C++ sFLASH_CS_LOW函数代码示例

/**
* @brief	Enables the write access to the FLASH.
* @param	None
* @retval None
*/
void sFLASH_SoftReset(void)
{
	/*!< Select the FLASH: Chip Select low */
	sFLASH_CS_LOW();

	/*!< Send "Write Enable" instruction */
	sFLASH_SendByte(sFLASH_CMD_RST0);

	/*!< Deselect the FLASH: Chip Select high */
	sFLASH_CS_HIGH();

	//delay	
	//sFLASH_SendByte(sFLASH_DUMMY_BYTE);


	/*!< Select the FLASH: Chip Select low */
	sFLASH_CS_LOW();

	/*!< Send "Write Enable" instruction */
	sFLASH_SendByte(sFLASH_CMD_RST1);

	/*!< Deselect the FLASH: Chip Select high */
	sFLASH_CS_HIGH();

	sFLASH_WaitForWriteEnd(0);
}

/**
* @brief	Enables the write access to the FLASH.
* @param	None
* @retval None
*/
void sFLASH_WriteStatusForWrite(void)
{  
#if 1
        /*!< Enable the write access to the FLASH */
        sFLASH_WriteEnable(0);

        /*!< Select the FLASH: Chip Select low */
        sFLASH_CS_LOW();

        /*!< Send "Write Enable" instruction */
        sFLASH_SendByte(sFLASH_CMD_WRSR);
        /*!< Send "Write Enable" instruction */
        sFLASH_SendByte(0x00);
        sFLASH_SendByte(0x02);

        /*!< Deselect the FLASH: Chip Select high */
        sFLASH_CS_HIGH();

        sFLASH_WaitForWriteEnd(0);

#endif	
	/*!< Select the FLASH: Chip Select low */
	sFLASH_CS_LOW();
	/*!< Send "Write Enable" instruction */
	sFLASH_SendByte(sFLASH_CMD_RDCR);
	/*!< Send "Write Enable" instruction */
	sFLASH_SendByte(sFLASH_DUMMY_BYTE);
	/*!< Deselect the FLASH: Chip Select hig */
	sFLASH_CS_HIGH();
}

/**
  * @brief  Writes more than one byte to the FLASH with a single WRITE cycle 
  *         (Page WRITE sequence).
  * @note   The number of byte can't exceed the FLASH page size.
  * @param  pBuffer: pointer to the buffer  containing the data to be written
  *         to the FLASH.
  * @param  WriteAddr: FLASH's internal address to write to.
  * @param  NumByteToWrite: number of bytes to write to the FLASH, must be equal
  *         or less than "sFLASH_PAGESIZE" value.
  * @retval None
  */
void sFLASH_WritePage(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
{
  /*!< Enable the write access to the FLASH */
  sFLASH_WriteEnable();

  /*!< Select the FLASH: Chip Select low */
  sFLASH_CS_LOW();
  /*!< Send "Write to Memory " instruction */
  sFLASH_SendByte(sFLASH_CMD_WRITE);
  /*!< Send WriteAddr high nibble address byte to write to */
  sFLASH_SendByte((WriteAddr & 0xFF0000) >> 16);
  /*!< Send WriteAddr medium nibble address byte to write to */
  sFLASH_SendByte((WriteAddr & 0xFF00) >> 8);
  /*!< Send WriteAddr low nibble address byte to write to */
  sFLASH_SendByte(WriteAddr & 0xFF);

  /*!< while there is data to be written on the FLASH */
  while (NumByteToWrite--)
  {
    /*!< Send the current byte */
    sFLASH_SendByte(*pBuffer);
    /*!< Point on the next byte to be written */
    pBuffer++;
  }

  /*!< Deselect the FLASH: Chip Select high */
  sFLASH_CS_HIGH();

  /*!< Wait the end of Flash writing */
  sFLASH_WaitForWriteEnd();
}

/**
  * @brief  Polls the status of the Write In Progress (WIP) flag in the FLASH's
  *         status register and loop until write opertaion has completed.
  * @param  None
  * @retval None
  */
void sFLASH_WaitForWriteEnd(uint32_t Addr)
{
  uint8_t flashstatus = 0;

  if(Addr >= sFLASH_MEMORYSIZE)  
	  {
		  /*!< Select the FLASH: Chip Select low */
		  sFLASH_CS2_LOW();
	  }
	  else
	  {
		  /*!< Select the FLASH: Chip Select low */
		  sFLASH_CS_LOW();
	  }  

 
  /*!< Send "Read Status Register" instruction */
  sFLASH_SendByte(sFLASH_CMD_RDSR);

  /*!< Loop as long as the memory is busy with a write cycle */
  do
  {
    /*!< Send a dummy byte to generate the clock needed by the FLASH
    and put the value of the status register in FLASH_Status variable */
    flashstatus = sFLASH_SendByte(sFLASH_DUMMY_BYTE);

