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Use a 7 inch TFT display with RoadRunner SOM
This article explain how to manage a 7 inch TFT display using the DPI port of RoarRunner SOM
Wirings
Data lines:
Example of wiring in 666 mode with a TFT display:
| LCD 7 inch | |
|---|---|
| 1 VLED- | |
| 2 VLED+ | |
| 3 GND | GND |
| 4 3V3 | 3V3 |
| 5 R0 | GND |
| 6 R1 | GND |
| 7 R2 | PC22 |
| 8 R3 | PC23 |
| 9 R4 | PC24 |
| 10 R5 | PC25 |
| 11 R6 | PC26 |
| 12 R7 | PC27 |
| 13 G0 | GND |
| 14 G1 | GND |
| 15 G2 | PC16 |
| 16 G3 | PC17 |
| 17 G4 | PC18 |
| 18 G5 | PC19 |
| 19 G6 | PC20 |
| 20 G7 | PC21 |
| 21 B0 | GND |
| 22 B1 | GND |
| 23 B2 | PC10 |
| 24 B3 | PC11 |
| 25 B4 | PC12 |
| 26 B5 | PC13 |
| 27 B6 | PC14 |
| 28 B7 | PC15 |
| 29 GND | |
| 30 PCLK | PD0 |
| 31 DISP | 3V3 |
| 32 HSYNC | PC31 |
| 33 VSYNC | PC30 |
| 34 DE | PD1 |
| 35 NC | |
| 36 GND | GND |
| 37 NC | |
| 38 NC | |
| 39 NC | |
| 40 NC |
Device tree apb section
hlcdc: hlcdc@f0000000 {
status = "okay";
hlcdc-display-controller {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lcd_base &pinctrl_lcd_rgb666>;
port@0 {
#address-cells = <1>;
#size-cells = <0>;
hlcdc_panel_output: endpoint@0 {
reg = <0>;
remote-endpoint = <&panel_input>;
};
};
};
hlcdc_pwm: hlcdc-pwm {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lcd_pwm>;
};
};
backlight: backlight {
compatible = "pwm-backlight";
pwms = <&hlcdc_pwm 0 50000 0>;
brightness-levels = <0 4 8 16 32 64 128 255>;
default-brightness-level = <7>;
power-supply = <&bl_reg>;
status = "okay";
};
bl_reg: backlight_regulator {
compatible = "regulator-fixed";
regulator-name = "backlight-power-supply";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
status = "okay";
};
panel: panel {
/* compatible = "pda,91-00156-a0", "simple-panel"; */
compatible = "innolux,g070y2-l01", "simple-panel";
backlight = <&backlight>;
power-supply = <&panel_reg>;
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
port@0 {
reg = <0>;
#address-cells = <1>;
#size-cells = <0>;
panel_input: endpoint@0 {
reg = <0>;
remote-endpoint = <&hlcdc_panel_output>;
};
};
};
panel_reg: panel_regulator {
compatible = "regulator-fixed";
regulator-name = "panel-power-supply";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
status = "okay";
};
i2c0: i2c@f8028000 {
dmas = <0>, <0>;
pinctrl-names = "default","gpio";
pinctrl-0 = <&pinctrl_i2c0_default>;
pinctrl-1 = <&pinctrl_i2c0_gpio>;
i2c-analog-filter;
i2c-digital-filter;
i2c-digital-filter-width-ns = <35>;
sda-gpios = <&pioA PIN_PD21 GPIO_ACTIVE_HIGH>;
scl-gpios = <&pioA PIN_PD22 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
status = "disabled";
gt9271: gt9271@5d {
compatible = "goodix,gt9271";
reg = <0x5D>;
interrupt-parent = <&pioA>;
interrupts = <PIN_PC7 IRQ_TYPE_LEVEL_LOW>;
};
};
Device tree - pinctrl@fc038000 section
pinctrl_lcd_base: pinctrl_lcd_base {
pinmux = <PIN_PC30__LCDVSYNC>,
<PIN_PC31__LCDHSYNC>,
<PIN_PD1__LCDDEN>,
<PIN_PD0__LCDPCK>;
bias-disable;
/* atmel,drive-strength = <ATMEL_PIO_DRVSTR_ME>; */
};
pinctrl_lcd_rgb666: pinctrl_lcd_rgb666 {
pinmux = <PIN_PC10__LCDDAT2>,
<PIN_PC11__LCDDAT3>,
<PIN_PC12__LCDDAT4>,
<PIN_PC13__LCDDAT5>,
<PIN_PC14__LCDDAT6>,
<PIN_PC15__LCDDAT7>,
<PIN_PC16__LCDDAT10>,
<PIN_PC17__LCDDAT11>,
<PIN_PC18__LCDDAT12>,
<PIN_PC19__LCDDAT13>,
<PIN_PC20__LCDDAT14>,
<PIN_PC21__LCDDAT15>,
<PIN_PC22__LCDDAT18>,
<PIN_PC23__LCDDAT19>,
<PIN_PC24__LCDDAT20>,
<PIN_PC25__LCDDAT21>,
<PIN_PC26__LCDDAT22>,
<PIN_PC27__LCDDAT23>;
bias-disable;
};
pinctrl_lcd_pwm: pinctrl_lcd_pwm {
pinmux = <PIN_PC28__LCDPWM>;
bias-disable;
};
Datasheet
Device tree
Working example of dts
Links
Related products
- CPU Microchip SAMA5D27
- Cortex A5 @ 500 MHz
- Very low power consumption:
396mW in full speed mode
198mW at Linux prompt
17mW in standby mode
10mW in suspend to RAM mode - Armhf architecture
- DDR3L RAM 256 MB
- QuadSPI 0/16/64/128MB
- Size: 40x30 mm
- Plug-in module
- 200 pins 0.4 mm pitch
- TFT parallel interface
- Boot from internal Quad SPI or external uSD/eMMC
- Linux Kernel 5.15 LTS
- Debian, Buildroot and Yocto
- Open source drivers
