[Mil NXP i.MX93 development board review] Embedded QT development

小麦克

[Mil NXP i.MX93 development board review] Embedded QT development [Copy link]

# Embedded QT tests iMX93 supports `drm`. I tested `LVGL` on IMX93 before and found that `LVGL` is not well optimized for `Linux`. Some scenes have lags. LVGL is more suitable for MCU application scenarios. After comparative research, I feel that QT is more suitable for embedded Linux UI applications. After all, QT has more powerful functions. If you are familiar with QT, QT can not only develop UI programs, but also write some complex services. ## Linux display subsystem DRM Linux DRM is a relatively new display subsystem under Linux, which is more powerful than the previous framebuffer function. Configure `buildroot` and add test programs <ignore_js_op> <img style="cursor:pointer;" id="aimg_834963" aid="834963" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202408/23/145917yt2ihl6opu0hj0u2.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202408/23/145917yt2ihl6opu0hj0u2.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_834963_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>image-20240819140613362.png</strong> <em class="xg1">(48.29 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_834963" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=834963&handlekey=savephoto_834963">save to album</a> </p> <p class="xg1 y">2024-8-23 14:59 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> View the current `drm` driver information ```bash modetest ``` <ignore_js_op> <img style="cursor:pointer;" id="aimg_834964" aid="834964" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202408/23/145958juq0udcdd2tbd8j5.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202408/23/145958juq0udcdd2tbd8j5.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_834964_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>image-20240819140829690.png</strong> <em class="xg1">(108.9 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_834964" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=834964&handlekey=savephoto_834964">save to album</a> </p> <p class="xg1 y">2024-8-23 14:59 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> Test, the display will have color stripes jitter. ```bash modetest -M imx-drm -s 35@33:720x1280 -v ``` ## Event test Touch screen touch test. From the following instructions, we can see that `/dev/input/event1` is the touch screen. Input 1 and touch the screen to see new events. ```bash # evtest No device specified, trying to scan all of /dev/input/event* Available devices: /dev/input/event0: 44440000.bbnsm:pwrkey /dev/input/event1: Goodix Capacitive TouchScreen /dev/input/event2: gpio_keys@0 /dev/input/event3: Logitech Inc. Logi USB Headset H340 Consumer Control /dev/ input/event4: Logitech Inc. Logi USB Headset H340 Select the device event number [0-4]: 1 Input driver version is 1.0.1 Input device ID: bus 0x18 vendor 0x416 product 0x38f version 0x1060 Input device name: "Goodix Capacitive TouchScreen" ``` ## QT development synchronizes the latest buildroot from github to compile QT6.7 and configure commonly used libraries. <ignore_js_op> <img style="cursor:pointer;" id="aimg_834965" aid="834965" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202408/23/150704gdmqrry7zexqxeky.