PICO-IMX8M-MINI TEVS Camera Usage Guide
- 02 May 2024
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PICO-IMX8M-MINI TEVS Camera Usage Guide
- Updated on 02 May 2024
- 2 Minutes to read
- Print
- DarkLight
- PDF
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Introduction
This article guides you how to get started using TEVS Series camera on PICO-IMX8M-MINI.
Background knowledge needed
You must have the background knowledge to modify the kernel configuration, rebuild, and replace the kernel and the device tree source (DTS)
Supported Camera Modules
| Camera Series | Products |
|---|---|
| TEVS | TEVS-AR0144-C TEVS-AR0234-C TEVS-AR0521-C TEVS-AR0522-C TEVS-AR0522-M TEVS-AR0821-C TEVS-AR1335-C |
TEVI-OV5640 and TEVI-AR Series Cameras is no longer supported from Yocto 4.2
TEVI-OV5640 and TEVI-AR Series Cameras are only supported up to Yocto 4.0. If you want to use them, you can refer to Yocto 4.0 (Kirkstone) 2024Q1 Release.
Overview
- Connect debug console, power, and camera to board
- Prepare Yocto demo image for testing TechNexion camera
- Build Yocto
- Instructions for testing camera
- Trouble shooting
Connect debug console, power and camera to board
- Prepare DC 5V power cable to plug in. (Note: PICO-PI-8M is powered by USB Type C)
- Prepare UART cable connect to debug console of PICO-PI-8M
- It's recommended to prepare a FPC cable to connect board will be more easy to use.
Prepare Yocto demo image for testing TechNexion camera
The demo image contains the required device tree blobs and camera drivers to enable TechNexion cameras.
Prebuilt demo images can be available for download via TechNexion's server.
Image Download Link:
pico-imx8mm_pico-pi-8m_yocto-4.0-qt6_qca9377_mipi5-1280x720_20230420.zip
Flash image to e.MMC
- Using 'uuu' to flash
UUU
boot mode
Ensure the boot mode is configured as serial download mode.
Boot Configurations of PICO-PI-IMX8M-MINI
- Using u-boot's 'ums' Command to Write Flash Storage over USB-OTG
UMS
u-boot
The board must also boot from either e.MMC with a version of U-boot that has the ums command enabled.
Please refer to Instructions for testing camera section for camera testing steps.
Build Yocto
Supported TechNexion Linux kernel branch for TEVI camera modules
| Linux | branch |
|---|---|
| 6.1.55 | tn-imx_6.1.55_2.2.0-next |
Fetch Yocto source
Build Yocto
Instructions for testing camera
Specify camera DTBO in u-boot
Connect debug console cable to PICO-PI-IMX8M-MINI.
Power on board , and enter u-boot prompt.
Specify camera dtb via 'dtoverlay' u-boot environment variable
u-boot=> setenv dtoverlay tevs
- Continue boot process.
u-boot=> saveenv
u-boot=> boot
Start camera video stream via gstreamer
Specify the capture device you just get and start gstreamer to get video stream on screen :
$ gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw, width=<res_w>,height=<res_h> ! imxvideoconvert_g2d ! waylandsink window-width=<x> window-height=<y> sync=false
imxvideoconvert_g2d
It must have to use or using videoconvert . Because IMX8MM doesn't have ISI to convert format
Trouble shooting
Ensure camera device tree blob overlay(DTBO) is specified correctly in u-boot.
u-boot=> printenv dtoverlay
dtoverlay=tevs
We can check whether camera have been initialized correcly.
$ dmesg -t | grep tevs
tevs 1-0048: tevs_probe() device node: tevs@48
tevs 1-0048: Version:24.1.1.3
tevs 1-0048: Product:TEVS-AR0234, HeaderVer:3, MIPI_Rate:800
tevs 1-0048: probe success
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