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→How to use the two LRADC buttons on the 24pin expansion board
<li><p>There are two LRADC buttons on the 24pin expansion board, and their locations are as shown in the figure below:</p>
<p>[[File:zero2w-img106.png]]</p></li>
<li><p>In the Linux system, the default key values of KEY1 and KEY2 are</p></li></ol>
{| class="wikitable" style="width:800px;text-align: center;"
|-
| '''Linux kernel'''
| '''KEY_ENTER, the enter key'''
|}
</ol>
<ol start="3" style="list-style-type: decimal;">
<li><p>Through the '''evtest''' command, we can check the key values reported after KEY1 and KEY2 are pressed.</p>
<ol style="list-style-type: lower-alpha;">
<li><p>linux5.4</p>
{| class="wikitable" style="width:800px;"
|-
|
<p>orangepi@orangepizero2w:~$ '''evtest'''</p>
<p>No device specified, trying to scan all of /dev/input/event*</p>
<p>Not running as root, no devices may be available.</p>
<p>Available devices:</p>
<p>'''/dev/input/event0event<span style="color: #FF0000">0</span>: <span style="color:#FF0000">sunxi-keyboard</span>'''</p>
<p>/dev/input/event1: sunxi-ir</p>
<p>/dev/input/event2: axp2101-pek</p>
<p>/dev/input/event6: PixArt USB Optical Mouse</p>
<p>/dev/input/event7: BRLTTY 6.3 Linux Screen Driver Keyboard</p>
<p>Select the device event number [0-7]: '''<span style="color:#FF0000">0 </span> #You need to enter the serial number corresponding to sunxi-keyboard'''</p>
<p>Input driver version is 1.0.1</p>
<p>Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100</p>
<p>Input device name: "sunxi-keyboard"</p>
<p>Supported events:</p>
:<p>Event type 0 (EV_SYN)</p>:<p>Event type 1 (EV_KEY)</p>::<p>Event code 2 (KEY_1)</p>::<p>Event code 28 (KEY_ENTER)</p>
<p>Properties:</p>
<p>Testing ... (interrupt to exit)</p>
<p>'''#The following are the key values reported after pressing KEY1 and KEY2'''</p>
<p>Event: time 1693555298.132314, type 1 (EV_KEY), code 2 (KEY_1), value 1</p>
<p>Event: time 1693555298.132314, -------------- SYN_REPORT ------------</p>
<p>Event: time 1693555298.601042, -------------- SYN_REPORT ------------</p>
<p>Event: time 1693555298.710415, type 1 (EV_KEY), code 28 (KEY_ENTER), value 0</p>
<p>Event: time 1693555298.710415, -------------- SYN_REPORT ------------</p>|}</li>
<li><p>linux6.1</p>
{| class="wikitable" style="width:800px;"
|-
|
<p>orangepi@orangepizero2w:~$ evtest</p>
<p>No device specified, trying to scan all of /dev/input/event*</p>
<p>Available devices:</p>
<p>/dev/input/event0: axp20x-pek</p>
<p>'''/dev/input/event1event<span style="color: #FF0000">1</span>: <span style="color:#FF0000">5070800.lradc</span>'''</p>
<p>/dev/input/event2: SONiX USB Keyboard</p>
<p>/dev/input/event3: SONiX USB Keyboard Consumer Control</p>
<p>/dev/input/event5: PixArt USB Optical Mouse</p>
<p>/dev/input/event6: sunxi-ir</p>
<p>Select the device event number [0-6]: '''<span style="color:#FF0000">1 </span> #You need to enter the serial number corresponding to 5070800.lradc'''</p>
<p>Input driver version is 1.0.1</p>
<p>Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100</p>
<p>Input device name: "5070800.lradc"</p>
<p>Supported events:</p>
:<p>Event type 0 (EV_SYN)</p>:<p>Event type 1 (EV_KEY)</p>::<p>Event code 2 (KEY_1)</p>::<p>Event code 28 (KEY_ENTER)</p>
<p>Properties:</p>
<p>Testing ... (interrupt to exit)</p>
<p>'''#The following are the key values reported after pressing KEY1 and KEY2'''</p>
<p>Event: time 1694075818.810877, type 1 (EV_KEY), code 2 (KEY_1), value 1</p>
<p>Event: time 1694075818.810877, -------------- SYN_REPORT ------------</p>
