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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" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/usb/usb-packet_135_setup_data.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Packet 135 (Setup Data)</h1><div class="date inPage">3 Dec 2024</div><div style="color: gray;">
Read time: 1 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d37391e22__20250121171516">主要分析一下第二个包数据包中的 DATA 字段包含的就是命令。Data 中总共有 8 字节,每字节的含义如下 (USB 协议报文是小端模式)</p><div class="- topic/p p" data-ofbid="d37391e24__20250121171516"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_packet_135_setup_data__image_f2p_hgq_g1c" src="../../../images/usb/setup_data_format.png" alt="image24"/></div><br/></div><div class="- topic/p p" data-ofbid="d37391e28__20250121171516">在 Linux kernel
中,使用一个结构体来表示:<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_packet_135_setup_data__codeblock_bsw_wsq_g1c" data-ofbid="usb_packet_135_setup_data__codeblock_bsw_wsq_g1c"><strong class="hl-keyword">struct</strong> usb_ctrlrequest {
__u8 bRequestType;
__u8 bRequest;
__le16 wValue;
__le16 wIndex;
__le16 wLength;
} __attribute__ ((packed));</pre></div><ul class="- topic/ul ul" id="usb_packet_135_setup_data__ul_h2p_hgq_g1c" data-ofbid="usb_packet_135_setup_data__ul_h2p_hgq_g1c"><li class="- topic/li li" data-ofbid="d37391e33__20250121171516">
<p class="- topic/p p" data-ofbid="d37391e35__20250121171516">bmRequestType</p>
<div class="table-container"><table class="- topic/table table frame-all" id="usb_packet_135_setup_data__table_i2p_hgq_g1c" data-ofbid="usb_packet_135_setup_data__table_i2p_hgq_g1c" data-cols="5"><caption></caption><colgroup><col style="width:8%"/><col style="width:17.333333333333336%"/><col style="width:8%"/><col style="width:13.333333333333334%"/><col style="width:53.333333333333336%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__1">Offset</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__2">Field</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__3">Size</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__4">Value</th><th class="- topic/entry entry colsep-0 rowsep-1" id="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__5">Description</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__1">0</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__2">bmRequestType</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__3">1</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__4">0x80</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="usb_packet_135_setup_data__table_i2p_hgq_g1c__entry__5">表示 期望的数据传输方向为 设备传输给主机,这条 命令的接收者为设备。</td></tr></tbody></table></div>
</li><li class="- topic/li li" data-ofbid="d37391e70__20250121171516">
<p class="- topic/p p" data-ofbid="d37391e72__20250121171516">bRequest</p>
<div class="table-container"><table class="- topic/table table frame-all" id="usb_packet_135_setup_data__table_k2p_hgq_g1c" data-ofbid="usb_packet_135_setup_data__table_k2p_hgq_g1c" data-cols="5"><caption></caption><colgroup><col style="width:8%"/><col style="width:17.333333333333336%"/><col style="width:8%"/><col style="width:13.333333333333334%"/><col style="width:53.333333333333336%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__1">Offset</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__2">Field</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__3">Size</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__4">Value</th><th class="- topic/entry entry colsep-0 rowsep-1" id="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__5">Description</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__1">1</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__2">bmRequest</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__3">1</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__4">0x06</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="usb_packet_135_setup_data__table_k2p_hgq_g1c__entry__5">代表了 一个命令,根据 <code class="+ topic/ph pr-d/codeph ph codeph">Table 9-4</code> 可以得知代表的命令为获取描述符
<code class="+ topic/ph pr-d/codeph ph codeph">GET_DESCRIPTOR</code></td></tr></tbody></table></div>
<div class="- topic/p p" data-ofbid="d37391e112__20250121171516"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_packet_135_setup_data__image_l2p_hgq_g1c" src="../../../images/usb/setup_data_brequest.png" alt="image25"/></div><br/></div>
</li><li class="- topic/li li" data-ofbid="d37391e117__20250121171516">
<p class="- topic/p p" data-ofbid="d37391e119__20250121171516">wValue</p>
<div class="table-container"><table class="- topic/table table frame-all" id="usb_packet_135_setup_data__table_n2p_hgq_g1c" data-ofbid="usb_packet_135_setup_data__table_n2p_hgq_g1c" data-cols="5"><caption></caption><colgroup><col style="width:8%"/><col style="width:17.333333333333336%"/><col style="width:8%"/><col style="width:13.333333333333334%"/><col style="width:53.333333333333336%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__1">Offset</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__2">Field</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__3">Size</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__4">Value</th><th class="- topic/entry entry colsep-0 rowsep-1" id="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__5">Description</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__1">2</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__2">wValue</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__3">2</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__4">0x00 0x01</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__5">根据 <code class="+ topic/ph pr-d/codeph ph codeph">Table 9-3</code> 可以得知,此时代表的是: <code class="+ topic/ph pr-d/codeph ph codeph">Descriptor
