SD卡连续写函数求解！

萧_Xiao

不知道为什么一调用这个函数就读读取不了！不知道是哪里错了！



u8 SD_WriteDisk(u32 sector,u8* buffer,u8 cnt)

{

u8 response;

u32 i=512;

u16 retry=200;

if(cnt==1)

{

response=SD_WriteSingleSector(sector,buffer);

if(response==0) { return 0; }

}

else

{

SD_CS_LOW;

SD_SendCmd(CMD55,0,0Xff);

SD_SendCmd(CMD23,cnt,0Xff); //发送预先清除指令

do

{

response=SD_SendCmd(CMD25,sector<<=9,0Xff);//连续读命令  

retry--;

} while((response!=0x00)&&(retry>0));

if(retry!=0)

{

SPI_ReadWriteByte(0xfc);

do{

while(i--)   //送512字节数据 send 512 bytes data

SPI_ReadWriteByte(*buffer++);

SPI_ReadWriteByte(0xff); //dummy crc

SPI_ReadWriteByte(0xff); //dummy crc

response=SPI_ReadWriteByte(0xff);

if((response&0x1F)==0x05)

{

retry=200;

do {

response =SPI_ReadWriteByte(0xff);

retry--;  

}while(!(response&0x01)&&(retry>0));

}

else

{

SD_CS_HIGH;

SPI_ReadWriteByte(0xff);

return 0;

}

buffer=buffer+512;

}while(--cnt);

SPI_ReadWriteByte(0xfd);

SD_CS_HIGH;

SPI_ReadWriteByte(0xff);

return 0;

}

}   

  SD_CS_HIGH;

return 1;

}    

正点原子

参考我们的代码吧。

萧_Xiao

回复【2楼】正点原子:
参考我们的代码吧。
---------------------------------
我就是参考着写的，，是不是应该要加的CMD12。。