[技术]

【飞凌OKA40i-C开发板试用体验】LVGL移植与测评

2022-9-27 10:42:52 1931 LVGL

0 感谢“电子发烧友网”和飞凌嵌入式公司提供了本次OKA40i-C开发板的评测机会。上次我们介绍了视频监控的测试，今天来介绍一下轻量级图形界面库LVGL的移植与测评。一、 LVGL源代码下载 OKA40i开发板官方提供了Qt作为图形界面开发工具。不过对于简单的用户界面程序，Qt有点杀鸡用牛刀的意思。今天介绍一下轻量级的图形界面库LVGL。LVGL的项目作者是来自匈牙利首都布达佩斯的 Gábor Kiss-Vámosi。它自带着接近三十多种小组件，动画和操作非常流畅，同时配置要求很低，再加上开源和免费，使得它迅速流行起来，AliOS Things甚至把它作为默认的图形界面库。在LVGL的github网站上可以下载源代码（https://github.com/lvgl/），在LVGL的官方仓库中包括lv_port_linux_frame_buffer，它包括了在Linux下移植所需要的所有代码。这个仓库会链接到lvgl和lv_drivers两个仓库，所以一定要用git clone的方式下载，不要采用打包成zip的方式。lv_demos这仓库是不需要的，因为例程已经都包括在lvgl仓库里面了。如果github下载太慢，可以使用gitee的镜像：https://gitee.com/mculover666/lv_port_linux_frame_buffer.git。二、配置LVGL 1、修改makefile 需要从makefile中删除-Wshift-negative-value这个编译选项，因为我们的编译器不支持，同时加上-std=c99这个选项，因为程序在for循环中使用了C99语法。下面是修改前后的编译选项对比。 2、修改lvgl源代码由于我们的编译器不支持PRIX32这个常量的定义，需要修改lvglsrcdrawswlv_draw_sw_letter.c文件，将其中一句log注释掉：也可以把这句改为： LV_LOG_WARN("lv_draw_letter: glyph dsc. not found for U+X%", letter); 复制代码 3、修改内存相关选项 LVGL默认是使用基于 TLSF 的内存管理算法，不过它开的缓冲区对于我们的屏幕而言显然太小了，需要修改lv_conf.h中的定义 LV_MEM_CUSTOM 为 1，否则运行时会崩溃。定义 LV_MEM_CUSTOM 为 1表示采用标准C语言的分配内存函数。 4、显示设置显示输出方面我们还是通过HDMI接口输出到智能电视。LVGL支持通过直接访问显示缓冲区（framebuffer）和SDL等多种方式进行输出。我们此次通过framebuffer输出，而且我们的输出设备是dev/fb0，所以我们不需要修改任何配置，默认配置（lv_drv_conf.h）如下： 4、增加鼠标支持输入采用USB鼠标。使用下面的命令可以看到当前系统有哪些输入设备： cat /proc/bus/input/devices 复制代码输出结果如下： I: Bus=0019 Vendor=0001 Product=0001 Version=0100 N: Name="sunxi-ths" P: Phys=sunxiths/input0 S: Sysfs=/devices/virtual/input/input0 U: Uniq= H: Handlers=event0 B: PROP=0 B: EV=9 B: ABS=100 0 I: Bus=0019 Vendor=0001 Product=0001 Version=0100 N: Name="sunxi-keyboard" P: Phys=sunxikbd/input0 S: Sysfs=/devices/virtual/input/input1 U: Uniq= H: Handlers=kbd event1 B: PROP=0 B: EV=3 B: KEY=40040 0 0 10000000 I: Bus=0019 Vendor=0001 Product=0001 Version=0100 N: Name="sunxi-keypad" P: Phys=Keypad/input2 S: Sysfs=/devices/virtual/input/kp0 U: Uniq= H: Handlers=sysrq kbd event2 B: PROP=0 B: EV=3 B: KEY=ffffffff fffffffe I: Bus=0019 Vendor=0001 Product=0001 Version=0100 N: Name="axp22-powerkey" P: Phys=m1kbd/input2 S: Sysfs=/devices/soc.0/1c2ac00.twi/i2c-0/0-0034/axp22-powerkey/input/input3 U: Uniq= H: Handlers=kbd event3 B: PROP=0 B: EV=7 B: KEY=100000 0 0 0 B: REL=0 I: Bus=0003 Vendor=2717 Product=5016 Version=0110 N: Name="MOSART Semi. Mi Wireless Mouse Lite" P: Phys=usb-sunxi-ohci-1/input0 S: Sysfs=/devices/soc.0/1c1c000.ohci2-controller/usb4/4-1/4-1:1.0/input/input4 U: Uniq= H: Handlers=sysrq kbd event4 B: PROP=0 B: EV=120013 B: KEY=10000 7 ff9f207a c14057ff febeffdf ffefffff ffffffff fffffffe B: MSC=10 B: LED=7 I: Bus=0003 Vendor=2717 Product=5016 Version=0110 N: Name="MOSART Semi. Mi Wireless Mouse Lite" P: Phys=usb-sunxi-ohci-1/input1 S: Sysfs=/devices/soc.0/1c1c000.ohci2-controller/usb4/4-1/4-1:1.1/input/input5 U: Uniq= H: Handlers=kbd mouse0 event5 B: PROP=0 B: EV=10001f B: KEY=3007f 0 0 0 0 483ffff 17aff32d bf544446 0 0 1f0001 120f93 8b17c000 677bfa d941dfed 9ed680 4400 0 10000002 B: REL=1c3 B: ABS=1f01 0 B: MSC=10 由于我们在开发板的两个USB口都曾经使用过USB鼠标，所以我们看到两个USB鼠标设备，分别对应event4和event5。