weston fbdev-backend by VNC server === ### 本文 由於wayvnc不支援太舊的weston版本? ![](https://i.imgur.com/hnMOf9y.png) 本文章使用framebuffer backend實作遠端桌面(remote Desktop) 使用的wayland compositor: >weston 5.0.0 >需要/usr/lib/libweston-5/fbdev-backend.so library : >libvncserver >framebuffer-vncserver 先透過強行啟動HDMI裝置分配framebuffer，再使用fbdev-backend 將螢幕繪製到framebuffer。 然後使用uinput創造出虛擬的鍵盤滑鼠供fbdev-backend和framebuffer-vncserver使用。 最後只要用VNC Viewer就能連上畫面了 ### uboot >uboot => >>setenv video \'video=HDMI-A-1:1024x768:60\' >> >>saveenv >> >>boot ### libvncserver 1. Download >git clone https://github.com/LibVNC/libvncserver.git 2. set cross compiler env >source /opt/fsl-imx-wayland/4.14-sumo/environment-setup-aarch64-poky-linux 3. install >cmake CMakeList.txt > >make DESTDIR=your_dest install ### framebuffer-vncserver 1. Download >git clone https://github.com/ponty/framebuffer-vncserver.git 2. set cross compiler env > source /opt/fsl-imx-wayland/4.14-sumo/environment-setup-aarch64-poky-linux 3. 修改src/touch.c 由於weston的觸發使用滑鼠左鍵，修改BTN_TOUCH > BTN_LEFT 第205行: ```javascript=200 // Then send a BTN_TOUCH gettimeofday(&time, 0); ev.input_event_sec = time.tv_sec; ev.input_event_usec = time.tv_usec; ev.type = EV_KEY; ev.code = BTN_TOUCH; => ev.code = BTN_LEFT; ev.value = touchValue; ``` 3. Install >cmake CMakeList.txt >make DESTDIR=your_dest install ※ Dependency: >libvncserver ### uinput 使用uinput創出虛擬的滑鼠和鍵盤(/dev/input/event*) 程式碼如下 ```javascript= #include <linux/uinput.h> #include <stdlib.h> #include <stdio.h> #include <stdint.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> using namespace std; void mouse_move(int fd, int dx, int dy) { struct input_event ev; memset(&ev, 0, sizeof(struct input_event)); ev.type = EV_ABS; ev.code = ABS_X; ev.value = dx; if (write(fd, &ev, sizeof(struct input_event)) < 0) { printf("move error\n"); } memset(&ev, 0, sizeof(struct input_event)); ev.type = EV_ABS; ev.code = ABS_Y; ev.value = dy; if (write(fd, &ev, sizeof(struct input_event)) < 0) { printf("move error\n"); } memset(&ev, 0, sizeof(struct input_event)); ev.type = EV_SYN; ev.code = SYN_REPORT; ev.value = 0; if (write(fd, &ev, sizeof(struct input_event)) < 0) { printf("move error\n"); } } void mouse_report_key(int fd, uint16_t type, uint16_t keycode, int32_t value) { struct input_event ev; memset(&ev, 0, sizeof(struct input_event)); ev.type = type; ev.code = keycode; ev.value = value; if (write(fd, &ev, sizeof(struct input_event)) < 0) { printf("key report error\n"); }else{ printf("refrush,%d,%d,%d\n",type,keycode,value); } } int main(void) { struct uinput_user_dev mouse,key; int fd,fd2, ret ,version; int dx, dy; fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK); fd2 = open("/dev/uinput", O_WRONLY | O_NONBLOCK); if (fd < 0 && fd2 < 0) { return fd; } //key ioctl(fd2, UI_SET_EVBIT, EV_KEY); for(int i=0;i<=120;i++) ioctl(fd2, UI_SET_KEYBIT, i); //ioctl(fd2, UI_SET_KEYBIT, 133); memset(&key, 0, sizeof(struct uinput_user_dev)); snprintf(key.name, UINPUT_MAX_NAME_SIZE, "key"); key.id.bustype = BUS_USB; key.id.vendor = 0x1234; key.id.product = 0x5679; key.id.version = 1; ret = write(fd2, &key, sizeof(struct uinput_user_dev)); ioctl(fd2, UI_DEV_SETUP, &key); ret = ioctl(fd2, UI_DEV_CREATE); if (ret < 0) { close(fd2); return ret; } //mouse ioctl(fd, UI_SET_EVBIT, EV_SYN); ioctl(fd, UI_SET_EVBIT, EV_KEY); ioctl(fd, UI_SET_KEYBIT, BTN_TOUCH); ioctl(fd, UI_SET_KEYBIT, BTN_MOUSE); ioctl(fd, UI_SET_KEYBIT, BTN_LEFT); ioctl(fd, UI_SET_KEYBIT, BTN_RIGHT); ioctl(fd, UI_SET_KEYBIT, BTN_MIDDLE); ioctl(fd, UI_SET_EVBIT, EV_REL); // ioctl(fd, UI_SET_RELBIT, REL_X); // ioctl(fd, UI_SET_RELBIT, REL_Y); ioctl(fd, UI_SET_EVBIT, EV_ABS); ioctl(fd, UI_SET_ABSBIT, ABS_X); ioctl(fd, UI_SET_ABSBIT, ABS_Y); // ioctl(fd, UI_SET_ABSBIT, ABS_PRESSURE); // ioctl(fd, UI_SET_ABSBIT, ABS_MT_POSITION_X); // ioctl(fd, UI_SET_ABSBIT, ABS_MT_POSITION_Y); memset(&mouse, 0, sizeof(struct uinput_user_dev)); snprintf(mouse.name, UINPUT_MAX_NAME_SIZE, "mouse"); mouse.id.bustype = BUS_USB; mouse.id.vendor = 0x1234; mouse.id.product = 0x5678; mouse.id.version = 1; mouse.absmin[ABS_X] = 0; mouse.absmax[ABS_X] = 1023; mouse.absfuzz[ABS_X] = 0; mouse.absflat[ABS_X] = 0; mouse.absmin[ABS_Y] = 0; mouse.absmax[ABS_Y] = 600; mouse.absfuzz[ABS_Y] = 0; mouse.absflat[ABS_Y] = 0; ret = write(fd, &mouse, sizeof(struct uinput_user_dev)); ioctl(fd, UI_DEV_SETUP, &mouse); ret = ioctl(fd, UI_DEV_CREATE); if (ret < 0) { close(fd); return ret; } // sleep(1); // mouse_move(fd, 10, 10); // mouse_move(fd, 20, 20); mouse_report_key(fd, EV_KEY, BTN_RIGHT, 1); mouse_report_key(fd, EV_SYN, SYN_REPORT, 0); mouse_report_key(fd, EV_KEY, BTN_RIGHT, 0); mouse_report_key(fd, EV_SYN, SYN_REPORT, 0); dx = dy = 10; while (1) { //mouse_move(fd, dx, dy); sleep(1); } ioctl(fd, UI_DEV_DESTROY); ioctl(fd2, UI_DEV_DESTROY); close(fd); close(fd2); return 0; } ``` reference: >https://www.kernel.org/doc/html/v4.12/input/uinput.html >https://blog.csdn.net/mcgrady_tracy/article/details/28340931 ### weston 我啟動weston時的配置文件 Path:/etc/xdg/weston/weston.ini ```javascript= [core] gbm-format=argb8888 idle-time=0 backend=fbdev-backend.so require-input=true use-pixman=true [shell] background-image=/home/desktop.png size=1024x600 [libinput] enable-tap=true tap-and-drag=true nd-drag-lock=true touchscreen_calibrator=true [launcher] #path= [input-method] path=/usr/libexec/weston-keyboard [output] name=HDMI-A-1 transform=90 mode=current [screen-share] command=/usr/bin/weston --backend=fbdev-backend.so --shell=fullscreen-shell.so --no-clients-resize ``` reference: >http://manpages.ubuntu.com/manpages/focal/man5/weston.ini.5.html >※找不到5.0.0版本的weston.ini說明 ### environment 1.啟動framebuffer裝置(/dev/fb0) 為了產生framebuffer 在開機的時候不使用實體HDMI，強制啟動HDMI設備 在開機檔案 /etc/rc.local 中加上: >echo on > /sys/devices/platform/display-subsystem/drm/card0/card0-HDMI-A-1/status ※ reference: >https://markyzq.gitbooks.io/rockchip_drm_integration_helper/content/zh/drm_force_enable.html 2.為了讓framebuffer-vncserver可以使用虛擬的鍵盤滑鼠(virtual keyboard and mouse)，使用uinput新增裝置(/dev/input/event*) ### 執行 啟動你的虛擬裝置 $./your_uinput 啟動weston螢幕 $weston --tty1 啟動VNCserver $framebuffer-vncserver -f /dev/fb0 -k /dev/input/event1 -t /dev/input/event2 -F 16 ##### ※-f framebuffer螢幕，-k keyboard鍵盤，-t touch滑鼠，-F fps 目前只支援到16 ##### ※裝置根據啟動weston讀取到的裝置為主 ![](https://i.imgur.com/fXdItOG.png) 最後只要使用vnc Viewer就可以連上server了![](https://i.imgur.com/nUhIXXQ.gif)