CRC16 for program integrity

[ferlyn]

Hi,

I'm trying to perform a CRC16 on the program memory (14bit-core Flash). However, all the sample code/documents I found was CRC16 on 8bit data.

Anyone with sample code/documents/ideas for performing crc16 on 14bit data (Program memory/Flash)??

I tried to modify the int16 generate_16bit_crc(char* data, int16 length, int16 pattern) function found in the PIC drivers folder. However the result does not tally with the crc16 generated by #rom getenv("Program_memory")-1 = crc16. Anyone with sucessfully history??

Thanks in advance....

[PCM programmer]

Look at this file:

[ferlyn]

Hi,
Thanks for the advise...

ex_checksum.c is using
#rom getenv("Program_memory")-1 = CHECKSUM
I already tested the checksum method, it is working.

however, i would like to use
#rom getenv("Program_memory")-1 = crc16

[ferlyn]

Hi,

Anyone with sucessful history on using

"#rom getenv("Program_memory")-1 = crc16"

for checking program memory???

[PCM programmer]

You could have stated your problem better. I thought this was just some
invention of yours. In fact, it's in the manual. Your real question is,
"Does anyone know the algorithm that the CCS compiler uses to generate
the crc16 as described in the #ROM section of the manual ?".

Once I figured out what you wanted, I had a hunch. I used Google to
search the CCS website, exclusive of the forum, using this string: