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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1">
<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/usb/usb-device_gadget_zero.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Device 侧 gadget zero</h1>
<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
Read time: 6 minute(s)
</div>
<div class="- topic/body concept/conbody body conbody">
<p class="- topic/p p" data-ofbid="d202576e33__20250123155222">提供测试需要的 Device 设备有很多种方式，例如可用使用专门的测试 Device 里面烧录专有的测试 Firmware。节约成本的方式还是使用 Linux gadget
功能来动态模拟 USB Device 设备。针对 USB 测试，Linux 专门提供了 <code class="+ topic/ph pr-d/codeph ph codeph">gadget zero</code> 设备。</p>
<section class="- topic/section section" id="usb_device_gadget_zero__section_apx_wjz_21c" data-ofbid="usb_device_gadget_zero__section_apx_wjz_21c"><h2 class="- topic/title title sectiontitle">Device 创建</h2>
<p class="- topic/p p" data-ofbid="d202576e44__20250123155222"><code class="+ topic/ph pr-d/codeph ph codeph">gadget zero</code> 的核心是创建一个 <code class="+ topic/ph pr-d/codeph ph codeph">Composite Device</code> ，其包含了两个
<code class="+ topic/ph pr-d/codeph ph codeph">Configuration</code> ，其中一个 <code class="+ topic/ph pr-d/codeph ph codeph">Configuration 0</code> 包含
<code class="+ topic/ph pr-d/codeph ph codeph">SourceSink Function/Interface</code> ，另一个 <code class="+ topic/ph pr-d/codeph ph codeph">Configuration
1</code> 包含 <code class="+ topic/ph pr-d/codeph ph codeph">Loopback Function/Interface</code> 。某一时刻只能选择使用一个
<code class="+ topic/ph pr-d/codeph ph codeph">Configuration</code> ，通常情况下使用 <code class="+ topic/ph pr-d/codeph ph codeph">Configuration 0</code> 即
<code class="+ topic/ph pr-d/codeph ph codeph">SourceSink</code> 的功能。</p>
<p class="- topic/p p" data-ofbid="d202576e77__20250123155222"><code class="+ topic/ph pr-d/codeph ph codeph">gadget zero</code> Device 由两种方式创建：</p>
<ul class="- topic/ul ul" id="usb_device_gadget_zero__ul_bpx_wjz_21c" data-ofbid="usb_device_gadget_zero__ul_bpx_wjz_21c">
<li class="- topic/li li" data-ofbid="d202576e84__20250123155222">
<p class="- topic/p p" data-ofbid="d202576e86__20250123155222">1、通过 <code class="+ topic/ph pr-d/codeph ph codeph">zero_driver</code> 创建，只要把对应驱动文件
<code class="+ topic/ph pr-d/codeph ph codeph">drivers\usb\gadget\legacy\zero.c</code> 编译进内核即可。</p>
</li>
<li class="- topic/li li" data-ofbid="d202576e96__20250123155222">
<div class="- topic/p p" data-ofbid="d202576e98__20250123155222">2、通过 <code class="+ topic/ph pr-d/codeph ph codeph">functionfs</code>
动态创建，这种方式更灵活，实例命令如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_device_gadget_zero__pre_cpx_wjz_21c" data-ofbid="usb_device_gadget_zero__pre_cpx_wjz_21c"><code>mount -t configfs none /sys/kernel/config
cd /sys/kernel/config/usb_gadget
mkdir g2
cd g2
echo <span class="hl-string">"0x04e8"</span> &gt; idVendor
echo <span class="hl-string">"0x2d01"</span> &gt; idProduct
mkdir configs/c.<span class="hl-number">1</span>
mkdir configs/c.<span class="hl-number">2</span>
mkdir functions/Loopback.<span class="hl-number">0</span>
mkdir functions/SourceSink.<span class="hl-number">0</span>
mkdir strings/<span class="hl-number">0x409</span>
mkdir configs/c.<span class="hl-number">1</span>/strings/<span class="hl-number">0x409</span>
mkdir configs/c.<span class="hl-number">2</span>/strings/<span class="hl-number">0x409</span>
echo <span class="hl-string">"0x0525"</span> &gt; idVendor
echo <span class="hl-string">"0xa4a0"</span> &gt; idProduct
echo <span class="hl-string">"0123456789"</span> &gt; strings/<span class="hl-number">0x409</span>/serialnumber
echo <span class="hl-string">"Samsung Inc."</span> &gt; strings/<span class="hl-number">0x409</span>/manufacturer
echo <span class="hl-string">"Bar Gadget"</span> &gt; strings/<span class="hl-number">0x409</span>/product
echo <span class="hl-string">"Conf 1"</span> &gt; configs/c.<span class="hl-number">1</span>/strings/<span class="hl-number">0x409</span>/configuration
echo <span class="hl-string">"Conf 2"</span> &gt; configs/c.<span class="hl-number">2</span>/strings/<span class="hl-number">0x409</span>/configuration
echo <span class="hl-number">120</span> &gt; configs/c.<span class="hl-number">1</span>/MaxPower
<em class="hl-comment">// SourceSink：驱动 set configuration 会选取 第一个 configuration</em>
ln -s functions/Loopback.<span class="hl-number">0</span> configs/c.<span class="hl-number">2</span>