  }
  while ((flashstatus & sFLASH_WIP_FLAG) == SET); /* Write in progress */

  /*!< Deselect the FLASH: Chip Select high */
  sFLASH_CS_HIGH();

}

/**
  * @brief  Reads a block of data from the FLASH.
  * @param  pBuffer: pointer to the buffer that receives the data read from the FLASH.
  * @param  ReadAddr: FLASH's internal address to read from.
  * @param  NumByteToRead: number of bytes to read from the FLASH.
  * @retval None
  */
void sFLASH_ReadBuffer(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
{
  /*!< Select the FLASH: Chip Select low */
  sFLASH_CS_LOW();

  /*!< Send "Read from Memory " instruction */
  sFLASH_SendByte(sFLASH_CMD_READ);

  /*!< Send ReadAddr high nibble address byte to read from */
  sFLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
  /*!< Send ReadAddr medium nibble address byte to read from */
  sFLASH_SendByte((ReadAddr& 0xFF00) >> 8);
  /*!< Send ReadAddr low nibble address byte to read from */
  sFLASH_SendByte(ReadAddr & 0xFF);

  while (NumByteToRead--) /*!< while there is data to be read */
  {
    /*!< Read a byte from the FLASH */
    *pBuffer = sFLASH_SendByte(sFLASH_DUMMY_BYTE);
    /*!< Point to the next location where the byte read will be saved */
    pBuffer++;
  }

  /*!< Deselect the FLASH: Chip Select high */
  sFLASH_CS_HIGH();
}

/**
  * @brief  Reads FLASH identification.
  * @param  None
  * @retval FLASH identification
  */
uint32_t sFLASH_ReadID(void)
{
  uint32_t Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;

  /*!< Select the FLASH: Chip Select low */
  sFLASH_CS_LOW();

  /*!< Send "RDID " instruction */
  sFLASH_SendByte(0x9F);

  /*!< Read a byte from the FLASH */
  Temp0 = sFLASH_SendByte(sFLASH_DUMMY_BYTE);

  /*!< Read a byte from the FLASH */
  Temp1 = sFLASH_SendByte(sFLASH_DUMMY_BYTE);

  /*!< Read a byte from the FLASH */
  Temp2 = sFLASH_SendByte(sFLASH_DUMMY_BYTE);

  /*!< Deselect the FLASH: Chip Select high */
  sFLASH_CS_HIGH();

  Temp = (Temp0 << 16) | (Temp1 << 8) | Temp2;

  return Temp;
}

/**
 * @brief  Reads a block of data from the FLASH.
 * @param  pBuffer: pointer to the buffer that receives the data read from the FLASH.
 * @param  ReadAddr: FLASH's internal address to read from.
 * @param  NumByteToRead: number of bytes to read from the FLASH.
 * @retval None
 */
void sFLASH_ReadBuffer(uint8_t* pBuffer, uint32_t ReadAddr, uint32_t NumByteToRead)
{
    /* Select the FLASH: Chip Select low */
    sFLASH_CS_LOW();

    /* Send "Read from Memory " instruction */
    sFLASH_SendByte(sFLASH_CMD_READ);

    /* Send ReadAddr high nibble address byte to read from */
    sFLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
    /* Send ReadAddr medium nibble address byte to read from */
    sFLASH_SendByte((ReadAddr& 0xFF00) >> 8);
    /* Send ReadAddr low nibble address byte to read from */
    sFLASH_SendByte(ReadAddr & 0xFF);

    while (NumByteToRead) /* while there is data to be read */
    {
        /* Read a byte from the FLASH and point to the next location */
        *pBuffer++ = sFLASH_SendByte(sFLASH_DUMMY_BYTE);
        /* Decrement NumByteToRead */
        NumByteToRead--;
    }

    /* Deselect the FLASH: Chip Select high */
    sFLASH_CS_HIGH();
}

unsigned int sFLASH_ReadStatus(void)
{
	unsigned int Temp0 = 0;
	
	/*!< Select the FLASH: Chip Select low */
	sFLASH_CS_LOW();
	
	/*!< Send "RDID " instruction */
	sFLASH_SendByte(sFLASH_CMD_RDSR);
	
	/*!< Read a byte from the FLASH */
	Temp0 = sFLASH_SendByte(sFLASH_DUMMY_BYTE);
	
	/*!< Read a byte from the FLASH */
	//Temp1 = sFLASH_SendByte(sFLASH_DUMMY_BYTE);
	
	/*!< Read a byte from the FLASH */
	//Temp2 = sFLASH_SendByte(sFLASH_DUMMY_BYTE);
	