<p>Event: time 1694075819.536128, -------------- SYN_REPORT ------------</p>
<p>Event: time 1694075819.705009, type 1 (EV_KEY), code 28 (KEY_ENTER), value 0</p>
<p>Event: time 1694075819.705009, -------------- SYN_REPORT ------------</p>|}</li></ol>
</li>
<li><p>If you need to modify the key values reported after KEY1 and KEY2 are pressed, you can use the following method:</p>
<ol style="list-style-type: lower-alpha;">
<li><p>There is a '''sun50i-h618-lradc-keys.dts''' file under the > '''/usr/src/''' path, through which we can define KEY1 and KEY2 > as the desired key values.</p>{| class="wikitable" style="width:800px;" |-|
<p>orangepi@orangepizero2w:~$ '''cd /usr/src/'''</p>
<p>orangepi@orangepizero2w:/usr/src$ '''ls *.dts'''</p>
<p>sun50i-h618-lradc-keys.dts</p>|}</li><li><p>The contents of the '''sun50i-h618-lradc-keys.dts''' file in the > linux5.4 system are as follows:</p><ol style="list-style-type: lower-alphanone;"><li><p>a) KEY1 correspondence: modify '''key0 = <600 2>;''' where 2 is > the number corresponding to the desired key value</p></li><li><p>b) KEY2 correspondence: modify '''key1 = <800 28>;''' where 28 > is the number corresponding to the desired key value</p>{| class="wikitable" style="width:800px;" |-|
<p>orangepi@orangepizero2w:/usr/src$ '''sudo vim sun50i-h618-lradc-keys.dts'''</p>
<p>/dts-v1/;</p>
<p>/plugin/;</p>
<p>/ {</p>
:<p>fragment@0 {</p>::<p>target = <&keyboard>;</p> ::<p>__overlay__ {</p>:::<p>status = "okay";</p> :::<p>'''key0 = <600 <span style="color:#FF0000">2</span>>;'''</p>:::<p>'''key1 = <800 <span style="color:#FF0000">28</span>>;'''</p>::<p>};</p>:<p>};</p>
<p>};</p>
</li>
<li><p>The contents of the c.linux6.1 system > '''sun50i-h618-lradc-keys.dts''' file are as follows:</p><ol style="list-style-type: lower-alphanone;"><li><p>a) KEY1 corresponding: modify '''linux,code = <2>;''' the 2 in > it is the number corresponding to the desired key value</p></li><li><p>b) KEY2 correspondence: modify '''linux,code = <28>;''' the 28 > in it is the number corresponding to the desired key value</p>{| class="wikitable" style="width:800px;" |-| <p>orangepi@orangepizero2w:/usr/src$ '''sudo ''' '''vim ''' '''sun50i-h618-lradc-keys.dts'''</p>
<p>/dts-v1/;</p>
<p>/plugin/;</p>
<p>/ {</p>
:<p>fragment@0 {</p>::<p>target = <&r_lradc>;</p> ::<p>__overlay__ {</p>:::<p>status = "okay";</p> :::<p>button-500 {</p>::::<p>label = "KEY_1";</p>::::<p>'''linux,code = <<span style="color:#FF0000">2</span>>;'''</p>:::<p>};</p> :::<p>button-800 {</p>::::<p>label = "KEY_ENTER";</p>::::<p>'''linux,code = <<span style="color:#FF0000">28</span>>;'''</p>:::<p>};</p>::<p>};</p>:<p>};</p>
<p>};</p>
</li>
<li><p>For the key values that can be set, please refer to the macro > definition in the '''input-event-codes.h''' header file. Its > path in the kernel source code is:</p>{| class="wikitable" style="width:800px;" |-|
<p>orange-pi-5.4-sun50iw9/include/uapi/linux/input-event-codes.h</p>
<p>orange-pi-6.1-sun50iw9/include/uapi/linux/input-event-codes.h</p>|}</li><li><p>After modification, use the '''orangepi-add-overlay''' command to > add the sun50i-h618-lradc-keys.dts configuration to the > system.</p>{| class="wikitable" style="width:800px;" |-|
<p>orangepi@orangepizero2w:/usr/src$ '''sudo orangepi-add-overlay sun50i-h618-lradc-keys.dts'''</p>
<p>Compiling the overlay</p>
<p>Copying the compiled overlay file to /boot/overlay-user/</p>
<p>Reboot is required to apply the changes</p>|}</li><li><p>Then restart the system and the customized key values will take > effect.</p></li></ol>
</li></ol>
<span id="network-connection-test"></span>
== Network connection test ==