我们可以用evtest命令测试到底哪个设备是当前使用的。OKA40i开发板上包括了evtest，可以进行输入设备的测试。经过测试，我们发现event5对应的设备是我们目前连接的鼠标。 # evtest No device specified, trying to scan all of /dev/input/event* Available devices: /dev/input/event0: sunxi-ths /dev/input/event1: sunxi-keyboard /dev/input/event2: sunxi-keypad /dev/input/event3: axp22-powerkey /dev/input/event4: MOSART Semi. Mi Wireless Mouse Lite /dev/input/event5: MOSART Semi. Mi Wireless Mouse Lite Select the device event number [0-5]: 5 Input driver version is 1.0.1 Input device ID: bus 0x3 vendor 0x2717 product 0x5016 version 0x110 Input device name: "MOSART Semi. Mi Wireless Mouse Lite" Supported events: Event type 0 (EV_SYN) Event type 1 (EV_KEY) Event code 1 (KEY_ESC) Event code 28 (KEY_ENTER) Event code 74 (KEY_KPMINUS) …… Event code 592 (KEY_BRIGHTNESS_MIN) Event code 593 (KEY_BRIGHTNESS_MAX) Event type 2 (EV_REL) Event code 0 (REL_X) Event code 1 (REL_Y) Event code 6 (REL_HWHEEL) Event code 7 (REL_DIAL) Event code 8 (REL_WHEEL) Event type 3 (EV_ABS) Event code 32 (ABS_VOLUME) Value 0 Min 0 Max 896 Event code 40 (ABS_MISC) Value 0 Min 0 Max 255 Event code 41 (?) Value 0 Min 0 Max 255 Event code 42 (?) Value 0 Min 0 Max 255 Event code 43 (?) Value 0 Min 0 Max 255 Event code 44 (?) Value 0 Min 0 Max 255 Event type 4 (EV_MSC) Event code 4 (MSC_SCAN) Key repeat handling: Repeat type 20 (EV_REP) Repeat code 0 (REP_DELAY) Value 400 Repeat code 1 (REP_PERIOD) Value 80 Properties: Testing ... (interrupt to exit) Event: time 1664272853.352702, type 2 (EV_REL), code 0 (REL_X), value 32 Event: time 1664272853.352702, type 2 (EV_REL), code 1 (REL_Y), value -19 Event: time 1664272853.352702, -------------- SYN_REPORT ------------ Event: time 1664272853.368699, type 2 (EV_REL), code 0 (REL_X), value 12 Event: time 1664272853.368699, type 2 (EV_REL), code 1 (REL_Y), value -14 Event: time 1664272853.368699, -------------- SYN_REPORT ------------ Event: time 1664272853.372717, type 2 (EV_REL), code 0 (REL_X), value 3 Event: time 1664272853.372717, type 2 (EV_REL), code 1 (REL_Y), value -8 Event: time 1664272853.372717, -------------- SYN_REPORT ------------ Event: time 1664272853.384737, type 2 (EV_REL), code 0 (REL_X), value -9 Event: time 1664272853.384737, type 2 (EV_REL), code 1 (REL_Y), value 1 Event: time 1664272853.384737, -------------- SYN_REPORT ------------ Event: time 1664272853.388724, type 2 (EV_REL), code 0 (REL_X), value -9 Event: time 1664272853.388724, type 2 (EV_REL), code 1 (REL_Y), value 7 Event: time 1664272853.388724, -------------- SYN_REPORT ------------ Event: time 1664272853.400736, type 2 (EV_REL), code 0 (REL_X), value -8 Event: time 1664272853.400736, type 2 (EV_REL), code 1 (REL_Y), value 14 Event: time 1664272853.400736, -------------- SYN_REPORT ------------ 修改lv_drv_conf.h中EVDEV所对应的设备名为："/dev/input/event5"。