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When I am about to create my own mid-range PIC microcontroller applications, I always start with the following template:
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title FileName One Line Description #de ne _version x.xx ; ; Update History: ; ; Application Description/Comments ; ; Author ; ; Hardware Notes: ; LIST R=DEC ; Device Speci cation INCLUDE p16cxx.inc ; Include Files/Registers ; Variable Register Declarations ; Macros __CONFIG _CP_OFF & _XT_OSC & _PWRTE_ON & _WDT_OFF & _BODEN_OFF org 0 Mainline: goto Mainline_Code org Int: 4 ; Interrupt Handler at Address 4
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MainLine_Code: ; Subroutines end
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This template structures my applications and makes sure that I don t forget anything that I consider critical. The file template.asm can be found in the Templates folder. Before starting any application, this le should be copied from the subdirectory into the MPLAB IDE project, and the speci cs for the application should be added to it. When you are working with low-end or PIC18 chips, you can use this template as a basis and modify it accordingly looking over it, the only change I would make to it for other PIC microcontroller processor architectures is to delete or change the interrupt handler code because the vector at address 0x004
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is speci c to the mid-range chip. I rst created this template around 1998, and it has remained very constant over the years;I first started creating assembly-language templates for IBM PC assembly-language programming, and this practice has served me well with the PIC microcontroller as well as other devices. The title and _version at the top of the le show what the application does so that I can scan the les very quickly instead of going by what the le name indicates. The title line will show up on the top of each new listing le page. The _version de ne statement then will show the code revision level and can be inserted in any text displayed by the application. There may be a Debug de ne directive after the _version de ne directive if the Debug label is going to be tested for in the application. This directive is used with conditionally assembling code to take out long delays and hardware register operations that are not available within the MPLAB IDE simulator. Before building the application for burning into a PIC microcontroller, the Debug de ne is changed so that the proper code will be used with the application. Later in this book I will discuss the Debug de nes in more detail and how they can help you with debugging your application code. Next, I put in a description of what the application does, along with its update history (with speci c changes). One thing that I do that seems to be a bit unusual is that I list the hardware operating parameters of the application. I started doing this so that I could create stimulus les easily for applications. This seems to have grown into a much more comprehensive list that provides a cross-reference between an application s hardware circuit and the PIC microcontroller software. Before declaring anything myself, I load in the required include les and specify that the default number type is to be decimal. As I will comment on elsewhere, I only use the Microchip PIC microcontroller Include Files because these have all the documented registers and bits of the data sheets, avoiding the need for me to create my own. There are two points here that you should recognize are implemented to avoid unnecessary work and possible errors. The rst is specifying that numbers default to a decimal radix to avoid having to continually convert decimal numbers to the normal hexadecimal default. The second is to only use Microchip-developed (or in the case of high level languages, the compiler provided) chip register and constant include les to avoid the possibility that I will mistype registers or constants that will leave me with mistakes that are very hard to nd later. It is interesting, but when I have worked with teachers, they tend to have their students specify registers and constants in the program and only work in hexadecimal; unfortunately, this causes a lot of problems that are very dif cult for the students (and the teachers helping them) to nd because they are in areas that are thought to be immune to errors). Another problem is that students, to avoid a few keystrokes, will give registers different labels, which adds the task of crossreferencing datasheet register names to the ones that the students have picked. I highly recommend that you save yourself some mental effort and go with the register de nitions that are prede ned by Microchip or the compiler vendor. With the device declarations completed, I then do my variable, de nes, and macro declarations. When doing this, remember to always specify prerequisites before they are used. The MPASM assembler will not be able to resolve any macro or de ne labels that
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