NHD-2.4-240320CF-BSXV-F and MIPI

Lilian Buisson de Larichaudy

• June 10, 2026 15:38

Hello, I need ton know how can I found parameters for my overlay in nrf connect like vcom gctrl lcm etc and know how I should structure the overlay because I created this and the build don't find the display, Iput :

CS in p1.12,

DC in 1.11,

Sclk in P1.15

Miso in P1.14

Mosi in P1.13

Led PWM in P1.09 

I don't know how it work. 

Here is my overlay: 

/ {

    chosen {

        zephyr,display = &st7789;

    };

};

 

&spi1 {

    status = "okay";

    cs-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;

    pinctrl-0 = <&spi1_default>;

    pinctrl-names = "default";

};

 

&pinctrl {

    spi1_default: spi1_default {

        group1 {

            psels = <

                NRF_PSEL(SPIM_SCK,  1, 15)

                NRF_PSEL(SPIM_MOSI, 1, 13)

                NRF_PSEL(SPIM_MISO, 1, 14)

            >;

        };

    };

    pwm0_default: pwm0_default {

        group1 {

            psels = <

                NRF_PSEL(PWM_OUT0, 1, 9)   /* PWM0_CH0 → P1.09 */

            >;

        };

    };

};

/* PWM backlight on P1.09 */

&pwm0 {

    status = "okay";

    pinctrl-0 = <&pwm0_default>;

    pinctrl-names = "default";

};

&{/} {

    backlight_pwm: backlight_pwm {

        compatible = "pwm-leds";

        led_pwm {

            pwms = <&pwm0 0 PWM_MSEC(1) PWM_POLARITY_NORMAL>;

        };

    };

};

/* Driver ST7789V with SPI1 */

mipi_dbi {

    compatible = "zephyr,mipi-dbi-spi";

    status = "okay";

    reset-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>;   /* RESET = P1.10 */

    dc-gpios    = <&gpio1 11 GPIO_ACTIVE_HIGH>;  /* DC = P1.11 */

    spi-dev = <&spi1>;

    #address-cells = <1>;

    #size-cells = <0>;

    st7789: st7789v@0 {

        compatible = "sitronix,st7789v";

        status = "okay";

        reg = <0>;

        mipi-mode = "MIPI_DBI_MODE_SPI_4WIRE";

        mipi-max-frequency = <20000000>;

        width = <320>;

        height = <240>;

        x-offset = <0>;

        y-offset = <0>;

        /*MIP parameters, maybe wrong values*/

        vcom = <0x28>;

        gctrl = <0x35>;

        lcm = <0x2C>;

        colmod = <0x65>;

        mdac = <0xA8>;

        gamma = <0x01>;

        porch-param = [0C 0C 00 33 33];

        cmd2en-param = [5A 69 02 00];

        pwctrl1-param = [A4 A1];

        pvgam-param = [d0 00 02 07 05 18 25 44 42 06 0e 12 14 17];

        nvgam-param = [d0 00 02 07 05 18 25 54 47 0e 1c 17 1b 1e];

        ram-param = [00 F0];

        rgb-param = [00 02 14];

        inversion-off;

    };

};

 

Thank you for your reading

0

• 

  Lilian Buisson de Larichaudy

  • June 10, 2026 15:40

  note : Im1 is on Vdd and Im0 on gnd so it's in 4 wire 8 bits mode

  0
• 

  Engineering Support

  Community moderator

  • June 12, 2026 22:07

  Hi,

  Thank you for your inquiry. Please note that our NHD-2.4-240320CF-BSXV-F display supports only 3/4-wire SPI interfaces.

  Could you please clarify what you are trying to achieve and which development board you are using to communicate with the display?

  0
• 

  Lilian Buisson de Larichaudy

  • July 07, 2026 08:02

  I want to display messages on the screen using Lvgl library, my Nordic nRF5340 DK and the Zephyr RTOS. In the Zephyr driver folder, the only driver available for the ST7789V uses the MIPI‑DBI interface. So I tried to find the parameters that could match my display. That’s why I’m looking for values such as vcom, gctrl, lcm, etc., and how I should structure the overlay, because I created one but the build system doesn’t detect the display.

  0
• 

  Lilian Buisson de Larichaudy

  • July 07, 2026 08:04

  Concerning the screen on the overlay, i activated spi1 and the backlight pwm with pwm0.

  0
• 

  Engineering Support

  Community moderator

  • July 08, 2026 20:51

  Hello Lilian, 

  As the NHD-2.4-240320CF-BSXV-F display does not support MIPI interface and only supports 3/4-wire SPI interfaces.

  I will recommend you to look at our example code NHD-2.4-240320CF-BSXV-F - with Arduino  to start with.

  If you are looking for a library to work with, the Adafruit GFX library is also widely used and worth exploring.

   

  0

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