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Before we can do any useful work with a microprocessor, we need a way to get information into and out of the processor. If nothing goes in and nothing comes out of the black box, its use is somewhat limited! The output has to be such that we can either read it or connect it to some other device that can respond to it. We or the device then reacts to this signal in a way that creates useful information or work. That, in its simplest form, is the application of computers to solve the problems we are interested in. The simplest output any programmable device can provide is a signal that goes on and off. The rate at which the line goes high and low and the relative timing of the high and low signals can provide useful information in any number of ways. Most of the serial communications that computers undertake between one another is based on the manipulation of such signals, as defined by the ASCII codes. All the communication within the computer itself is undertaken with on/off signals. We run motors with PWM (pulse width modulated) signals that vary the duty cycle of the signal between zero and one, and thus the speed of the motor. More properly, the power to the motor is said to be a function of the PWM signal. Therefore, learning how to manage these on/off signals is pretty much fundamental. For most purposes, it is not possible for human beings to use the information that the signal provides without some kind of secondary manipulation or amplification of the signal. The most common interface is the computer monitor. Learning the techniques for using the signals that computers provide is an important part of learning how to use computers. In this, the second part of the book, we learn the basics of how to read and generate the various signals that computers create and need to do useful work. Part III of this book is devoted to running experiments and making devices that use the techniques we developed in Part II. For our first exercise, we will write a simple program to blink an LED on and off on an even on/off cycle. The purpose of the program is not to blink an LED but rather to go through all the procedures that need to be undertaken to write a complete
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program and run it. By doing this, we become familiar with the operation of the entire system. Because we are all beginners as far as the Propeller chip goes, we also need to get familiar with what a program written in Spin looks like and we need to get familiar with what the procedures for running a Spin program are. We also need to start thinking about incorporating methods into the objects we write. In the Spin language, subroutines are called methods. Although there is really no need to call methods in the LED-blinking program we are about to examine, it uses three very simple two-line methods to perform the functions that manipulate the LED signals. A listing of the program is provided in Program 13-1.
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Program 13-1 Blinking an LED: Simple Method Calls
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{{12 Sep 09 Harprit Sandhu BlinkLED.spin Propeller Tool Ver. 1.2.6 13 Program 1 This program turns an LED ON and OFF, with a programmable set delay. It demonstrates the use of methods in an absolutely minimal way. The clock is running at 10 MHz. Define the constants we will use. There are no variables in this program. }} CON _CLKMODE=XTAL1 + PLL2X _XINFREQ = 5_000_000 inv_high inv_low waitPeriod output_pin =0 =1 =5_000_000 =27
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'The system clock spec 'the crystal frequency 'define the inverted High state 'define the inverted Low state 'about 1/2 sec switch cycle
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'High is defined as 0 and low is defined as a 1 because we are using an 'inverting buffer on the Propeller output. PUB Go dira [output_pin]~~ outa [output_pin]~~ repeat turnOff_LED wait turnOn_LED wait
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'sets pin to an output line with ~~ 'makes the pin high 'repeat forever, no number after repeat 'method call 'method call 'method call 'method call (continued)
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