X2000 Linux UVC

news2024/11/23 15:14:01

参考文档：\doc\开发使用说明\USB使用说明文档\设备\USB_UVC\xburst2\USB_UVC.pdf

一、内核添加USB UVC功能

1、确定所用dts文件

进入到/tools/iconfigtool/IConfigToolApp/路径下，执行./IConfigTool

选择config文件，查看kernel默认配置

配置文件为x2000_module_base_linux_sfc_nand_defconfig，然后退出。

2、查看内核所用dts文件

cd kernel/kernel-x2000/
make x2000_module_base_linux_sfc_nand_defconfig
make menuconfig

目标位于

-> Machine selection
-> SOC Type Selection

所用dts文件为x2000_module_base.dts，

文件位置：\kernel\kernel-x2000\arch\mips\boot\dts\ingenic\x2000_module_base.dts

3、修改otg节点的内容

&otg {
	// g-use-dma;
	dr_mode = "otg";
	status = "okay";
};

改为

&otg {
    g-use-dma;
	dr_mode = "otg";
	status = "okay";
};

4、修改config文件

执行命令：

cd kernel/kernel-x2000/
make x2000_module_base_linux_sfc_nand_defconfig
make menuconfig

Device Drivers --->
<*> Multimedia support --->
[*] Cameras/video grabbers support

Device Drivers --->
        [*] USB support --->
                <*> USB Gadget Support --->
                <*> USB Gadget Drivers(USB functions configurable through configfs) --->
                [*] USB Webcam function

如下图所示：

保存配置文件，执行命令：

cp .config arch/mips/configs/x2000_module_base_linux_sfc_nand_defconfig

5、重新编译固件

cd 到build路径，执行命令：

make x2100_nand_defconfig
make kernel

二、编译应用

将\doc\开发使用说明\USB使用说明文档\设备路径下的USB_UVC拷贝到\demo下

进入到\demo\USB_UVC\xburst2目录，然后编译代码：

$ cd demos/USB_UVC/xburst2/
$ ../../../buildroot/buildroot/output/host/usr/bin/mips-linux-gnu-gcc uvc-camera.c uvc_lib.c -lhardware2 -o uvc-camera

编译之后会生成uvc-camera文件。

三、将应用推送到设备

adb push uvc-camera uvc-device-config.sh /usr/data

四、测试

1、关闭adb功能

/etc/init.d/S90adb stop

2、修改文件权限

# chmod 755 ./uvc-device-config.sh
# chmod 755 uvc-camera

3、配置UVC参数

# cd usr/data/
# ./uvc-device-config.sh start uvc-ch0:format=yuyv,1280,720,1000000/package_size=2048
Creating the USB gadget
Creating gadget directory uvc_demo
Setting Device Descriptor
Setting English strings
Creating Config
Creating functions...
/sys/kernel/config/usb_gadget/uvc_demo
/sys/kernel/config/usb_gadget/uvc_demo
/sys/kernel/config/usb_gadget/uvc_demo
/sys/kernel/config/usb_gadget/uvc_demo
/sys/kernel/config/usb_gadget/uvc_demo
# ls /dev/video*
/dev/video0   /dev/video1   /dev/video12  /dev/video2   /dev/video3

4、预览单路UVC摄像头，运行命令：

# ./uvc-camera /dev/vic0 video_device=/dev/video12 format=yuyv,1280,720,10 packa
ge_size=2048 io_method=mmap nbufs=3
streaming request (req 81 cs 01)
streaming request (req 01 cs 01)
setting probe control, length = 26
streaming request (req 81 cs 01)
streaming request (req 83 cs 01)
streaming request (req 82 cs 01)
streaming request (req 01 cs 01)
setting probe control, length = 26
streaming request (req 81 cs 01)
streaming request (req 01 cs 02)
setting commit control, length = 26
UVC: Buffer 0 mapped at address 0x77722000.
UVC: Buffer 1 mapped at address 0x77560000.
UVC: Buffer 2 mapped at address 0x7739e000.
UVC: 3 buffers allocated.
[  660.949174] ## VIC WARN status = 0x00000020

执行命令之后，电脑上的设备管理器，照相机下会多一个UVC Camera的相机。