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QT适配

运行qt程序，需要很多相应的动态库，下面讲解如何在buildroot工具里编译QT动态库，并成功编译一个qtdemo。

1.搭建QT开发环境​

在Ubuntu上，进入SDK根目录t113i_tinasdk5.0-v1，

前面开发环境搭建章节已经搭建好了开发环境，先执行 source build/envsetup.sh，再执行./build.sh buildroot_menuconfig 进入buildroot配置界面。

找到Target packages，进入。

image-20240730103356980

找到Graphic libraries and applications，进入。

image-20240730103449997

找到QT5，点击键盘y，并进入。

image-20240730103526051

点击键盘y，选上以下选项。

image-20240730103743271

image-20240730103947554

image-20240730104020154

注意：先不要编译例程，因为目前交叉编译工具链中还没有相应的库文件，编译例程会出现错误。要把以上的库文件先编译。

保存退出。

执行./build.sh，编译程序。编译完成后，交叉编译工具链中自动会有相对应的库文件，这样就可以去编译qt应用程序了。

如果前面误操作选上了例程，编译时会出现报错（即便把例程取消再编译），

需要到t113i_tinasdk5.0-v1/out/t113_i/evb1_auto/buildroot/buildroot/build目录下，把相应的库文件和例程文件删除，再重新编译。

2.编译及运行QT应用程序​

上面搭建好环境之后，就可以选择编译qt例程了。

进入SDK根目录t113i_tinasdk5.0-v1，

执行./build.sh buildroot_menuconfig，进入buildroot配置界面。

找到Target packages，进入。

image-20240730105942803

找到 allwinner platform private package select，进入。

image-20240730110022974

找到qt_demo，进入。

image-20240730110052980

点击键盘y，选上以下选项。

image-20240730110136442

保存退出。

执行./build.sh编译程序。

SDK中已为qt-demo编写了一份开机自启动的脚本，

脚本保存在t113i_tinasdk5.0-v1/buildroot/config/buildroot/allwinner/system/busybox-init-base-files/etc/init.d/S70launcher

ubuntu@dshanpi:~/meihao/t113i_tinasdk5.0-v1/buildroot/config/buildroot/allwinner/system/busybox-init-base-files/etc/init.d$ pwd
/home/ubuntu/meihao/t113i_tinasdk5.0-v1/buildroot/config/buildroot/allwinner/system/busybox-init-base-files/etc/init.d
ubuntu@dshanpi:~/meihao/t113i_tinasdk5.0-v1/buildroot/config/buildroot/allwinner/system/busybox-init-base-files/etc/init.d$ ls
S20mdev  S50adb_start  S50powerkey_display  S50powerkey_suspend  S60mount_udisk  S70launcher
ubuntu@dshanpi:~/meihao/t113i_tinasdk5.0-v1/buildroot/config/buildroot/allwinner/system/busybox-init-base-files/etc/init.d$

image-20240730111009494

可以在该脚本S70launcher中修改或者配置显示设备节点和触摸设备节点。

#!/bin/sh
#
# Start the launcher
#

case "$1" in
    start)
                if [ ! -f "/usr/bin/Launcher" ];then
                        exit 1
                fi

                if [ -d "/usr/local/Qt_5.12.5" ];then
                        export  QTDIR=/usr/local/Qt_5.12.5
                else
                        export  QTDIR=/usr/lib
                fi

                if [ -d $QTDIR ];then

                        export  QT_ROOT=$QTDIR
                        export  PATH=$QTDIR/bin:$PATH
                        export  LD_LIBRARY_PATH=$QTDIR/lib:/usr/lib/cedarx/:$LD_LIBRARY_PATH

                        export QT_QPA_PLATFORM_PLUGIN_PATH=$QT_ROOT/plugins
                        export QT_QPA_PLATFORM=linuxfb:tty=/dev/fb0
                        export QT_QPA_FONTDIR=$QT_ROOT/fonts

