我們連接RGB的LCD屏后，先進入終端把開機啟動的mxapp2關閉。有兩種方式，一是killall mxapp2，二是用top查到mxapp2的進程，然后用kill 進程ID

執行測試

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 如果有上述輸出，但是屏沒有顯示，是因為設備樹沒有更新，需要進入uboot執行：

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

觸摸測試

需要連接帶觸摸的屏，我這里是MY-TFT070-K

終端執行行“evtest”進入測試界面

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]:

從結果我看到，觸摸屏ft5x06為event1。我們輸入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)

然后我們點擊屏就有相應的輸出：

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，主要顯示坐標值、鍵值，具體信息如下：

?EV_SYN：同步事件

?EV_KEY：按鍵事件，如 BTN_TOUCH 表示是觸摸按鍵

?EV_ABS：絕對坐標，如觸摸屏上報的坐標

?BTN_TOUCH：觸摸按鍵

?ABS_MT_SLOT：事件中對應的 value

?ABS_MT_TRACKING_ID 表示采集信息開始

單點觸摸信息是以 ABS 承載并按一定順序發送,如：

?ABS_X：是相對于屏幕絕對坐標 X

?ABS_Y:是相對于屏幕絕對坐標 Y

而多點觸摸信息則是以 ABS_MT 承載并按一定順序發送，如：

?ABS_MT_POSITION_X：表示屏幕接觸面的中心點 x 坐標位置.

?ABS_MT_POSITION_Y：表示屏幕接觸面的中心點 Y 坐標位置

審核編輯：湯梓紅