Gt911 Register Map |verified|

for reading coordinates from a specific platform like Arduino or STM32?

| Address | R/W | Name | Description | |---------|-----|------|--------------| | 0x8040 | R | Product ID (first byte) | Usually '9' | | 0x8041 | R | Product ID (second byte) | Usually '1' | | 0x8042 | R | Product ID (third byte) | Usually '1' | | 0x8043 | R | Firmware version | Major/minor | | 0x8044 | R | Resolver version | -- | | 0x8045 | R | Patch version | -- | | 0x8046 - 0x8047 | R | Vendor ID | -- | | 0x8048 - 0x804A | R | LCD X resolution | Bytes: LSB, MSB, reserved | | 0x804B - 0x804D | R | LCD Y resolution | Bytes: LSB, MSB, reserved | | 0x804E | R/W | Config checksum (high) | Used for verification | | 0x804F | R/W | Config checksum (low) | Used for verification | | 0x8050 | R | Number of touch points | 0x00 =no touch, 0x01 - 0x05 | | 0x8051 | R | Gesture ID | 0x00 =none, 0x01 =slide up/down, etc. |

Today, the GT911 register map is almost fully public, mostly thanks to leaked datasheets appearing on GitHub and sites like Linux Hardware Database . gt911 register map

. Its memory space is logically divided into four primary functional blocks: Register Range Description Access Type 0x8040 – 0x8046 Command and Status Read/Write (R/W) 0x8047 – 0x80FF Device Configuration Read/Write (R/W) 0x8100 – 0x813F Coordinate Data (Touch Points) Read-Only (R) 0x8140 – 0x814E Product ID and Hardware Info Read-Only (R) 2. Core Functional Blocks Command & Status (0x8040 – 0x8046)

Below is the essential register map broken into functional groups. All addresses are in hex. for reading coordinates from a specific platform like

The starting point for the first touch. Data is usually formatted as: Programming Flow Initialize I2C: Set the speed (standard 100kHz or fast 400kHz). Configuration: (Optional) Write parameters to if you need to change the screen resolution or orientation. Polling Loop: Read register Check if Bit 7 is high.

Ah, the (0x8047 to 0x80FF). This is where the GT911 shows its personality. You want to change the refresh rate? Swap the X/Y coordinates? Adjust the sensitivity for a thick glass lens? You have to write a 184-byte configuration array. All addresses are in hex

Are you trying to or just trying to get the first touch coordinates to show up? GT911 Programming Guide - Orient Display