p (uint E2PAddr,uchar ByteNum,uchar *pFistData)
{
uchar i;
EnableRTC ( 1 );
I2CStart();
I2CWrByte(0xae);
I2CDelay(T5);
I2CWrByte((uchar)(E2PAddr>>8));
I2CDelay(T5);
I2CWrByte((uchar)E2PAddr);
I2CDelay(T5);
for( i=0;i {
  I2CWrByte(*pFistData++);
}
I2CStop();
}
//----------------------------------------------------------------------------