AT32F421硬件I2C官方库驱动异常

I2C_StatusType I2C_Mem_Read(I2C_Type* I2Cx, uint8_t SlaAddr, uint32_t ReadAddr, uint8_t ReadAddrSize, uint8_t *pBuffer, uint16_t NumByteToRead, uint32_t Timeout)

{

  /* Wait until BUSY flag is reset */

  if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_BUSYF, SET, I2C_EVT_CHECK_NONE, I2C_TIMEOUT_BUSY_FLAG) != I2C_OK)

  {

    return I2C_ERROR_STEP_1;

  }



  /* Disable Pos */

  I2C_NACKPositionConfig(I2Cx, I2C_NACKPosition_Current);



  /* Enable Acknowledge */

  I2C_AcknowledgeConfig(I2Cx, ENABLE);



  /* Send START condition */

  I2C_GenerateSTART(I2Cx, ENABLE);



  /* Wait until SB flag is set */

  if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_STARTF, RESET, I2C_EVT_CHECK_NONE, Timeout) != I2C_OK)

  {

    /* Send STOP Condition */

    I2C_GenerateSTOP(I2Cx, ENABLE);



    return I2C_ERROR_STEP_2;

  }



  /* Send slave address for write */

  I2C_Send7bitAddress(I2Cx, SlaAddr, I2C_Direction_Transmit);



 /* Wait until ADDR flag is set */

  if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_ADDRF, RESET, I2C_EVT_CHECK_NONE, Timeout) != I2C_OK)

  {

    /* Send STOP Condition */

    I2C_GenerateSTOP(I2Cx, ENABLE);



    return I2C_ERROR_STEP_3;

  }



  /* Clear ADDR flag */

  I2C_ClearADDRFlag(I2Cx);



  /* Wait until TDE flag is set */

  if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_TDE, RESET, I2C_EVT_CHECK_NONE, Timeout) != I2C_OK)

  {

    /* Send STOP Condition */

    I2C_GenerateSTOP(I2Cx, ENABLE);



    return I2C_ERROR_STEP_4;

  }



  if(ReadAddrSize == I2C_MEMADD_SIZE_32BIT)

  {

          I2C_SendData(I2Cx, (uint8_t)(ReadAddr >> 24));



          if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_TDE, RESET, I2C_EVT_CHECK_ACKFAIL, Timeout) != I2C_OK)

          {

            I2C_GenerateSTOP(I2Cx, ENABLE);

            return I2C_ERROR_STEP_5;

          }



          ReadAddrSize -= 1;

  }



  if(ReadAddrSize == I2C_MEMADD_SIZE_24BIT)

  {

          I2C_SendData(I2Cx, (uint8_t)(ReadAddr >> 16));



          if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_TDE, RESET, I2C_EVT_CHECK_ACKFAIL, Timeout) != I2C_OK)

          {

            I2C_GenerateSTOP(I2Cx, ENABLE);

            return I2C_ERROR_STEP_5;

          }



          ReadAddrSize -= 1;

  }



  if(ReadAddrSize == I2C_MEMADD_SIZE_16BIT)

  {

          I2C_SendData(I2Cx, (uint8_t)(ReadAddr >> 8));



          if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_TDE, RESET, I2C_EVT_CHECK_ACKFAIL, Timeout) != I2C_OK)

          {

            I2C_GenerateSTOP(I2Cx, ENABLE);

            return I2C_ERROR_STEP_5;

          }

  }



  /* Send Memory Address */

  I2C_SendData(I2Cx, ReadAddr);



  /* Wait until TDE flag is set */

  if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_TDE, RESET, I2C_EVT_CHECK_ACKFAIL, Timeout) != I2C_OK)

  {

    /* Send STOP Condition */

    I2C_GenerateSTOP(I2Cx, ENABLE);



    return I2C_ERROR_STEP_5;

  }



  /* Send START condition */

  I2C_GenerateSTART(I2Cx, ENABLE);



  /* Wait until SB flag is set */

  if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_STARTF, RESET, I2C_EVT_CHECK_NONE, Timeout) != I2C_OK)

  {

    /* Send STOP Condition */

    I2C_GenerateSTOP(I2Cx, ENABLE);



    return I2C_ERROR_STEP_6;

  }



  /* Send slave address for read */

  I2C_Send7bitAddress(I2Cx, SlaAddr, I2C_Direction_Receive);