	/*!< Deselect the FLASH: Chip Select high */
	sFLASH_CS_HIGH();
	
	//Temp = Temp0;
	
	return Temp0;
}

/**
  * @brief  Enables the write access to the FLASH.
  * @param  None
  * @retval None
  */
void sFLASH_WriteEnable(void)
{
  /*!< Select the FLASH: Chip Select low */
  sFLASH_CS_LOW();

  /*!< Send "Write Enable" instruction */
  sFLASH_SendByte(sFLASH_CMD_WREN);

  /*!< Deselect the FLASH: Chip Select high */
  sFLASH_CS_HIGH();
}

/**
 * @brief  Disables the write access to the FLASH.
 * @param  None
 * @retval None
 */
static void sFLASH_WriteDisable(void)
{
    /* Select the FLASH: Chip Select low */
    sFLASH_CS_LOW();

    /* Send "Write Disable" instruction */
    sFLASH_SendByte(sFLASH_CMD_WRDI);

    /* Deselect the FLASH: Chip Select high */
    sFLASH_CS_HIGH();
}

void sFLASH_GlobalUnprotect(void)
{
	sFLASH_WriteEnable();
	
	sFLASH_CS_LOW();
	
	sFLASH_SendByte(sFLASH_CMD_WRSR);
	
	sFLASH_SendByte(0);

	/*!< Deselect the FLASH: Chip Select high */
	sFLASH_CS_HIGH();
	
}	

/**
 * @brief Initializes SPI Flash
 * @param void
 * @return void
 */
void sFLASH_Init(void)
{
    /* Initializes the peripherals used by the SPI FLASH driver */
    sFLASH_SPI_Init();

    /* Disable the write access to the FLASH */
    sFLASH_WriteDisable();

    /* Select the FLASH: Chip Select low */
    sFLASH_CS_LOW();
    /* Send "Write Enable Status" instruction */
    sFLASH_SendByte(sFLASH_CMD_EWSR);
    /* Deselect the FLASH: Chip Select high */
    sFLASH_CS_HIGH();

    /* Select the FLASH: Chip Select low */
    sFLASH_CS_LOW();
    /* Send "Write Status Register" instruction */
    sFLASH_SendByte(sFLASH_CMD_WRSR);
    sFLASH_SendByte(0);
    /* Deselect the FLASH: Chip Select high */
    sFLASH_CS_HIGH();
}

/**
  * @brief  Enables the write access to the FLASH.
  * @param  None
  * @retval None
  */
void sFLASH_WriteEnable(uint32_t WriteAddr)
{
	if(WriteAddr >= sFLASH_MEMORYSIZE)
		/*!< Select the FLASH: Chip Select low */
		sFLASH_CS2_LOW();
	else
		/*!< Select the FLASH: Chip Select low */
		sFLASH_CS_LOW();

  /*!< Send "Write Enable" instruction */
  sFLASH_SendByte(sFLASH_CMD_WREN);

  /*!< Deselect the FLASH: Chip Select high */
  sFLASH_CS_HIGH();
}

/**
  * @brief  Initiates a read data byte (READ) sequence from the Flash.
  *   This is done by driving the /CS line low to select the device, then the READ
  *   instruction is transmitted followed by 3 bytes address. This function exit
  *   and keep the /CS line low, so the Flash still being selected. With this
  *   technique the whole content of the Flash is read with a single READ instruction.
  * @param  ReadAddr: FLASH's internal address to read from.
  * @retval None
  */
void sFLASH_StartReadSequence(uint32_t ReadAddr)
{
  /*!< Select the FLASH: Chip Select low */
  sFLASH_CS_LOW();

  /*!< Send "Read from Memory " instruction */
  sFLASH_SendByte(sFLASH_CMD_READ);

  /*!< Send the 24-bit address of the address to read from -------------------*/
  /*!< Send ReadAddr high nibble address byte */
  sFLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
  /*!< Send ReadAddr medium nibble address byte */
  sFLASH_SendByte((ReadAddr& 0xFF00) >> 8);
  /*!< Send ReadAddr low nibble address byte */
  sFLASH_SendByte(ReadAddr & 0xFF);
}

/**
 * @brief  Erases the entire FLASH.
 * @param  None
 * @retval None
 */
void sFLASH_EraseBulk(void)
{
    /* Enable the write access to the FLASH */
    sFLASH_WriteEnable();

    /* Bulk Erase */
    /* Select the FLASH: Chip Select low */
    sFLASH_CS_LOW();
    /* Send Bulk Erase instruction  */
    sFLASH_SendByte(sFLASH_CMD_BE);
    /* Deselect the FLASH: Chip Select high */
    sFLASH_CS_HIGH();

    /* Wait till the end of Flash writing */
    sFLASH_WaitForWriteEnd();
}