.net barcode scanner sdk The Spin Language in Software

Creation QR in Software The Spin Language

The Spin Language
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All the variables declared in the VAR section are in the shared memory and are available to all the cogs. Only those variables actually declared in the VAR section are available to all the cogs at all times. Variables used in objects that you call from within your program are not shared, and in most cases you may not even know what they are or how they were used in the called method.
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The OBJ statement defines an object to be called from your program. An object is equivalent to a program and may contain one or more methods. The OBJ section of the program lists the objects that will be called from the program. The objects themselves are defined somewhere else (within limits). The program can call objects or parts of them as needed. It is a good idea to define what each object does in some detail in the documentation so that we know why we are calling it and what it does. Once these items have been defined, we are ready to start writing the main body of the program. Most programs start with the PUB (public) statement followed by an arbitrary name (it is best to use either GO to indicate the start of a program or MAIN to follow the C convention). In our case, we are going to call all our beginning methods GO. Our first line of executable code will follow the GO assignment.
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A method can be specified as being public or private. Private methods are available only to the immediate object they are in. Public methods are available to other objects in the immediate vicinity (stored in the same file). In the Spin language, the specification of every object starts in the first column of text. The body of the object is indented one or more spaces, and everything that is indented under the first line of the object becomes a part of the object or method. There is no return at the end of the object, and the object is terminated by the first new block designation encountered. The next unindented line of code after the end of the current object defines the beginning of the next object. So in a way, our main subroutine extends from the declaration of GO as being a public subroutine to the beginning of the next unindented block of code. Let s get ready to write the pseudo-code instructions that will demonstrate what a Spin program looks like. Here is what we want our first program to do:
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Select and set the LED line to be an output. Declare the number of the line to which our LED is connected. Turn the LED line to High or On. Pause for a short time.
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Turn the LED to Low or Off. Pause for a short time. Repeat the last four lines. End the program.
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In order to do all this, a certain amount of housekeeping is necessary before we start. The following minimal setup is necessary for our particular program:
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We need to decide which of the 32 lines available in the Propeller system will be
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used to control the LED. We will use line 27 so we can save all the pins on one side of the Propeller, from 0 to 15, for future experiments. We need to set the selected line to be an output line. We need to decide how long the delays will be. We will use 0.5 seconds. We need to decide and specify the number of cycles to be completed. We will do it forever.
note The cnt variable in Program 10-1 is the system counter in the Propeller. See the Propeller Manual (PM).
Instead of writing an absolutely minimal four- or five-line program, we will write something a little more complicated and useful. We will still blink the LED, but we will use predefined constants and methods to get a little further along into the Spin language right away. Program 10-1 contains detailed comments on every line and additional general comments to explain what is going on in the program. We have established a standard that requires the beginning of each program to be a GO method, not unlike using MAIN in the C language. We will follow this standard for all our programs. The simple program structure is illustrated in Figure 10-1.
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