Gt911 Register Map < Official Cheat Sheet >

uint8_t status = i2c_read_byte(0x8148); if (status & 0x80) uint8_t touches = i2c_read_byte(0x8149); for (int i = 0; i < touches; i++) i2c_read_byte(base+1); y = i2c_read_byte(base+4) << 8 i2c_write_byte(0x814E, 0x00); // clear status

| Addr | Field | Range | Description | |------|-------|-------|-------------| | 0x8040 | Config Version | 0x01–0xFF | Config structure version | | 0x8041 | X Output Max (LSB) | 0–255 | Touch panel X resolution (low byte) | | 0x8042 | X Output Max (MSB) | 0–255 | High byte | | 0x8043 | Y Output Max (LSB) | 0–255 | Touch panel Y resolution (low byte) | | 0x8044 | Y Output Max (MSB) | 0–255 | High byte | | 0x8045 | Touch Number | 1–5 | Max simultaneous touches | | 0x8046 | Module Switch 1 | Bitfield | Interrupt/gesture modes | | 0x8047 | Module Switch 2 | Bitfield | Noise reduction, glove mode | | 0x8048 | Touch Threshold | 0–255 | Touch activation threshold (default 0x28) | | 0x8049 | Touch Release Threshold | 0–255 | Release detection threshold | | 0x804A | Sensitivity Factor | 0–255 | Analog gain (default 0x32) | | 0x804B | Noise Reduction | 0–255 | Filter level | | 0x804D | Key Threshold | 0–255 | For physical keys (if used) | | 0x8050 | Refresh Rate | 0–255 | Scan rate (Hz) | | 0x8051 | Gesture Enable | Bitfield | Enable/disable gestures | | ... | ... | ... | Extended config (up to 184 bytes) | gt911 register map