AT42QT1070 Class Reference

API for the Atmel AT42QT1070 QTouch Sensor. More...

Detailed Description

• ID: at42qt1070
• Name: Seven-channel QTouch Touch Sensor
• Other Names: Grove QTouch Sensor
• Category: touch
• Manufacturer: seeed
• Connection: i2c
• Link: http://wiki.seeed.cc/Grove-Q_Touch_Sensor/

This class implements support for the Atmel AT42QT1070 QTouch sensor, which supports 7 capacitive buttons.

It was developed using a Grove-Q Touch Sensor board.

    // Instantiate an AT42QT1070 on I2C bus 0

    upm::AT42QT1070 touch(AT42QT1070_I2C_BUS, AT42QT1070_DEFAULT_I2C_ADDR);

    while (shouldRun) {
        touch.updateState();
        printButtons(touch);
        upm_delay_us(100000);
    }

Public Types
enum	AT42QT1070_REG_T {   REG_CHIPID = 0, REG_FWVERS = 1, REG_DETSTATUS = 2, REG_KEYSTATUS = 3,   REG_KEYSIG0_H = 4, REG_KEYSIG0_L = 5, REG_KEYSIG1_H = 6, REG_KEYSIG1_L = 7,   REG_KEYSIG2_H = 8, REG_KEYSIG2_L = 9, REG_KEYSIG3_H = 10, REG_KEYSIG3_L = 11,   REG_KEYSIG4_H = 12, REG_KEYSIG4_L = 13, REG_KEYSIG5_H = 14, REG_KEYSIG5_L = 15,   REG_KEYSIG6_H = 16, REG_KEYSIG6_L = 17, REG_REFDATA0_H = 18, REG_REFDATA0_L = 19,   REG_REFDATA1_H = 20, REG_REFDATA1_L = 21, REG_REFDATA2_H = 22, REG_REFDATA2_L = 23,   REG_REFDATA3_H = 24, REG_REFDATA3_L = 25, REG_REFDATA4_H = 26, REG_REFDATA4_L = 27,   REG_REFDATA5_H = 28, REG_REFDATA5_L = 29, REG_REFDATA6_H = 30, REG_REFDATA6_L = 31,   REG_NTHR0 = 32, REG_NTHR1 = 33, REG_NTHR2 = 34, REG_NTHR3 = 35,   REG_NTHR4 = 36, REG_NTHR5 = 37, REG_NTHR6 = 38, REG_AVE0 = 39,   REG_AVE1 = 40, REG_AVE2 = 41, REG_AVE3 = 42, REG_AVE4 = 43,   REG_AVE5 = 44, REG_AVE6 = 45, REG_DI0 = 46, REG_DI1 = 47,   REG_DI2 = 48, REG_DI3 = 49, REG_DI4 = 50, REG_DI5 = 51,   REG_DI6 = 52, REG_GUARD = 53, REG_LP = 54, REG_MAXON = 55,   REG_CALIBRATE = 56, REG_RESET = 57 }
enum	AT42QT1070_DET_T { DET_TOUCH = 0x01, DET_OVERFLOW = 0x40, DET_CALIBRATE = 0x80 }

Public Member Functions
	AT42QT1070 (int bus, uint8_t address=AT42QT1070_DEFAULT_I2C_ADDR)
	~AT42QT1070 ()
bool	writeByte (uint8_t reg, uint8_t byte)
bool	writeWord (uint8_t reg, uint16_t word)
uint8_t	readByte (uint8_t reg)
uint16_t	readWord (uint8_t reg)
uint8_t	readChipID (void)
void	updateState ()
uint8_t	getLPMode (void)
uint8_t	setLPMode (uint8_t mode)
uint8_t	getAVE (uint8_t key)
uint8_t	setAVE (uint8_t key, uint8_t ave)
uint8_t	getAKSGroup (uint8_t key)
uint8_t	setAKSGroup (uint8_t key, uint8_t group)
bool	isOverflowed ()
bool	isCalibrating ()
bool	reset ()
bool	calibrate ()
uint8_t	getButtons ()

Constructor & Destructor Documentation

AT42QT1070	(	int	bus,
		uint8_t	address = AT42QT1070_DEFAULT_I2C_ADDR
	)

AT42QT1070 constructor

Parameters

bus	I2C bus to use
address	Address for this sensor

~AT42QT1070

(

)

AT42QT1070 destructor

Member Function Documentation

bool writeByte	(	uint8_t	reg,
		uint8_t	byte
	)

Writes a byte value into the register

Parameters

reg	Register location to write into
byte	Byte to write

Returns

True if successful

bool writeWord	(	uint8_t	reg,
		uint16_t	word
	)

Writes a word value into the register. Note: the device must have the auto-increment bit set in the MODE1 register to work.

Parameters

reg	Register location to write into
word	Word to write

Returns

True if successful

uint8_t readByte

(

uint8_t

reg

)

Read a byte value from the register

Parameters

reg	Register location to read from

Returns

Value in the specified register

uint16_t readWord

(

uint8_t

reg

)

Read a word value from the register. Note: the device must have the auto-increment bit set in the MODE1 register to work.

Parameters

reg	Register location to read from

Returns

Value in the specified register

uint8_t readChipID

(

void

)

Reads the Chip ID register on the sensor

Returns

Value of the Chip ID register

void updateState

(

)

Reads the current touch status and detection state

Returns

Key status bits for all keys (0-6)

uint8_t getLPMode

(

void

)

Reads the current low-power mode setting

Returns

Low-power mode setting from the sensor

uint8_t setLPMode

(

uint8_t

mode

)

Changes the low-pomer mode setting on the sensor

Parameters

mode	dDsired new mode

Returns

New setting on the sensor

uint8_t getAVE

(

uint8_t

key

)

Reads the current averaging factor setting for a key

Parameters

key	Key being read

Returns

Averaging factor

uint8_t setAVE	(	uint8_t	key,
		uint8_t	ave
	)

Changes the averaging factor setting for a key

Parameters

key	Key being changed
ave	New averaging factor

Returns

New averaging factor as read from the device

uint8_t getAKSGroup

(

uint8_t

key

)

Reads the AKS group of which a key is part

Parameters

key	Key (0-6) being queried

Returns

AKS group of which the key is part

uint8_t setAKSGroup	(	uint8_t	key,
		uint8_t	group
	)

Changes the AKS group of which a key is part

Parameters

key	Key (0-6) being changed
group	New group for the key

Returns

New value on the sensor

bool isOverflowed ( )

inline

Returns the overflow indicator

Returns

True if overflow is indicated

bool isCalibrating ( )

inline

Returns the calibrating indicator

Returns

True if calibration is in progress

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bool reset

(

)

Issues a reset command

Returns

True if successful

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bool calibrate

(

)

Issues a calibrate command

Returns

True if successful

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uint8_t getButtons ( )

inline

Gets the current button states

Returns

Button states

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The documentation for this class was generated from the following files:

• src/at42qt1070/at42qt1070.hpp
• src/at42qt1070/at42qt1070.cxx