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202408/23/150704gdmqrry7zexqxeky.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_834965_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>image-20240823150240141.png</strong> <em class="xg1">(144.64 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_834965" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=834965&handlekey=savephoto_834965">save to album</a> </p> <p class="xg1 y">2024-8-23 15:07 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> This is my current buildroot configuration information ```bash BR2_aarch64=y BR2_cortex_a55=y BR2_ARM_FPU_VFPV4D16=y BR2_KERNEL_HEADERS_6_1=y BR2_PACKAGE_GLIBC_UTILS=y BR2_TOOLCHAIN_BUILDROOT_CXX=y BR2_PACKAGE_HOST_GDB=y BR2_ENABLE_DEBUG=y BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y BR2_ROOTFS_MERGED_USR=y BR2_SYSTEM_DHCP="eth0" BR2_SYSTEM_DEFAULT_PATH="/bin:/sbin:/usr/bin:/usr/sbin" BR2_ENABLE_LOCALE_WHITELIST="en_US.UTF-8" BR2_GENERATE_LOCALE="en_US.UTF-8" BR2_SYSTEM_ENABLE_NLS=y BR2_TARGET_TZ_INFO=y BR2_PACKAGE_ALSA_UTILS=y BR2_PACKAGE_ALSA_UTILS_ALSACONF=y BR2_PACKAGE_ALSA_UTILS_ACONNECT=y BR2_PACKAGE_ALSA_UTILS_ALSALOOP=y BR2_PACKAGE_ALS A_UTILS_ALSAUCM=y BR2_PACKAGE_ALSA_UTILS_ALSATPLG=y BR2_PACKAGE_ALSA_UTILS_AMIDI=y BR2_PACKAGE_ALSA_UTILS_AMIXER=y BR2_PACKAGE_ALSA_UTILS_APLAY=y BR2_PACKAGE_ALSA_UTILS_APLAYMIDI=y BR2_PACKAGE_ALSA_UTILS_ARECORDMIDI=y BR2_PACKAGE_ALSA_UTILS_ASEQDUMP=y BR2_PACKAGE_ALSA_UTILS_ASEQNET=y BR2_PACKAGE_ALSA_UTILS_BAT=y BR2_PACKAGE_ALSA_UTILS_IECSET=y BR2_PACKAGE_ALSA_UTILS_SPEAKER_ TEST=y BR2_PACKAGE_FFMPEG_GPL=y BR2_PACKAGE_FFMPEG_NONFREE=y BR2_PACKAGE_FFMPEG_FFPLAY=y BR2_PACKAGE_FFMPEG_FFPROBE=y BR2_PACKAGE_FFMPEG_POSTPROC=y BR2_PACKAGE_FLAC=y BR2_PACKAGE_GSTREAMER1=y BR2_PACKAGE_GSTREAMER1_CHECK=y BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_APP=y BR2_PACKAGE_GST1_PLUGINS_BAYER2RGB_NEON=y BR2_PACKAGE_GST1_PLUGINS_GOOD=y BR2_PACKAGE_GST1_PLUGINS_BAD=y BR2_PACKAGE_GST1_ LIBAV=y BR2_PACKAGE_GDB=y BR2_PACKAGE_GDB_SERVER=y BR2_PACKAGE_GDB_DEBUGGER=y BR2_PACKAGE_GDB_TUI=y BR2_PACKAGE_BINUTILS=y BR2_PACKAGE_BINUTILS_TARGET=y BR2_PACKAGE_LIBTOOL=y BR2_PACKAGE_MAKE=y BR2_PACKAGE_PKGCONF=y BR2_PACKAGE_TREE=y BR2_PACKAGE_MMC_UTILS=y BR2_PACKAGE_BITSTREAM_VERA=y BR2_PACKAGE_CANTARELL=y BR2_PACKAGE_DEJAVU=y BR2_PACKAGE_FONT_AWESOME=y BR2_PACKAGE_GHOSTSCRIPT_FONTS=y BR2_PACKAGE_INCONSOLATA=y BR2_PACKAGE_LIBERATION=y BR2_PACKAGE_WQY_ZENHEI=y BR2_PACKAGE_DIRECTFB=y BR2_PACKAGE_SDL=y BR2_PACKAGE_SDL_GFX=y BR2_PACKAGE_SDL_IMAGE=y BR2_PACKAGE_SDL_IMAGE_GIF=y BR2_PACKAGE_SDL_IMAGE_JPEG=y BR2_PACKAGE_SDL_IMAGE_LBM=y BR2_PACKAGE_SDL_IMAGE_PCX=y BR2_PACKAGE_SDL_IMAGE_PNG=y BR2_PACKAGE_SDL_IMAGE_PNM=y BR2_PACKAGE_SDL_IMAGE_TARGA=y BR2_PACKAGE_SDL_IMAGE_TI FF=y BR2_PACKAGE_SDL_IMAGE_WEBP=y BR2_PACKAGE_SDL_IMAGE_XCF=y BR2_PACKAGE_SDL_IMAGE_XPM=y BR2_PACKAGE_SDL_IMAGE_XV=y BR2_PACKAGE_SDL_MIXER=y BR2_PACKAGE_SDL_MIXER_MIDI_TIMIDITY=y BR2_PACKAGE_SDL_NET=y