Gt911 Register Map 🔥

#define GT911_ADDR 0x5D #define GT911_STATUS 0x8009 #define GT911_TOUCH1 0x8010

If you read register 0x8000 and always get 0x00 , your I²C is working, but the GT911 is not initialized. Ensure you performed the hardware reset sequence correctly. Many libraries forget to pull before reset.

typedef struct uint8_t track_id; uint16_t x; uint16_t y; uint16_t size; gt911_touch_t;

If you want to delve into a specific part of the setup, let me know: gt911 register map

The GT911 communicates via a standard I2C interface, typically using 16-bit register addresses. The register map is logically divided into several functional zones, spanning from 0x8000 upwards. The core functional areas include:

For detailed register mapping diagrams and I2C timing diagrams, refer to the official GT911 Programming Guide .

As highlighted earlier, updating configuration requires special care. The GT911 verifies a checksum over the config block on boot; if the checksum is invalid, it will ignore the new settings and use defaults. This behavior makes the checksum calculation step mandatory for any successful configuration update. typedef struct uint8_t track_id; uint16_t x; uint16_t y;

The Goodix GT911 is one of the most popular capacitive touch screen controllers used in embedded systems, DIY electronics, and consumer devices. It communicates primarily over the I2C interface, allowing microcontrollers like Arduino, ESP32, STM32, and Raspberry Pi to read touch coordinates and configure panel settings.

A 16-bit value specifying the maximum pixel resolution of the Y-axis (Low byte at 0x804A , High byte at 0x804B ).

The GT911 register map is divided into functional zones based on memory address ranges. This structure simplifies reading coordinates and writing configuration changes. allowing microcontrollers like Arduino

This specific address often contains the "Buffer Status," which indicates the number of active touch points. Touch Information:

These registers manage the operational state of the chip dynamically.

is a popular 5-point capacitive touch controller that communicates via

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.

Use the INT pin to trigger the I2C reading process. The INT pin will typically go low when a touch is detected or released.