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When the backslash is used, the four lines are concatenated together, providing a similar form to the C compiler as the previous de ne. However, it s in a format that is much easier for you to read or understand. Note that when using the backslash character, comments to line end (using the // format) cannot be used. Instead, you must either restrict your comments to the last line of the macro or use the /* */ comment form. Reading over this section, you might be tempted to ignore using multiline de nes as macros as I ve shown here and just create functions for the code. This is possible, but it is a much less ef cient way of implementing short pieces of code, such as the example shown here. Implementing the code here as a function will require saving the parameter in a temporary area and then saving it in a destination variable when the function has completed. Depending on the PIC MCU you are working with and the size and complexity of the function you wish to implement, the overhead of saving the data, calling the function, returning from the function, and restoring the data can take more instructions and instruction cycles than what is required for the macro.
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If you have taken a look at some of the more complex macros presented in this book, you probably will be surprised to see that there are structured language statements (if, else, endif, while, and endw, as listed in Table 10.4). At rst glance, these statements are providing high level language capabilities to the PIC microcontroller assembly code. Unfortunately, they re not; these statements provide you with the
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Return true if both parameters are the same Return true if parameters are not the same Return true if the rst parameter is greater than the second Return true if the rst parameter is greater than or equal to the second Return true if the rst parameter is less than the second Return true if the rst parameter is less than or equal to the second Return true if both parameters are true
capability of conditionally including statements in your application. Conditional assembly statements are not part of the macro processor; they can be used outside macros and can be used anywhere in application code. Unlike the operation of if and while that you are used to, allowing condition execution of the application, they are actually executed when the source code is being assembled and can be used to conditionally change constant values or to add or delete sections of code. Conditional assembly statements are actually directives, and they are processed along with other directives (such as EQU, dt, and so on). For example, if an application were to be run on two different PIC microcontrollers, each with different built-in hardware, the ifdef ( execute if de ne label is found ) conditional assembly could be used in the following manner:
#de ne USARTPres : ifdef USARTPres : else : endif
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In this case, the #de ne statement creates a label in the application code that can be tested. Later in the code, when the ifdef statement is encountered, if the USARTPres label is present, the rst block of code is put into the assembler source code, and the
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second is ignored. If the USARTPres label is not de ned, then the rst block of code is ignored, and the second block is assembled as source code. For all if conditional assembly directives (including ifdef and ifndef), endif is required, and else is an optional conditional assembly directive that will include the code if the original condition was not true. You may see a null statement after an if, to have the else execute like
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