使用getevent在Android中除錯輸入子系統
阿新 • • 發佈:2020-12-23
# Android getevent用法詳解
背景
在除錯安卓裝置按鍵,想使用hexdump,但是發現沒有找到,反而找到了這個更好用的工具。
以下是我的除錯片段
# getevent -l /dev/input/event0 EV_KEY KEY_ENTER DOWN EV_SYN SYN_REPORT 00000000 EV_KEY KEY_ENTER UP EV_SYN SYN_REPORT 00000000 EV_KEY KEY_UP DOWN EV_SYN SYN_REPORT 00000000 EV_KEY KEY_UP UP EV_SYN SYN_REPORT 00000000 EV_KEY KEY_BACK DOWN EV_SYN SYN_REPORT 00000000
前言
修改來自:Android getevent用法詳解
getevent 指令用於獲取 input 輸入事件,比如獲取按鍵上報資訊、獲取觸控式螢幕上報資訊等。
程式的實現:system/core/toolbox/getevent.c
用法
getevent -h
:檢視 getevent 幫助資訊
# getevent -h Usage: getevent [-t] [-n] [-s switchmask] [-S] [-v [mask]] [-d] [-p] [-i] [-l] [-q] [-c count] [-r] [device] -t: show time stamps -n: don't print newlines -s: print switch states for given bits -S: print all switch states -v: verbosity mask (errs=1, dev=2, name=4, info=8, vers=16, pos. events=32, props=64) -d: show HID descriptor, if available -p: show possible events (errs, dev, name, pos. events) -i: show all device info and possible events -l: label event types and names in plain text -q: quiet (clear verbosity mask) -c: print given number of events then exit -r: print rate events are received
getevent
:顯示當前有那些輸入裝置,數量與 /dev/input 目錄下相同。
由於會將對應的裝置節點以及裝置描述打印出來,因此非常方便除錯人員後續選擇對應的裝置。
此時,接收任何一切輸入
# getevent -l add device 1: /dev/input/event6 name: "msm8909-snd-card Headset Jack" add device 2: /dev/input/event5 name: "msm8909-snd-card Button Jack" add device 3: /dev/input/event2 name: "qpnp_pon" add device 4: /dev/input/event1 name: "gpiokey-pulley" could not get driver version for /dev/input/mice, Not a typewriter add device 5: /dev/input/event3 name: "gpio-keys" add device 6: /dev/input/event0 name: "aw9523-keys" add device 7: /dev/input/event4 name: "accelerometer" /dev/input/event0: EV_KEY KEY_UP DOWN /dev/input/event0: EV_SYN SYN_REPORT 00000000 /dev/input/event0: EV_KEY KEY_UP UP /dev/input/event0: EV_SYN SYN_REPORT 00000000 /dev/input/event0: EV_KEY KEY_LEFT DOWN /dev/input/event0: EV_SYN SYN_REPORT 00000000 /dev/input/event0: EV_KEY KEY_LEFT UP /dev/input/event0: EV_SYN SYN_REPORT 00000000 /dev/input/event2: EV_KEY KEY_POWER UP /dev/input/event2: EV_SYN SYN_REPORT 00000000 /dev/input/event3: EV_KEY KEY_F1 DOWN /dev/input/event3: EV_SYN SYN_REPORT 00000000 /dev/input/event3: EV_KEY KEY_F1 UP /dev/input/event3: EV_SYN SYN_REPORT 00000000 /dev/input/event3: EV_KEY KEY_F1 DOWN /dev/input/event3: EV_SYN SYN_REPORT 00000000 # ls /dev/input/ event0 event1 event2 event3 event4 event5 event6 mice
讀取指定的裝置 讀取 event3 資料(觸控式螢幕)
# getevent /dev/input/event3
0003 0039 00000004
0003 0035 00002324
0003 0036 00001a9f
0001 014a 00000001
0003 0000 00002324
0003 0001 00001a9f
0000 0000 00000000
0003 0039 ffffffff
0001 014a 00000000
0000 0000 00000000
-t:顯示時間戳
# getevent -t /dev/input/event3
[ 1141.248434] 0003 0039 0000000e
[ 1141.248434] 0003 0035 00002cd4
[ 1141.248434] 0003 0036 00001a09
[ 1141.248434] 0001 014a 00000001
[ 1141.248434] 0003 0000 00002cd4
[ 1141.248434] 0003 0001 00001a09
[ 1141.248434] 0000 0000 00000000
[ 1141.322181] 0003 0039 ffffffff
[ 1141.322181] 0001 014a 00000000
[ 1141.322181] 0000 0000 00000000
-n:不換行列印
# getevent -n /dev/input/event3
0003 0039 000000020003 0035 00002f000003 0036 00001a4e0001 014a 000000010003 0000 00002f000003 0001 00001a4e0000 0000 000000000003 0039 ffffffff0001 014a 000000000000 0000 000000000003 0039 000000030003 0035 00002e880003 0036 000019b80001 014a 000000010003 0000 00002e880003 0001 000019b80000 0000 000000000003 0039 ffffffff0001 014a 000000000000 0000 000000000003 0039 000000040003 0035 00002d700003 0036 00001a000001 014a 000000010003 0000 00002d700003 0001 00001a000000 0000 000000000003 0039 ffffffff0001 014a 000000000000 0000 000000000003 0039 000000050003 0035 00002d080003 0036 000019a50001 014a 000000010003 0000 00002d080003 0001 000019a50000 0000 000000000003 0039 ffffffff0001 014a 000000000000
