本帖最后由 swortering 于 2017-8-28 22:12 编辑

源代码为野火开发板提供的
uint32_t I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{  
  
  I2CTimeout = I2CT_LONG_TIMEOUT;
  
  //*((u8 *)0x4001080c) |=0x80;
  while(I2C_GetFlagStatus(EEPROM_I2Cx, I2C_FLAG_BUSY))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(9);
   }
  
  /* Send START condition */
  I2C_GenerateSTART(EEPROM_I2Cx, ENABLE);
  //*((u8 *)0x4001080c) &=~0x80;
  
  I2CTimeout = I2CT_FLAG_TIMEOUT;
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_MODE_SELECT))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(10);
   }
  
  /* Send EEPROM address for write */
  I2C_Send7bitAddress(EEPROM_I2Cx, EEPROM_ADDRESS, I2C_Direction_Transmitter);

  I2CTimeout = I2CT_FLAG_TIMEOUT;
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(11);
   }
   
/* Clear EV6 by setting again the PE bit */
  I2C_Cmd(EEPROM_I2Cx, ENABLE);   /* 为什么需要重新使能一下模块 */

  /* Send the EEPROM's internal address to write to */
  I2C_SendData(EEPROM_I2Cx, ReadAddr);  

   
  I2CTimeout = I2CT_FLAG_TIMEOUT;
  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(12);
   }
   
  /* Send STRAT condition a second time */  
  I2C_GenerateSTART(EEPROM_I2Cx, ENABLE);
  
  I2CTimeout = I2CT_FLAG_TIMEOUT;
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_MODE_SELECT))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(13);
   }
   
  /* Send EEPROM address for read */
  I2C_Send7bitAddress(EEPROM_I2Cx, EEPROM_ADDRESS, I2C_Direction_Receiver);
  
  I2CTimeout = I2CT_FLAG_TIMEOUT;
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(14);
   }
  
  /* While there is data to be read */
  while(NumByteToRead)  
  {
    if(NumByteToRead == 1)
    {
      /* Disable Acknowledgement */
      I2C_AcknowledgeConfig(EEPROM_I2Cx, DISABLE);
      
      /* Send STOP Condition */
      I2C_GenerateSTOP(EEPROM_I2Cx, ENABLE);
    }

    /* Test on EV7 and clear it */   
    I2CTimeout = I2CT_LONG_TIMEOUT;
   
                while(I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED)==0)  
                {
                        if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(3);
                }
    {      
      /* 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--;        
    }   
  }

  /* Enable Acknowledgement to be ready for another reception */
  I2C_AcknowledgeConfig(EEPROM_I2Cx, ENABLE);
  
    return 1;
}