  /* Wait until ADDR flag is set */

  if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_ADDRF, RESET, I2C_EVT_CHECK_ACKFAIL, Timeout) != I2C_OK)

  {

    /* Send STOP Condition */

    I2C_GenerateSTOP(I2Cx, ENABLE);



    return I2C_ERROR_STEP_7;

  }



  if(NumByteToRead == 1)

  {

    /* Disable Acknowledge */

    I2C_AcknowledgeConfig(I2Cx, DISABLE);



    /* Clear ADDR flag */

    I2C_ClearADDRFlag(I2Cx);



    /* Send STOP Condition */

    I2C_GenerateSTOP(I2Cx, ENABLE);

  }

  else if(NumByteToRead == 2)

  {

    /* Enable Pos */

    I2C_NACKPositionConfig(I2Cx, I2C_NACKPosition_Next);



    /* Clear ADDR flag */

    I2C_ClearADDRFlag(I2Cx);



    /* Disable Acknowledge */

    I2C_AcknowledgeConfig(I2Cx, DISABLE);

  }

  else

  {

    /* Enable Acknowledge */

    I2C_AcknowledgeConfig(I2Cx, ENABLE);



    /* Clear ADDR flag */

    I2C_ClearADDRFlag(I2Cx);

  }



  while(NumByteToRead > 0)

  {

    if(NumByteToRead <= 3)

    {

      /* One byte */

      if(NumByteToRead == 1)

      {

        /* Wait until RXNE flag is set */

        if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_RDNE, RESET, I2C_EVT_CHECK_NONE, Timeout) != I2C_OK)

        {

          /* Send STOP Condition */

          I2C_GenerateSTOP(I2Cx, ENABLE);



          return I2C_ERROR_STEP_8;

        }



        /* Read data from DR */

        (*pBuffer++) = I2C_ReceiveData(I2Cx);

        NumByteToRead--;

      }

      /* Two bytes */

      else if(NumByteToRead == 2)

      {

        /* Wait until BTF flag is set */

        if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_BTFF, RESET, I2C_EVT_CHECK_NONE, Timeout) != I2C_OK)

        {

          /* Send STOP Condition */

          I2C_GenerateSTOP(I2Cx, ENABLE);



          return I2C_ERROR_STEP_9;

        }



        /* Send STOP Condition */

        I2C_GenerateSTOP(I2Cx, ENABLE);



        /* Read data from DR */

        (*pBuffer++) = I2C_ReceiveData(I2Cx);

        NumByteToRead--;



        /* Read data from DR */

        (*pBuffer++) = I2C_ReceiveData(I2Cx);

        NumByteToRead--;

      }

      /* 3 Last bytes */

      else

      {

        /* Wait until BTF flag is set */

        if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_BTFF, RESET, I2C_EVT_CHECK_NONE, Timeout) != I2C_OK)

        {

          /* Send STOP Condition */

          I2C_GenerateSTOP(I2Cx, ENABLE);



          return I2C_ERROR_STEP_10;

        }



        /* Disable Acknowledge */

        I2C_AcknowledgeConfig(I2Cx, DISABLE);



        /* Read data from DR */

        (*pBuffer++) = I2C_ReceiveData(I2Cx);

        NumByteToRead--;



        /* Wait until BTF flag is set */

        if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_BTFF, RESET, I2C_EVT_CHECK_NONE, Timeout) != I2C_OK)

        {

          /* Send STOP Condition */

          I2C_GenerateSTOP(I2Cx, ENABLE);



          return I2C_ERROR_STEP_11;

        }



        /* Send STOP Condition */

        I2C_GenerateSTOP(I2Cx, ENABLE);



        /* Read data from DR */

        (*pBuffer++) = I2C_ReceiveData(I2Cx);

        NumByteToRead--;



        /* Read data from DR */

        (*pBuffer++) = I2C_ReceiveData(I2Cx);

        NumByteToRead--;

      }

    }

    else

    {

      /* Wait until RXNE flag is set */

      if(I2C_WaitOnFlagUntilTimeout(I2Cx, I2C_FLAG_RDNE, RESET, I2C_EVT_CHECK_NONE, Timeout) != I2C_OK)

      {

        /* Send STOP Condition */

        I2C_GenerateSTOP(I2Cx, ENABLE);



        return I2C_ERROR_STEP_12;

      }



      /* Read data from DR */

      (*pBuffer++) = I2C_ReceiveData(I2Cx);

      NumByteToRead--;

    }

  }



  return I2C_OK;

}