-s:顯示指定位的開關狀態
# getevent -s5 /dev/input/event3
0000
-S:顯示所有位的開關狀態
# getevent -S /dev/input/event3
getevent -S /dev/input/event3
0000
-v:根據 mask 值顯示相關資訊,執行後會一直顯示上報資料
errs=1, dev=2, name=4, info=8, vers=16, pos. events=32, props=64
預設顯示 dev| name| info| vers = 30;
# getevent -v /dev/input/event3
add device 1: /dev/input/event3
bus: 0003
vendor 222a
product 004d
version 0110
name: "ILITEK Multi-Touch-V3020"
location: "usb-ff540000.usb-1.3/input0"
id: ""
version: 1.0.1
# getevent -v30 /dev/input/event3
add device 1: /dev/input/event3
bus: 0003
vendor 222a
product 004d
version 0110
name: "ILITEK Multi-Touch-V3020"
location: "usb-ff540000.usb-1.3/input0"
id: ""
version: 1.0.1
# getevent -v2 /dev/input/event3
add device 1: /dev/input/event3
# getevent -v8 /dev/input/event3
getevent -v8 /dev/input/event3
bus: 0003
vendor 222a
product 004d
version 0110
location: "usb-ff540000.usb-1.3/input0"
id: ""
# getevent -v16 /dev/input/event3
version: 1.0.1
# getevent -v32 /dev/input/event3
events:
KEY (0001): 014a
ABS (0003): 0000 : value 12008, min 0, max 16384, fuzz 0, flat 0, resolution 31
0001 : value 5790, min 0, max 9600, fuzz 0, flat 0, resolution 32
002f : value 0, min 0, max 9, fuzz 0, flat 0, resolution 0
0035 : value 0, min 0, max 16384, fuzz 0, flat 0, resolution 31
0036 : value 0, min 0, max 9600, fuzz 0, flat 0, resolution 32
0039 : value 0, min 0, max 65535, fuzz 0, flat 0, resolution 0
-d:如果裝置可用,顯示裝置隱藏的描述資訊
-p:顯示裝置支援的事件型別和編碼方式
# getevent -p /dev/input/event3
add device 1: /dev/input/event3
name: "ILITEK Multi-Touch-V3020"
events:
KEY (0001): 014a
ABS (0003): 0000 : value 13084, min 0, max 16384, fuzz 0, flat 0, resolution 31
0001 : value 5284, min 0, max 9600, fuzz 0, flat 0, resolution 32
002f : value 0, min 0, max 9, fuzz 0, flat 0, resolution 0
0035 : value 0, min 0, max 16384, fuzz 0, flat 0, resolution 31
0036 : value 0, min 0, max 9600, fuzz 0, flat 0, resolution 32
0039 : value 0, min 0, max 65535, fuzz 0, flat 0, resolution 0
input props:
INPUT_PROP_DIRECT
-i:顯示裝置的所有資訊和支援的事件,比 -p 顯示更多資訊
# getevent -i /dev/input/event3
-l:以文字形式輸出事件型別和名稱,比 -t 更清楚直觀
# getevent -l /dev/input/event3
getevent -l /dev/input/event3
// 事件型別 事件碼 事件值
EV_ABS ABS_MT_TRACKING_ID 0000000f
EV_ABS ABS_MT_POSITION_X 00002bbc
EV_ABS ABS_MT_POSITION_Y 00001b6d
EV_KEY BTN_TOUCH DOWN
EV_ABS ABS_X 00002bbc
EV_ABS ABS_Y 00001b6d
EV_SYN SYN_REPORT 00000000
EV_ABS ABS_MT_TRACKING_ID ffffffff
EV_KEY BTN_TOUCH UP
EV_SYN SYN_REPORT 00000000
-q:暫時不會使用
-c:列印固定數量的事件並退出
# getevent -c 10 /dev/input/event3
getevent -c 10 /dev/input/event3
0003 0039 00000012
0003 0035 000038a4
0003 0036 000008f5
0001 014a 00000001
0003 0000 000038a4
0003 0001 000008f5
0000 0000 00000000
0003 0039 ffffffff
0001 014a 00000000
0000 0000 00000000
-r:顯示事件上報速率
// 檢測觸控式螢幕報點速率
# getevent -r /dev/input/event3
getevent -r /dev/input/event3
0003 0039 00000015
0003 0035 000030d8
0003 0036 00001954
0001 014a 00000001
0003 0000 000030d8
0003 0001 00001954
0000 0000 00000000 rate 0
0003 0039 ffffffff
0001 014a 00000000
0000 0000 00000000 rate 9
引數可以組合使用,一次性檢視需要的輸入資訊
# getevent -tlr /dev/input/event3
[ 2514.550104] EV_ABS ABS_MT_TRACKING_ID 0000001c
[ 2514.550104] EV_ABS ABS_MT_POSITION_X 00002dac
[ 2514.550104] EV_ABS ABS_MT_POSITION_Y 000018ca
[ 2514.550104] EV_KEY BTN_TOUCH DOWN
[ 2514.550104] EV_ABS ABS_X 00002dac
[ 2514.550104] EV_ABS ABS_Y 000018ca
[ 2514.550104] EV_SYN SYN_REPORT 00000000 rate 0
[ 2514.638845] EV_ABS ABS_MT_TRACKING_ID ffffffff
[ 2514.638845] EV_KEY BTN_TOUCH UP
[ 2514.638845] EV_SYN SYN_REPORT 00000000 rate 11