Gt911 Register Map Verified Jun 2026

Used to trigger actions like sending data or calibrating.

The lower 4 bits of register 0x814E tell you how many fingers (0–5) are currently on the screen.

The is a widely utilized, high-performance capacitive touch panel controller manufactured by Goodix. It is popular in embedded systems, DIY electronics, and IoT devices (like those using ESP32 or Raspberry Pi) due to its responsiveness and support for multi-touch.

— Refresh/config load control & checksum. gt911 register map

To interface with the GT911 using a microcontroller like an ESP32, STM32, or Arduino, you must interact directly with its internal register map. This guide provides a detailed breakdown of the GT911 register space, focusing on initialization, configuration, and reading coordinates. GT911 Memory Map Overview

After reading the coordinates, your driver must write 0x00 back to register 0x814E to clear the buffer flag. Failure to do so will cause the GT911 to stop sending new touch data. Coordinate Point Mapping

A 16-bit value specifying the maximum pixel resolution of the Y-axis (Low byte at 0x804A , High byte at 0x804B ). Used to trigger actions like sending data or calibrating

The standard way to read data is by polling the 0x814E register.

This register is used to send operational commands to the GT911. Common commands include: Read coordinates status. 0x05: Screen off mode.

Set INT pin Low during Reset.

Must be updated when configuration changes.

| Start Addr | End Addr | Size (bytes) | Name / Section | Type | Description | | :--- | :--- | :--- | :--- | :--- | :--- | | 0x8000 | 0x8000 | 1 | Product ID (MSB) | RO | First char of ID (e.g., '9') | | 0x8001 | 0x8001 | 1 | Product ID | RO | Second char (e.g., '1') | | 0x8002 | 0x8002 | 1 | Product ID | RO | Third char (e.g., '1') | | 0x8003 | 0x8003 | 1 | Product ID (LSB) | RO | Fourth char (e.g., 0x00 for string end) | | 0x8004 | 0x8004 | 1 | Firmware Version | RO | Major/minor version | | 0x8005 | 0x8005 | 1 | X Output Maximum (MSB) | RO | Reserved / default | | 0x8006 | 0x8006 | 1 | X Output Maximum (LSB) | RO | Reserved / default | | 0x8007 | 0x8007 | 1 | Y Output Maximum (MSB) | RO | Reserved / default | | 0x8008 | 0x8008 | 1 | Y Output Maximum (LSB) | RO | Reserved / default | | 0x8009 | 0x800F | 7 | Reserved / Status | RO | Touch count & flags | | 0x8010 | 0x8024 | 21 | Point 1 Data (TrackID, X, Y, Size) | RO | First touch report | | 0x8025 | 0x8039 | 21 | Point 2 Data | RO | Second touch report | | 0x803A | 0x804E | 21 | Point 3 Data | RO | Third touch report | | 0x804F | 0x8063 | 21 | Point 4 Data | RO | Fourth touch report | | 0x8064 | 0x8078 | 21 | Point 5 Data | RO | Fifth touch report | | 0x8079 | 0x807E | 6 | Reserved / Checksum | RO | Touch protocol integrity | | 0x8040 | 0x8040 | 1 | Gesture ID | RO | Up/Down/Left/Right/Double-Click | | 0x8041 | 0x80FF | 191 | Reserved | - | Not documented | | 0x8100 | 0x8100 | 1 | Config Version | RW | Configuration version number | | 0x8101 | 0x8101 | 1 | X Resolution (MSB) | RW | Screen width (max touch X) | | 0x8102 | 0x8102 | 1 | X Resolution (LSB) | RW | Screen width | | 0x8103 | 0x8103 | 1 | Y Resolution (MSB) | RW | Screen height (max touch Y) | | 0x8104 | 0x8104 | 1 | Y Resolution (LSB) | RW | Screen height | | 0x8105 | 0x8105 | 1 | Touch Threshold | RW | Finger detection sensitivity (default 80) | | 0x8106 | 0x8106 | 1 | Active (Screen-On) Gain | RW | Amplification factor for touch | | 0x8107 | 0x8107 | 1 | Standby (Screen-Off) Gain | RW | Low-power detection gain | | 0x8108 | 0x8108 | 1 | Debounce | RW | Number of consecutive samples (1-10) | | 0x8109 | 0x8109 | 1 | Noise Reduction | RW | Filter level (0-7) | | 0x810A | 0x810A | 1 | Screen Touch Level | RW | Reserved | | 0x810B | 0x810B | 1 | Proximity Enable | RW | Enable/Disable proximity sensing | | 0x810C | 0x810C | 1 | Handheld/Pen Enable | RW | Mode selection for stylus | | 0x810D | 0x811D | 17 | Key Area Array | RW | Physical button mapping | | 0x811E | 0x812F | 18 | Proximity & Noise Settings | RW | Advanced tuning | | 0x8130 | 0x813F | 16 | Gesture Parameters | RW | Swipe angles, double-tap timing |

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 ). It is popular in embedded systems, DIY electronics,

For further details regarding power states and timings, review the Goodix Open Source Linux Drivers or reference community hardware platforms like Adafruit or Lvgl documentation for pre-built touchscreen handling integrations.