.net barcode scanner sdk Figure 10-1 Simple program with three method calls in Software

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Figure 10-1 Simple program with three method calls
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The Spin Language
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All programs are available for copying from the support website.
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program 10-1 Blink an LED Using Methods
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{{04 June 09 Harprit Sandhu BlinkMethods.spin Propeller Tool Ver. 1.2.6 10 Program 1 Blinking an LED This program turns an LED ON and OFF and demonstrates the use of subroutines in an absolutely minimal way. Define the constants we will use. Propeller font schematic: 100 21 LED GND }} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 pin waitPeriod high low =21 =500 =1 =0 'CON defines the constants 'The system clock spec 'external crystal 'select the pin to be used for the LED 'set the wait period 'define the High state 'define the Low state
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{{ The following PUB Go is the main part of the program. Everything else is in the 3 called methods. }} PUB Go dira [pin]~~ repeat turnOn_LED wait turnOff_LED wait PRI turnOn_LED outa[pin] :=high
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'sets pin to an output line 'specifies times to repeat. 'these 4 Methods are called 'these 4 Methods are called 'these 4 Methods are called 'these 4 Methods are called
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with the ~~ Blank=forever by name alone by name alone by name alone by name alone
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'Method to set the LED line high 'line that actually sets the LED high (continued)
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program 10-1
Blink an LED Using Methods (continued)
PRI turnOff_LED outa[pin] :=low
'Method to set the LED line low 'line that actually sets the LED low
PRI wait 'Method defines the delay waitCnt((Clkfreq/1000)*waitperiod +cnt) 'wait till counter 'reaches this value
If there is disagreement between a program in this book and the same program on the website, use the program on the website. It will have the latest changes and error corrections in it. Figure 10-2 illustrates the circuit layout for Program 10-1 on the Propeller Education kit. You must completely understand each and every line in Program 10-1 before you read another word. This simple program defines the essential structure of almost every program we will investigate in this book, and if you understand it in every detail, you are on your way to becoming a Spin programmer. In later discussions, we will not use words such as subroutine but rather will follow the nomenclature used in the Propeller Manual and use method so that we can become familiar and comfortable with it. New Spin words will be added to our vocabulary as they are needed for the programs we develop. Program 10-1 demonstrates the following concepts:
The CON block is for the constants. In the constants block, we specify what wire/
pins on the Propeller are to be used for what function. If we ever decide to attach the LCD to another pin, all we have to do is change the designation in this block.
Figure 10-2 Schematic of program with two cogs in it
The Spin Language
The VAR block is for the variables. We will not use any variables in this first pro-
gram, but in order to demonstrate the use of a VAR block, we must have at least one variable defined in the block. I have defined a dummy variable called numbr as a byte. This would mean that numbr could have contained any number from 0 to 255 if we were using it in our program. The PUB Go statement starts the program proper. The program first defines the pin we are using as being an output and then repeats the turning on and off of the LED an infinite number of times, which is defined by not providing a number after the repeat command. The three PRI blocks are methods that are private to this program and are used to define the actions of the three calls in PUB Go. They turn the LED on, create the wait pause, and turn the LED off in the sequence in which they are called. The purpose of this program is not so much to turn the LED on and off but rather to go through all the procedures we need to go through to write and execute a Spin program. Once you are comfortable with this program, you will be able to write an awful lot of programs in Spin. As we add to the techniques used with the Propeller in subsequent programs, you will acquire more and more of the skills that you need to Spin effectively. The wiring for Program 10-1 is illustrated in Figure 10-3. Turning an LED on and off is okay as a start, but we need to input and output all sorts of things into and out of the Propeller if we are to create useful interactions. A most useful addition to any microcontroller project is a small liquid crystal display (LCD). We will implement the rudimentary control of a 16 2 LCD controlled by a Hitachi 44780 controller. Later on, if you like you can extend this implementation to a full and comprehensive control of any display that uses the Hitachi controller. We, on the other hand, will convert the rudimentary LCD display program into code that can be used within all our future programs to display the results of whatever it is that we are doing with the Propeller. This is covered in detail in 14.
Figure 10-3 Wiring schematic for blinking an LED in Program 10-1
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