CCS bootloader

[Linuxbuilders]

Hi Everybody,
I know there is many posts about it but none seem to answer few important questions.

https://pic-c.com/forum/viewtopic.php?t=45044 THIS ONE TOO...

- We are talking about - ex_bootloader.c and related files
- I use two pics 18F4520 and 18F4620

Questions:

1. Is there anybody who could explain like to a child how to calculate those 2 entries for each MCU

[Ttelmah]

You don't calculate these entries.

You compile _your_ bootloader. Look at how large it is, and put in the end figure, the top byte under next page boundary above the size of you code.

[Linuxbuilders]

Do I need to modify the program which is to be run by the bootloader, I mean tell it where is the reset vector, where bootloader is placed, etc? Or do I just compile it as normally like if there would be no bootloader in the system?

Then I think nobody here really had a look at the datasheet at all, I place it then for easy understanding. I guess that is why the posts about this MCU are not resolved.



So could you please help here. I am a bit confused here how to operate on pages which are not listed, etc.

Rom makes not much too here:

ROM Allocation:

[Ttelmah]

Look at ex_bootload.c

The program needs to be relocated to avoid the bootloader. This shows how to perform this relocation. Note how it includes bootloader.h, but without defining the keyword "_bootloader". This tells it to perform the relocation only.

[Linuxbuilders]

So if I understand it correctly based on my compilation my

[Ttelmah]

I doubt it.

Just use the bootloader.h. If you need a different LOADER_END address, just #define this before loading bootloader.h. It does everything else. It generates loader size for you, from loader_end. It calculates the #ORG etc..

[Linuxbuilders]

As instructed, left it alone. After compilation it looks like this:

ROM Allocation:
0514 @delay_ms1
001E @delay_us1
0572 @PUTCHARI_BIU_1
053E @GETCH_BIU_1
01CE real_load_program
016C @24@FLASHWR
018C @24@WRITE_PROGRAM_MEMORY
010A atoi_b16
0100 load_program
0500 application
0040 MAIN
0008 isr
0040 @cinit

Then I have used EX_BOOTLOAD.C to check if it will work, no go, does not boot up. Ideas?
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[Linuxbuilders]

Got it working,
no change required, just compile and load, then modify the main program as per instructions.

However it is chaotic, it enters bootloader every second reset - I will have to look at my input.

Thnx
_________________
Help "d" others and then you shell receive some help from "d" others.

[Ttelmah]

I'd be looking at the pullup resistor on the input.