搞不定了，求助高手，IIC读ID数据，数据读出来错误

仙景

搞不定了，求助高手，IIC读ID数据，数据读出来错误 [复制链接]

void BEKEN_I2C_Start(void)
{
      BK_SCL_H;
      BK_SDA_H;
      Delay1us;//(28us)
      BK_SDA_L;//START:when CLK is high,DATA change form high to low
      Delay1us;//延时要大于4.7us
      BK_SCL_L;//钳住I2C总线，准备发送或接收数据
      Delay1us;
}
void BEKEN_I2C_Stop(void)
{
      BK_SCL_L;//标记MPU_SCL_H
      BK_SDA_L;//STOP:when CLK is high DATA change form low to high
      Delay1us;
      BK_SCL_H;//标记MPU_SDA_H
      Delay1us;
      BK_SDA_H;//标记MPU_SCL_H
      Delay1us;
}
u8 BEKEN_I2C_ReceiveACK(void)
{
      /*u16 i,j;
      i=700;
      BK_SDA_H;
      //Delayus(4);
      BK_SCL_H;
      Delay1us;
      while(BK_SDA_read)//从机拉低数据线代表收到数据
      {
            i--;//延时等待一定的时间，例如可以等待0.5毫秒或者循环读2000次ACK，如果超过这个时间没有响应，就返回失败信息
            Delay1us;
      if(i<10)
      {
         BK_SCL_L;
         return TRUE;//1
      }
      }
      BK_SCL_L;
      Delay1us;
      return FALSE;//0*/

      BK_SCL_L;
      Delay1us;
      BK_SCL_H;
      Delay1us;
      if(BK_SDA_read)
      {
            BK_SCL_L;
            return TRUE;
      }
      BK_SCL_L;
Delay1us;
      return FALSE;
}
void BEKEN_I2C_ack(void)
{
      BK_SCL_L;//标记，这里之前没有的
      BK_SDA_L;
Delay1us;
BK_SCL_H;
Delay1us;
BK_SCL_L;
Delay1us;
}
void BEKEN_I2C_nack(void)
{
      BK_SCL_L;//标记，这里之前没有的
      BK_SDA_H;
Delay1us;
BK_SCL_H;
Delay1us;
BK_SCL_L;
Delay1us;
}
void BEKEN_I2C_sendbyte(u8 val)
{
      u8 i;
      BK_SCL_L;//拉低时钟开始传输数据
      for(i=0;i<8;i++)
      {
            if(val&0x80)
                     BK_SDA_H;
            else
                     BK_SDA_L;
            val<<=1;
            BK_SCL_H;
            Delay1us;
            BK_SCL_L;
            Delay1us;
      }
}
u8 BEKEN_I2C_readbyte(void)
{
      u8 i,j,read_data=0;
      BK_SDA_H;
      for(i=0;i<8;i++)
      {
            read_data<<=1;
            BK_SCL_L;
            Delay1us;
            BK_SCL_H;
            Delay1us;
            if(BK_SDA_read)
                     read_data|=0x01;
      }
      BK_SCL_L;
return read_data;
}

/*************************************************
  Function:    BEKEN_I2c_Write
  Description: write a array
  Input:       reg: register number
               pBuff: a buffer contain written data
               len:the length of written data
  Output:       None
  Return:       None
*************************************************/
void BEKEN_I2c_Write(u8 reg,u8 *pBuf,u8 len)
{
u8 i;
u8 Addr;
Addr=dev_addr;//device address.

if(reg <= 0x0b)    //Analog registers saved by analog_reg_val[][] for read operation
{
      analog_reg_val[reg][0] = pBuf[0];
      analog_reg_val[reg][1] = pBuf[1];
      analog_reg_val[reg][2] = pBuf[2];
      analog_reg_val[reg][3] = pBuf[3];
}

BEKEN_I2C_Start();
BEKEN_I2C_sendbyte(Addr);
BEKEN_I2C_ReceiveACK();

reg=reg<<1;
BEKEN_I2C_sendbyte(reg);
BEKEN_I2C_ReceiveACK();

for(i=0;i {
      BEKEN_I2C_sendbyte(pBuf);
      BEKEN_I2C_ReceiveACK();
}
BEKEN_I2C_Stop();

}

/*************************************************
  Function:    BEKEN_I2c_Read
  Description: read a array
  Input:       reg: register number
               len:the length of read data

  Output:       pBuff: a buffer contain read data
  Return:       None
*************************************************/

void BEKEN_I2c_Read(u8 reg,u8 *pBuf,u8 len)
{
u8 i;
u8 Addr;
u8 temp;
Addr=dev_addr;//device address.

if(reg <= 0x0b)       //Analog registers not read directly from chip,recalled from analog_reg_val[][]
{
         pBuf[0] = analog_reg_val[reg][0];
      pBuf[1] = analog_reg_val[reg][1];
      pBuf[2] = analog_reg_val[reg][2];
      pBuf[3] = analog_reg_val[reg][3];
}
      else
      {
            BEKEN_I2C_Start();
            BEKEN_I2C_sendbyte(Addr);
            BEKEN_I2C_ReceiveACK();

            reg=reg<<1;
            reg|=0x01;
            BEKEN_I2C_sendbyte(reg);
            BEKEN_I2C_ReceiveACK();

            for(i=0;i             {
                     pBuf = BEKEN_I2C_readbyte();
                     BEKEN_I2C_ack();
                     temp =       pBuf;
            }
            pBuf = BEKEN_I2C_readbyte();
            BEKEN_I2C_nack();
            temp =       pBuf;

            BEKEN_I2C_Stop();
      }

      if(reg==0x21)//reg0x10[31:16]=SW_VERSION_NO
      {
            pBuf[0] =(u8)((SW_VERSION_NO&0xff00)>>8);
            pBuf[1] =(u8)(SW_VERSION_NO&0x00ff);
            #ifdef DEBUG_INFO
            pBuf[0] =(u8)((debug_info&0xff00)>>8);
            pBuf[1] =(u8)(debug_info&0x00ff);
            #endif
      }
}

图片上面是别人的样机，下面是我写的