这样鼠标就可以正常工作了。 5、修改main.c 在main.c根据自己使用的屏幕修改分辨率： disp_drv.hor_res = 1980; // 原来是800 disp_drv.ver_res = 1080; // 原来是480 复制代码一、编译与测试 1、Widgets示例要使用LVGL的官方测试例Widgets，首先确保lv_conf.h中的定义的LV_USE_DEMO_WIDGETS，然后确认在main.c中调用了lv_demo_widgets()。 2、Benchmark示例 LVGL的官方测试例Benchmark可以用来测试显示性能。完整的测试结果如下： LVGL v8.3.0 Benchmark (in csv format) Weighted FPS: 69 Opa. speed: 88% Rectangle,105 Rectangle + opa,54 Rectangle rounded,96 Rectangle rounded + opa,53 Circle,60 Circle + opa,28 Border,134 Border + opa,132 Border rounded,139 Border rounded + opa,130 Circle border,55 Circle border + opa,50 Border top,144 Border top + opa,144 Border left,133 Border left + opa,138 Border top + left,140 Border top + left + opa,137 Border left + right,145 Border left + right + opa,133 Border top + bottom,143 Border top + bottom + opa,144 Shadow small,63 Shadow small + opa,59 Shadow small offset,64 Shadow small offset + opa,55 Shadow large,38 Shadow large + opa,36 Shadow large offset,36 Shadow large offset + opa,36 Image RGB,45 Image RGB + opa,29 Image ARGB,35 Image ARGB + opa,31 Image chorma keyed,41 Image chorma keyed + opa,31 Image indexed,25 Image indexed + opa,22 Image alpha only,27 Image alpha only + opa,23 Image RGB recolor,30 Image RGB recolor + opa,22 Image ARGB recolor,25 Image ARGB recolor + opa,22 Image chorma keyed recolor,26 Image chorma keyed recolor + opa,22 Image indexed recolor,20 Image indexed recolor + opa,18 Image RGB rotate,35 Image RGB rotate + opa,21 Image RGB rotate anti aliased,11 Image RGB rotate anti aliased + opa,10 Image ARGB rotate,33 Image ARGB rotate + opa,27 Image ARGB rotate anti aliased,10 Image ARGB rotate anti aliased + opa,9 Image RGB zoom,57 Image RGB zoom + opa,35 Image RGB zoom anti aliased,16 Image RGB zoom anti aliased + opa,14 Image ARGB zoom,47 Image ARGB zoom + opa,39 Image ARGB zoom anti aliased,13 Image ARGB zoom anti aliased + opa,12 Text small,157 Text small + opa,154 Text medium,151 Text medium + opa,155 Text large,158 Text large + opa,154 Text small compressed,0 Text small compressed + opa,0 Text medium compressed,0 Text medium compressed + opa,0 Text large compressed,0 Text large compressed + opa,0 Line,75 Line + opa,76 Arc think,53 Arc think + opa,53 Arc thick,52 Arc thick + opa,50 Substr. rectangle,6 Substr. rectangle + opa,0 Substr. border,0 Substr. border + opa,0 Substr. shadow,0 Substr. shadow + opa,0 Substr. image,0 Substr. image + opa,0 Substr. line,2 Substr. line + opa,1 Substr. arc,49 Substr. arc + opa,50 Substr. text,4 Substr. text + opa,4 0
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