                        TouchDevice=fts_ts
                        for InputDevices in /sys/class/input/input*
                        do
                                DeviceName=`cat $InputDevices/name`
                                if [ "$DeviceName" == "$TouchDevice" ];then
                                        TouchDeviceNum=${InputDevices##*input}
                                        export QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event$TouchDeviceNum
                                        echo "add "/dev/input/event$TouchDeviceNum "to Qt Application."
                                        break
                                fi
                        done
                        if [ ! -n "$TouchDeviceNum" ]; then
                                echo "Error:Input device $TouchDevice can not be found,plz check it!"
                        fi

                        if [ -d "/usr/local/Qt_5.12.5" ];then
                                export QT_QPA_PLATFORM=eglfs
                                export QT_QPA_GENERIC_PLUGINS=evdevtouch
                                export QT_QPA_EGLFS_INTEGRATION=eglfs_mali
                        else
                                export QT_QPA_FONTDIR=/usr/lib/fonts
                                export QT_QPA_GENERIC_PLUGINS=tslib
                                #export QT_QPA_GENERIC_PLUGINS=evdevmouse:/dev/input/event4
                                export TSLIB_FBDEVICE=/dev/fb0
                                export TSLIB_CONSOLEDEVICE=none
                                export TSLIB_TSDEVICE=/dev/input/event3
                                export TSLIB_CONFFILE=/etc/ts.conf
                                export TSLIB_CALIBFILE=/etc/pointercal
                                export TSLIB_PLUGINDIR=/usr/lib/ts
                        fi

                        export QWS_MOUSE_PROTO=
                        mkdir -p /dev/shm
                        ulimit -c unlimited
                        Launcher &
                fi
        ;;
    stop)]
        ;;
    *)
        echo "Usage: $0 {start}"
        exit 1
        ;;
esac

exit 0

修改完成后，回到SDK根目录t113i_tinasdk5.0-v1

执行./build.sh编译程序。

注意：要确保 t113i_tinasdk5.0-v1/out/t113_i/evb1_auto/buildroot/buildroot/build/busybox-init-base-files/etc/init.d 目录下的 S70launcher 脚本文件与上面的修改的相对应，否则需要删除 busybox-init-base-files 文件，再重新编译。

编译成功后，执行./build.sh pack进行打包。烧录到开发板上。

...
Starting adb: [    7.930514] file system registered
OK
init adb main[    7.981491] read descriptors

Handling main()
[    7.985095] read strings
Initializing postgresql data base...
su: unknown user postgres
done
Starting postgresql: su: unknown user postgres
OK
/etc/init.d/S50powerkey_display: line 12: powerkey_display: command not found
/etc/init.d/S50powerkey_suspend: line 12: powerkey_suspend: command not found
[    8.130511] FAT-fs (mmcblk0p8): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
/dev/by-name/UDISK already forma[    8.144528] sunxi_set_cur_vol_work()422 WARN: get power supply failed
t
[    8.187954] FAT-fs (mmcblk0p8): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[    8.230945] android_work: sent uevent USB_STATE=CONNECTED
add /dev/input/event3 to Qt Application.
Starting dnsmasq: [    8.324039] configfs-gadget gadget: high-speed config #1: c
[    8.330520] android_work: sent uevent USB_STATE=CONFIGURED
[    8.484259] urandom_read: 2 callbacks suppressed
[    8.484270] random: dnsmasq: uninitialized urandom read (128 bytes read)
OK
Trying to connect to SWUpdate...
swu_param: ####
swu_software: ####
swu_mode: ####
no swupdate_cmd to run, wait for next swupdate
# [   14.056782] random: crng init done
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
xkbcommon: ERROR: failed to add default include path /usr/share/X11/xkb
Failed to create xkb context
load filemanager_zh ok;
load qt_zh_CN ok;
load qfile_zh ok;
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
#

可以看到qt-demo已经在后台中运行。

image-20240730112210544

完整的界面并不是这样，需要修改相应的分辨率适配mipi屏幕。