急求原子哥帮忙谢谢

liujie14565

下面是我的理解与疑问

 

SPI_Flash_Write_NoCheck(SPI_FLASH_BUF,secpos*4096,4096);//写入整个扇区

功能为将要写入的数据写入已经擦除好的扇区0中

首先定义了

SPI_Flash_Write((u8*)TEXT_Buffer_SPI,1000,SIZE);

secpos=WriteAddr/4096;    

其中WriteAddr为1000，那secpos=0，对吧？？？

 

然后调用SPI_Flash_Write_NoCheck(SPI_FLASH_BUF,secpos*4096,4096)函数为

 

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

{                                  这里的WriteAddr就应该等于0了吧？？？

     u16 pageremain;                                                     

     pageremain=(256-WriteAddr%256); //单页剩余的字节数 每页有256个字节      

                         由上面WriteAddr=0应该可以算pageremain=0吧？？？     

     if(NumByteToWrite<=pageremain)

                                        pageremain=NumByteToWrite;//不大于256个字节

     while(1)

     {                                                           

            SPI_Flash_Write_Page(pBuffer,WriteAddr,pageremain);    //往一页中写入数据 最大为256字节    接着调用这个函数SPI_Flash_Write_Page(pBuffer,WriteAddr,pageremain)

                                                      //单页剩余的字节数 pageremain=0

            if(NumByteToWrite==pageremain)break;//写完了1页数据(256字节)

 

           else //NumByteToWrite>pageremain     //写的数据长度大于1页(256字节)

            {

                   pBuffer+=pageremain;                 //pageremain=24

                   WriteAddr+=pageremain;     

 

                   NumByteToWrite-=pageremain;                    //减去已经写入了的字节数

                   if(NumByteToWrite>256)pageremain=256; //一次可以写入256个字节

                   else pageremain=NumByteToWrite;       //不够256个字节了

            }

     }        

}

 

接着调用这个函数SPI_Flash_Write_Page(pBuffer,WriteAddr,pageremain)

                                                   此时WriteAddr=0，pageremain=0吧？

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

{                                        此时WriteAddr=0，NumByteToWrite =0吧？

                                                                            

      u16 i;           //W25X16有8192可编程页，每页256个字节

    SPI_FLASH_Write_Enable();                  //写使能

     SPI_FLASH_CS=0;                            //使能器件  

    SPIx_ReadWriteByte(W25X_PageProgram);      //发送写页命令  

    SPIx_ReadWriteByte((u8)((WriteAddr)>>16));    

    SPIx_ReadWriteByte((u8)((WriteAddr)>>8));  

    SPIx_ReadWriteByte((u8)WriteAddr);        //发送24bit地址

    for(i=0;i<NumByteToWrite;i++) //NumByteToWrite=0

                                 SPIx_ReadWriteByte(pBuffer);//循环写入自己写入的数据         刚好写入一页的数据       

     SPI_FLASH_CS=1;                            //取消片选

     SPI_Flash_Wait_Busy();                                      //等待写入结束

}

由上面分析NumByteToWrite =0吧？  那怎么执行

for(i=0;i<NumByteToWrite;i++) //NumByteToWrite=0

                                 SPIx_ReadWriteByte(pBuffer)

这条语句呢？？？？？怎么将数据写入呢？？？

正点原子

回复【楼主位】liujie14565:
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那如果写地址不是1000呢？
难道你又重新写一个函数？