Changing the start address of the IntelHex file using Python

Question

I want to change the start address of the IntelHex file and also update the checksum. I am new to intelhex format and so I went through the documentation. I saw a attribute called start_addr and used it. But after that. it is not reflecting in the first line of the intelhex file.

PS: Pardon my writing style its my first time on stackoverflow.

My code -:

from intelhex import IntelHex
hx = IntelHex()
hx.fromfile('copy.hex', format='hex')2
hx.start_addr = {'EIP': 2149580800}

The first line of the intelhex file is -:

:0200000480007A

After running the code, the first line remains unchanged. Please help.

Answer 1

You are never actually saving your changes to any file:

hx.tofile('copy.hex', format='hex')