Add magic number to bin file in vector table area

[JohnCC]

Hi,

      We want to hide a magic number in the bin file. I want to do it from the vector table.at the beginning of the bin file

We build our project and create a bin file by IAR. Below is a vector table area.

The place where I draw a red circle is where the Vector table reverses. How do I write a magic number here? 

Can I directly write the physical address of internal flash? (For me is 0x31000+0xB7)

Thank you.

John.

[Turbo J]

You cannot write to a code location that has the value 0x00 - remember that writing can only turn a "1" bit into a "0" bit but not vice versa.

Thus you either need to reserve a location directly after the vector table using a full erasable page, or manually set those bits to "0xFFFFFFF" in the startup code.

[JohnCC]

Hi Turbo,

    OK. I change my startup.s and put magic number in reserve byte,

Thank you.

John.