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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/ve/ve-key_procedure.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1><div class="date inPage">14 Nov 2024</div><div style="color: gray;">
Read time: 1 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="ve_key_procedure__section_oqc_vhb_d1c" data-ofbid="ve_key_procedure__section_oqc_vhb_d1c"><h2 class="- topic/title title sectiontitle">中断处理流程</h2>
<p class="- topic/p p" data-ofbid="d122837e28__20250121171559">VE 中断类型有三种，包括：</p>
<ul class="- topic/ul ul" id="ve_key_procedure__ul_pqc_vhb_d1c" data-ofbid="ve_key_procedure__ul_pqc_vhb_d1c"><li class="- topic/li li" data-ofbid="d122837e32__20250121171559">
<p class="- topic/p p" data-ofbid="d122837e34__20250121171559">finish 中断：VE 任务正常结束</p>
</li><li class="- topic/li li" data-ofbid="d122837e37__20250121171559">
<p class="- topic/p p" data-ofbid="d122837e39__20250121171559">error 中断：VE 处理任务过程中出错</p>
</li><li class="- topic/li li" data-ofbid="d122837e42__20250121171559">
<p class="- topic/p p" data-ofbid="d122837e44__20250121171559">bit request 中断：当前数据不足以完成一次完整的任务，需要继续发送数据</p>
</li></ul>
<div class="- topic/p p" data-ofbid="d122837e48__20250121171559"><ul class="- topic/ul ul" id="ve_key_procedure__ul_afm_zhb_d1c" data-ofbid="ve_key_procedure__ul_afm_zhb_d1c"><li class="- topic/li li" data-ofbid="d122837e50__20250121171559"><span class="- topic/ph ph">上层程序对 VE 中断的处理 </span><ul class="- topic/ul ul" id="ve_key_procedure__ul_uqc_vhb_d1c" data-ofbid="ve_key_procedure__ul_uqc_vhb_d1c"><li class="- topic/li li" data-ofbid="d122837e54__20250121171559">finish 中断处理：VE 正常结束，释放 VE 硬件设备独占权限</li><li class="- topic/li li" data-ofbid="d122837e56__20250121171559">bit request 中断处理：再次发送一笔数据，重新启动 VE 执行任务，重复以上过程，直到 VE 返回 finish 或
error 中断</li><li class="- topic/li li" data-ofbid="d122837e58__20250121171559">error 中断：VE 执行出错，必须对 VE 进行硬件复位避免错误影响下次任务</li><li class="- topic/li li" data-ofbid="d122837e60__20250121171559">等中断超时：此时 VE 出现未知异常，必须对 VE 进行硬件复位</li></ul><div class="- topic/note note note note_note" id="ve_key_procedure__note_txk_whb_d1c" data-ofbid="ve_key_procedure__note_txk_whb_d1c"><span class="note__title">注：</span> 处理 bit request 中断时，不能释放 VE
硬件设备独占权限，因为两次任务处理有相关性。如果这两次任务之间执行其他任务，会影响 VE
内部状态，从而导致该次任务执行出错。</div></li></ul></div>
</section><section class="- topic/section section" id="ve_key_procedure__section_yqc_vhb_d1c" data-ofbid="ve_key_procedure__section_yqc_vhb_d1c"><h2 class="- topic/title title sectiontitle">多线程支持</h2>
<ul class="- topic/ul ul" id="ve_key_procedure__ul_jgz_t3n_f1c" data-ofbid="ve_key_procedure__ul_jgz_t3n_f1c"><li class="- topic/li li" data-ofbid="d122837e71__20250121171559">
<p class="- topic/p p" data-ofbid="d122837e73__20250121171559">VE 设备只有一个，所以同一时间只能执行一个任务。当多个线程同时操作 VE 驱动时，VE 只能分时复用。因此上层程序在操作 VE 之前，必须获得 VE
的独占权限。</p>
</li><li class="- topic/li li" data-ofbid="d122837e76__20250121171559">
<p class="- topic/p p" data-ofbid="d122837e78__20250121171559">VE 驱动通过 IOC_VE_GET_CLIENT/IOC_VE_PUT_CLIENT 这两个 drv_ve_control 接口为上层程序提供获取和释放
VE 独占权限功能。</p>
</li><li class="- topic/li li" data-ofbid="d122837e81__20250121171559">
<p class="- topic/p p" data-ofbid="d122837e83__20250121171559">为避免每个线程都执行 VE 驱动初始化等重复操作，建议用户态程序使用单例模式实现 VE 驱动调用。具体实现可参考 mpp 代码，路径为
<span class="+ topic/ph sw-d/filepath ph filepath">packages/artinchip/mpp/ve/common/ve.c</span>。</p>
</li></ul>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#ve_key_procedure__section_oqc_vhb_d1c" data-tocid="ve_key_procedure__section_oqc_vhb_d1c">中断处理流程</a></div></li><li class="section-item"><div class="section-title"><a href="#ve_key_procedure__section_yqc_vhb_d1c" data-tocid="ve_key_procedure__section_yqc_vhb_d1c">多线程支持</a></div></li></ul></div>
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