On Mon, Jul 30, 2001 at 08:48:25AM +1000, David Huisman wrote:
> I require a bootloader that utilizes BIT BASHED com to PC instead of using
> on-board UART. (Note: the IO MUST be bit-bashed as the UART is already being
> used by the project).
>
> The files that will be uploaded to the micro with the bootloader are written
> in C.
> The compiler is HI-TECH C. The bootloader is programmed into micro using
> MPLAB and the PICSTART PLUS programmer.
>
> Would someone advise if they have done this exact thing or comment on
> whether the code below placed in my C source and used in conjunction with
> ROMZAP would do the trick.
>
> #asm
> psect powerup, class=CODE, delta=2
> global powerup, start
> powerup:
> org 0x3
> goto start
> #endasm
>
> void main()
> {
>      /* C code to go here */
>  }

Take a look at wloader.

http://www.xs4all.nl/~wf/wouter/pic/wloader/

Bit bashed and doesn't require any change in your code. It'll automagically
move the code out of the reset vector area.

BAJ

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