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deteRmining the Pulse Width
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Program 18-1 Reading One Axis of the Memsic Gravity Sensor: Generating Output to Match at 5 the Read Frequency (continued)
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repeat while ina[xaxis]==0 'wait for line 1 to go low. endPulse:=CNT 'read the timer count for second time repeat while ina[xaxis]==1 endWave:=cnt PulseLen:=endPulse-startWave waveLen:=endWave-startWave frequency:=10_000_000/waveLen waitcnt(clkfreq/25+cnt) PRI COG_LCD LCD.INITIALIZE_LCD repeat LCD.POSITION (1,1) LCD.PRINT(String("PL=")) ' LCD.PRINT_DEC((startWave)) ' LCD.SPACE(2) LCD.PRINT_DEC((pulselen)) LCD.SPACE(2) LCD.POSITION (2,1) LCD.PRINT(String("WL=")) LCD.PRINT_DEC((wavelen)) LCD.SPACE(2) LCD.POSITION (2,11) LCD.PRINT(String("FR=")) LCD.PRINT_DEC((frequency)) LCD.SPACE(4) 'wait for line 1 to go low.
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'figure the pulse 'figure the wave Len 'figure the freq
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'This is running in the new cog 'set up the LCD u 'Print to LCD routine 'Position LCD cursor 'Pulse 'print value 'write over old data 'print data 'write over old data 'Position LCD cursor 'Cycle time 'print value 'write over old data 'Position LCD cursor 'Frequency 'print value 'write over old data
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PRI COG_OUT 'output signal generation. dira[output]~~ 'Set pin direction as output repeat 'loop outa[output]~~ 'make line high waitcnt(pulselen/10+cnt) 'Create hi part of wave outa[output]~ 'Make line low waitcnt(100_000-pulselen+cnt)'Create rest of wave
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If we wanted to know the frequency of the signal we were reading, we would measure both the high and low parts of the signal and add them together to get the cycle time for one wave cycle. It is interesting to see how much the signal pulse width varies as the sensor is tilted in the read direction. Run the experiment and note your results. In Program 18-1, we read one axis of the Memsic. Later on in Part III of the book, we expand on this program to read both axes as a part of a more sophisticated program that we will write for our auto-leveling experiment.
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Reading and CReating Pulses
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Now that we have determined what the incoming pulse looks like we are ready to create a similar pulse on an output line. We will create the pulse on line P27 at five times the frequency of the incoming pulse so that the two pulses are easily differentiated. Two items need to be specified to define a pulse width: the frequency of the signal and the width/range of the pulse width within the signal. If the range is not specified, we can assume it goes from 0% to 100% of the cycle time. Let s create a square waveform at 500 Hz (the incoming pulse was at 100 Hz) in which we match the pulse width (%) of the incoming signal. This frequency is five times the frequency we read at the Memsic sensor so that we can readily see the difference between the two signals. Figure 18-4 shows what we are trying to accomplish.
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note Both signals can be displayed on a oscilloscope at the same time.
At 100 Hz and a frequency clock of 10,000,000 Hz, each cycle time is 100,000 cycles long. Within this wave we have to vary the pulse width so that it follows what we are reading from the Memsic sensor. We want to make it as close as we can, and we should be able to make it pretty close. We are speeding things up by 5 . Therefore, the new pulse length will be 1/5th of whatever we are reading. The code shown in Program 18-2 will run in an independent cog.
Program 18-2 Code Segment to Generate 5 Output
PRI COG_OUT dira[output]~~ repeat outa[output]~~ waitcnt(pulselen/5+cnt) outa[output]~ waitcnt(200_000-pulselen+cnt)
'output signal generation. 'Set pin direction as output 'loop 'make line high 'Create hi part of wave 'Make line low 'Create rest of wave
Figure 18-4 Waveforms of read and created pulse widths
Pulse Width CReation
This code is incorporated at the bottom of Program 18-1 to complete the generation of the outgoing signal. A complete relisting of the entire program with a potentiometer variable added to create the initial frequency is given in Program 18-3.
Program 18-3 Code for Original and 5 Output
{{05 Oct 09 Harprit Sandhu FreqInOut.Spin Propeller Tool Ver 1.2.6 18 Program 3 The program reads the frequency of a signal on the Input line and displays it on the LCD. The signal is read as the number of waves in 1 second. Controlled by Pot 1 Four Cogs are used COG COG COG COG GO reads the frequency COG_LCD displays values on LCD FREQ_GEN generates the frequency COG_OUT generates the 5 freq
}} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 freq5 =25 input =26 output =27 VAR long long long long long long long long
'The system clock spec 'crystal '5X freq line 'line for input for what is to be read 'line for output of what is generated 'these are the variables 'For CogOne 'For freq_gen 'For freq_out 'read frequency
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