KSDK MMCAU cau_api.h

audi_mcavoy — Wed, 23 Sep 2015 16:37:12 GMT

I found cau_api.h in my KSDK 1.2.0 directory. Here's the comments at the top of the file.

* CAU Header File

* Works with library cau_lib.a and lib_mmcau*.a

* Define FREESCALE_CAU if CAU coprocessor is used --Register parameter passing is assumed

* Define FREESCALE_MMCAU if mmCAU coprocessor is used --EABI for Kinetis ARM Cortex-Mx

* 12/19/2013

So I #define FREESCALE_MMCAU (as specified in section 3.2, page 6 of "ColdFire/ColdFire+ CAU and Kinetis mmCAU Software Libary User Guide" Rev 2.3) and #include "cau_api.h" in a K64F test project (I also added the path to my compiler includes and the library to my linker). I created an unsigned char md5_state[15] variable in main(), and called cau_md5_initialize_output(md5_state).

Next, using KDS 3.0.0, I hit Build Project.

Then I sat here dumbfounded, staring at an error message telling me that I have an "#if with no expression." Of course it's the very first non-comment line in cau_api.h, which reads. . .

#if FREESCALE_MMCAU

I have to change this to #ifdef FREESCALE_MMCAU for the project to compile.

By itself, it wasn't enough to compel me to write this rant, I mean post. I was irritated that I found yet another library/example/tutorial that doesn't work. But, I understand that KDS/KSDK isn't a trivial suite of tools.

It was when I looked at the description of the next function I was interested in, cau_md5_hash(), and noticed a discrepancy in the size of the required md_state variable. cau_md5_initialize_output() calls for 120 bits (notice I used a 15 byte array earlier). cau_md5_hash() calls for 128 bits. The other two md5 functions, and Google, confirms that I should have declared a 16 byte array of storage.

THAT's when I had enough to post this message.

To whomever maintains this library, please address these issues before the next release. Hopefully it will save someone else some grief.

- Audi

Re: KSDK MMCAU cau_api.h

ivadorazinova — Thu, 24 Sep 2015 12:02:07 GMT

Hello Audi,

thank you for your feedback.

I reproduced to SW Development Team.

Best Regards,

Iva

Re: KSDK MMCAU cau_api.h

ivadorazinova — Fri, 25 Sep 2015 08:22:51 GMT

Hi Audi,

The comment in cau_api.h is wrong, cau_md5_initialize_output() needs 16 bytes. It will be fixed for SDK 2.0.

The same bug is in http://cache.freescale.com/files/32bit/doc/user_guide/CAUAPIUG.pdf

The documentation is wrong, but the AN4307SW example is correctly using 16 bytes.

Thank you,

Best Regards,

Iva

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