Quadrature Encoder Interface. More...

#include <QEI.h>

Public Member Functions
	QEI (PinName channelA, PinName channelB, PinName index, int pulsesPerRev)
	Constructor.
void	reset (void)
	Reset the encoder.
int	getCurrentState (void)
	Read the state of the encoder.
int	getPulses (void)
	Read the number of pulses recorded by the encoder.

Detailed Description

Quadrature Encoder Interface.

Definition at line 127 of file QEI.h.

Constructor & Destructor Documentation

Constructor.

Reads the current values on channel A and channel B to determine the initial state.

Attaches the encode function to the rise/fall interrupt edges of channels A and B to perform X4 encoding.

Attaches the index function to the rise interrupt edge of channel index (if it is used) to count revolutions.

Parameters:

channelA	mbed pin for channel A input.
channelB	mbed pin for channel B input.
index	mbed pin for optional index channel input, (pass NC if not needed).
pulsesPerRev	Number of pulses in one revolution.

Definition at line 112 of file QEI.cpp.

int getCurrentState ( void )

Read the state of the encoder.

Returns:: The current state of the encoder as a 2-bit number, where: bit 1 = The reading from channel B bit 2 = The reading from channel A

Definition at line 148 of file QEI.cpp.

int getPulses ( void )

Read the number of pulses recorded by the encoder.

Definition at line 154 of file QEI.cpp.

void reset ( void )

Reset the encoder.

Sets the pulses and revolutions count to zero.

Definition at line 141 of file QEI.cpp.