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'The system clock spec 'Crystal freq 'output line for the speaker 'number of times to toggle line
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VAR {RAM assignment for cogs} long Stack1[50] 'this RAM will be assigned to COG1 long Stack2[50] 'this RAM will be assigned to COG2 {variables used for reading pot} word PotValue 'value of the pot reading long NoteFreq 'actual frequency of the note long NoteDelay 'delay in cycles {variables used in displaying LCD in Cog2} 'none {variables used in GetTone} Byte toneNumber OBJ LCD : "LCDRoutines4" UTIL : "Utilities" 'The Objects we will need for our calls 'for controlling the LCD 'for general methods
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DAT Tone word 440, 494, 523, 587, 659, 698, 784, 880 PUB GO 'The main method in this program 'the potentiometer is read in this cog (continued)
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Creating and reading FrequenCies
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Program 17-3 (continued)
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cognew (COG_LCD, @Stack1) 'create COG_TWO for LCD display cognew (COG_PLAY, @Stack2) 'create COG_THREE for toggling output repeat 'start repeat loop PotValue:=UTIL.Read3202_0 'get potValue from the utilities ToneNumber:=Potvalue/512 +1 'This reduces the value to 0-15 PRI COG_LCD LCD.INITIALIZE_LCD REPEAT LCD.POSITION (1,1) LCD.PRINT(STRING("PotPos =")) LCD.PRINT_DEC(ToneNumber) LCD.SPACE(2) LCD.POSITION (2,1) LCD.PRINT(STRING("FreqOut=")) LCD.PRINT_DEC(NoteFreq) LCD.SPACE(2) 'Handles display to the LCD 'set up the LCD 'repeat write to the LCD 'Go to 1st line 1st space 'Potentiometer position 'print the tune number 'erase over overflows 'Go to 2nd line 1st space 'frequency label printed 'print note cps 'erase over overflows
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PRI COG_PLAY 'output for speaker dira[Output]~~ 'output pin repeat 'outer loop repeat RepFactor 'inner loop and repeat # GetTone 'gets value for NoteFre !OUTA[output] 'toggle output line NoteDelay:=12_000_000/(NoteFreq*2) 'calculate the delay waitcnt(NoteDelay +cnt) 'wait for delay to synthesize freq waitcnt(clkfreq/2+cnt)
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PUB GetTone NoteFreq := Tone[toneNumber-1]
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We can generalize this program to generate more frequencies by replacing the routine for determining the frequency from a lookup table like we are using to make a calculation that determines the next frequency. (Each successive frequency is the 12th root of 2 above the previous one.) We can use this technology to generate whatever frequency we want, limited only by the fact that the wait count has to remain above 381. This sets a limit on how high the frequency generated can be. If higher frequencies are needed, we must use some other technique that does not use waitcnt. For now, we will not go into that. The wiring diagram for Program 17-3 is shown in Figure 17-1. The speaker module is shown in Figure 17-2.
reading FrequenCies
Figure 17-1 Wiring schematic for tone generator
Figure 17-2 Speaker module photo and wiring diagram
Reading Frequencies
There are two basic ways to read a frequency. If we are looking at a low frequency, we can measure how long one wave is and determine the frequency from that. If we
Creating and reading FrequenCies
have a high frequency, we can count the number of waves we see within a short period of time and determine the frequency from that. In either case, we are assuming that the frequency remains constant and we are assuming that we are looking at essentially square waves. The problems have to do with determining exactly what the effect of the wave shape is on our measurements. To avoid this complication, we are assuming that we are reading square waves. We will read a constant frequency that we will generate. In general, it is desirable to be able to read any input in less than about 0.01 seconds so that you do not notice a delay in the operation of the program. However, the faster the better. If the frequency is varying, the situation becomes more complicated. In most cases, the rate at which the frequency is changing is the information of interest rather than the carrier frequency itself. In these cases, the change in frequency is usually a very small percent of the carrier frequency so that we can still read the carrier frequency without much interference from the modulation. Figure 17-3 illustrates the setup for generating and reading the frequency. Figure 17-4 defines the components of the signal being addressed. Program 17-4 lists how the frequency is generated and read.
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