w25q64最小读写单位

Huicy

想问，w25q64 芯片的最小读写单位是页还是扇区，页是256字节，而扇区是4096字节，可是我看历程里面，有直接对页进行读写操作的，为什么还要弄一个扇区的读写操作呢？

这是对页进行写操作

[mw_shl_code=c,true]void SPI_Flash_Write_Page(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite) { u16 i; SPI_FLASH_Write_Enable(); //SET WEL SPI_FLASH_CS=0; //?????÷?? SPI2_ReadWriteByte(W25X_PageProgram); //·????????ü?? SPI2_ReadWriteByte((u8)((WriteAddr)>>16)); //·???24bit???· SPI2_ReadWriteByte((u8)((WriteAddr)>>8)); SPI2_ReadWriteByte((u8)WriteAddr); for(i=0;i<NumByteToWrite;i++)SPI2_ReadWriteByte(pBuffer);//???·???? SPI_FLASH_CS=1; //???????? SPI_Flash_Wait_Busy(); //?????????á?? } [/mw_shl_code]

这是对扇区进行写操作

[mw_shl_code=c,true]void SPI_Flash_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite) { u32 secpos; u16 secoff; u16 secremain; u16 i; secpos=WriteAddr/4096;//???????· 0~511 for w25x16 secoff=WriteAddr%4096;//?????????????? secremain=4096-secoff;//???????à?????ó?? if(NumByteToWrite<=secremain)secremain=NumByteToWrite;//???ó??4096??×??? while(1) { SPI_Flash_Read(SPI_FLASH_BUF,secpos*4096,4096);//?????????????????? for(i=0;i<secremain;i++)//???é???? { if(SPI_FLASH_BUF[secoff+i]!=0XFF)break;//?è?????? } if(i<secremain)//?è?????? { SPI_Flash_Erase_Sector(secpos);//???????????? for(i=0;i<secremain;i++) //???? { SPI_FLASH_BUF[i+secoff]=pBuffer; } SPI_Flash_Write_NoCheck(SPI_FLASH_BUF,secpos*4096,4096);//???????????? }else SPI_Flash_Write_NoCheck(pBuffer,WriteAddr,secremain);//??????????????,?±?????????????à????. if(NumByteToWrite==secremain)break;//?????á???? else//???????á?? { secpos++;//???????·??1 secoff=0;//??????????0 pBuffer+=secremain; //???????? WriteAddr+=secremain;//?????·???? NumByteToWrite-=secremain; //×????????? if(NumByteToWrite>4096)secremain=4096; //???????????????????ê else secremain=NumByteToWrite; //?????????????????ê?? } }; } [/mw_shl_code]

正点原子

因为擦除单位是扇区。

Huicy

回复【2楼】正点原子:
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既然例程中有对扇区操作以进行数据读写，那为什么还要多写一个对页进行读写操作啊？

正点原子

回复【3楼】Huicy:
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因为超过1页，要重新设置地址，否则在原地打滚....

正点原子

建议你仔细看W25Q的数据手册。