Key
<h4>休眠按键的使用</h4>
<p><img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=bf9c42dd5bc7e15ee82d687c86949a64&amp;file=file.png" alt="" />
（注：如图标注的按键为休眠按键，长按3S后系统将会进入休眠状态；再次按下，系统才会启动。）</p>
<h4>Retrun 按键的使用</h4>
<p><img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=d4fedf0664eaf319f5e3a5f27548b055&amp;file=file.png" alt="" />
注：如图标注的按键为 Return 按键，可以在系统下测试 Return 按键，输入命令：</p>
<pre><code class="language-shell">evtest</code></pre>
<p>会出现如下显示，测试 Return 按键，需要输入<code>2</code>:</p>
<pre><code class="language-shell">root@rk3588:/# evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0: rk805 pwrkey
/dev/input/event1: headset-keys
/dev/input/event2: adc-keys
/dev/input/event3: rockchip-hdmi0 rockchip-hdmi0
/dev/input/event4: rk-headset
Select the device event number [0-4]:</code></pre>
<p>Return 按键按下时会输出<code>1</code>，当 Return 按键松开时输出<code>0</code>，如下：</p>
<pre><code class="language-shell">root@rk3588:/# evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0: rk805 pwrkey
/dev/input/event1: headset-keys
/dev/input/event2: adc-keys
/dev/input/event3: rockchip-hdmi0 rockchip-hdmi0
/dev/input/event4: rk-headset
Select the device event number [0-4]: 2
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100
Input device name: &quot;adc-keys&quot;
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 114 (KEY_VOLUMEDOWN)
Event code 115 (KEY_VOLUMEUP)
Event code 139 (KEY_MENU)
Event code 158 (KEY_BACK)
Properties:
Testing ... (interrupt to exit)
Event: time 1725350827.445832, type 1 (EV_KEY), code 115 (KEY_VOLUMEUP), value 1
Event: time 1725350827.445832, -------------- SYN_REPORT ------------
Event: time 1725350827.859138, type 1 (EV_KEY), code 115 (KEY_VOLUMEUP), value 0
Event: time 1725350827.859138, -------------- SYN_REPORT ------------
Event: time 1725350828.995828, type 1 (EV_KEY), code 115 (KEY_VOLUMEUP), value 1
Event: time 1725350828.995828, -------------- SYN_REPORT ------------
Event: time 1725350829.305761, type 1 (EV_KEY), code 115 (KEY_VOLUMEUP), value 0
Event: time 1725350829.305761, -------------- SYN_REPORT ------------</code></pre>
<h5>Return 按键：烧录功能</h5>
<p>长按 Return 按键，上电3s 后进入烧录模式。</p>