我们连接RGB的LCD屏后，先进入终端把开机启动的mxapp2关闭。有两种方式，一是killall mxapp2，二是用top查到mxapp2的进程，然后用kill 进程ID

执行测试

root@myir-yg2lx:~# framebuffer_testTheframebuffer device was opened successfully.vinfo.xres=800vinfo.yres=480vinfo.bits_per_bits=32vinfo.xoffset=0vinfo.yoffset=0red.offset=16green.offset=8blue.offset=0transp.offset=0finfo.line_length=3200finfo.type = PACKED_PIXELSTheframebuffer device was mapped to memory successfully.color: red rgb_val:00FF0000color: green rgb_val:0000FF00color: blue rgb_val:000000FFcolor: r & g rgb_val:00FFFF00color: g & b rgb_val:0000FFFFcolor: r & b rgb_val:00FF00FFcolor: white rgb_val:00FFFFFFcolor: black rgb_val:00000000

注意 如果有上述输出，但是屏没有显示，是因为设备树没有更新，需要进入uboot执行：

=> setenv fdt_file myb-rzg2l-disp.dtb => saveenv

触摸测试

需要连接带触摸的屏，我这里是MY-TFT070-K

终端执行行“evtest”进入测试界面

root@myir-yg2lx:~# evtest No device specified, trying to scanall of/dev/input/event* Available devices:/dev/input/event0: keyboard/dev/input/event1: generic ft5x06 (79)/dev/input/event2: A4TECHUSBDevice Keyboard/dev/input/event3: A4TECH USB Device System Control/dev/input/event4: A4TECH USB Device Consumer Control/dev/input/event5: A4TECH USB Device/dev/input/event6: A4TECH USB Device Select the device event number [0-6]:

从结果我看到，触摸屏ft5x06为event1。我们输入1

Selectthedeviceeventnumber[0-6]:1Inputdriverversionis1.0.1InputdeviceID:bus0x18vendor0x0product0x0version0x0Inputdevicename:"generic ft5x06 (79)"Supportedevents:Eventtype0(EV_SYN)Eventtype1(EV_KEY)Eventcode330(BTN_TOUCH)Eventtype3(EV_ABS)Eventcode0(ABS_X)Value155Min0Max799Eventcode1(ABS_Y)Value476Min0Max479Eventcode47(ABS_MT_SLOT)Value0Min0Max4Eventcode53(ABS_MT_POSITION_X)Value0Min0Max799Eventcode54(ABS_MT_POSITION_Y)Value0Min0Max479Eventcode57(ABS_MT_TRACKING_ID)Value0Min0Max65535Properties:Propertytype1(INPUT_PROP_DIRECT)Testing...(interrupttoexit)

然后我们点击屏就有相应的输出：

Event:time3029532101.3029532101,type3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 34Event: time3029532101.3029532101,type3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 486Event: time3029532101.3029532101,type3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 172Event: time3029532101.3029532101,type1 (EV_KEY), code 330 (BTN_TOUCH), value 1Event: time3029532101.3029532101,type3 (EV_ABS), code 0 (ABS_X), value 486Event: time3029532101.3029532101,type3 (EV_ABS), code 1 (ABS_Y), value 172Event: time3029532101.3029532101,-------------- SYN_REPORT ------------Event: time3029532101.3029532101,type3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 485Event: time3029532101.3029532101,type3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 171Event: time3029532101.3029532101,type3 (EV_ABS), code 0 (ABS_X), value 485Event: time3029532101.3029532101,type3 (EV_ABS), code 1 (ABS_Y), value 171Event: time3029532101.3029532101,-------------- SYN_REPORT ------------Event: time3029532101.3029532101,type3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 484Event: time3029532101.3029532101,type3 (EV_ABS), code 0 (ABS_X), value 484Event: time3029532101.3029532101,-------------- SYN_REPORT ------------Event: time3029532101.3029532101,type3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 485Event: time3029532101.30295322Event: time3029532101.3029532101,-------------- SYN_REPORT ------------Event: time3029532101.3029532101,type3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1Event: time3029532101.3029532101,type1 (EV_KEY), code 330 (BTN_TOUCH), value 0Event: time3029532101.3029532101,-------------- SYN_REPORT ------------

由上面可知，主要显示坐标值、键值，具体信息如下：

EV_SYN：同步事件

EV_KEY：按键事件，如 BTN_TOUCH 表示是触摸按键

EV_ABS：绝对坐标，如触摸屏上报的坐标

BTN_TOUCH：触摸按键

ABS_MT_SLOT：事件中对应的 value

ABS_MT_TRACKING_ID 表示采集信息开始

单点触摸信息是以 ABS 承载并按一定顺序发送,如：

ABS_X：是相对于屏幕绝对坐标 X

ABS_Y:是相对于屏幕绝对坐标 Y

而多点触摸信息则是以 ABS_MT 承载并按一定顺序发送，如：

ABS_MT_POSITION_X：表示屏幕接触面的中心点 x 坐标位置.

ABS_MT_POSITION_Y：表示屏幕接触面的中心点 Y 坐标位置

审核编辑：汤梓红