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There are sample linker scripts for all of the PIC microcontrollers available in the C:\Program Files\Microchip\MPASM Suite\LKR folder of your PC. To build a program, you will start with a sample linker le like the following (which was written for the PIC16F877A):
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// Sample linker command le for 16F877a and 876a // $Id: 16f877a.lkr,v 1.2.16.1 2005/11/30 15:15:29 curtiss Exp $
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LIBPATH CODEPAGE CODEPAGE CODEPAGE CODEPAGE CODEPAGE CODEPAGE CODEPAGE CODEPAGE DATABANK DATABANK DATABANK DATABANK DATABANK DATABANK DATABANK DATABANK
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. NAME=vectors NAME=page0 NAME=page1 NAME=page2 NAME=page3 NAME=.idlocs NAME=.con g NAME=eedata NAME=sfr0 NAME=sfr1 NAME=sfr2 NAME=sfr3 NAME=gpr0 NAME=gpr1 NAME=gpr2 NAME=gpr3 NAME=gprnobnk NAME=gprnobnk NAME=gprnobnk NAME=gprnobnk NAME=STARTUP NAME=PROG1 NAME=PROG2 NAME=PROG3 NAME=PROG4 NAME=IDLOCS NAME=DEEPROM START=0x0000 START=0x0005 START=0x0800 START=0x1000 START=0x1800 START=0x2000 START=0x2007 START=0x2100 START=0x0 START=0x80 START=0x100 START=0x180 START=0x20 START=0xA0 START=0x110 START=0x190 START=0x70 START=0xF0 START=0x170 START=0x1F0 ROM=vectors ROM=page0 ROM=page1 ROM=page2 ROM=page3 ROM=.idlocs ROM=eedata END=0x0004 END=0x07FF END=0x0FFF END=0x17FF END=0x1FFF END=0x2003 END=0x2007 END=0x21FF END=0x1F END=0x9F END=0x10F END=0x18F END=0x6F END=0xEF END=0x16F END=0x1EF END=0x7F END=0xFF END=0x17F END=0x1FF // Reset and interrupt // ROM code space // ROM code space // ROM code space // ROM code space // ID locations // Data EEPROM page0 page1 page2 page3 PROTECTED
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and then modify it according to the needs of the application. The CODEPAGE directives are used to de ne areas in program memory, with the PROTECTED areas only available for object les that have code that is to execute there speci cally. The DATABANK areas list the areas in each bank according to special purpose registers (which are PROTECTED
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because the registers are going to be accessed explicitly) or le registers. The SHAREBANK directives indicate the 16 bytes at the top of each register bank that are common across all four banks. Finally, the SECTION directive is used to specify the regions code can reside in. When MPLINK executes, it locates code and data spaces for the object les and their variable areas. The ideal situation is to have an object code that can be located anywhere in memory as it makes the work of MPLINK easier. Once the object code locations are speci ed, MPLINK works to resolve addresses between objects and ensure that all memory objects are accessible for the different object les. When this is done, MPLINK produces the executable .hex le along with the .cod and .cof les. Using MPLINK may seem like a lot of work (especially when you are rst learning the PIC microcontroller), but it will help you manage your source code, optionally with built object les or putting multiple functions together as a library. It will also take care of many housekeeping functions you may have to perform, which include making sure there aren t any named segments or blocks that aren t being accessed as well as providing your applications with a single location for memory objects.
SIMULATING APPLICATIONS
I place a high value on the MPLAB IDE simulator and its ability to help you understand how the PIC microcontroller is con gured at startup as well as how the application runs before you go through the effort of building the circuitry and programming the chip. I have found that spending a few minutes verifying that the application works on the simulator can save literally hours (or even days if you are new to the PIC microcontroller) thrashing around to nd what the problem is. While not perfect, and unable to simulate all the various peripheral devices in a PIC microcontroller, the MPLAB IDE simulator can give you over 90 percent con dence that any application will work before you apply power to the chip. This con dence translates into PIC MCU applications that will almost always start running when installed in circuit, and if the application does not work, you can then concentrate on hardware causes for the problem rather than software issues. This capability has saved me thousands of hours over the years and allowed me to nd and x problems quickly, which makes simulation a very valuable commodity for me. I am surprised at the number of new developers I meet who do not understand the value of simulation; they often write their code, build the applications, program the PIC microcontrollers, plug them into the application circuit, and then don t know where to begin when the application doesn t work. The simulator could have avoided much of these problems by allowing them to test the application code before trying out actual hardware. I ve found that, when asked to help new developers when they encounter problems, by simply asking have you simulated the application I can nd the problem in just a few moments and win a convert who will now rst simulate the application before trying it out in actual hardware. An example of the importance of using the simulator before burning an application into a PIC microcontroller can be shown in the C18 example listed at the end of this chapter. The application itself is very simple: just enable PORTB.0 as an output, delay for some period of time, and then toggle the state of PORTB.0 before looping around
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