.net barcode scanner sdk Illustration of a PWM signal in Software

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Illustration of a PWM signal
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vary the pulse durations because it is a very precise tool for this task. Because the counter module can be configured to deliver the pulse independently, this makes it possible for the cog to attend to other tasks while the pulse gets delivered.
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In this experiment, we discuss Counter A (CTRA); however, counter B is identical. For a counter module tutorial, consult the Counter Modules and Circuit Applications chapter in Propeller Education Kit Labs: Fundamentals. Also, read the descriptions of the counters in the Propeller Manual. (That material is not repeated here.) Read the sections on the CTRA, FRQA, and PHSA registers. The three registers work in concert, so their functions and interactions need to be considered collectively. Each counter is configured by a 32-bit control register. Counter A is configured by the CTRA register, and Counter B is configured by CTRB. Each control register contains bit fields with the following information: Specification of a counter mode Identification of pin A Identification of pin B Specification of a dividing factor CTRMODE APIN BPIN PLLDIV (Div factor is for PLL mode.)
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The information is entered into the control register by setting and clearing relevant bits in the register. We have control of all the bits in the register, but not all bits are relevant. The counter mode that we specify determines how the counter will behave. In the PLL mode, the dividing factor manages how rapidly the process progresses. All this will be much easier to understand as we look at the PWM example identified earlier.
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Of special interest to us at this time is the specification of the pin number that is going to output information from the counter. This number, which can vary from 0 to 31, is specified in bits 0 to 5 and is called the APIN bit field. We will use I/O pin P7. If the counter gets configured to interact with a second I/O pin, that number would be specified in bits 9 to 14, which is the BPIN bit field. Our example will only use the APIN field. If we were to use the phase locked loop (PLL) modes for generating high frequency signals, we would also need to specify a number in the PLLDIV bit field (bits 25..23) as a step in determining the final frequency. We will not utilize PLL mode
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in this text, so the details are not covered here. However, you can find out more about it in the Propeller Manual as well as in the Propeller Education Kit Labs: Fundamentals textbook. Both are available for download from Parallax.com. The 32 modes in which the counter can operate and the use of these modes are beyond our interests at this time; however, the 32 modes are specified by five bits in the counter control register. These bits go from bit 30 to bit 26. We are interested in a PWM operation. This is specified by setting these bits to 00100. See Table 2-7 in the Propeller Manual. An application note that describes counter operations is available from the Parallax downloads site, but it is rather advanced for beginners. (The first mode, 00000, is counter off. )
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Using Counter A for PWM Generation
A close look at Figure 7-2 indicates that we have to coordinate the operation of two signals. We have to make a signal go high at a fixed rate to set the cycle time, and we have to maintain a variable cycle time within this signal to set the pulse width. (Counters are much more complicated and versatile than that, but this is enough information for us at this time.) First, we have to specify the mode we want the counter to operate in. The singleended PWM mode is specified by setting CTRA[30..26] to binary 00100 with the following code:
ctra[30..26]:=%00100
Next we identify pin A as the pin the signal will be expressed on:
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