: After writing config registers, you must write 0x00 to 0x8100 and then set 0x8100 = 0x01 to apply.

if (status & 0x80) // new data int touches = (status >> 4) & 0x07; if (touches >= 1) touch_data[3]; // x and y are now coordinates

The GT911 is one of the most popular capacitive touchscreen controllers on the market, particularly in the industrial, automotive, and DIY maker communities. Manufactured by Goodix (formerly known as Shenzhen Huiding Technology), this chip offers excellent sensitivity, supports up to 5 simultaneous touch points (though often marketed for single-touch and gestures), and is famously used in devices like the Raspberry Pi’s official 7-inch touchscreen, the Librem 5 phone, and countless ESP32 and STM32 projects.