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'dividing factor for clock freq 'These are the methods we will need 'for the LCD methods 'for general methods
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OBJ LCD : "LCDRoutines4" UTIL : "Utilities"
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PUB Go dira [output_pin]~~ outa [output_pin]~~ LCD.INITIALIZE_LCD repeat PotValue:=UTIL.read3202_0 DIV:=1+PotValue/64 turnOff_LED wait turnOn_LED wait LCD.POSITION (1,1) LCD.PRINT(STRING("Pot=" )) LCD.PRINT_DEC(PotValue) LCD.SPACE(2) LCD.POSITION (2,1) LCD.PRINT(STRING("Div=" )) LCD.PRINT_DEC(div) LCD.SPACE(2) PRI turnOn_LED outa[output_pin] :=inv_high PRI turnOff_LED outa[output_pin] :=inv_low PRI wait waitCnt(clkfreq/div + cnt)
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'sets pin to an output line with ~~ 'makes the pin high 'initialize the LCD 'repeat forever, no number after repeat 'reads the potentiometer 'adding 1 keeps value from going to zero 'method call 'method call 'method call 'method call 'Go to 1st line 1st space 'dividing value 'print value 'erase over old data 'Go to 1st line 1st space 'dividing value 'print value 'erase over old data 'method to set the LED line high 'line that actually sets the LED high 'method to set the LED line low 'line that actually sets the LED low 'delay method 'delay is specified by the div
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For any number of reasons, we need to be able to create a signal at a given frequency and read the frequency of an incoming signal. This is one of the ways of sending information between all sorts of electronic devices. High-frequency signals are used as carriers for everything from radio, telephone, and TV transmissions to recording data on tape and on disk drives. Both the frequency and the amplitude of the signal can be varied. It is generally agreed that frequency modulation is more reliable and noise free than amplitude modification. For this reason, FM stations are clearer than the AM stations on your radio. However, FM does require considerably more bandwidth. Our interest in this chapter concerns the ability to create and read specific frequencies as might be needed for the project we are working on. Once we know how to deal with the frequencies themselves, we can extend our skills related to using them as might be needed by the projects in Part III of the book. In the experiment in this chapter, we will be working with audible frequencies so that we will not need any special instruments to detect the frequency. For the purpose of this experiment, just hearing a tone will suffice to indicate its presence. On the output side, we will create easy-to-recognize tones that emulate a musical progression. Because we will be creating rudimentary square waves, the sounds we create might leave something to be desired to a trained musician s ear, but they will suffice for our needs. We will be using the MCP3202 A2D converter to read a potentiometer, so you need to have this set up on your education board as was explained at the end of 16.
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It is often necessary to create a specific frequency to meet a control or other experimental requirement. We can use the generation of musical tones with square waves as an exercise for learning how to generate frequencies. We ll be generating eight standard notes, starting with the A4 at 440 cycles per second and going up from there (it may not be exactly instrument-grade 440 cps but will be an acceptable tone for our exercise). The Propeller is set to run at 10 MHz because we are using a 5 MHz crystal and a multiplier of two. We will assume that the logic engine is running at exactly 10 MHz for the purpose of this discussion and the experiment (it will be very close). Frequencies are generated by toggling a line up and down at a fixed rate. We will use equal-length high and low segments and vary the cycle time to get the note we want. With a processor running at 10 MHz, a 440 cps signal needs to toggle the line 440 2 times a second, or every 10,000,000/880 cycles of the system counter (10,000,000/880 =11,364 cycles). The frequencies for the eight notes we are interested in are as follows: Tone 1 2 3 4 5 6 7 8 A4 B4 C5 D5 E5 F5 G5 A5 Freq 440.00 493.883 523.251 587.330 659.255 698.456 783.991 880.00 Value Used 440 494 523 587 659 698 784 880
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