Difference between revisions of "Unit PWM"
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| + | Pulse Width Modulation (PWM) is a technique of encoding a pulsed signal so as to control the ratio of on to off by switching the signal between on and off at a very high rate. | ||
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| + | This on and off switching allows control of the average power supplied to the load and therefore gives fine grained control of things such as motor speeds, lamp dimming and heating elements. | ||
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| + | PWM is also used in many low power applications as well such as controlling servo motors and can even by used for audio applications such as class D amplifiers. | ||
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| + | This unit deals with the usage of PWM for control applications (for audio applications see the Audio unit) and provides methods to control the state, frequency, duty cycle, range and mode of PWM host controllers. Not all devices support all of these concepts so this API includes a properties function to allow obtaining information about a PWM device and its capabilities. | ||
=== Constants === | === Constants === | ||
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| + | '''Initialization functions''' | ||
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| + | <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;"> | ||
| + | <pre style="border: 0; padding-bottom:0px;">procedure PWMInit;</pre> | ||
| + | <div style="font-size: 14px; padding-left: 12px;">'''Description:''' Initialize the PWM unit and PWM device table</div> | ||
| + | <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;"> | ||
| + | {| class="wikitable" style="font-size: 14px; background: white;" | ||
| + | |- | ||
| + | ! '''Note''' | ||
| + | | Called only during system startup | ||
| + | |- | ||
| + | |} | ||
| + | </div></div> | ||
| + | <br /> | ||
Return to [[Unit_Reference|Unit Reference]] | Return to [[Unit_Reference|Unit Reference]] | ||
Revision as of 04:08, 2 September 2016
Return to Unit Reference
Description
Pulse Width Modulation (PWM) is a technique of encoding a pulsed signal so as to control the ratio of on to off by switching the signal between on and off at a very high rate.
This on and off switching allows control of the average power supplied to the load and therefore gives fine grained control of things such as motor speeds, lamp dimming and heating elements.
PWM is also used in many low power applications as well such as controlling servo motors and can even by used for audio applications such as class D amplifiers.
This unit deals with the usage of PWM for control applications (for audio applications see the Audio unit) and provides methods to control the state, frequency, duty cycle, range and mode of PWM host controllers. Not all devices support all of these concepts so this API includes a properties function to allow obtaining information about a PWM device and its capabilities.
Constants
To be documented
Type definitions
To be documented
Public variables
To be documented
Function declarations
Initialization functions
procedure PWMInit;
| Note | Called only during system startup |
|---|
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