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boards: nxp: frdm_mcxn947: migrate ov7670 to a shield
The OV7670 was defined as part of the FRDM-MCXN947 board attached to the SmartDMA and I2C peripheral. Migrate the devicetree to a reusable shield that can be swapped with other image sensors. Signed-off-by: Josuah Demangeon <me@josuah.net>
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‎boards/nxp/frdm_mcxn947/frdm_mcxn947.dtsi

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#include "frdm_mcxn947-pinctrl.dtsi"
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#include <zephyr/dt-bindings/i2c/i2c.h>
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#include <zephyr/dt-bindings/input/input-event-codes.h>
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#include <zephyr/dt-bindings/gpio/dvp-20pin-connector.h>
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/ {
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aliases{
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<10 0 &gpio4 5 0>, /* Pin 10, LCD backlight control */
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<11 0 &gpio4 7 0>; /* Pin 11, LCD and touch reset */
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};
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dvp_20pin_gpio: dvp-20pin-connector {
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compatible = "arducam,dvp-20pin-connector";
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#gpio-cells = <2>;
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gpio-map-mask = <DVP_20PIN_MASK 0x0>;
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gpio-map-pass-thru = <0x0 GPIO_DT_FLAGS_MASK>;
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gpio-map = <DVP_20PIN_PEN 0 &gpio1 19 0>,
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<DVP_20PIN_PDN 0 &gpio1 18 0>;
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};
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};
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&flexcomm1_lpspi1 {
@@ -91,29 +101,17 @@ nxp_8080_touch_panel_i2c: &flexcomm2_lpi2c2 {
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pinctrl-names = "default";
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};
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&flexcomm7_lpi2c7 {
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dvp_20pin_i2c: &flexcomm7_lpi2c7 {
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pinctrl-0 = <&pinmux_flexcomm7_lpi2c>;
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pinctrl-names = "default";
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clock-frequency = <I2C_BITRATE_STANDARD>;
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ov7670: ov7670@21 {
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compatible = "ovti,ov7670";
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reset-gpios = <&gpio1 19 GPIO_ACTIVE_HIGH>;
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pwdn-gpios = <&gpio1 18 GPIO_ACTIVE_HIGH>;
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reg = <0x21>;
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port {
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ov7670_ep_out: endpoint {
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remote-endpoint-label = "sdma_ep_in";
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};
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};
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};
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};
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/* SmartDMA is used for video driver on this board */
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&smartdma {
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status = "okay";
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program-mem = <0x4000000>;
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video_sdma: video-sdma {
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dvp_20pin_interface: video_sdma: video-sdma {
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status = "okay";
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compatible = "nxp,video-smartdma";
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pinctrl-0 = <&pinmux_smartdma_camera>;
@@ -123,8 +121,7 @@ nxp_8080_touch_panel_i2c: &flexcomm2_lpi2c2 {
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pclk-pin = <5>;
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port {
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sdma_ep_in: endpoint {
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remote-endpoint-label = "ov7670_ep_out";
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dvp_20pin_ep_in: endpoint {
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};
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};
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};

‎boards/shields/dvp_20pin_ov7670/Kconfig.shield

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# Copyright 2025 tinyVision.ai Inc.
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# SPDX-License-Identifier: Apache-2.0
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config SHIELD_DVP_20PIN_OV7670
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def_bool $(shields_list_contains,SHIELD_DVP_20PIN_OV7670)

‎boards/shields/dvp_20pin_ov7670/doc/index.rst

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.. _dvp_20pin_ov7670:
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DVP 20-pin OV7670 Camera Module
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###############################
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Overview
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********
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This series of shields supports the camera modules which use a 18-pin connector compatible with
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the ``arducam,dvp-20pin-connector`` to connect a devkit to an OV7670 image sensor via DVP
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(Digital Video Port), aka parallel interface.
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Only 18 pins out of the 20-pin connector are present
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It was originally produced by `Arducam`_ but is discontinuited, and now `Olimex`_ provides it.
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Pins assignment
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===============
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+-----+--------------+-----+--------------+
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| Pin | Function | Pin | Function |
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+=====+==============+=====+==============+
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| 1 | 3V3 | 2 | GND |
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+-----+--------------+-----+--------------+
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| 3 | SCL | 4 | SDA |
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+-----+--------------+-----+--------------+
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| 5 | VS | 6 | HS |
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+-----+--------------+-----+--------------+
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| 7 | PCLK | 8 | XCLK |
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+-----+--------------+-----+--------------+
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| 9 | D7 | 10 | D6 |
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+-----+--------------+-----+--------------+
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| 11 | D5 | 12 | D4 |
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+-----+--------------+-----+--------------+
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| 13 | D3 | 14 | D2 |
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+-----+--------------+-----+--------------+
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| 15 | D1 | 16 | D0 |
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+-----+--------------+-----+--------------+
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| 17 | POWER_EN | 18 | POWER_DOWN |
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+-----+--------------+-----+--------------+
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Requirements
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************
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This shield can be used with any board which provides a 18 or 20-pin header spread over two rows
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of 9 or 10 pins each with the above pinout, such as the `arduino Giga R1`_, `NXP FRDM-MCXN947`_,
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ST boards with the `ST-CAMS-OMV`_ adapter, or any other board with a compatible connector.
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Alternatively, it is possible to use jumper wires to connect the module to any devkit that
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exposes their camera parallel port to pin headers.
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Programming
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***********
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Set ``--shield dvp_20pin_ov7670`` when you invoke ``west build``. For example:
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.. zephyr-app-commands::
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:zephyr-app: samples/drivers/video/capture
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:board: frdm_mcxn947
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:shield: dvp_20pin_ov7670
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:goals: build
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References
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**********
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.. target-notes::
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.. _ST-CAMS-OMV:
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https://www.st.com/en/evaluation-tools/b-cams-omv.html
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.. _Arducam:
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https://docs.arducam.com/DVP-Camera-Module/Arduino-GIGA/Arduino-GIGA/Quick-Start-Guide/
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.. _Arduino Giga R1:
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https://docs.arduino.cc/tutorials/giga-r1-wifi/giga-camera/
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.. _NXP FRDM-MCXN947:
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https://www.nxp.com/docs/en/application-note/AN14191.pdf
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.. _Olimex:
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https://www.olimex.com/Products/Components/Camera/CAMERA-OV7670/

‎boards/shields/dvp_20pin_ov7670/dvp_20pin_ov7670.overlay

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/*
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* Copyright 2024 NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/{
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chosen {
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zephyr,camera = &dvp_20pin_interface;
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};
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};
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&dvp_20pin_i2c {
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ov7670: ov7670@21 {
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compatible = "ovti,ov7670";
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reset-gpios = <&dvp_20pin_gpio DVP_20PIN_PEN GPIO_ACTIVE_HIGH>;
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pwdn-gpios = <&dvp_20pin_gpio DVP_20PIN_PDN GPIO_ACTIVE_HIGH>;
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reg = <0x21>;
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port {
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dvp_20pin_ep_out: endpoint {
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remote-endpoint-label = "dvp_20pin_ep_in";
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};
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};
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};
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};
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&dvp_20pin_ep_in {
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remote-endpoint-label = "dvp_20pin_ep_out";
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};
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&dvp_20pin_interface {
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status = "okay";
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};

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