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debugging, but your ultimate application may use a PIC16F54 (which is much cheaper although it has a different PIC MCU architecture). Using a compiler capable of producing code means that new code doesn t have to be written when porting functions (or even whole applications) to various members of the PIC microcontroller family. Optimization of the produced code is an important aspect of the compiler. The compiler should be able to review the operation of the code and look for ways to implement it as ef ciently as possible. The other question you should ask in terms of optimization is: how well does the compiler do at including only the library code that is required for the program I like to have all my subroutines available in one le. Only the subroutines that are required by a particular application s calls should be included in the nal object le. This may be called optimized linking. Even simple optimization routines can improve the size and speed of the compiled code by orders of magnitude and make a high level language application approximate the performance (speed and code size) of assembly language code written by an expert. An important feature is a compiler that can be used natively with MPLAB IDE, which is to say that code can be written in MPLAB IDE and compiled with debugging capabilities directly inside the IDE to allow you to take full advantage of the tool. Some early compilers written for PIC microcontrollers did not have the capability to plug in to MPLAB IDE and the lack of capability was very noticeable. The compilers presented in this book can interface natively with the MPLAB IDE and, if you have experience with other systems, I believe that you will be able to recognize the advantages in ef cient application development and debugging that a high level language compiler working with MPLAB IDE brings to you. The last (and probably most important) piece of advice that I have about languages is don t pick one that hides the features of the microcontroller. You should have direct access to all the PIC microcontroller registers. The reason for this, as paradoxical as it seems, is simplicity. If the language controls the interface to the hardware, you must learn how to use the language controls. This means on top of understanding the PIC microcontroller, you also have to learn the language and its hardware interface. To make matters worse, chances are the built in interface was written for the general case, not by somebody that has your application in mind. For example, to print Hello World and start a new line:
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printf( Hello World\n ); // In C
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The printf routine depends on speci c hardware to function properly. If interface functions (like this one) are required for different hardware, it is important that you are able to access the required resources so that the necessary functions can be coded easily. High level code development for microcontrollers like the PIC MCU offer signi cant advantages in terms of development effort and speed, and writing the code in a high level language does prevent a lot of the typos and confusion endemic in assembler coding. Care should be taken, however, to ensure that the compiler and language chosen do not limit what type of applications you can create and instead simplify them and enhance the development process.
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When working with procedural high level languages (languages that have subroutines, such as C), there are two types of variables that can be used in applications: global and local. Global variables can be accessed anywhere in an application, whereas local variables can only be accessed within the routine they are declared in. Deciding which type of variable to use will affect the size, operation, and ef ciency of your PIC microcontroller application. Proper use will help you avoid errors in your application code and make your code easier to write and understand. You might assume that local variables can only be used in high level languages such as C, but they can be used in assembler subroutines as well. In C, global variables are de ned outside of any functions, like row and col in the example below. Local variables are de ned as being inside functions (temp) and include the parameters to the functions (i and j).
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