zephyr

History

Alain Volmat 706895cc27 samples: video: capture_to_lvgl: add crop/compose support Demonstrate the crop/compose API by introducing 4 new CONFIG options in order to define the crop area. Moreover, if the selection API is available and if the targetted size is different from the current crop size, then try to apply a compose in order to reach the targetted format size. Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>		2025-07-03 11:56:07 -05:00
..
boards	samples: video: capture_to_lvgl: add stm32n6570_dk/fsbl conf	2025-07-03 11:56:07 -05:00
src	samples: video: capture_to_lvgl: add crop/compose support	2025-07-03 11:56:07 -05:00
CMakeLists.txt
Kconfig	samples: video: capture_to_lvgl: add crop/compose support	2025-07-03 11:56:07 -05:00
prj.conf	drivers: video: sw_generator: convert to use the devicetree	2025-06-02 05:48:21 +02:00
README.rst	drivers: video: sw_generator: convert to use the devicetree	2025-06-02 05:48:21 +02:00
sample.yaml

README.rst

.. zephyr:code-sample:: video-capture-to-lvgl
   :name: Video capture to LVGL
   :relevant-api: video_interface

   Capture video frames and display them on an LCD using LVGL.

Description
***********

The application uses the :ref:`Video API <video_api>` to retrieve video frames from
a video capture device, write a frame count message to the console, and then send
the frame to an LCD display.

Requirements
************

This sample requires a supported :ref:`video capture device <video_api>` (e.g., a camera)
and a :ref:`display <display_api>`.

Wiring
******

On the `WeAct Studio STM32H743`_, connect the OV2640 camera module and the 0.96" ST7735
TFT LCD display. Connect a USB cable from a host to the micro USB-C connector on the
board to receive console output messages.

Building and Running
********************

For :zephyr:board:`mini_stm32h743`, build this sample application with the following commands:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/video/capture_to_lvgl/
   :board: mini_stm32h743
   :shield: weact_ov2640_cam_module
   :goals: build flash
   :gen-args: -DCONFIG_BOOT_DELAY=2000
   :compact:

For testing purpose and without the need of any real video capture hardware,
a video software pattern generator is supported by using :ref:`snippet-video-sw-generator`:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/video/capture
   :board: native_sim/native/64
   :snippets: video-sw-generator
   :goals: build
   :compact:

Sample Output
=============

.. code-block:: console

    [00:00:02.779,000] <inf> main: - Device name: dcmi@48020000
    [00:00:02.779,000] <inf> main: - Capabilities:
    [00:00:02.779,000] <inf> main:   RGBP width [160; 160; 0] height [120; 120; 0]
    [00:00:02.779,000] <inf> main:   RGBP width [176; 176; 0] height [144; 144; 0]
    [00:00:02.780,000] <inf> main:   RGBP width [240; 240; 0] height [160; 160; 0]
    [00:00:02.780,000] <inf> main:   RGBP width [320; 320; 0] height [240; 240; 0]
    [00:00:02.780,000] <inf> main:   RGBP width [352; 352; 0] height [288; 288; 0]
    [00:00:02.780,000] <inf> main:   RGBP width [640; 640; 0] height [480; 480; 0]
    [00:00:02.780,000] <inf> main:   RGBP width [800; 800; 0] height [600; 600; 0]
    [00:00:02.780,000] <inf> main:   RGBP width [1024; 1024; 0] height [768; 768; 0]
    [00:00:02.780,000] <inf> main:   RGBP width [1280; 1280; 0] height [1024; 1024; 0]
    [00:00:02.780,000] <inf> main:   RGBP width [1600; 1600; 0] height [1200; 1200; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [160; 160; 0] height [120; 120; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [176; 176; 0] height [144; 144; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [240; 240; 0] height [160; 160; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [320; 320; 0] height [240; 240; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [352; 352; 0] height [288; 288; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [640; 640; 0] height [480; 480; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [800; 800; 0] height [600; 600; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [1024; 1024; 0] height [768; 768; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [1280; 1280; 0] height [1024; 1024; 0]
    [00:00:02.780,000] <inf> main:   JPEG width [1600; 1600; 0] height [1200; 1200; 0]
    [00:00:02.852,000] <inf> main: - Format: RGBP 160x120 320
    [00:00:02.854,000] <inf> main: - Capture started

References
**********

.. target-notes::

.. _WeAct Studio STM32H743: https://github.com/WeActStudio/MiniSTM32H7xx