Record in Intel Hex file

[perdrix]

I've just built a hex file for a PIC17C42A project that was last built in May 2000.   I used MPLAB 8.92 Quickbuild to build the output hex file.

The May 2000 .hex file and the new one are identical apart from the fact the new file has one additional record at the beginning:

Code: [Select]

:020000040000FA
AFAICT this specifies an "Extended Linear Start Address" with a value of 0x0000 (upper 16 bits of 32 bit address) and so I can safely treat it as if it's not there.  Is that correct?

Thanks
David

[JPortici]

yes

[MIS42N]

You are correct. It is an Extended Linear Start Address. I just wrote a PIC bootloader for PIC16F1455 and had to deal with it. I found this article very useful https://www.kanda.com/blog/microcontrollers/pic-microcontrollers/pic-hex-file-format/.

[Ian.M]

If in doubt, go to the horse's mouth: Intel's Hexadecimal Object File Format Specification.
PIC specific details of how that specification is then used will be found in section 1.7.5 Hex File Formats of Microchip's
MPASM Assembler, MPLINK Object Linker & MPLIB Object Librarian User’s Guide (DS33014L).