BR2_PACKAGE_SDL_TTF=y BR2_PACKAGE_QT6=y BR2_PACKAGE_QT6BASE_CONCURRENT=y BR2_PACKAGE_QT6BASE_DBUS=y BR2_PACKAGE_QT6BASE_VULKAN=y BR2_PACKAGE_QT6BASE_FONTCONFIG=y BR 2_PACKAGE_QT6BASE_HARFBUZZ=y BR2_PACKAGE_QT6BASE_GIF=y BR2_PACKAGE_QT6BASE_JPEG=y BR2_PACKAGE_QT6BASE_PNG=y BR2_PACKAGE_QT6BASE_WIDGETS=y BR2_PACKAGE_QT6BASE_PRINTSUPPORT=y BR2_PACKAGE_QT6BASE_SYSLOG=y BR2_PACKAGE_QT6BASE_TEST=y BR2_PACKAGE_QT6BASE_TSLIB=y BR2_PACKAGE_QT6CORE5COMPAT=y BR2_PACKAGE_QT6SERIALBUS=y BR2_PACKAGE_QT6SVG=y BR2_PACKAGE_EVEMU=y BR2 _PACKAGE_EVTEST=y BR2_PACKAGE_KBD=y BR2_PACKAGE_LIBG7221=y BR2_PACKAGE_LIBGSM=y BR2_PACKAGE_LIBILBC=y BR2_PACKAGE_LIBSAMPLERATE=y BR2_PACKAGE_OPENCORE_AMR=y BR2_PACKAGE_PORTAUDIO=y BR2_PACKAGE_WEBRTC_AUDIO_PROCESSING=y BR2_PACKAGE_SQLITE_ENABLE_COLUMN_METADATA=y BR2_PACKAGE_IMLIB2=y BR2_PACKAGE_IMLIB2_JPEG=y BR2_PACKAGE_IMLIB2_PNG=y BR2_PACKAGE_IMLIB2_GIF=y BR2_PACKAGE_IMLIB2_ TIFF=y BR2_PACKAGE_IMLIB2_ID3=y BR2_PACKAGE_LIBJPEG=y BR2_PACKAGE_LIBDRM_INSTALL_TESTS=y BR2_PACKAGE_LIBFREEIMAGE=y BR2_PACKAGE_LIBVA=y BR2_PACKAGE_WAYLAND=yBR2_PACKAGE_WAYLAND_UTILS=y BR2_PACKAGE_LIBAIO=y BR2_PACKAGE_LIBV4L=y BR2_PACKAGE_LIBV4L_UTILS=y BR2_PACKAGE_LIBOPENH264=y BR2_PACKAGE_LIBYUV=y BR2_PACKAGE_X264=y BR2_PACKAGE_X264_CLI= y BR2_PACKAGE_LIBPJSIP=y BR2_PACKAGE_LIBUPNP=y BR2_PACKAGE_LIBCAP=y BR2_PACKAGE_FMT=y BR2_PACKAGE_PCRE2_32=y BR2_PACKAGE_DHCPCD=y BR2_PACKAGE_FREESWITCH=y BR2_PACKAGE_FREESWITCH_MOD_BCG729=y BR2_PACKAGE_OPENSSH=y BR2_PACKAGE_TCPDUMP=y BR2_PACKAGE_VSFTPD=y BR2_PACKAGE_ZSH=y BR2_PACKAGE_UTIL_LINUX_LIBFDISK=y BR2_PACKAGE_UTIL_LINUX_ AGETTY=y BR2_PACKAGE_UTIL_LINUX_FSCK=y BR2_PACKAGE_UTIL_LINUX_HWCLOCK=y BR2_PACKAGE_UTIL_LINUX_KILL=y BR2_PACKAGE_UTIL_LINUX_LSFD=y BR2_PACKAGE_UTIL_LINUX_MORE=y BR2_PACKAGE_UTIL_LINUX_MOUNT=y BR2_PACKAGE_UTIL_LINUX_SULOGIN=y BR2_TARGET_ROOTFS_EXT2=y BR2_TARGET_ROOTFS_EXT2_SIZE="512M" BR2_TARGET_ROOTFS_TAR_GZIP=y BR2_PACKAGE_HOST_ENVIRONMENT_SETUP=y ``` After testing, the QT APP application cross-compiled by the low version of QT Creator can run on the high version library; but the app compiled by the high version of QT Creator The application cannot run on a lower version of the QT library. ## Configuration before running QT From the above test, we know that the input device of the touch screen is `/dev/input/event1`. Note that the font is configured in my buildroot. If not Configure the font, QT application will use boxes instead of characters. Import the following environment variables into the current terminal. ```bash # Through the above evtest test, we can know that event1 is a touch screen export TSLIB_TSDEVICE=/dev/input/event1 export QT_QPA_FB_TSLIB=1 export QT_QPA_PLATFORM=linuxfb export QT_QPA_FONTDIR=/usr/share/fonts export LC_ALL=en_US.UTF-8 export LANG =en_US.UTF-8 # QT adapts to high-resolution screen export QT_SCREEN_SCALE_FACTORS=2 ``` Open the program test and observe the phenomenon Download QT development tools: https://download.qt.io/archive/online_installers/ I will write an article later QT cross compiler is set up on the host computer, I will be back soon~

freebsder

Thanks for sharing, looking forward to the follow-up