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Orange Pi Zero 2W

添加852字节, 2023年9月20日 (三) 16:03

→‎24pin扩展板上的2个LRADC按键的使用方法

<li>24pin扩展板上有两个LRADC按键，位置如下图所示：

[[File:media/image106.png]]</li>

<li>在Linux系统中，KEY1和KEY2默认设置的键值为</li~~></ol~~>

{| class="wikitable" style="width:800px;text-align: center;"

|-

| '''Linux内核'''

| '''KEY_ENTER，即回车键'''

|}

</ol>

<li>通过'''evtest'''命令我们可以查看下KEY1和KEY2按下后上报的键值

<li>linux5.4

{| class="wikitable" style="width:800px;"

|-

|

orangepi@orangepizero2w:~$ '''evtest'''

No device specified, trying to scan all of /dev/input/event*

Not running as root, no devices may be available.

Available devices:

'''/dev/input/~~event0~~event0: sunxi-keyboard'''

/dev/input/event1: sunxi-ir

/dev/input/event2: axp2101-pek

/dev/input/event6: PixArt USB Optical Mouse

/dev/input/event7: BRLTTY 6.3 Linux Screen Driver Keyboard

Select the device event number [0-7]: '''0 #需要输入sunxi-keyboard对应的序号'''

Input driver version is 1.0.1

Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100

Input device name: "sunxi-keyboard"

Supported events:

:Event type 0 (EV_SYN):Event type 1 (EV_KEY)::Event code 2 (KEY_1)::Event code 28 (KEY_ENTER)

Properties:

Testing ... (interrupt to exit)

'''#下面是按下KEY1和KEY2后上报的键值'''

Event: time 1693555298.132314, type 1 (EV_KEY), code 2 (KEY_1), value 1

Event: time 1693555298.132314, -------------- SYN_REPORT ------------

Event: time 1693555298.601042, -------------- SYN_REPORT ------------

Event: time 1693555298.710415, type 1 (EV_KEY), code 28 (KEY_ENTER), value 0

Event: time 1693555298.710415, -------------- SYN_REPORT ------------|}</li>

<li>linux6.1

{| class="wikitable" style="width:800px;"

|-

|

orangepi@orangepizero2w:~$ evtest

No device specified, trying to scan all of /dev/input/event*

Available devices:

/dev/input/event0: axp20x-pek

'''/dev/input/~~event1~~event1: 5070800.lradc'''

/dev/input/event2: SONiX USB Keyboard

/dev/input/event3: SONiX USB Keyboard Consumer Control

/dev/input/event5: PixArt USB Optical Mouse

/dev/input/event6: sunxi-ir

Select the device event number [0-6]: '''1 #需要输入5070800.lradc对应的序号'''

Input driver version is 1.0.1

Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100

Input device name: "5070800.lradc"

Supported events:

:Event type 0 (EV_SYN):Event type 1 (EV_KEY)::Event code 2 (KEY_1)::Event code 28 (KEY_ENTER)

Properties:

Testing ... (interrupt to exit)

'''#下面是按下KEY1和KEY2后上报的键值'''

Event: time 1694075818.810877, type 1 (EV_KEY), code 2 (KEY_1), value 1

Event: time 1694075818.810877, -------------- SYN_REPORT ------------

Event: time 1694075819.536128, -------------- SYN_REPORT ------------

Event: time 1694075819.705009, type 1 (EV_KEY), code 28 (KEY_ENTER), value 0

Event: time 1694075819.705009, -------------- SYN_REPORT ------------|}</li></ol>

</li>

<li>如果需要修改KEY1和KEY2按下后上报的按键值，可以使用下面的方法：

<li>在'''/usr/src/'''路径下有一个'''sun50i-h618-lradc-keys.dts'''文件，我们可以通过它来定义KEY1和KEY2为想要的按键值

{| class="wikitable" style="width:800px;"

|-

|

orangepi@orangepizero2w:~$ '''cd /usr/src/'''

orangepi@orangepizero2w:/usr/src$ '''ls *.dts'''

sun50i-h618-lradc-keys.dts|}</li>

<li>linux5.4系统'''sun50i-h618-lradc-keys.dts'''文件的内容如下所示：

<li>KEY1对应：修改'''key0 = <600 > 2>;'''中的2为想要的按键值对应的数字</li>

<li>KEY2对应：修改'''key1 = <800 > 28>;'''中的28为想要的按键值对应的数字

{| class="wikitable" style="width:800px;"

|-

|

orangepi@orangepizero2w:/usr/src$ '''sudo vim sun50i-h618-lradc-keys.dts'''

/dts-v1/;

/plugin/;

/ {

:fragment@0 {::target = <&keyboard>; ::__overlay__ {:::status = "okay"; :::'''key0 = <600 2>;''':::'''key1 = <800 28>;'''::};:};

};

~~~~|}~~;};~~</li></ol>

</li>

<li>linux6.1系统'''sun50i-h618-lradc-keys.dts'''文件的内容如下所示：

<li>KEY1对应：修改'''linux,code = > <2>;'''中的2为想要的按键值对应的数字</li>

<li>KEY2对应：修改'''linux,code = > <28>;'''中的28为想要的按键值对应的数字

{| class="wikitable" style="width:800px;"

|-

|

orangepi@orangepizero2w:/usr/src$ '''sudo''' '''vim''' '''sun50i-h618-lradc-keys.dts'''

/dts-v1/;

/plugin/;

/ {

:fragment@0 {::target = <&r_lradc>; ::__overlay__ {:::status = "okay"; :::button-500 {::::label = "KEY_1";::::'''linux,code = <2>;''':::}; :::button-800 {::::label = "KEY_ENTER";::::'''linux,code = <28>;''':::};::};:};

};

~~button-800 {label = "KEY_ENTER";'''linux,code = <28>;'''};};~~|}~~;};~~</li></ol>

</li>

<li>可以设置的按键值请参考下'''input-event-codes.h'''头文件中的宏定义，其在内核源码中的路径为：

{| class="wikitable" style="width:800px;"

|-

|

orange-pi-5.4-sun50iw9/include/uapi/linux/input-event-codes.h

orange-pi-6.1-sun50iw9/include/uapi/linux/input-event-codes.h|}</li>

<li>修改完后，再使用'''orangepi-add-overlay'''命令让sun50i-h618-lradc-keys.dts配置添加到系统中

{| class="wikitable" style="width:800px;"

|-

|

orangepi@orangepizero2w:/usr/src$ '''sudo orangepi-add-overlay sun50i-h618-lradc-keys.dts'''

Compiling the overlay

Copying the compiled overlay file to /boot/overlay-user/

Reboot is required to apply the changes|}</li>

<li>然后重启系统自定义的按键值就会生效了</li></ol>

</li></ol>

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