Accessing this map via I²C is the key to configuration, calibration, and raw data acquisition. This article provides an exhaustive deep dive into the GT911 register map, from basic addressing to advanced gesture recognition.
This is the region the host MCU polls or responds to an interrupt to read when a finger touches the screen.
The core execution engine is governed by the Command register block. For security and Electrostatic Discharge (ESD) checking, commands valued greater than 0x07 require writing to a verification mirror register ( 0x8046 ) before updating the master command index ( 0x8040 ).
"Buffer Status". If set to 1, the host should read the touch data. After reading, the host write 0 back to this register to clear the flag. (Point 1 Coordinates): gt911 register map
A read/write area used to set touch thresholds, resolution, and sensor behavior. Coordinate/Status Data (0x814E and above):
Before reading or writing to any register, you must establish an I2C connection. The GT911 has two possible 7-bit I2C addresses. The address is selected during the chip’s power-on reset (POR) sequence by manipulating the state of the and Interrupt (INT) pins.
The day of the product launch finally arrived, and Alex's team was ready. The new smartphone was unveiled to great fanfare, and the response was overwhelmingly positive. The touch screen was smooth and responsive, thanks in large part to Alex's meticulous work on the GT911 register map. Accessing this map via I²C is the key
Known as the "Ready Flag." A value of 1 indicates that new, valid touch coordinates are present in the buffer. A value of 0 means data is still processing.
A 16-bit value specifying the vertical resolution of the LCD screen (Low Byte at 0x804A , High Byte at 0x804B ). Number of Touch Keys ( 0x804C ): Maximum allowed simultaneous touch points. The supports up to 5 points.
0x8154 / 0x8155 : Continuous 16-bit point target sizing scale data. The core execution engine is governed by the
Today, the GT911 register map is almost fully public, mostly thanks to leaked datasheets appearing on GitHub and sites like Linux Hardware Database .
The serves as the vital programming interface for developers building drivers to communicate with this widely used 5-point capacitive touch screen controller. It exposes 16-bit register addresses over an I2C interface, segmenting system control into four distinct spaces: real-time commands, device configuration profile arrays, touch status coordinates, and peripheral info logs.