understanding security state

[thorstenmumm]

Hello,

i try to secur my S12ZVC but i get a problem with my programm or understanding this funktion

when i try this exampel  as global variable

const unsigned char flash_array[] @ 0xFFFE08 =     // secure the device without backdoor key
   {
    0xFF,   //0xFFF08  
    0xFF,   //0xFFF09  
    0xFF,   //0xFFF0A  RESERVED
    0xFF,   //0xFFF0B  RESERVED
    0xFF,   //0xFFF0C  FPROT
    0xFF,   //0xFFF0D  DFPROT
    0xFF,   //0xFFF0E  FOPT
    0xFC,   //0xFFF0F  FSEC - SECURED without backdoor key
   };

my code / modul dosent works! and i can not debug and get the massage it is secur

When the Chip is unsecur me code/ modul works fine.

where is my mistake? I wil only protec the chip for reading by a other one after he is programm

what have i to do?

Thanks for help

[danielmartynek]

Hi,

When the chip is in the secure state, the debugger has no access to the chip.

It can only mass erase the flash which will unlock the MCU.

Regards,

Daniel

[thorstenmumm]

Hi Daniel,

thats clear, that the debugger dosent work.

but it work not when i built the projekt and flash it to the modul. The modul dosent works !

At first a LED shold go on, but they dosent work.

When i delete the securi aray variable  its works fine

here are my problem, whats going wrong by flashing the modul?

[danielmartynek]

Hi Thorsten,

The code is correct.

Please disconnect the debugger and reset/replug the MCU after it has been loaded and secure. 

Regards,

Daniel

[thorstenmumm]

Hi Daniel,

it dosent works!

When i write this arry to the variables it dosent works with anny of my moduls.

I have a other module this code ist written with out prozessor expert and i past the code to it. This module has the same problem! It dosent start when i reset it or turn it on.

when i delete the arry its works

what can help? i will only protect the code for reading by a other one. Can i youse a other way?

What can help?

Thanks Thorsten

[danielmartynek]

Hi,

There might be a problem with the processor expert. Because if the processor expert writes to this address, you cannot rewrite the flash, it should be in erased state. Otherwise It could go to the machine exception due to a double bit ECC error. Have you tried a simple blink program without processor expert? If not, please try it and let me know.

Regards,

Daniel

[thorstenmumm · Accepted solution]

Hi Daniel,

i think it works now!  when i wrote the flash, processor expert.took a incorecct datei they was emty. it was at all projekt the same.

now the controler works after flashing and i get the massage it is secur when i will read

i think tha ist now ok

and i am raedy for the next problem... i'm sure it cames :smileywink:

Thanks Thirsten