Goodix GT911 is a capacitive touch controller that uses an I2C interface to communicate with a host processor. The register map is divided into functional blocks for commands, configuration, and touch data status. I2C Communication Basics Slave Address: usually has two selectable 7-bit I2C addresses, , depending on the state of the pins during startup. Register Address Size: Unlike many simple I2C devices, the 16-bit register addresses Focus LCDs Key Register Map Blocks Address Range (Hex) Description Command Register Used to send real-time commands (e.g., reset, sleep). Configuration Registers
Contains the X/Y coordinates and pressure for up to 5 simultaneous touch points. Product Information Includes the Product ID , firmware version, and hardware ID. Commonly Used Registers 0x8140 – 0x8143 : Product ID (usually "911" in ASCII). gt911 register map
Then there's (Buffer Status). Bit 7 is the "Large Detect" flag (fat-finger protection), and Bit 0 is the "Buffer Ready" flag. This is the heartbeat of the device. Poll it, read the 5 touch points (each taking 8 bytes at 0x8150), and clear it by writing 0x00 back. It’s a clean, simple dance. Goodix GT911 is a capacitive touch controller that
The GT911 communicates as an I2C slave. Depending on the state of the INT and RESET pins during power-up, the device address can be either Register Address Size: Unlike many simple I2C devices,