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// $Id: 18f4450i.lkr,v 1.1.2.2 2006/03/03 23:33:13 curtiss Exp $ // File: 18f4450i.lkr // Sample ICD2 linker script for the PIC18F4450 processor // Not intended for use with MPLAB C18. For C18 projects, // use the linker scripts provided with that product. LIBPATH . CODEPAGE CODEPAGE CODEPAGE CODEPAGE CODEPAGE CODEPAGE CODEPAGE CODEPAGE ACCESSBANK DATABANK DATABANK DATABANK DATABANK DATABANK ACCESSBANK NAME=vectors START=0x0 NAME=bootloader1 START=0x8 NAME=page START=0x200 NAME=bootloader2 START=0x3000 NAME=debug START=0x3DC0 NAME=idlocs START=0x200000 NAME=con g START=0x300000 NAME=devid START=0x3FFFFE NAME=accessram NAME=gpr0 NAME=gpr1 NAME=blpr NAME=dbgspr NAME=usb4 NAME=accesssfr START=0x0 START=0x60 START=0x100 START=0x1D0 START=0x1F4 START=0x400 START=0xF60 END=0x7 END=0x1FF END=0x2FFF END=0x3DBF END=0x3FFF END=0x200007 END=0x30000D END=0x3FFFFF END=0x5F END=0xFF END=0x1EF END=0x1F3 END=0x1FF END=0x4FF END=0xFFF PROTECTED PROTECTED PROTECTED PROTECTED PROTECTED PROTECTED PROTECTED
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The modi cations to the .lkr le include changing the vectors code page to end at 0x7 instead of 0x29 and adding the bootloader1 and bootloader2 code pages, which are off-limits to the application code, along with blpr, which is used for the registers involved with the bootloader. The code produced by the linker should avoid these areas, and if there are insuf cient resources (program memory or registers) to support the application and the bootloader, then you will receive an error during linking. The nal two requirements are really use cases: If there is no application loaded in, then the system should go into a state where it is ready to accept an application, and if there is one already, it can poll an external control that indicates whether or not there is a new application to be loaded. For a basic system, this control is simply a bit that is either high or low to indicate that the bootloader should go into application load mode.
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As I write this, there are just a few mid-range PIC microcontroller part numbers that allow a bootloader to be implemented, but these devices are quite comprehensive in terms of I/O features and can be used in a number of applications. I should point out that there are no devices that can use the USB port for passing data in you are limited to using
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0 0000 0 0004
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Bootloader Reset Application Codev
Application Code Storage
Application Reset Application Code
Bootloader Reset
Main Bootloader Execution Code
0 1FFF
Main Bootloader Execution Code Application Reset
Figure 12.1 A mid-range bootloader must be designed to have minimal impact on the application code loaded into the system.
the serial port or a synchronous protocol of some kind. Despite this limitation, adding a bootloader as part of your application is something that you always should keep in the back of your mind, and even if you don t implement it, you can keep this functionality in your hip pocket for inclusion at a later point in time. The model that I use for mid-range bootloaders is shown in Fig. 12.1, and in it I place the majority of the bootloader code at the top of program memory but also use the bottom four instructions. These four instructions mean that the bootloader will have to save the four instructions provided by the loaded application and be able to execute them from elsewhere in the application. The code with these instructions is at StartVector:
StartVector: bcf STATUS, RP0 bcf STATUS, RP1 bcf STATUS, IRP clrf PCLATH ProgramStart: dw 0x3FFF dw 0x3FFF dw 0x3FFF dw 0x3FFF goto ; ; Otherwise, Execute the existing program Make sure Bank Addresses == 0
; ; ; ; ; ;
Jump to the starting address Put the Address Address Address Address rst 4 instructions here. 0 1 2 3
0x0004 | ($ & 0x1800)
When the application is being downloaded, the rst four instructions are loaded into the four instruction locations starting at ProgramStart. When the application is executed, such as at boot up when the bootloader determines that there is an application loaded
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