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Program 2-1 Complete Listing of the Partial Program Shown in Figure 2-4 (continued)
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inv_high inv_low waitPeriod output_pin
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=0 =1 =5_000_000 =27
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'define the inverted High state 'define the inverted Low state 'about 1/2 sec switch cycle 'line the led is on
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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
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PRI turnOn_LED 'method to set the LED line high outa[output_pin] :=inv_high 'line that actually sets the LED high PRI turnOff_LED outa[output_pin] :=inv_low PRI wait waitCnt(waitPeriod + cnt) 'method to set the LED line low 'line that actually sets the LED low 'delay method 'delay is specified by the waitPeriod
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Program 2-1 demonstrates, in the simplest of ways, the creation of three private methods that among them allow the application to turn an LED on and off and to provide a delay between the switching actions.
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The hardware SeTup
almost all our experiments and for all the experiments Parallax has created for their more advanced and formal educational programs. Although it is not strictly necessary for us to have one, this kit is the easiest way for us to obtain almost all the components needed for the work we will undertake in one convenient package. Later on you can use this kit to undertake all the exercises provided in the Parallax courseware. Everything in the kit can be used for other purposes. (If you want to get proficient in the use of the Propeller, you will want to study and run all the educational programs provided by Parallax. The related texts are free to download!) We want to start working with the system as soon as possible, and in order to do that we need a hardware/software setup that we can try our hardware and software ideas on. In this chapter, we will set up the system and get it ready for our first experiment. Our setups will be based on the Propeller Education (PE) Kit provided by Parallax whenever feasible. Of course, you do not have to use this kit, but I strongly recommend that you get it. It will simplify the learning process if we are working with the same hardware. This kit does not include the Propeller Manual that you need, but you can download a copy of the manual from the Propeller Tool s Help menu at no charge. It is included as a PDF file. If you can afford it, you should get a hardcopy version of the manual from Parallax. There is nothing like having the book in your hands, and there is nothing like an electronic copy if you need to search a text file. They complement one another. Because we need to have a standardized setup that we can both work with, we will work with the basic layout exactly as suggested for the PE Kit provided by Parallax. This will allow you to do all the experiments that Parallax provides along with almost all the beginner s experiments I have designed. All illustrations will reflect this layout, and all wiring diagrams will follow the layout suggested in the kit data. When changes are made to these layouts, they are called out in the descriptions. All the illustrations in this resource are in black and white to keep printing costs to a minimum. Identical illustrations, for most setups, in full color are provided on the support website
Note Parallax provides a Propeller Education Kit (#32305) that is suitable for
The hardware SeTup
(Encodergeek.com) and should be referred to for greater detail. It is much easier to glean information from a full-color illustration. See Figure 3-1 for a look at what the suggested PE Kit layout looks like. We will be using the 5 MHz crystal that comes with the PE Kit to control the frequency at which the Propeller operates. We will specify the oscillator speed for all our experiments with the following two instructions:
_CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 'The system clock spec multiply factor is 2. 'External oscillator frequency.(Crystal)
With these instructions, the Propeller will operate at 10 MHz. The frequency is very stable with a crystal (most crystals exhibit some drift with temperature and as they age). If we had used the internal RC network to specify the oscillator frequency, the frequency would not have been predictable with such accuracy. (See the Propeller Manual for a further discussion of system speed specification.)
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