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We set the number that will be added (or subtracted if negative) to the counter during each cycle as follows:
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frqa:=1
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The counter is now set up. Next, we have to start using the counter. To make sure nothing we did not plan for will happen, we make the system dormant by setting the starting pulse width to zero:
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PulseWidth:=0
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The cycle time is set by dividing the clock frequency in CPS by the frequency. The clock frequency is 10_000_000 CPS. We want a cycle time of 10 milliseconds. This specifies a frequency of 100 cycles per second, so we use the following:
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Cycle_time:=clkfreq/100
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We need a starting point for the counter because we will be using the system counter to measure various cycle times and pulse widths. We do this by setting the starting period count because we will set the final period count by adding the current counter value to the cycle time:
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period:=cnt
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With all this in place, the code in Program 7-1 will give us a fixed pulse width of PulseWidth. The pulse width is set as a negative value because we will be adding 1 from the counter at each cycle of the clock to work it to zero.
program 7-1 Segment: PWM Routine
PRI repeat 'power PWM routine. phsa:=PulseWidth 'Send a high pulse for PulseWidth counts period:=period + Cycle_time 'Calculate cycle time waitcnt(period) 'Wait for the cycle time
Program 7-2 allows us to look at the result with an oscilloscope. We will use a fixed pulse width that is half the cycle time (50_000 cycles) so that our success will be readily verifiable on the oscilloscope.
program 7-2 Generating a Fixed PWM Signal
{{14 Sep 09 Harprit Sandhu PWM.spin Propeller Tool Ver 1.2.6 7 Program 2 This program generates a fixed PWM. Meaning that as programmed the width does not vary. (Set at 50%) It is easy to recognize }} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 VAR long pulsewidth long cycle_time long period PUB Go dira[7]~~ ctra[30..26]:=%00100 ctra[5..0]:=7
'The system clock spec 'crystal frequency
'set output line 'run PWM mode 'Set the "A pin" of this cog (continued)
Understanding One COg
program 7-2
Generating a Fixed PWM Signal (continued)
frqa:=1 'Set this counter's frqa value to 1 PulseWidth:=-5000 'Start with position=5_000 Cycle_time:=clkfreq/1000 'Set the time for the pulse width to 1 ms period:=cnt 'Store the current value of the counter repeat 'PWM routine. phsa:=PulseWidth 'Send a high pulse for PulseWidth counts period:=period + Cycle_time 'Calculate cycle time waitcnt(period) 'Wait for the cycle time
Run this program and look at pin 7 with your oscilloscope. You should see a signal with a 50% duty cycle. (Now if we can somehow vary the pulse width, we will have a PWM generator.) Accordingly, we address varying the duty cycle of the PWM signal from 0% to 100%. We will do this by reading a potentiometer and using its input to vary the pulse width as needed. We need to make some modifications to the program to do this. Because you are not yet proficient enough to do this, I will just give you the code we need in Program 7-3. In order to run this program, you need to load the program Utilities and the program LCDRoutines4 to the same file as this program to make it all work. (They actually have to be saved to disk in the same file as your program for your program to be able to find them.) We require these objects because we need to call certain methods that are resident in these objects.
program 7-3 Variable PWM Signal Based on a Potentiometer Reading
{{14 Sep 09 Harprit Sandhu PWM1.spin Propeller Tool Ver 1.2.6 7 Program 3 This program generates a variable PWM signal. Based on a potentiometer reading }} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 VAR long long long word OBJ LCD UTIL
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