The community discovered that the GT911 had a very specific "personality" defined by its register addresses:
This register accepts several commands to change the chip's state. Key commands include:
This register indicates if a touch event has occurred and how many points are currently being touched.
The GT911 Register Map: The Digital Nervous System of Touch gt911 register map
Returns a 16-bit hex value indicating the currently flashed patch or firmware version. 2. Configuration Registers ( 0x8040 – 0x80FE )
E.g., 0x00 0x03 (320 pixels) or 0x00 0x04 (480 pixels). 0x804A-0x804B (Resolution Y): Defines Y-axis resolution.
The GT911 register space is divided into functional blocks for commands, configuration, and coordinate reporting. STMicroelectronics Community GOODiX GT911 Programming Guide 2014-08-04_Rev.00 The community discovered that the GT911 had a
The GT911 is a powerful and versatile touch controller that is made accessible through its well-structured register map. By understanding the function of the configuration block ( 0x8047 ), the critical role of the checksum, the importance of the status register ( 0x814E ), and the proper initialization sequence, you can effectively build a reliable touch driver for any embedded system. The map is your blueprint; the registers are your tools. Mastering them unlocks the full potential of the GT911 for your next interactive product.
The GT911 from Goodix is a widely used capacitive touch controller, particularly popular in 7-inch to 8-inch MIDs, DIY projects, and industrial displays. It supports up to 5-point multi-touch and is prized for its reliability, low power consumption, and various advanced features like gesture recognition and the HotKnot data transfer protocol.
The GT911 register map is a set of memory-mapped registers that store configuration data, control the chip's behavior, and report touch events. The register map is divided into several sections, each serving a specific purpose: The GT911 register space is divided into functional
To read real-time touch events, your microcontroller should poll these registers or trigger an interrupt when the GT911's INT pin pulls low. The Buffer Status Register (0x8140) This is the most critical register for data retrieval.
If fresh data is available, the host can then read a contiguous block of registers to get information for up to 5 touches. The data for each touch point is structured as follows:
The coordinate zone is a dynamic, read-only window pulled during every interrupt cycle to capture active user interactions. The Touch Status Register ( 0x8140 ) This byte acts as the primary gatekeeper for touch polling:
