/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* the Function Name: SD_WriteSingleBlock
* Description: write a block of SD card
* Input: u32 sector sector address (sector value, not physical address)
* u8 * buffer data memory address (at least 512 byte size)
* the Output: None
* Return: u8 r1
* 0: success
* other: failure
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
U8 SD_WriteSingleBlock (u32 sector, const u8 * data)
{
U8 r1.
Under-16 I;
Under-16 retry.
//set to high speed mode
SPI_SetSpeed (SPI_SPEED_HIGH);

//if not SDHC, given the sector address and convert it into a byte address
//if (SD_Type!=SD_TYPE_V2HC)
//{
//sector=sector<9. The boundary of the sector//512 or physical sector aligned address
//}

R1=SD_SendCommand (CMD24, sector, 0 x01);
If (r1!=0 x00)
{
Return r1.//reply is not correct, direct return
}

//start preparing data transmission
SD_CS_ENABLE ();
//put three empty data first, waiting for the SD card ready
SPI_ReadWriteByte (0 XFF);
SPI_ReadWriteByte (0 XFF);
SPI_ReadWriteByte (0 XFF);
//put the initial token 0 xfe
SPI_ReadWriteByte (0 xfe);

//send a sector data
for(i=0; i<512; I++)
{
Data++ SPI_ReadWriteByte (*);
}
//send the dummy of two Byte CRC
SPI_ReadWriteByte (0 XFF);
SPI_ReadWriteByte (0 XFF);

//wait for SD card reply
R1=SPI_ReadWriteByte (0 XFF);
If ((r1 & amp; 0 x1f)!=0 x05)
{
SD_CS_DISABLE ();
Return r1.
}

//wait for operation is completed
Retry=0;
while(! SPI_ReadWriteByte (0 XFF))//card programming, data line is pulled low
{
Retry++;
If (retry> 65534)//if long time to write not complete, an error to exit the
{
SD_CS_DISABLE ();
return 1;//write timeout return 1
}
}

//write complete, slice to choose 1
SD_CS_DISABLE ();
SPI_ReadWriteByte (0 XFF);

return 0;
}

CodePudding user response:

Use 8 GSD card, how to don't on the file system

CodePudding user response:

beginner, don't quite understand at first, and the file system