topic Re: burning data into Flash in Processor Expert Software

burning data into Flash

AndreiLuchuk — Thu, 16 Aug 2012 02:02:46 GMT

What I need is a CRC burned into flash so that I may check against it at run-time. How can I accomplish this?

So far I've been able to complete a 16-bit CRC using the on-chip CRC module, and the linker CRC, however they give me different values. I can obtain the checksum calculted by the CRC module with debug by looking at the registers. If i could place this value in flash during burning of the program, I can check against it at run-time. Either that, or get matching values between the two CRC algorythms.

I am using CodeWarrior 10.2 with PT addon to program the MC9S08PT60 on the TWR board.

Thanks!

Re: burning data into Flash

BlackNight — Thu, 16 Aug 2012 03:06:19 GMT

Hello,

I have not checked the PT60 CRC module, but: maybe this information might help:

http://mcuoneclipse.wordpress.com/2012/05/06/crc-calculation-with-mcu10/

It is about a CRC calculation utility with CodeWarrior.

Hop this helps,

Re: burning data into Flash

AndreiLuchuk — Thu, 16 Aug 2012 03:09:28 GMT

Thanks, I'll look at it in a minute, I just stumbled onto something.

After banging my head on this for a while, I created another test project, but I forgot to include the CRC bean. guess what, without the CRC_Init() auto-generated module, the checksum matched. TSR ahoy! It signifies there is a problem with the module or generated code.

check out the attached project. commenting out CRC0_Init in PE_low_level_init fixes it.

Re: burning data into Flash

ProcessorExpert — Tue, 21 Aug 2012 21:27:50 GMT

Hi,

If removing CRC component initialization fixes the problem, it seems that the CRC component is not set to match the same computation algorithm as it's done in linker. I have looked on the project and I wonder why you set the Complement read of CRC to 'yes' ? Was it on purpose?

I would start with inserting a new Init_CRC and with all default values that should actually match the after-reset state of CRC registers.

best regards
Petr Hradsky
Processor Expert Support Team

Re: burning data into Flash

p_vagnoni — Thu, 24 Jan 2013 15:12:57 GMT

Hello,

about my experience ( CRC flash in Kinetics parts ) is possible that the CRC calculated post linker is different from the CRC download program.

About the CRC module I used it with PE initialization and it works properly.

Paolo