ChibiOS Free Embedded RTOS

When i try to read a file with FATFS on a sd card attached through SPI.
I get a weird error, starting from when i have read the first 47 bytes, then there will be 56 bytes of data, which is not in my file, and the the text from my file starts again. This happens for every 512 bytes.

The 56 bytes of data is always the same, and is (in hex)


Is this a part of the sd card protocol, which is not filtered out in the mmcSequentialRead function or ?

- 0st3n

Is it the same with a different kind of card?

I never experienced this.

Giovanni

Yea, i have 2 brand new kingston sd cards, and the error is with both of them.

And another kind?

I expect the same result from equal cards.

Giovanni

I've now tried with two different brands (Kingston and Transcend) and still the same.

Not sure about what it could be, the HAL just provides block-level access to the card, everything else is done by FatFS.

It could be an SW error, for example an overflow corrupting the block buffer. I never experienced this.

You may try to invoke the block-level functions and see if there is corruption at that level.

Giovanni