ln -s functions/SourceSink.<span class="hl-number">0</span> configs/c.<span class="hl-number">1</span>
echo <span class="hl-number">4100000.u</span>dc-controller &gt; UDC
</code></pre></div>
</li>
</ul>
<div class="- topic/p p" data-ofbid="d202576e108__20250123155222">整个过程就是创建了一个 <code class="+ topic/ph pr-d/codeph ph codeph">Vendor ID = 0x0525</code> 、 <code class="+ topic/ph pr-d/codeph ph codeph">Product ID =
0xa4a0</code> 的 <code class="+ topic/ph pr-d/codeph ph codeph">Composite Device</code> ，在 Host
侧可以查看这个设备：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_device_gadget_zero__pre_dpx_wjz_21c" data-ofbid="usb_device_gadget_zero__pre_dpx_wjz_21c"><code>lsusb -s <span class="hl-number">1</span>:<span class="hl-number">3</span></code></pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_device_gadget_zero__codeblock_rdx_qyr_5dc" data-ofbid="usb_device_gadget_zero__codeblock_rdx_qyr_5dc"><code>Bus <span class="hl-number">001</span> Device <span class="hl-number">003</span>: ID <span class="hl-number">0525</span>:a4a0 Netchip Technology, Inc. Linux-USB <span class="hl-string">"Gadget Zero"</span></code></pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_device_gadget_zero__codeblock_jj1_ryr_5dc" data-ofbid="usb_device_gadget_zero__codeblock_jj1_ryr_5dc"><code>lsusb -v -s <span class="hl-number">1</span>:<span class="hl-number">3</span></code></pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_device_gadget_zero__codeblock_chh_ryr_5dc" data-ofbid="usb_device_gadget_zero__codeblock_chh_ryr_5dc"><code>Bus <span class="hl-number">001</span> Device <span class="hl-number">003</span>: ID <span class="hl-number">0525</span>:a4a0 Netchip Technology, Inc. Linux-USB <span class="hl-string">"Gadget Zero"</span>
Couldn<span class="hl-string">'t open device, some information will be missing
</span>Device Descriptor:
bLength <span class="hl-number">18</span>
bDescriptorType <span class="hl-number">1</span>
bcdUSB <span class="hl-number">2.00</span>
bDeviceClass <span class="hl-number">0</span>
bDeviceSubClass <span class="hl-number">0</span>
bDeviceProtocol <span class="hl-number">0</span>
bMaxPacketSize0 <span class="hl-number">64</span>
idVendor <span class="hl-number">0x0525</span> Netchip Technology, Inc.
idProduct <span class="hl-number">0xa4a0</span> Linux-USB <span class="hl-string">"Gadget Zero"</span>
bcdDevice <span class="hl-number">5.10</span>
iManufacturer <span class="hl-number">1</span>
iProduct <span class="hl-number">2</span>
iSerial <span class="hl-number">3</span>
bNumConfigurations <span class="hl-number">2</span>
Configuration Descriptor:
bLength <span class="hl-number">9</span>
bDescriptorType <span class="hl-number">2</span>
wTotalLength <span class="hl-number">0x0045</span>
bNumInterfaces <span class="hl-number">1</span>
bConfigurationValue <span class="hl-number">1</span>
iConfiguration <span class="hl-number">4</span>
bmAttributes <span class="hl-number">0x80</span>
(Bus Powered)
MaxPower <span class="hl-number">120</span>mA
Interface Descriptor:
bLength <span class="hl-number">9</span>
bDescriptorType <span class="hl-number">4</span>
bInterfaceNumber <span class="hl-number">0</span>
bAlternateSetting <span class="hl-number">0</span>
bNumEndpoints <span class="hl-number">2</span>
bInterfaceClass <span class="hl-number">255</span> Vendor Specific Class
bInterfaceSubClass <span class="hl-number">0</span>
bInterfaceProtocol <span class="hl-number">0</span>
iInterface <span class="hl-number">0</span>
Endpoint Descriptor:
bLength <span class="hl-number">7</span>
bDescriptorType <span class="hl-number">5</span>
bEndpointAddress <span class="hl-number">0x81</span> EP <span class="hl-number">1</span> IN
bmAttributes <span class="hl-number">2</span>
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize <span class="hl-number">0x0200</span> <span class="hl-number">1</span>x <span class="hl-number">512</span> bytes
bInterval <span class="hl-number">0</span>
Endpoint Descriptor:
bLength <span class="hl-number">7</span>
bDescriptorType <span class="hl-number">5</span>
bEndpointAddress <span class="hl-number">0x01</span> EP <span class="hl-number">1</span> OUT
bmAttributes <span class="hl-number">2</span>
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize <span class="hl-number">0x0200</span> <span class="hl-number">1</span>x <span class="hl-number">512</span> bytes
