This version (27 Jul 2020 09:17) was approved by cathy fang.The Previously approved version (27 Jul 2020 08:28) is available.
Table of Contents
USB Camera Support
Hardware Configuration
Connect the USB micro-A plug to A receptacle adapter cable (found in the EZ-Board box) to the OTG port, below photo shows when it acts as Host and connected to a USB Camera device.
Software Configuration
On the Yocto, Configure the linux-kernel as below to set the USB controller in Host only mode, and enable the USB Camera relevant supported operations. Check the directory of “yocto/build” and Clean up and setup the linux-kernel configuration with commands:
$ bitbake linux-adi -c cleansstate $ bitbake linux-adi -c menuconfig
And In the pop-up window of linux-kenel configuration, configure as follows Configure the USB drivers to host mod or (dual role mode)
Device Drivers --->
[*] USB support --->
<*> Support for Host-side USB
[*] Enable USB persist by default
<*> Inventra Highspeed Dual Role Controller
MUSB Mode Selection (Dual role mode) --->
*** Platform Glue Layer ***
<*> ADI
*** MUSB DMA mode ***
[N] Disable DMA (always use PIO)
[*] Inventra
Configure the USB camera corresponding options
Device Drivers --->
<*> Multimedia support --->
*** Multimedia core support ***
[*] Cameras/video grabbers support
[*] Media Controller API
[*] V4L2 sub-device userspace API
*** Media drivers ***
[*] Media USB Adapters --->
<*> USB Video Class (UVC)
[*] UVC input events device support
<M> GSPCA based webcams (NEW) --->
<M> USB Philips Cameras
[*] Autoselect ancillary drivers (tuners, sensors, i2c, spi, frontends) (NEW)
Enable the I2C
Device Drivers --->
I2C support --->
[*] Enable compatibility bits for old user-space
<*> I2C device interface
[*] Autoselect pertinent helper modules
I2C Hardware Bus support --->
<*> ADI TWI I2C support
(50) ADI TWI I2C clock (kHz)
Include the USB gadget zero module
Device Drivers --->
[*] USB support --->
<*> USB Gadget Support --->
<M> USB Gadget precomposed configurations
<M> Gadget Zero (DEVELOPMENT)
Then save the linux-kernel configuration and build the target images:
$ bitbake adsp-sc5xx-full
Example Usage
Boot the generated Images and connect the USB Camera, kernel outputs messages looks like below:
root@adsp-sc589-ezkit:~# modprobe g_zero zero gadget: Gadget Zero, version: Cinco de Mayo 2008 zero gadget: zero ready root@adsp-sc589-ezkit:~# usb 1-1: new high-speed USB device number 2 using musb-hdrc uvcvideo: Found UVC 1.00 device <unnamed> (046d:0990) uvcvideo 1-1:1.0: Entity type for entity Extension 4 was not initialized! uvcvideo 1-1:1.0: Entity type for entity Extension 10 was not initialized! uvcvideo 1-1:1.0: Entity type for entity Extension 12 was not initialized! uvcvideo 1-1:1.0: Entity type for entity Extension 8 was not initialized! uvcvideo 1-1:1.0: Entity type for entity Extension 11 was not initialized! uvcvideo 1-1:1.0: Entity type for entity Extension 9 was not initialized! uvcvideo 1-1:1.0: Entity type for entity Processing 2 was not initialized! uvcvideo 1-1:1.0: Entity type for entity Extension 13 was not initialized! uvcvideo 1-1:1.0: Entity type for entity Camera 1 was not initialized! input: UVC Camera (046d:0990) as /devices/platform/scb/310c1000.usb/musb-hdrc.1.auto/usb1/1-1/1-1:1.0/input/input0 root@adsp-sc589-ezkit:~# modprobe uvcvideo root@adsp-sc589-ezkit:~# ffmpeg -f video4linux2 -r 5 -s 320x240 -i /dev/video0 -vcodec mpeg4 -f mp4 usb_camera.mp4 ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 8.2.0 (GCC) configuration: --disable-stripping --enable-pic --enable-shared --enable-pthreads --disable-libxcb --disable-libxcb-shm --v libavutil 56. 14.100 / 56. 14.100 libavcodec 58. 18.100 / 58. 18.100 libavformat 58. 12.100 / 58. 12.100 libavdevice 58. 3.100 / 58. 3.100 libavfilter 7. 16.100 / 7. 16.100 libswscale 5. 1.100 / 5. 1.100 libswresample 3. 1.100 / 3. 1.100 libpostproc 55. 1.100 / 55. 1.100 Input #0, video4linux2,v4l2, from '/dev/video0': Duration: N/A, start: 137.819364, bitrate: 6144 kb/s Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 320x240, 6144 kb/s, 5 fps, 5 tbr, 1000k tbn, 1000k tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native)) Press [q] to stop, [?] for help (Enter q to save your recored) Output #0, mp4, to 'usb_camera.mp4': Metadata: encoder : Lavf58.12.100 Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 320x240, q=2-31, 200 kb/s, 5 fps, 10240 tbn, 5 tbc Metadata: encoder : Lavc58.18.100 mpeg4 Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1 frame= 1029 fps=5.0 q=2.0 Lsize= 947kB time=00:03:25.60 bitrate= 37.7kbits/s speed= 1x video:942kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.551482% root@adsp-sc589-ezkit:~# ls (To make sure whether the mp4 file is exisited) usb_camera.mp4 root@adsp-sc589-ezkit:~# scp usb_camera.mp4 test@10.100.4.174:/home/test(Copy the mp4 file from board to host PC) The authenticity of host '10.100.4.174 (10.100.4.174)' can't be established. ECDSA key fingerprint is c1:23:ab:ea:cf:bc:88:20:9b:ac:1f:54:51:30:81:f8. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '10.100.4.174' (ECDSA) to the list of known hosts. test@10.100.4.174's password: usb_camera.mp4 100% 1108KB 1.1MB/s 00:00
Play the usb_camera.mp4 on the host PC
$ ffplay usb_camera.mp4
If the recored could play successfully then the test can pass, if you could not play the video using ffplay command, you could double click the video and then play.
Go TO USB Interface
resources/tools-software/linuxdsp/docs/linux-kernel-and-drivers/usb/host_mode/usb_camera.txt · Last modified: 27 Jul 2020 09:00 by cathy fang