barcode scanner sdk vb.net Figure 19-5 Using four displays in Software

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Figure 19-5 Using four displays
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This chapter is about creating accurate, controlled pulse sequences. Ms. Music, the local high school music teacher, did not get the funding for the metronomes she needs for her class. The enterprising local principal has asked your electronics instructor to see if he can get your class to make 25 low-cost electronic metronomes for the music students. Creating an electronic metronome is an exercise in producing discrete, accurate time intervals that are controlled from a potentiometer. On the metronomes we create, the counts/minute will be controlled by a potentiometer, they will be shown on the display, and they will be annunciated on a speaker. Although the output needed from a metronome is rather limited (40 to 208 ticks per minute is the standard), our project will be able to provide any count desired, from a count every few seconds to a few thousand counts per second, when we use appropriate values in our program. All we need to do is to change the software (and that, in a nutshell, is the power of devices that you make yourself). To implement this in a multiprocessor parallel-processing scenario, we will use four cogs:
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Cog0 blinks an LED at a fixed rate (60 cycles per minute) to indicate that the sys-
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tem is on. We use a rate of exactly one-sixtieth of a second for the LED to serve as a comparative standard for the metronome operations. When the metronome is set for 60 beats per minute, it should match the blinking of the LED exactly. Cog1 manages the LCD. Cog2 actuates the speaker coil to create a click. Cog3 reads the potentiometer and calculates the needed values. The complete program for the metronome is provided in Program 20-1. This program illustrates how easy it is to compartmentalize the four tasks that need to be undertaken by assigning them to individual cogs and how effortless it is for the cogs to share the information they need to make it all work. The wiring for a metronome is provided in Figure 20-1.
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Figure 20-1 Wiring for the metronome
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Program 20-1
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{{29 Sep 09 Harprit Sandhu Metronom1.Spin Propeller Tool Ver 1.2.6 20 Prog 1 Creating pulses An electronic metronome. Standard is 40 to 208 BPM (beats per minute) 4 Cogs are used Cog0 GO, toggles power line once a sec Cog1 LCD, displays values on LCD Cog2 Counts, toggles the speaker Cog3 Calc, calculates the beats }} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 Clickline LED2Line ledLine VAR long long long long long long = 25 = 26 = 27
'The system clock spec 'crystal rate 'Clicks speaker 'Toggles the 2nd LED 'the ON led, 1 sec cycle 'these are the variables we use. 'for lcd 'for counts 'for spkr 'for click 'for potentiometer reading 'beats per minute (continued)
Stack [40] Stack2[40] Stack3[40] Stack4[40] Pot bpm
General Discussion oF inPuT/ouTPuT
Program 20-1
Electronic Metronome (continued)
OBJ LCD : "LCDRoutines4" UTIL : "Utilities"
'These are the methods we need 'for controlling the LCD 'for general methods, read potentiometer 'This the main method in this program 'create COG for LCD 'create COG for speaker 'create COG for calculations 'Power indicator 'The main cog blinks an LED only 'These lines just blink an LED 'as an ON indicator as a one 'second reference 'line 27
PUB GO cognew (lcd_COG, @Stack) cognew (Counts_COG, @Stack2) cognew (Calc_COG, @Stack3) dira[ledLine]~~ repeat outa[ledLine]~ waitcnt(clkfreq/2+cnt) outa[ledLine]~~ waitcnt(clkfreq/2+cnt) PRI lcd_COG LCD.INITIALIZE_LCD REPEAT LCD.POSITION (1,1) LCD.PRINT(STRING("POT VAL=")) LCD.PRINT_DEC(pot) LCD.SPACE(4) LCD.POSITION (2,1) LCD.PRINT(STRING("BEATS/M=")) LCD.PRINT_DEC(bpm) LCD.SPACE(4)
'This is the display to the LCD 'set up the LCD 'Routine to write to the LCD 'Position cursor 'identify signal 'print the Pot reading 'write over old data 'Position cursor 'identify signal 'print the beats/min 'write over old data ' PRI Counts_COG 'This COG toggles the speaker dira[LED2Line]~~ '26 bpm:=60 'this initializes the value repeat 'repeat loop outa[LED2Line]~~ 'toggle second LED waitcnt(clkfreq/(bpm/30)+cnt) 'wait time Click_Speaker 'calls method for this outa[LED2Line]~ 'turn it off waitcnt(clkfreq/(bpm/30)+cnt) 'wait time PRI Calc_COG 'This COG calculates the beats pot:=10 'this initializes the value bpm:=60 'this initializes the value repeat 'repeat loop pot:=util.Read3202_0 'read the potentiometer bpm:=40+(10*pot)*(208-40)/40950 'calculate beats from pot reading PRI Click_speaker dira[Clickline]~~ outa[Clickline]~~ outa[Clickline]~ 'makes the click sound 'line 25 'turn on 'turn off
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