AT42QT1070 Class Reference

C++ API for the Atmel AT42QT1070 QTouch sensor. More...

Detailed Description

• ID: at42qt1070
• Name: Atmel AT42QT1070 QTouch Sensor
• Category: touch
• Manufacturer: seeed
• Connection: i2c

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

It was developed using the Grove Q Touch Sensor board.

  // Instantiate an AT42QT1070 on I2C bus 0

  upm::AT42QT1070 *touch = new upm::AT42QT1070(AT42QT1070_I2C_BUS, 
                                               AT42QT1070_DEFAULT_I2C_ADDR);

  while (shouldRun)
    {
      touch->updateState();
      printButtons(touch);
      usleep(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)
void	updateState ()
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	the address for this sensor

~AT42QT1070

(

)

AT42QT1070 Destructor

Member Function Documentation

bool writeByte	(	uint8_t	reg,
		uint8_t	byte
	)

Write byte value into register

Parameters

reg	register location to write into
byte	byte to write

Returns

true if successful

bool writeWord	(	uint8_t	reg,
		uint16_t	word
	)

Write word value at 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 byte value from register

Parameters

reg	register location to read from

Returns

value at specified register

uint16_t readWord

(

uint8_t

reg

)

Read word value from 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 at specified register

void updateState

(

)

Read the current touch status and detection state

Returns

key status bits for all keys (0-6)

bool isOverflowed ( )

inline

return the overflow indicator

Returns

true if overflow indicated

bool isCalibrating ( )

inline

return the calibrating indicator

Returns

true if calibration is in progress

bool reset

(

)

Issue a reset command

Returns

true if reset successful

bool calibrate

(

)

Issue a calibrate command

Returns

true if calibrate successful

uint8_t getButtons ( )

inline

Get the current button states

Returns

the button states

---

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

• /var/lib/jenkins/workspace/upm-doc-stable/src/at42qt1070/at42qt1070.h
• /var/lib/jenkins/workspace/upm-doc-stable/src/at42qt1070/at42qt1070.cxx