Loading firmware from PC app, wo/ changing RESET vector

[donvukovic]

I would like to bootload a file that already has the RESET vector modified in the .hex file.

Where in the C# code does it change the RESET vector ?

Can an extra button be created to select to Change/Not Change that RESET vector.

Thanks

[Dan]

Hi,donvukovic

This is exsamples.

How to bypass activation of the bootloader.

1. To provide a jumper switch pin which is not used for communication.

2. Program modifications

<tinybld12F617_8MHz_int_9600.asm>

;0000000000000000000000000 RESET 00000000000000000000000000

            org     0x0000
    pagesel IntrareBootloader
            goto    IntrareBootloader

                                    ;view with TabSize=4

;&&&&&&&&&&&&&&&&&&&&&&& START &&&&&&&&&&&&&&&&&
;---------------------- Bootloader ----------------------

            org     first_address

; nop
; nop
; nop
; nop

            org     first_address+4

IntrareBootloader:

;* add these lines to your source file **

    btfss   GPIO,0      ;check Jumper pin
    goto    first_address

;**********

                                    ;init int clock & serial port

#ifdef Direct_TX
bcf GPIO,TX
#else
bsf GPIO,TX
#endif

1. How to use.

First start,

Writing a program to remove the jumper pin.

Second and subsequent,

Program run time, You plug the jumper pin

Program rewriting, You remove the jumper pin.