burning data into Flash

[AndreiLuchuk]

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!

[p_vagnoni]

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

[BlackNight]

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,

BK

[AndreiLuchuk]

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.

[ProcessorExpert · Accepted solution]

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