CCS/MSP430F5438A: set CRC32_PRIME start-value

Hello Marco,

could you please share a bit more information on your intentions and where you have the code line from?

Are you trying to use our CRC module of the MSP430F5438A?

Best regards

Peter

Hello Peter,

I am using the linker generated CRC32, therefore I adapted the linker file like this:

....

CHECKSUM : origin = 0x5C00, length = 0x0020
FLASH : origin = 0x5C20, length = 0xA360
FLASH2 : origin = 0x10000,length = 0x35C00
....

SECTIONS
{
#ifndef __LARGE_DATA_MODEL__
    .text       : {} >> FLASH2 | FLASH , crc_table(my_crc_table, algorithm=CRC32_PRIME)     /* Code  
....
.TI.crctab : {} > CHECKSUM
....

The CRC tables you could also find here:  MSP430 assembly tools manual. The table is created in the memory, but I want to influence the algorithm that is implemented in the linker. Is that possible?

Hello Ditemar,

thanks for that  document. The crc_tbl.h looks different in my recent CCS setup. But there i a header file crc_defines.h which describes the same as in the PDF you've sent.

But I cannot find a snipped of code where to set-up this "initial value" for the linker that is marked in yellow:

What config functions or external variabled are used to set-up this value? 

Hi Marco,

I have not used in before but Appendix C and here example C2 describes in detailed steps how to set up your project.

And I would think that you can init your CRC check_crc.c file but I would assume this is only for the non linker generated check CRC right?

I will see if I can find somebody who can answer this.

Hi Dietmar, it is not about the CRC reference implementation, because this is the next step where to recalculate the CRC linker calculation through the application. 

The idea is to set-up the linker to use a different init value to e.g. 0x1234 for the CRC calculaton. 

What I found is an SFR e.g. CRCINIRES or CRCDI but that registers I can set during run time.

I was expecting the linker to:

• take a seed value from the code (const value), which is not calculated during application runtime e.g. "static uint16_t crc_seed=0x1234"
• store the CRC32 into the crc_tbl into the flash (that I can confirm)

Marco,

I checked documentation and did not find for what you're searching but I contacted the compiler guy who made the video. Let me see if he comes up with a solution. Will update this thread once I got response.

Thanks a lot!