Kinetis MicrocontrollersのトピックmmCAU library causing processor fault

mmCAU library causing processor fault

mlu — Thu, 22 Sep 2011 05:27:21 GMT

I'm using the mmCAU library (mmcau_lib.a) for IAR and am getting a processor fault when trying to encode/decode AES packets that are not aligned. As a work around, I can make an aligned copy of my data, but the expense of making a copy trashes performance.

The version I'm using of mmcau_lib.a is dated 18-April-2011. Is there is newer version that has this issue fixed? Is the source code available to allow me to fix and maintain the library myself?

Re: mmCAU library causing processor fault

bluehacker — Wed, 12 Oct 2011 21:40:43 GMT

Any MMCAU reference using a non-0-modulo-4 byte address (addr[1:0] ≠ 00) generates an error termination. So I think you must align the data

Re: mmCAU library causing processor fault

dspNeil — Tue, 27 Mar 2012 04:02:33 GMT

How do you align to a 4-byte boundary in CW10.2? Do you also need to modify the linker file to put all of the mmcau functions on 4-byte boundaries?

Re: mmCAU library causing processor fault

dspNeil — Thu, 29 Mar 2012 22:43:25 GMT

I've partly answered my own question. For every data buffer that I'm using, I do the following, and it seems to be working.

uint_8 buffer_data[BUFFERSIZE +4];

uint_8_ptr buffer = (uint_8_ptr)(((uint_32)buffer_data + 4) & ~0x3);

Is there a better way to data align in functions, without calling out static buffers that are aligned via the lcf file?