i2c_ee.c

来自「基于STM32F107的UDP服务器程序」· C语言 代码 · 共 493 行 · 第 1/2 页

  
  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /* Send the byte to be written */
  I2C_SendData(I2C1, *pBuffer); 
   
  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
  
  /* Send STOP condition */
  I2C_GenerateSTOP(I2C1, ENABLE);
}

/*******************************************************************************
* Function Name  : I2C_EE_PageWrite
* Description    : Writes more than one byte to the EEPROM with a single WRITE
*                  cycle. The number of byte can't exceed the EEPROM page size.
* Input          : - pBuffer : pointer to the buffer containing the data to be 
*                    written to the EEPROM.
*                  - WriteAddr : EEPROM's internal address to write to.
*                  - NumByteToWrite : number of bytes to write to the EEPROM.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)
{
    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); // Added by Najoua 27/08/2008
    
  /* Send START condition */
  I2C_GenerateSTART(I2C1, ENABLE);
  
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); 
  
  /* Send EEPROM address for write */
  I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));  

  /* Send the EEPROM's internal address to write to */    
  I2C_SendData(I2C1, WriteAddr);  

  /* Test on EV8 and clear it */
  while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /* While there is data to be written */
  while(NumByteToWrite--)  
  {
    /* Send the current byte */
    I2C_SendData(I2C1, *pBuffer); 

    /* Point to the next byte to be written */
    pBuffer++; 
  
    /* Test on EV8 and clear it */
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
  }

  /* Send STOP condition */
  I2C_GenerateSTOP(I2C1, ENABLE);
}

/*******************************************************************************
* Function Name  : I2C_EE_BufferRead
* Description    : Reads a block of data from the EEPROM.
* Input          : - pBuffer : pointer to the buffer that receives the data read 
*                    from the EEPROM.
*                  - ReadAddr : EEPROM's internal address to read from.
*                  - NumByteToRead : number of bytes to read from the EEPROM.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{  
  //*((u8 *)0x4001080c) |=0x80; 
    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); // Added by Najoua 27/08/2008
    
    
  /* Send START condition */
  I2C_GenerateSTART(I2C1, ENABLE);
  //*((u8 *)0x4001080c) &=~0x80;
  
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

  /* Send EEPROM address for write */
  I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);

  /* Test on EV6 and clear it */
  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);  

  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
  
  /* Send STRAT condition a second time */  
  I2C_GenerateSTART(I2C1, ENABLE);
  
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
  
  /* Send EEPROM address for read */
  I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Receiver);
  
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
  
  /* While there is data to be read */
  while(NumByteToRead)  
  {
    if(NumByteToRead == 1)
    {
      /* Disable Acknowledgement */
      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    : Wait for EEPROM Standby state
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_EE_WaitEepromStandbyState(void)      
{
  vu16 SR1_Tmp = 0;

  do
  {
    /* Send START condition */
    I2C_GenerateSTART(I2C1, ENABLE);
    /* Read I2C1 SR1 register */
    SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1);
    /* Send EEPROM address for write */
    I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  }while(!(I2C_ReadRegister(I2C1, I2C_Register_SR1) & 0x0002));
  
  /* Clear AF flag */
  I2C_ClearFlag(I2C1, I2C_FLAG_AF);
    /* STOP condition */    
    I2C_GenerateSTOP(I2C1, ENABLE); // Added by Najoua 27/08/2008
}

/*******************************************************************************
* Function Name  : Buffercmp
* Description    : Compares two buffers.
* Input          : - pBuffer1, pBuffer2: buffers to be compared.
*                : - BufferLength: buffer's length
* Output         : None
* Return         : PASSED: pBuffer1 identical to pBuffer2
*                  FAILED: pBuffer1 differs from pBuffer2
*******************************************************************************/
TestStatus Buffercmp(u8* pBuffer1, u8* pBuffer2, u16 BufferLength)
{
  while(BufferLength--)
  {
    if(*pBuffer1 != *pBuffer2)
    {
      return FAILED;
    }

    pBuffer1++;
    pBuffer2++;
  }

  return PASSED;
}

TestStatus ARMJISHU_EEPROM_TEST(void)
{
  TestStatus EepromTestStatus = FAILED;

  u8 EEP_Tx_Buffer[] = "WWW.ARMJISHU.COM  I2C EEPROM AT24C02 Test";
  #define  EEPTx_BUFSIZE    sizeof(EEP_Tx_Buffer) / sizeof(EEP_Tx_Buffer[0])
  #define  EEP_Firstpage      0x00
  #define  EEP_Randompage			0x06
  u8 EEP_Rx_Buffer[EEPTx_BUFSIZE] = {0};  
  
  I2C_EE_Init();

  //printf("\r\n\n ARMJISHU_EEPROM_TEST........");  
  // Write on I2C EEPROM from EEPROM_WriteAddress0
  I2C_EE_BufferWrite(EEP_Tx_Buffer, EEP_Firstpage, EEPTx_BUFSIZE-1);
  // Read from I2C EEPROM from EEPROM_ReadAddress0
  I2C_EE_BufferRead(EEP_Rx_Buffer, EEP_Firstpage, EEPTx_BUFSIZE-1);
  // Check if the data written to the memory is read correctly
  EepromTestStatus = Buffercmp(EEP_Tx_Buffer, EEP_Rx_Buffer, EEPTx_BUFSIZE-1);
  
  // Write on I2C EEPROM from EEPROM_WriteAddress2
  printf("\r\n\n I2C_EE_BufferWrite EEP_Tx_Buffer: [%s]", EEP_Tx_Buffer);
  I2C_EE_BufferWrite(EEP_Tx_Buffer, EEP_Randompage, EEPTx_BUFSIZE-1);
  // Read from I2C EEPROM from EEPROM_ReadAddress2
  I2C_EE_BufferRead(EEP_Rx_Buffer, EEP_Randompage, EEPTx_BUFSIZE-1);
  printf("\r\n I2C_EE_BufferRead  EEP_Rx_Buffer: [%s]", EEP_Rx_Buffer);
  // Check if the data written to the memory is read correctly
  EepromTestStatus &= Buffercmp(EEP_Tx_Buffer, EEP_Rx_Buffer, EEPTx_BUFSIZE-1);
      
  if(FAILED == EepromTestStatus)
  {
    printf("\r\n FAILED-->The data written to the Randompage memory is read Error!\n\r"); 
  }
  else
  {
    printf("\r\n PASSED-->The data written to the Randompage memory is read correctly! \n\r"); 
  }
  
  printf("\r\n I2C_EEPROM TEST Finished!!!");

  // notice this  www.armjishu.com
  I2C_DeInit(I2C1);
  I2C_Cmd(I2C1, DISABLE);
  I2C_GPIO_DeConfig();

  return EepromTestStatus;
}

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/