GT911Adapter

Class

Source: GT911Adapter.h

Description

GT911 I2C touch controller driver

Hardware: GT911 (Goodix) - common on higher-quality touch panels Protocol: I2C (independent bus from display SPI) Sampling: 100Hz+ Filtering: Minimal (passthrough - controller does processing)

I2C bus is independent - no DMA coordination needed Supports 5-point multi-touch

TIP

I2C bus is independent - no DMA coordination needed

TIP

Supports 5-point multi-touch

Methods

static bool initImpl()

Description:

Initialize GT911 hardware

Returns: true if successful

static bool readImpl(TouchPoint* points, uint8_t& count)

Description:

Read touch data from GT911

Parameters:

• points: Output buffer
• count: Number of points read

Returns: true if successful

static void setCalibrationImpl(const TouchCalibration& calib)

Description:

Set calibration parameters

Parameters:

• calib: Calibration data

static bool isConnectedImpl()

Description:

Check if controller is connected

Returns: true if responding

static uint8_t readRegister(uint8_t addr)

Description:

Read a single register from GT911

Parameters:

• addr: Register address

Returns: Register value

static int16_t readCoordinate(uint8_t addr)

Description:

Read a 16-bit coordinate from GT911

Parameters:

• addr: Register address (LSB first)

Returns: Coordinate value

static void writeRegister(uint8_t addr, uint8_t value)

Description:

Write a register to GT911

Parameters:

• addr: Register address
• value: Value to write

static uint32_t millis()

Description:

Platform-specific millis() function