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Quadrature Encoder (QEI)

bool ROM_QEIErrorGet (uint32_t ui32Base)

void ROM_QEIIntClear (uint32_t ui32Base, uint32_t ui32IntFlags)

void ROM_QEIIntDisable (uint32_t ui32Base, uint32_t ui32IntFlags)

void ROM_QEIIntEnable (uint32_t ui32Base, uint32_t ui32IntFlags)

uint32_t ROM_QEIIntStatus (uint32_t ui32Base, bool bMasked)

uint32_t ROM_QEIPositionGet (uint32_t ui32Base)

void ROM_QEIPositionSet (uint32_t ui32Base, uint32_t ui32Position)

void ROM_QEIVelocityConﬁgure (uint32_t ui32Base, uint32_t ui32PreDiv, uint32_t

ui32Period)

void ROM_QEIVelocityDisable (uint32_t ui32Base)

void ROM_QEIVelocityEnable (uint32_t ui32Base)

uint32_t ROM_QEIVelocityGet (uint32_t ui32Base)

16.2.1 Function Documentation

16.2.1.1 ROM_QEIConﬁgure

Conﬁgures the quadrature encoder.

Prototype:

void

ROM_QEIConfigure(uint32_t ui32Base,

uint32_t ui32Config,

uint32_t ui32MaxPosition)

ROM Location:

ROM_APITABLE is an array of pointers located at 0x0100.0010.

ROM_QEITABLE is an array of pointers located at ROM_APITABLE[9].

ROM_QEIConfigure is a function pointer located at ROM_QEITABLE[3].

Parameters:

ui32Base is the base address of the quadrature encoder module.

ui32Conﬁg is the conﬁguration for the quadrature encoder. See below for a description of this

parameter.

ui32MaxPosition speciﬁes the maximum position value.

Description:

This will conﬁgure the operation of the quadrature encoder. The ui32Conﬁg parameter provides

the conﬁguration of the encoder and is the logical OR of several values:

QEI_CONFIG_CAPTURE_A or QEI_CONFIG_CAPTURE_A_B to specify if edges on

channel A or on both channels A and B should be counted by the position integrator and

velocity accumulator.

QEI_CONFIG_NO_RESET or QEI_CONFIG_RESET_IDX to specify if the position inte-

grator should be reset when the index pulse is detected.

QEI_CONFIG_QUADRATURE or QEI_CONFIG_CLOCK_DIR to specify if quadrature sig-

nals are being provided on ChA and ChB, or if a direction signal and a clock are being

provided instead.

QEI_CONFIG_NO_SWAP or QEI_CONFIG_SWAP to specify if the signals provided on

ChA and ChB should be swapped before being processed.

176 April 8, 2013

Brand	Texas Instruments
Model	Tiva TM4C123GH6PM
Category	Microcontrollers
Language	English

Texas Instruments Tiva TM4C123GH6PM User Manual

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