Type</code> + <code class="+ topic/ph pr-d/codeph ph codeph">Descriptor Index</code></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__1">2</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__2"><code class="+ topic/ph pr-d/codeph ph codeph">Descriptor Index</code></td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__3">1</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__4">0x00</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__5">想要获取的描述符 index 为 0</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__1">3</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__2"><code class="+ topic/ph pr-d/codeph ph codeph">Descriptor Type</code></td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__3">1</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__4">0x01</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="usb_packet_135_setup_data__table_n2p_hgq_g1c__entry__5">根据 <code class="+ topic/ph pr-d/codeph ph codeph">Table 9-5</code> 可以得知,想要获取的描述 符为``Device
Descriptor``</td></tr></tbody></table></div>
<div class="- topic/p p" data-ofbid="d37391e189__20250121171516"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_packet_135_setup_data__image_o2p_hgq_g1c" src="../../../images/usb/standard_device_requests.png" alt="image26"/></div><br/></div>
<div class="- topic/p p" data-ofbid="d37391e194__20250121171516"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_packet_135_setup_data__image_p2p_hgq_g1c" src="../../../images/usb/setup_descriptor_types.png" alt="image27"/></div><br/></div>
</li><li class="- topic/li li" data-ofbid="d37391e199__20250121171516">
<p class="- topic/p p" data-ofbid="d37391e201__20250121171516">wIndex</p>
<div class="table-container"><table class="- topic/table table frame-all" id="usb_packet_135_setup_data__table_r2p_hgq_g1c" data-ofbid="usb_packet_135_setup_data__table_r2p_hgq_g1c" data-cols="5"><caption></caption><colgroup><col style="width:8%"/><col style="width:17.333333333333336%"/><col style="width:8%"/><col style="width:13.333333333333334%"/><col style="width:53.333333333333336%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__1">Offset</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__2">Field</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__3">Size</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__4">Value</th><th class="- topic/entry entry colsep-0 rowsep-1" id="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__5">Description</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__1">4</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__2">wIndex</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__3">2</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__4">0x00 0x00</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="usb_packet_135_setup_data__table_r2p_hgq_g1c__entry__5">根据 <code class="+ topic/ph pr-d/codeph ph codeph">Table 9-3</code> 可以 得知,此时代表的是:
<code class="+ topic/ph pr-d/codeph ph codeph">Zero</code> or <code class="+ topic/ph pr-d/codeph ph codeph">Language
ID</code></td></tr></tbody></table></div>
</li><li class="- topic/li li" data-ofbid="d37391e244__20250121171516">
<p class="- topic/p p" data-ofbid="d37391e246__20250121171516">wLength</p>
<div class="table-container"><table class="- topic/table table frame-all" id="usb_packet_135_setup_data__table_t2p_hgq_g1c" data-ofbid="usb_packet_135_setup_data__table_t2p_hgq_g1c" data-cols="5"><caption></caption><colgroup><col style="width:8%"/><col style="width:17.333333333333336%"/><col style="width:8%"/><col style="width:13.333333333333334%"/><col style="width:53.333333333333336%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__1">Offset</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__2">Field</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__3">Size</th><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__4">Value</th><th class="- topic/entry entry colsep-0 rowsep-1" id="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__5">Description</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__1">6</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__2">wLength</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__3">2</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__4">0x40 0x00</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="usb_packet_135_setup_data__table_t2p_hgq_g1c__entry__5">根据 <code class="+ topic/ph pr-d/codeph ph codeph">Table 9-3</code> 可以得知,此时代表的是:
<code class="+ topic/ph pr-d/codeph ph codeph">Description Length</code> 即:请求 Device 发送
<code class="+ topic/ph pr-d/codeph ph codeph">Device Descriptor</code> 的 前 64 个字节</td></tr></tbody></table></div>
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