bInterval <span class="hl-number">0</span>
Interface Descriptor:
bLength <span class="hl-number">9</span>
bDescriptorType <span class="hl-number">4</span>
bInterfaceNumber <span class="hl-number">0</span>
bAlternateSetting <span class="hl-number">1</span>
bNumEndpoints <span class="hl-number">4</span>
bInterfaceClass <span class="hl-number">255</span> Vendor Specific Class
bInterfaceSubClass <span class="hl-number">0</span>
bInterfaceProtocol <span class="hl-number">0</span>
iInterface <span class="hl-number">0</span>
Endpoint Descriptor:
bLength <span class="hl-number">7</span>
bDescriptorType <span class="hl-number">5</span>
bEndpointAddress <span class="hl-number">0x81</span> EP <span class="hl-number">1</span> IN
bmAttributes <span class="hl-number">2</span>
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize <span class="hl-number">0x0200</span> <span class="hl-number">1</span>x <span class="hl-number">512</span> bytes
bInterval <span class="hl-number">0</span>
Endpoint Descriptor:
bLength <span class="hl-number">7</span>
bDescriptorType <span class="hl-number">5</span>
bEndpointAddress <span class="hl-number">0x01</span> EP <span class="hl-number">1</span> OUT
bmAttributes <span class="hl-number">2</span>
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize <span class="hl-number">0x0200</span> <span class="hl-number">1</span>x <span class="hl-number">512</span> bytes
bInterval <span class="hl-number">0</span>
Endpoint Descriptor:
bLength <span class="hl-number">7</span>
bDescriptorType <span class="hl-number">5</span>
bEndpointAddress <span class="hl-number">0x82</span> EP <span class="hl-number">2</span> IN
bmAttributes <span class="hl-number">1</span>
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize <span class="hl-number">0x0400</span> <span class="hl-number">1</span>x <span class="hl-number">1024</span> bytes
bInterval <span class="hl-number">4</span>
Endpoint Descriptor:
bLength <span class="hl-number">7</span>
bDescriptorType <span class="hl-number">5</span>
bEndpointAddress <span class="hl-number">0x02</span> EP <span class="hl-number">2</span> OUT
bmAttributes <span class="hl-number">1</span>
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize <span class="hl-number">0x0400</span> <span class="hl-number">1</span>x <span class="hl-number">1024</span> bytes
bInterval <span class="hl-number">4</span>
Configuration Descriptor:
bLength <span class="hl-number">9</span>
bDescriptorType <span class="hl-number">2</span>
wTotalLength <span class="hl-number">0x0020</span>
bNumInterfaces <span class="hl-number">1</span>
bConfigurationValue <span class="hl-number">2</span>
iConfiguration <span class="hl-number">5</span>
bmAttributes <span class="hl-number">0x80</span>
(Bus Powered)
MaxPower <span class="hl-number">2</span>mA
Interface Descriptor:
bLength <span class="hl-number">9</span>
bDescriptorType <span class="hl-number">4</span>
bInterfaceNumber <span class="hl-number">0</span>
bAlternateSetting <span class="hl-number">0</span>
bNumEndpoints <span class="hl-number">2</span>
bInterfaceClass <span class="hl-number">255</span> Vendor Specific Class
bInterfaceSubClass <span class="hl-number">0</span>
bInterfaceProtocol <span class="hl-number">0</span>
iInterface <span class="hl-number">6</span>
Endpoint Descriptor:
bLength <span class="hl-number">7</span>
bDescriptorType <span class="hl-number">5</span>
bEndpointAddress <span class="hl-number">0x81</span> EP <span class="hl-number">1</span> IN
bmAttributes <span class="hl-number">2</span>
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize <span class="hl-number">0x0200</span> <span class="hl-number">1</span>x <span class="hl-number">512</span> bytes
bInterval <span class="hl-number">0</span>
Endpoint Descriptor:
bLength <span class="hl-number">7</span>
bDescriptorType <span class="hl-number">5</span>
bEndpointAddress <span class="hl-number">0x01</span> EP <span class="hl-number">1</span> OUT
bmAttributes <span class="hl-number">2</span>
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize <span class="hl-number">0x0200</span> <span class="hl-number">1</span>x <span class="hl-number">512</span> bytes
bInterval <span class="hl-number">0</span></code></pre></div>
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