Issues with a bootloader

[Scampy]

Hi,

I'm experimenting with the Tiny Bootloader (http://www.etc.ugal.ro/cchiculita/so...bootloader.htm). I've configured the loader for the PIC I'm using (18F4580) and after I've squirted the loader hex code to the PIC and the tiny boot loader PC application sees and identifies the chip. I can then load my HEX code via the Tinyloader PC app, which then runs fine on the PIC, but after doing so the tinyloader application can no longer find the PIC.

The website mentions

In order for the bootloader to be launched after each reset, a "goto bootloader" instruction must exist somewhere in the first 4 instructions

I'm gathering that the process of uploading my code over writes the flash memory containing the bootloader, or the "goto" part.

can anyone comment or offer advice on what I need to do to my code in order to maintain the functionality of the bootloader.

[Demon]

Posting your code would undoubtedly help people to help you.

Robert

[Scampy]

Sorry Rob,

a) the code is around 2000 lines long, and
b) I'm not ready to publish it yet.

It does write EEPROM data at 0,0 and normal data up to $80

[Tabsoft]

Malc,

Do you have the DEFINE LOADER_USED 1 directive in your program?

By the way, here is link on the subject.
http://support.melabs.com/threads/77...ght=Bootloader

[Demon]

I meant at least the first few lines until LOADER define.

[Tabsoft]

Malc,

After you use the boot loader to load your hex file and then the boot loader can no longer see the PIC, why don't you use you PIC programmer to read the PIC back to a file. You can the disassemble it and look at the the first 8 instructions. You might be able to see what is happening that way.

If you need help let me know.