: Normally black mode. When no voltage is applied, the LCD panel appears black, offering better contrast for dark UI themes.
The identifier typically refers to a configuration or driver setup for a 7-inch to 10-inch capacitive touchscreen panel using the Goodix GT9xx series controller (such as the GT911, GT927, or GT928) with a display resolution of 1024x600 pixels . Technical Overview
: The GT9xx series is known for its high signal-to-noise ratio (SNR), which is critical for stable touch performance in environments with high electromagnetic interference, such as car dashboards.
Ordering and variants
: Check the I2C address. Goodix chips typically use 0x5D or 0x14 depending on the state of the Reset and Interrupt pins during power-up.
&i2c2 status = "okay"; gt911@14 compatible = "goodix,gt911"; reg = <0x14>; // I2C address irq-gpio = <&gpio1 5 IRQ_TYPE_LEVEL_LOW>; rst-gpio = <&gpio1 3 GPIO_ACTIVE_HIGH>; pwr-gpio = <&gpio0 10 GPIO_ACTIVE_HIGH>; max-x = <1024>; max-y = <600>; gt-type = <1>; // Chip type identifier ; ;
The GT9xx controller typically supports two I2C slave addresses, selected during the power-on sequence via the INT/RST pins: gt9xx-1024x600
The keyword represents two critical technical specifications working in tandem:
2.8V to 3.3V digital logic compatibility. Sensor Configuration
The GT9xx controller family possesses several distinctive technical characteristics: : Normally black mode
: Many units using this configuration feature IPS panels, offering wide viewing angles and sunlight legibility, which are essential for outdoor and vehicle use. Software and Driver Integration
gt9xx: gt9xx@5d compatible = "goodix,gt911"; /* or gt9271 */ reg = <0x5d>; interrupt-parent = <&gpio>; interrupts = <17 0>; /* GPIO 17, falling edge */ reset-gpios = <&gpio 27 0>; /* GPIO 27 */
: Common issues during setup include inverted X/Y axes or swapped coordinates. These are typically fixed by adjusting the touchscreen-inverted-x or touchscreen-swapped-x-y flags in the system configuration. Technical Overview : The GT9xx series is known
: These controllers communicate with a host CPU (like an ARM-based SoC or a Raspberry Pi) via the I2C protocol .
&i2c1 status = "okay"; touchscreen@5d compatible = "goodix,gt911"; reg = ; interrupt-parent = <&gpio>; interrupts = ; /* GPIO 4, IRQ_TYPE_EDGE_FALLING */ irq-gpios = <&gpio 4 0>; reset-gpios = <&gpio 17 0>; touchscreen-size-x = ; touchscreen-size-y = ; ; ; Use code with caution. Android and Custom Embeded Firmware