STM8S105K4 SPI相關代碼

/* 初始化函數 */
void SPI_FLASH_Init(void)
{
   SPI_Init(SPI_FIRSTBIT_MSB, SPI_BAUDRATEPRESCALER_2, SPI_MODE_MASTER,\
            SPI_CLOCKPOLARITY_HIGH, SPI_CLOCKPHASE_2EDGE, \
            SPI_DATADIRECTION_2LINES_FULLDUPLEX, SPI_NSS_SOFT, 0x07);
   SPI_Cmd(ENABLE);
   GPIO_Init(SPI_CS , SPI_Pin_CS, GPIO_MODE_OUT_PP_HIGH_FAST);
   GPIO_WriteHigh(SPI_CS, SPI_Pin_CS)

}

/*

寫使能

*/

void SPI_FLASH_WriteEnable(void)
{
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();


  /* Send "Write Enable" instruction */
  SPI_FLASH_SendByte(WREN);


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

/**

發送一個字節的數據

*/

u8 SPI_FLASH_SendByte(u8 byte)
{
 while (SPI_GetFlagStatus( SPI_FLAG_TXE) == RESET);
 SPI_SendData(byte);
  while (SPI_GetFlagStatus(SPI_FLAG_RXNE) == RESET);
  return SPI_ReceiveData();  
 }

/*

等待寫數據結束

*/

void SPI_FLASH_WaitForWriteEnd(void)

{
  u8 FLASH_Status = 0;
  SPI_FLASH_CS_LOW();
  SPI_FLASH_SendByte(RDSR);
  do
  {
    /* Send a dummy byte to generate the clock needed by the FLASH
    FLASH_Status = SPI_FLASH_SendByte(Dummy_Byte);
 }
  while ((FLASH_Status & WIP_Flag) == SET); /* Write in progress */
  SPI_FLASH_CS_HIGH();
}

/*

寫一頁數據

*/

void SPI_FLASH_PageWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)

{
  SPI_FLASH_WriteEnable();
  SPI_FLASH_CS_LOW();
 SPI_FLASH_SendByte(WRITE);
  /****************************************************************/
  /* Send WriteAddr high nibble address byte to write to */
  SPI_FLASH_SendByte((WriteAddr & 0xFF0000) >> 16);
  /* Send WriteAddr medium nibble address byte to write to */
  SPI_FLASH_SendByte((WriteAddr & 0xFF00) >> 8);
  /* Send WriteAddr low nibble address byte to write to */
  SPI_FLASH_SendByte(WriteAddr & 0xFF);
 /*****************************************************************/


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

/*

寫BUFFER數據

*/

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;// 判斷是否是頁對齊
  count = SPI_FLASH_PageSize - Addr;   //一頁裏的第幾個
  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);
      }
    }
  }
}

/*

讀一個buffer數據

*/

void SPI_FLASH_BufferRead(u8* pBuffer, u32 ReadAddr, u16 NumByteToRead)
{
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  SPI_FLASH_SendByte(READ);
  /* Send ReadAddr high nibble address byte to read from */
  SPI_FLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
  /* Send ReadAddr medium nibble address byte to read from */
  SPI_FLASH_SendByte((ReadAddr& 0xFF00) >> 8);
  /* Send ReadAddr low nibble address byte to read from */
  SPI_FLASH_SendByte(ReadAddr & 0xFF);


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

  SPI_FLASH_CS_HIGH();
}