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The source is the MS-DOS (maximum eight character) application code source le name with the .bas extension. Options are compiler execution options and are listed in Table E.6.
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TABLE E.6 OPTION
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PICBASIC COMMAND LINE OPTIONS FUNCTION
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Display the help screen; the help screen is also displayed if no options or source le name is speci ed. Use the MPASM assembler and not the PICBASIC assembler. Insert comments into PICBASIC compiler produced assembler source le; using this option is recommended if you are going to produce MPASM assembler source from PICBASIC. Specify a new directory path to use for include les in PICBASIC. Specify a different library to use when compiling; device-speci c libraries are provided by PICBASIC when the processor is speci ed. Generate a listing, symbol table, and map les. Generate a listing le. Specify the PICmicro that the source is to be compiled into; if this parameter is not speci ed, then a PIC16F84 is used as the processor; PICmicro is in the format: 16F84, where the PIC at the start of the Microchip part number is not speci ed. Do not assemble the compiled code. Turn on verbose mode, which provides additional information when the application is compiled.
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APPENDIX E
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TABLE E.7 PICBASIC DEFAULT CONFIGURATION FUSE REGISTER SETTINGS FEATURE PICBASIC SETTING
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Code protect Oscillator WDT PWRTE
Off XT or internal RC if PIC12 On Off
I have not included a list of the different PIC microcontrollers that can have their application developed by PICBASIC simply because this list changes along with the different parts that are available from Microchip. MeLabs works very hard at making sure that all new PIC MCU part numbers are supported as quickly as possible after they are announced. Information on what part numbers the latest version of PICBASIC supports can be found at meLabs web site. PICBASIC does assume a constant set of con guration values. For most PIC microcontrollers, the con guration fuses are set as listed in Table E.7. When you program the PIC microicrocontroller, you should make sure that you are comfortable with the oscillator and PWRTE value. The watchdog timer should be left enabled because the NAP and SLEEP instructions use it. Along with using the MS-DOS command line, PICBASIC can be used with MPLAB. This is the preferred way of working with PICBASIC because it works seamlessly with the Microchip tools. In the text of this book I have included some examples of how to use PICBASIC PRO for the application s source code to demonstrate how PICBASIC works with MPLAB. To use PICBASIC with MPLAB, after installing PICBASIC, select Install Language Tool under MPLAB s Project pull-down, and select microEngineering Labs, Inc. for the Language Suite, followed by the PICBASIC that you are using. After PICBASIC or PICBASIC PRO has been selected, click on Browse to nd PBC.exe or PBPW.exe. Finally, make sure that the Command Line radio button is selected, and click on OK. After doing this, you will be able to create PICBASIC projects as if they were assembler projects. Note that with PICBASIC, the project and source les must reside in the same subdirectory as the PICBASIC compiler and its associated les. This breaks up the recommended strategy of keeping all the project les in a directory that is different from the tool directory. When you develop PICBASIC applications, I recommend that you copy them into a separate subdirectory when you are nished and delete them from the PICBASIC execution directory. This avoids ending up with large, confusing PICBASIC subdirectories and no idea what is in them. The starting point of the language is the label. Labels are used for specifying execution addresses, variables, and hardware registers, as well as constant strings. As with
BASIC PROGRAMMING LANGUAGE
most other languages, PICBASIC labels are case-sensitive and can include the characters A to Z and 0 to 9 as well as _. A numeric cannot be used as the rst character of the label. Labels in the application code are used to provide jump-to and call addresses. They are indicated by writing them into the application code starting at the leftmost column of the source le and terminating with a colon (:). To access the label, the label name is used in a goto, call, or branch statement. For example, to implement an endless loop, you would use the label declaration and the goto statement:
Loop: : goto Loop Return here after running through the Code Code to Execute inside the loop Jump back to Loop and Start Executing again
Absolute addresses are not available within PICBASIC; the labels always should be de ned and referenced. The interrupt vector in the mid-range and PIC18 PIC microcontrollers is discussed below. In the preceding example I have placed a number of comments after the single quote ( ) character. The compiler will ignore everything to the right of the single quote character, just as it does for the comment character (;) in assembly-language programming. Variables in PICBASIC can be de ned in one of two ways. Each way re ects a method that was used by the two different BASIC Stamps. In the BS1, variables are prede ned in the system and broken up into either 16-bit words (which are given the identi ers w0, w1, w2, etc.), 8-bit bytes (with the identi ers b0, b1, etc.), and bits (with the identi ers Bit# or just the bit number). The maximum number of variables in the BS1 system is de ned by the processor used (in the BS1, which is based on the PIC16C54, only 14 bytes are available as variable memory). Each byte takes place in one of the words; for example, b4 is the least signi cant byte of w2. The 16-bit variables are de ned as being a part of the 16 bits taken up by w0 (b0 and b1). This method works well, but care has to be taken to make sure that the overlapping variables are kept track of and not used incorrectly. The most common problem for new BASIC Stamp developers is de ning a variable on b0 and w0 and having problems when a write to one variable overwrites the other. To provide these variables to the PICBASIC application, the BASIC Stamp variable declaration les are de ned in the two include les that are shown within include statements below. Only one of these statements can be used in an application.
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