SPI Flash 分页问题

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电梯直达

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楼主 | 2018-7-1 14:44 | 只看该作者回帖奖励

|倒序浏览 |阅读模式

spi, flash, TE, WRITE, ge

这段话的具体到哪一步功能不是很清楚。只知道是分页功能。
void SPI_FLASH_BufferWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
{
  u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0, temp = 0;

  Addr = WriteAddr % SPI_FLASH_PageSize;
  count = SPI_FLASH_PageSize - Addr;
  NumOfPage =  NumByteToWrite / SPI_FLASH_PageSize;
  NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;

  if (Addr == 0) /* WriteAddr is SPI_FLASH_PageSize aligned  */
  {
if (NumOfPage == 0) /* NumByteToWrite < SPI_FLASH_PageSize */
{
   SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);
}
else /* NumByteToWrite > SPI_FLASH_PageSize */
{
   while (NumOfPage--)
   {
      SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);
      WriteAddr +=  SPI_FLASH_PageSize;
      pBuffer += SPI_FLASH_PageSize;
   }

   SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);
}
  }
  else /* WriteAddr is not SPI_FLASH_PageSize aligned  */
  {
if (NumOfPage == 0) /* NumByteToWrite < SPI_FLASH_PageSize */
{
   if (NumOfSingle > count) /* (NumByteToWrite + WriteAddr) > SPI_FLASH_PageSize */
   {
      temp = NumOfSingle - count;

      SPI_FLASH_PageWrite(pBuffer, WriteAddr, count);
      WriteAddr +=  count;
      pBuffer += count;

      SPI_FLASH_PageWrite(pBuffer, WriteAddr, temp);
   }
   else
   {
      SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);
   }
}
else /* NumByteToWrite > SPI_FLASH_PageSize */
{
   NumByteToWrite -= count;
   NumOfPage =  NumByteToWrite / SPI_FLASH_PageSize;
   NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;

   SPI_FLASH_PageWrite(pBuffer, WriteAddr, count);
   WriteAddr +=  count;
   pBuffer += count;

   while (NumOfPage--)
   {
      SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);
      WriteAddr +=  SPI_FLASH_PageSize;
      pBuffer += SPI_FLASH_PageSize;
   }

   if (NumOfSingle != 0)
   {
      SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);
   }
}
  }
}

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