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