: If your screen has a specific resolution (e.g., 800x480), you must write these values to the configuration registers starting at 0x8047 . Reading Touch Data :
If monitoring the screen via hardware interrupts, wait for the INT pin to toggle. If polling: Read register 0x814E .
Typical startup config area (example offsets): gt911 register map
: Number of touch points actively detected (integer range 0 to 5). 0x814F – 0x8156 (Touch Point 1 Block) :
The GT911 registers are 8-bit wide, addressed by a 16-bit value starting from 0x8000 . The memory map can be divided into three main sections: : If your screen has a specific resolution (e
uint16_t x = ((uint16_t)touch_data[2] << 8)
Always send two bytes for the register address (High byte then Low byte) before reading or writing data. Typical startup config area (example offsets): : Number
Bit-shift the high and low bytes for each active track ID to get the
If you want to dive deeper into hardware integration, let me know:
Isolate bits 3..0 to determine how many fingers are touching the panel (e.g.,