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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-source_sink_function.dita" > Edit online< / a > < / span > < h1 class = "- topic/title title topictitle1" id = "ariaid-title1" > SourceSink Function< / h1 > < div class = "date inPage" > 24 Jan 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 = "d296975e22__20250121171801" > < code class = "+ topic/ph pr-d/codeph ph codeph" > SourceSink Function< / code > 的主要功能是提供了一组 USB 测试 endpoint， < / p > < ul class = "- topic/ul ul" id = "usb_source_sink_function__ul_vjq_zjz_21c" data-ofbid = "usb_source_sink_function__ul_vjq_zjz_21c" > < li class = "- topic/li li" data-ofbid = "d296975e27__20250121171801" >
< p class = "- topic/p p" data-ofbid = "d296975e29__20250121171801" > < code class = "+ topic/ph pr-d/codeph ph codeph" > Sink< / code > 。sinks bulk packets OUT to the peripheral。意思是把数据从 Host 引流到
Device， < code class = "+ topic/ph pr-d/codeph ph codeph" > OUT< / code > 方向。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d296975e37__20250121171801" >
< p class = "- topic/p p" data-ofbid = "d296975e39__20250121171801" > < code class = "+ topic/ph pr-d/codeph ph codeph" > Source< / code > 。sources them IN to the host。意思是把从 Device 发送数据到 Device，
< code class = "+ topic/ph pr-d/codeph ph codeph" > IN< / code > 方向。< / p >
< / li > < / ul > < p class = "- topic/p p" data-ofbid = "d296975e47__20250121171801" > 具体提供了 4 组 测试 endpoint： < / p > < div class = "table-container" > < table class = "- topic/table table frame-all" id = "usb_source_sink_function__table_wjq_zjz_21c" data-ofbid = "usb_source_sink_function__table_wjq_zjz_21c" data-cols = "4" > < caption > < / caption > < colgroup > < col style = "width:18.231046931407946%" / > < col style = "width:18.05054151624549%" / > < col style = "width:18.953068592057765%" / > < col style = "width:44.76534296028882%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row" > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "usb_source_sink_function__table_wjq_zjz_21c__entry__1" > Endpoint< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "usb_source_sink_function__table_wjq_zjz_21c__entry__2" > Type< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "usb_source_sink_function__table_wjq_zjz_21c__entry__3" > Direction< / th > < th class = "- topic/entry entry colsep-0 rowsep-1" id = "usb_source_sink_function__table_wjq_zjz_21c__entry__4" > Descript|< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__1" > in_ep< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__2" > bulk< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__3" > IN< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__4" >
< p class = "- topic/p p" data-ofbid = "d296975e75__20250121171801" > Source 发送数据到 Host， < / p >
< p class = "- topic/p p" data-ofbid = "d296975e78__20250121171801" > 注意这数据是 Device 主动生成的< / p >
< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__1" > out_ep< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__2" > bulk< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__3" > OUT< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__4" > Sink 接收 Host 的数据< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__1" > iso_in_ep< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__2" > iso< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__3" > IN< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__4" > Source 发送数据到 Host< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__1" > iso_out_ep< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__2" > iso< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__3" > OUT< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "usb_source_sink_function__table_wjq_zjz_21c__entry__4" > Sink 接收 Host 的数据< / td > < / tr > < / tbody > < / table > < / div > < p class = "- topic/p p" data-ofbid = "d296975e108__20250121171801" > 主要流程如下：< / p > < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "usb_source_sink_function__pre_xjq_zjz_21c" data-ofbid = "usb_source_sink_function__pre_xjq_zjz_21c" > drivers\usb\gadget\function\f_sourcesink.c:
sourcesink_bind()：
< strong class = "hl-keyword" > static< / strong > < strong class = "hl-keyword" > int< / strong >
sourcesink_bind(< strong class = "hl-keyword" > struct< / strong > usb_configuration *c, < strong class = "hl-keyword" > struct< / strong > usb_function *f)
{
< em class = "hl-comment" > /* (1) 从 gadget 中分配 2 个 bulk endpoint */< / em >
< em class = "hl-comment" > /* allocate bulk endpoints */< / em >
ss-> in_ep = usb_ep_autoconfig(cdev-> gadget, & fs_source_desc);
ss-> out_ep = usb_ep_autoconfig(cdev-> gadget, & fs_sink_desc);
< em class = "hl-comment" > /* (2) 如果支持 ISO， < / em >
< em class = "hl-comment" > /* allocate iso endpoints */< / em >
ss-> iso_in_ep = usb_ep_autoconfig(cdev-> gadget, & fs_iso_source_desc);
< strong class = "hl-keyword" > if< / strong > (!ss-> iso_in_ep)
< strong class = "hl-keyword" > goto< / strong > no_iso;
ss-> iso_out_ep = usb_ep_autoconfig(cdev-> gadget, & fs_iso_sink_desc);
< strong class = "hl-keyword" > if< / strong > (!ss-> iso_out_ep) {
}
sourcesink_set_alt() → enable_source_sink() → usb_ep_enable()/source_sink_start_ep()：
< em class = "hl-comment" > // 启动上述 endpoint< / em >
→ source_sink_complete():
< em class = "hl-comment" > // urb 的 complete() 函数， < / em >
< / pre > < p class = "- topic/p p" data-ofbid = "d296975e112__20250121171801" > 还支持一些参数调整：< / p > < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "usb_source_sink_function__pre_yjq_zjz_21c" data-ofbid = "usb_source_sink_function__pre_yjq_zjz_21c" > < em class = "+ topic/ph hi-d/i ph i" > # ls functions/SourceSink.< span class = "hl-number" > 0< / span > /< / em > bulk_bufleniso_qlenisoc_maxburstisoc_multbulk_qlenisoc_intervalisoc_maxpacketpattern< / pre > < / div > < / article > < / main > < / div >
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