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_test
The framebuffer device was opened successfully.
vinfo.xres=800
vinfo.yres=480
vinfo.bits_per_bits=32
vinfo.xoffset=0
vinfo.yoffset=0
red.offset=16
green.offset=8
blue.offset=0
transp.offset=0
finfo.line_length=3200
finfo.type = PACKED_PIXELS
The framebuffer device was mapped to memory successfully.
color: red rgb_val: 00FF0000
color: green rgb_val: 0000FF00
color: blue rgb_val: 000000FF
color: r & g rgb_val: 00FFFF00
color: g & b rgb_val: 0000FFFF
color: r & b rgb_val: 00FF00FF
color: white rgb_val: 00FFFFFF
color: 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 scan all of /dev/input/event*
Available devices:
/dev/input/event0: keyboard
/dev/input/event1: generic ft5x06 (79)
/dev/input/event2: A4TECH USB Device 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
Select the device event number [0-6]: 1
Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
Input device name: "generic ft5x06 (79)"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 330 (BTN_TOUCH)
Event type 3 (EV_ABS)
Event code 0 (ABS_X)
Value 155
Min 0
Max 799
Event code 1 (ABS_Y)
Value 476
Min 0
Max 479
Event code 47 (ABS_MT_SLOT)
Value 0
Min 0
Max 4
Event code 53 (ABS_MT_POSITION_X)
Value 0
Min 0
Max 799
Event code 54 (ABS_MT_POSITION_Y)
Value 0
Min 0
Max 479
Event code 57 (ABS_MT_TRACKING_ID)
Value 0
Min 0
Max 65535
Properties:
Property type 1 (INPUT_PROP_DIRECT)
Testing ... (interrupt to exit)
然后我们点击屏就有相应的输出：
```
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 34
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 486
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 172
Event: time 3029532101.3029532101, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 0 (ABS_X), value 486
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 1 (ABS_Y), value 172
Event: time 3029532101.3029532101, -------------- SYN_REPORT ------------
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 485
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 171
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 0 (ABS_X), value 485
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 1 (ABS_Y), value 171
Event: time 3029532101.3029532101, -------------- SYN_REPORT ------------
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 484
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 0 (ABS_X), value 484
Event: time 3029532101.3029532101, -------------- SYN_REPORT ------------
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 485
Event: time 3029532101.30295322
Event: time 3029532101.3029532101, -------------- SYN_REPORT ------------
Event: time 3029532101.3029532101, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
Event: time 3029532101.3029532101, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0
Event: time 3029532101.3029532101, -------------- 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
【小结】
这组测试可以测试LCD的各种 单 色显示以及测试触摸是否正常
提升卡
变色卡
千斤顶
1/8 
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