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Once the program has been entered on the computer, and everything is hooked up, we can run the program by pressing the f10 key on the PC keyboard. The program will be transferred to the main RAM of the Propeller and executed. If things are right, the LED on line 27 blinks on a one-second cycle. If the crystal and its specification at the top of the program do not match, the program will not run properly. If things are close, touching the crystal might add enough capacitance to the system to make things work. If the blinking does not start spontaneously, and reliably, things are not right. Before we go any further, we must get this right. Look over the hardware and the software to see what is not right and then fix it. Keep this program handy for checking the operation of the system whenever you create a new setup and want to make sure it has the potential to work.
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The Typical Spin Program
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A typical Spin program is divided into six main sections or blocks that define the following components in the program:
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CON Constants are those values that never change in the program. VAR Variables change their values in the program over time. OBJ Calls to other objects (programs) that have methods we are interested in
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incorporating into our application. PUB Public routines or methods that can be called from external objects. PRI Private routines or methods that can only be called from within the parent object. DAT Data used in the program. (This is also used in Propeller Assembly programming, but we will not cover that aspect of DAT use in this book.) Each section can have any number of lines of code in it, and each line can be commented as extensively as you like. Two types of multiline comments are supported. Those enclosed in single brackets and those enclosed in double brackets as shown here:
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{{Comment type 1}} {Comment type 2}
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You can also comment each line with a single quote marker.
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the typiCal Spin program
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The Propeller Tool environment lets you list the program under consideration in four formats. The four choices appear on the top menu line of the program listing:
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Full Source mode lists everything that was typed in as a part of the program. All the
code is listed along with all the comments. Condensed mode lists everything except the comments that are in double brackets: {{ }}. For us, this means that we should put all the verbose documentation in double brackets. This would include all the general comments as well as detailed descriptions of how the code works. Credits and general licensing comments should be included within double brackets. Summary mode lists the method headings under each of the main sections. Documentation mode lists general information in the double brackets and variable space used by the program. Information like how many variables are used by the program and how long the program is. As your familiarity with the program structures increases, you will settle on your own rules for documenting your programs. In the interim, the following rules will suffice. At the top of the program, use the double brackets to extensively document what the program does in some detail along with author information and relevant dates and revisions. Document each line of code with the ( ) marker comments so that each line is easier to understand. Explain what each line of code is doing. Where necessary, provide verbose documentation for difficult-to-understand lines. Look at all four formats occasionally as your program evolves to see what is being listed under each format and adjust your commenting to make the best use of the formatting features. All the programs I provide will follow these guidelines with double bracketed comments being added to explain the use of particularly difficult-to-understand code segments.
I like to do my programming in Full Source mode most of the time and Condensed mode some of the time. The effect of using the preceding rules is reflected in how Program 4-1 is laid out. Subsequent programs will follow these rules. The Propeller Tool allows you to have any number of programs opened at the same time. You can cut and paste freely between the programs as you develop the code for your current program. This can save you a lot of time and allows you to reuse lines of code that you know work in the way they are intended to. The names of all the open programs are listed on the top menu line of the Propeller Tool screen. A detailed description of the Propeller Tool (PT) environment and its effective use is provided under the Help section. The PT software provides a whole host of powerful tools you need to study and become comfortable with. An extensive section consisting of a detailed tutorial on using PT is also provided in the Help section. It covers the special features of the software that aid in more rapid development of software. The Propeller Manual contains detailed descriptions of all the commands in the Spin language and of the Assembly language commands. We will not go over the command descriptions in this book but will cover the use of the more commonly used commands so that you will be comfortable with their use.
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