i2c.c

LWIP在STM32裸机上的移植

  while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  I2C_SendData(I2C1, (pData & 0xFF00)>>8);	 //发送高8位数据 
  while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  I2C_SendData(I2C1, (pData & 0xFF));		 //发送低8位数据 
  while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  I2C_GenerateSTOP(I2C1, ENABLE);
}

/******************************************************************************
* Function Name  : I2C_ByteWrite
* Description    :
* Input			 :     
*                - Addr_device 	: 从器件地址
*                - Addr_data 	: 数据的内部地址
* 				 - data 		: 要写入的数据
******************************************************************************/
//void I2C_ByteWrite(u8* pBuffer, u8 WriteAddr)
void I2C_ByteWrite(u8 Addr_device,u8 Addr_data,u8 data)
{
  I2C_GenerateSTART(I2C1, ENABLE);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));  

  //发送7位从机地址
  I2C_Send7bitAddress(I2C1, Addr_device, I2C_Direction_Transmitter);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
      
  //发送数据的内部地址
  I2C_SendData(I2C1, Addr_data);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  //发送要写的数据
  I2C_SendData(I2C1, data); 
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
  
  I2C_GenerateSTOP(I2C1, ENABLE);
}

/******************************************************************************
* Function Name  : I2C_EE_ClearWrite
* Description    : 清零一块区域
* 				 : 清空区域的字节个数不能大于页面大小
* Input			 :
*                - WriteAddr 	  : EEPROM的内部地址
*                - NumByteToWrite : 要写的字节个数，不能超过255
******************************************************************************/
void I2C_EE_ClearWrite(u16 WriteAddr, u8 NumByteToWrite)
{ 
  while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
    
  I2C_GenerateSTART(I2C1, ENABLE);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); 
  
  I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); 
    
  I2C_SendData(I2C1,(WriteAddr & 0xff00)>>8);//发送前8位地址  
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));  

  I2C_SendData(I2C1,(WriteAddr & 0xff));	 //发送后8位地址  
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  while(NumByteToWrite--) 			 
  {
    I2C_SendData(I2C1, 0); 					 //清零
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
  }

  I2C_GenerateSTOP(I2C1, ENABLE);
}

/******************************************************************************
* Function Name  : I2C_EE_PageWrite
* Description    : 连续写多个字节函数
* 				 : 在一个单独的写周期内向EEPROM写入几个字节，字节个数不能大于页面大小
* Input			 :
*				 - pBuffer 		  : 指向包含要写入EEPROM的数据的缓冲区
*                - WriteAddr 	  : EEPROM的内部地址
*                - NumByteToWrite : 要写的字节个数，不能超过255
******************************************************************************/
void I2C_EE_PageWrite(u8* pBuffer, u16 WriteAddr, u8 NumByteToWrite)
{
  /*测试总线忙标志位*/  
  while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
    
  /*发送开始条件*/
  I2C_GenerateSTART(I2C1, ENABLE);
  
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); 
  
  /*发送从机地址*/
  I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

  /*发送EEPROM在要写入数据的内部地址*/    
  //I2C_SendData(I2C1, WriteAddr);  
    
  //新加的语句
  I2C_SendData(I2C1, (WriteAddr&0xff00)>>8);// 发送前8位地址  
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));  

  I2C_SendData(I2C1, (WriteAddr&0xff));		// 发送后8位地址  
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /*写入数据操作*/
  while(NumByteToWrite--)  
  {
    I2C_SendData(I2C1, *pBuffer); 
    pBuffer++; 
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
  }

  /*发送停止位*/
  I2C_GenerateSTOP(I2C1, ENABLE);
}

/******************************************************************************
* Function Name  : I2C_EE_BufferRead
* Description    : 从EEPROM中读取一个或者多个连续字节数据
* Input			 :
* 				 - pBuffer 		 : 指向包含要写入EEPROM的数据的缓冲区
* 				 - ReadAddr 	 : 要读取数据的EEPROM的内部地址
* 				 - NumByteToRead : 要读取的数据总量
******************************************************************************/
void I2C_EE_BufferRead(u8* pBuffer, u16 ReadAddr, u16 NumByteToRead)
{   
  while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
       
  /* Send START condition */
  I2C_GenerateSTART(I2C1, ENABLE);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

  /* Send EEPROM address for write */
  I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
  
  /* Clear EV6 by setting again the PE bit */
  I2C_Cmd(I2C1, ENABLE);

  /* Send the EEPROM's internal address to write to */
  //I2C_SendData(I2C1, ReadAddr); 
    
  I2C_SendData(I2C1, (ReadAddr&0xff00)>>8);	// 发送前8位地址  
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); 

  I2C_SendData(I2C1, (ReadAddr&0xff));		// 发送后8位地址
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
  
  /* Send STRAT condition a second time */  
  I2C_GenerateSTART(I2C1, ENABLE);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
  
  /* Send EEPROM address for read */
  I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Receiver);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
  
  /* While there is data to be read */
  while(NumByteToRead)  
  {
    if(NumByteToRead == 1)
    {
      /*失能应答*/
      I2C_AcknowledgeConfig(I2C1, DISABLE);
      
      /* Send STOP Condition */
      I2C_GenerateSTOP(I2C1, ENABLE);
    }

    /* Test on EV7 and clear it */
    if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))  
    {      
      /* Read a byte from the EEPROM */
      *pBuffer = I2C_ReceiveData(I2C1);

      /* 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(I2C1, ENABLE);
}

/******************************************************************************
* Function Name  : I2C_EE_WaitEepromStandbyState
* Description    : 等待EEPROM的准备状态
* Input			 : None
******************************************************************************/
void I2C_EE_WaitEepromStandbyState(void)  
{
  vu16 SR1_Tmp = 0;

  do
  {
    /*发送开始条件*/
    I2C_GenerateSTART(I2C1, ENABLE);
    
	/*读取I2C1的状态寄存器1状态*/
    SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1);
    
	/*为写发送EEPROM写地址*/
    I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  }
  while(!(I2C_ReadRegister(I2C1, I2C_Register_SR1) & 0x0002));
  
  /*清应答错误标志位*/
  I2C_ClearFlag(I2C1, I2C_FLAG_AF);
    
  /*产生停止条件*/    
  I2C_GenerateSTOP(I2C1, ENABLE); 
}