 2003 Microchip Technology Inc.

DS00247A-page 15

AN247

Software License Agreement

The software supplied herewith by Microchip Technology Incorporated (the “Company”) is intended and supplied to you, the

Company’s customer, for use solely and exclusively with products manufactured by the Company.

The software is owned by the Company and/or its supplier, and is protected under applicable copyright laws. All rights are reserved.

Any use in violation of the foregoing restrictions may subject the user to criminal sanctions under applicable laws, as well as to civil

liability for the breach of the terms and conditions of this license.

THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATU-

TORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICU-

LAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR

SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.

APPENDIX B: CAN BOOTLOADER FIRMWARE

;*****************************************************************************

;*

;*

Microchip CAN Bootloader

;*

;*****************************************************************************

;* FileName:

CANIO.asm

;* Dependencies:

;* Processor:

PIC18F with CAN

;* Assembler:

MPASMWIN 03.10.04 or higher

;* Linker:

MPLINK 03.10.04 or higher

;* Company:

Microchip Technology Incorporated

;*

;* Basic Operation:

;* The following is a CAN bootloader designed for PIC18F microcontrollers

;* with built-in CAN such as the PIC18F458. The bootloader is designed to

;* be simple, small, flexible, and portable.

;*

;* The bootloader can be compiled for one of two major modes of operation:

;*

;* PG Mode: In this mode the bootloader allows bi-directional communication

;*

with the source. Thus the bootloading source can query the

;*

target and verify the data being written.

;*

;* P Mode: In this mode the bootloader allows only single direction

;*

communication, i.e. source -> target. In this mode programming

;*

verification is provided by performing self verification and

;*

checksum of all written data (except for control data).

;*

;* The bootloader is essentially a register-controlled system. The control

;* registers hold information that dictates how the bootloader functions.

;* Such information includes a generic pointer to memory, control bits to

;* assist special write and erase operations, and special command registers

;* to allow verification and release of control to the main application.

;*

;* After setting up the control registers, data can be sent to be written

;* to or a request can be sent to read from the selected memory defined by

;* the address. Depending on control settings the address may or may not

;* automatically increment to the next address.

;*

;* Commands:

;* Put commands received from source (Master --> Slave)

;* The count (DLC) can vary.

;* XXXXXXXXXXX 0 0 8 XXXXXXXX XXXXXX00 ADDRL ADDRH ADDRU RESVD CTLBT SPCMD CPDTL CPDTH

;* XXXXXXXXXXX 0 0 8 XXXXXXXX XXXXXX01 DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7

;*

;* The following response commands are only used for PG mode.

;* Get commands received from source (Master --> Slave)

;* Uses control registers to get data. Eight bytes are always assumed.

;* XXXXXXXXXXX 0 0 0 XXXXXXXX XXXXXX10 _NA__ _NA__ _NA__ _NA__ _NA__ _NA__ _NA__ _NA__

;* XXXXXXXXXXX 0 0 0 XXXXXXXX XXXXXX11 _NA__ _NA__ _NA__ _NA__ _NA__ _NA__ _NA__ _NA__