sd.c about raspi3-tutorial HOT 3 CLOSED

Hi,

The block size is 512 bytes, so the readblock function returns multiples of 512 bytes.
That readblock should be easy to intergrate with your fat driver. It works like this: you give the starting lba of the sector to read, a buffer in memory to read to, and finally the number of blocks (sectors) to read. When it returns count512, then all of the sector contents are read into the buffer. Just a sidenote, it should return 0 on error or count512 on success. The only case when it returns a non-zero, but less value is when you read from the end of the medium.
The reason it expects sector address and count but returns bytes is simple: when you calculate addresses for fat, you usually got the input in sectors. And it returns bytes because you most likely want to adjust the buffer address with that.

Cheers,
bzt

from raspi3-tutorial.

Hi,

So how should I calculate the lba from the sector number? I just read that the lba is the same as the sector is this correct?

Thanks,
Oliver

from raspi3-tutorial.

Hi,

Yes, lba is the sector number.

Cheers,
bzt

from raspi3-tutorial.