How to compute for the same CRC32 that the ST-LINK utility tool is calculating?

[raullette]

Posted on January 19, 2017 at 08:47

Hi,

I'm developing a customized SPI Bootloader code. I plan to use CRC32 in verifying the programmed application code. I used this link as a reference for my CRC32 calculator C-code function in the Bootloader:

https://github.com/joeferner/stm32-spi-bootloader/blob/master/src/spi-bootloader.c

 

http://www.ipgp.fr/~tuchais/earthworm/v6.3/src/data_sources/naqs2ew/crc32.c

 

But, the values that I get when I use that function isn't the same to the ones I get when I load the hex or bin file to ST-Link. ST-Link is showing different CRC32 values.

On the other hand, when I use online tools such as:

http://www.fileformat.info/tool/hash.htm

 

http://esrg.sourceforge.net/utils_win_up/md5sum/

 

I am getting the same CRC32 values with my C-code function.

Is ST-LINK using a different algorithm (but in the user manual, it says that it's using CRC32)?

Any insights is appreciated!

Thanks,

#stlink #crc32 #stm32

[Imen.D · Accepted solution]

Posted on January 23, 2017 at 12:28

Hello

Solomo.Mary_Raullett

,

Indeed, ST-LINK Utility is using a different algorithm than CRC32 (to use the algo as STVP too)

The algorithm used in ST-LINK Utility is a simple add operation byte by byte.

Moreover, y

ou are right about the CRC32 algorithm is mentioned in the User Manual as it is supported at first, and then we’ve c

hanged it to much with STVP’s algorithm.

Therefore

, t

he User Manual will be updatedin coming version to add the missed information.

Hope this helps you and thank you for your contribution.

Best Regards

Imen