Gt911 Register Map -

If Bit 7 is 0 , abort the read cycle and wait for the next interrupt.

The is a popular capacitive touch screen controller used in many small displays. Its register map is organized into four main functional blocks that you access via I2C . GT911 Register Map Summary

4 stars. One star deducted because the documentation for the config registers is scattered across three different versions of the datasheet. But the register map itself? Once you understand its quirks, it’s a reliable old friend. Just don’t forget to clear the buffer flag.

0x8150 / 0x8151 : Low and high bytes combining into a 16-bit integer for the absolute . gt911 register map

Sets the X and Y axis maximum coordinates. For example, a screen can be configured for depending on these values.

Determines the sensitivity required to trigger a "touch" event.

To calculate this, sum all byte values from register 0x8047 to 0x80FE . Take the complement of the sum (invert the bits), and add 1 (or simply compute 0x100 - (Sum % 0x100) ). If Bit 7 is 0 , abort the

The start of the data buffer for specific touch coordinates. Development Considerations Datasheed and Register map for the GT911

The GT911 register map provides a well-organized and powerful interface for integrating a high-performance capacitive touch controller into embedded projects. By mastering the communication protocol, address selection, and the functions of the core register regions, developers can unlock the full potential of the GT911. Whether you're writing a driver from scratch or debugging an existing implementation, a solid understanding of this register map is the key to delivering a responsive and reliable touch experience.

The register map is organized into functional blocks ranging from real-time commands to coordinate data reporting. Register Range Description Access Type Command and Status Read/Write (R/W) 0x8047 – 0x80FF Configuration Data Read/Write (R/W) 0x8100 – 0x813F Coordinate Data Read-Only (R) 0x8140 – 0x814E Product ID and Information Read-Only (R) Key Register Descriptions 1. Command Register (0x8040) GT911 Register Map Summary 4 stars

This forced the open-source community (particularly contributors to the Linux Kernel and projects like ESP32 Arduino core) to write "auto-detect" routines. The code had to probe the registers, trying to read the "Goodix" ID ( GT911 , GT9110 , etc.) stored in the read-only memory area (around 0x8140 to 0x8143 ) to decide which map to use.

Which (e.g., C++, MicroPython, Zephyr RTOS) is your firmware built on?

The byte-wise sum of all configuration registers from 0x8047 to 0x80FE , inverted ( ~sum + 1 ) or verified via standard complement depending on the silicon version.

The configuration data is often stored in a large byte array in the microcontroller's flash, which is then written to the 0x8047 region upon startup.

: Number of touch points actively detected (integer range 0 to 5). 0x814F – 0x8156 (Touch Point 1 Block) :