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in an aircraft, then you should make sure that all speci cations are met for equipment operating in that environment. Many of these speci cations (especially in the aerospace arena) will seem dif cult and expensive to meet, but remember that in many cases these speci cations are a result of other, earlier products failing sometimes harming people. Lastly, make sure that you have documented your application properly. I would say that this is an aspect of project development that is part of the quali cation plan because documentation for users as well as manufacturers is critical to having your product integrated. User interfaces should be designed to make the product easy and intuitive to use (more on this later). Making sure that the extra hardware required by the user, as well as how to connect and power the application, is always required if anybody other than you is going to use the application or build it. With the availability of the open document, open source software, I would recommend that you either use Microsoft s Word or the open-source equivalent. Word les are nice because their graphics can be inserted into the les and used as directions and documentations. Other options include Adobe .pdf or HTML. Of course, if worst comes to worst, you could document your product in a straight ASCII text le. The documentation format and content should be discussed with the target audience to ensure that it is written appropriately and will be useable. Providing documentation electronically is usually preferable because it can be distributed easily and updated without having to send out multiple text copies. All these requirements can be summarized in an ISO9000 registration. ISO9000 (the generic term) is a certi cation required by the European Union that is used to document development and manufacturing processes. Even if you are a one-person company, ISO9000 certi cation can be achieved for a modest cost and will add enforced rigor to your development process.
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Once you have a requirements plan, then you must decide how the resources in the PIC microcontroller are to be used by the application. Often you will nd that the application interfaces require more resources than what the chosen PIC microcontroller can provide, or they con ict in such a way that the two resources cannot be used independently. In this case, you will have to go back and look at the application s requirements de nition to see what can be changed so that you don t use more resources than what s available in the PIC microcontroller. Resource allocation is really a part of the requirements de nition; no circuits have been designed and no code has been written, so there should not be any signi cant lost effort or time in the development process if you have to go back and change the requirements at this point. Resources in the PIC microcontroller include
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1 Program memory 2 File registers 3 I/O pins
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Looking at the list, you probably will be surprised at some of the things I consider resources. Program memory and le register usage were addressed in requirements de nition, but they are resources that have to be allocated for speci c uses. For example, to list the le register resources, you may want to list the arrays and variables with the purpose of trying to arrange them so that there is a minimum amount of space that cannot be used because of interaction of the variables and arrays. Estimating actual program memory requirements is much more dif cult, and probably the best allocation checking that can be done is to try to break out each block of code and estimate how large it will be. This isn t anywhere near 100 percent accurate, but it should alert you to any signi cant problems with not having enough space. As you work through applications, you will gain a better eye at estimating how many instructions some code is going to take up. Timer allocation can be tricky, and you may nd yourself with more timed functions than you have timers. In this case, you may have to run the timer with short common-denominator delays and processing according to the various counters required by the application. For example, to implement two routines that must be run at 50 and 60 ms, you could de ne TMR0 to reset once every 10 ms and process the two routines as
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org int: movwf movf movwf bcf movlw movwf decfsz goto movlw movwf 4 _w STATUS, w _status INTCON, T0IF ; 10msecDelay TMR0 50msCounter, f 60msCheck 5 50msCounter Reset TMR0 Interrupt Request
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