Chief Delphi - Question about QuadEncoders [C++]

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beefy1

26-12-2008 16:55

Question about QuadEncoders [C++]

what does the Get function in Encoder class return? detailed explaination if you can, please :)

tdlrali

26-12-2008 18:24

Re: Question about QuadEncoders [C++]

from Encoder.cpp:

Code:

/**

 * Gets the current count.

 * Returns the current count on the QuadEncoder.

 * @return Current count from the QuadEncoder.

 */

INT32 Encoder::Get(void)

{

        INT32 value = m_encoder->readOutput_Value(&status);

        wpi_assertCleanStatus(status);

        return value;

}

It returns the number of pulses received since the encoder was initialized or the count was reset.

Your other option is GetPeriod, which:
"Returns the period of the most recent Quad Encoder pulse in microseconds."

beefy1

27-12-2008 11:46

Re: Question about QuadEncoders [C++]

well, but what happened if I change the direction, will the Get function give me the duplication of ticks or maybe the distance it passed?:confused:

Daniel_LaFleur

27-12-2008 11:54

Re: Question about QuadEncoders [C++]

Quote:

Originally Posted by beefy1 (Post 787452)

well, but what happened if I change the direction, will the Get function give me the duplication of ticks or maybe the distance it passed?:confused:

Get Encoder does not get "ticks". It reads the number of counts from it's initialization/last reset. As the encoder turns in its forward direction it increases the encoder counts, as it turns in its reverse direction it decreases the encoder counts (even going negative).

I am not sure if GetPeriod will return a negative encoder period or not.

tdlrali

27-12-2008 12:17

Re: Question about QuadEncoders [C++]

No, GetPeriod will not return a negative number. It simply returns time passed between the last two pulses.

And yes, Daniel is right about the values Get() returns.

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