[STM32F1] STM32F103 I2C硬件缺陷详述及解决方案

uint32_t I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)

{  

    

  while(I2C_GetFlagStatus(EEPROM_I2Cx, I2C_FLAG_BUSY));

  /* Send START condition */

  I2C_GenerateSTART(EEPROM_I2Cx, ENABLE);

  

  /* Test on EV5 and clear it */

  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

  

  /* Send EEPROM address for write */

  I2C_Send7bitAddress(EEPROM_I2Cx, EEPROM_ADDRESS, I2C_Direction_Transmitter);



  /* Test on EV6 and clear it */

  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    

  /* Clear EV6 by setting again the PE bit */

  I2C_Cmd(EEPROM_I2Cx, ENABLE);



  /* Send the EEPROM's internal address to write to */

  I2C_SendData(EEPROM_I2Cx, ReadAddr);  



  /* Test on EV8 and clear it */

  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    

  /* Send STRAT condition a second time */  

  I2C_GenerateSTART(EEPROM_I2Cx, ENABLE);



  /* Test on EV5 and clear it */

  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

    

  /* Send EEPROM address for read */

  I2C_Send7bitAddress(EEPROM_I2Cx, EEPROM_ADDRESS, I2C_Direction_Receiver);



  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

  

  /* While there is data to be read */

  while(NumByteToRead)  

  {

    

                while(I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED)==0);

                

          

      /* Read a byte from the EEPROM */

      *pBuffer = I2C_ReceiveData(EEPROM_I2Cx);



      /* Point to the next location where the byte read will be saved */

      pBuffer++; 

      

      /* Decrement the read bytes counter */

      NumByteToRead--;        

      

  }





        /* Disable Acknowledgement */

        I2C_AcknowledgeConfig(EEPROM_I2Cx, DISABLE);

      

  /* Send STOP Condition */

  I2C_GenerateSTOP(EEPROM_I2Cx, ENABLE);



  /* Enable Acknowledgement to be ready for another reception */

  I2C_AcknowledgeConfig(EEPROM_I2Cx, ENABLE);

  

    return 1;

}

int main(void)

{ 

  LED_GPIO_Config();

 

  /* 串口初始化 */

        USART_Config();



        /* I2C 外设初(AT24C02)始化 */

        I2C_EE_Init();



  I2C_EE_BufferRead(I2c_Buf_Read, EEP_Firstpage, 4); 

  while (1)

  {      



  }

}

  while(NumByteToRead)  

  {

    

                if(NumByteToRead == 1)

                {

                        /* Disable Acknowledgement */

                        I2C_AcknowledgeConfig(EEPROM_I2Cx, DISABLE);

                                        

                        /* Send STOP Condition */

                        I2C_GenerateSTOP(EEPROM_I2Cx, ENABLE);

                }

                

                while(I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED)==0);

                

          

      /* Read a byte from the EEPROM */

      *pBuffer = I2C_ReceiveData(EEPROM_I2Cx);



      /* Point to the next location where the byte read will be saved */

      pBuffer++; 

      

      /* Decrement the read bytes counter */

      NumByteToRead--;        

      

  }