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One of the most important enhancements to the PIC application code development process made by Microchip over the past few years is the inclusion of a linker and library manager for MPLAB IDE. These tools allow code to be developed much more ef ciently by multiple individuals than the traditional method of assembling or compiling a single large le. To fully take advantage of linked applications, there are a number of new concepts that you will have to be comfortable with. These concepts are not very dif cult to understand, and you should be able to apply them almost immediately. The ability to link portions of code together will provide you with the ability to develop applications more effectively for the PIC microcontroller. I have indicated that it is not very dif cult to learn how to create applications that are linked, but I would recommend that when you start learning to program the PIC microcontroller in assembly language, you do it by the traditional single- le approach. The reason I make this recommendation is that you are learning a number of new concepts, even if you are an experienced programmer, and adding additional concepts will make the process more complicated. The additional complications are not limited to development of the application code but also to using MPLAB IDE for application simulation and debugging. In these cases, you will have to have multiple source le windows active and will have to be very familiar with your code to be able to follow its execution path between different modules. When you become pro cient at creating and debugging simple applications for the PIC microcontroller, you should come back to this chapter to learn more about developing linked applications because you will be able to understand them more effectively as they relate to the PIC and PIC microcontroller applications.
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Creating a linked C application (using the OIC18 or PICC compilers) is surprisingly easy in MPLAB IDE. It is accomplished simply by right clicking on Source Files in the le application box of the MPLAB desktop and then selecting Add Files . . . and
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then selecting the les that you would like to add. The source les could be but don t have to be in the same folder as each other or, for that matter, the project hex les that make your management of source les quite a bit easier. You also can customize where the generated code is placed into the PIC microcontroller. Unfortunately, these capabilities are not so easy to implement in assembly and other languages. When I am talking about linking, I am describing the combining of object les (which have the le extension .o) and library routines (with the le extension .lib) together to create a single application. These object les are produced by compiling multiple source code les. Together, these source code les make up the entire application and may have been written by different people; they even could have been written years before or could be provided by a third party. The primary reason for providing this function is to make things more convenient for application developers (meaning that it will take only minutes to compile and build the application with the latest changes), and it protects the application code (once some code is determined to be working correctly, it is compiled, and the linked les are used from then on). When I was writing the rst two editions of this book, it was quite unusual to have more than one person developing PIC microcontroller application code. The devices had a very modest amount of program memory, and the processor architecture did not lend itself well to compiled languages with linked object les. Over the years since the last edition of this book, the PIC18 devices have become very popular because they have up to one million instruction application capabilities and an architecture for which it is easier to write traditional compilers. This has lead to products requiring teams of developers and also has required source code control to ensure that the correct versions of different functions are used in the nal application. This trend toward multiple developers is sure to continue and is being taken advantage of in low-end and mid-range devices, where compilers capable of producing object les that can be linked in to applications are becoming more available.
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