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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/sdmc/sdmc-interrupt-processing-procedures.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">中断处理流程</h1><div class="date inPage">15 Jul 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d195601e23__20250121171632">在触发中断后，需要根据目前的中断状态进行处理，其中主要为错误处理和传输处理，这些处理主要在 tasklet 中，并且基于一些状态变量来控制处理的流程。</p><ol class="- topic/ol ol" id="sdmc_interrupt_processing_procedures__ol_k5n_mst_c1c" data-ofbid="sdmc_interrupt_processing_procedures__ol_k5n_mst_c1c"><li class="- topic/li li" data-ofbid="d195601e26__20250121171632">状态变量。在流程的控制上，主要通过几个状态变量来控制：<ul class="- topic/ul ul" id="sdmc_interrupt_processing_procedures__ul_m5n_mst_c1c" data-ofbid="sdmc_interrupt_processing_procedures__ul_m5n_mst_c1c"><li class="- topic/li li" data-ofbid="d195601e29__20250121171632">
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<p class="- topic/p p" data-ofbid="d195601e31__20250121171632">host-> state：表示当前的操作状态，例如发送数据，发送 CMD 等等</p>
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</li><li class="- topic/li li" data-ofbid="d195601e34__20250121171632">
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<p class="- topic/p p" data-ofbid="d195601e36__20250121171632">host->pending_events：当前中断发生的状态</p>
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</li><li class="- topic/li li" data-ofbid="d195601e39__20250121171632">
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<p class="- topic/p p" data-ofbid="d195601e41__20250121171632">host->completed_events：当前完成的状态，例如 CMD 完成，DATA 完成等</p>
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</li><li class="- topic/li li" data-ofbid="d195601e44__20250121171632">
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<p class="- topic/p p" data-ofbid="d195601e46__20250121171632">host->cmd_status：发送 CMD 时中断的状态</p>
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</li><li class="- topic/li li" data-ofbid="d195601e49__20250121171632">
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<p class="- topic/p p" data-ofbid="d195601e51__20250121171632">host->data_status：传输数据时中断的状态</p>
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</li></ul></li><li class="- topic/li li" data-ofbid="d195601e54__20250121171632">传输处理<ul class="- topic/ul ul" id="sdmc_interrupt_processing_procedures__ul_o5n_mst_c1c" data-ofbid="sdmc_interrupt_processing_procedures__ul_o5n_mst_c1c"><li class="- topic/li li" data-ofbid="d195601e57__20250121171632">
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<p class="- topic/p p" data-ofbid="d195601e59__20250121171632">当 CMD 发送完成中断触发后，会在 tasklet 中调用函数 complete，该函数中会读取外部 SD 设备返回给控制器的 response
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数据，再根据当前的 CMD 状态对 CMD 的结果进行赋值。</p>
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</li><li class="- topic/li li" data-ofbid="d195601e62__20250121171632">
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<p class="- topic/p p" data-ofbid="d195601e64__20250121171632">如果使用的是 PIO 的方式，当 TX/RX FIFO 请求中断响应后，会调用对应的函数对 FIFO 进行读写操作。</p>
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</li><li class="- topic/li li" data-ofbid="d195601e67__20250121171632">
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<p class="- topic/p p" data-ofbid="d195601e69__20250121171632">若是采用 DMA 的方式，则在中断函数中读取内部 DMA 状态，然后释放 DMA 传输的资源，再根据 DMA 的状态，在 tsaklet 中调用
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artinchip_mmc_data_complete 函数，该函数会根据目前的数据传输情况对传输结果进行赋值。</p>
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</li></ul></li><li class="- topic/li li" data-ofbid="d195601e72__20250121171632">错误处理。目前 SDMC 支持的错误中断类型包括：<ul class="- topic/ul ul" id="sdmc_interrupt_processing_procedures__ul_q5n_mst_c1c" data-ofbid="sdmc_interrupt_processing_procedures__ul_q5n_mst_c1c"><li class="- topic/li li" data-ofbid="d195601e75__20250121171632">CMD 错误中断<p class="- topic/p p" data-ofbid="d195601e77__20250121171632">当出现 CMD 错误中断后，在中断处理函数中，会将当前中断寄存器的状态保存，然后设置 cmd 的状态为已经完成，最后在 complete 函数中将 CMD 的结果进行赋值。</p></li><li class="- topic/li li" data-ofbid="d195601e79__20250121171632">DATA 错误中断<p class="- topic/p p" data-ofbid="d195601e81__20250121171632">当出现 DATA 中断后，在中断处理函数中会将当前的中断状态保存，然后设置 data 的状态为 DATA 错误，然后切入到
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tasklet 函数中，在该函数中，根据 DATA 错误的状态，停止 dma，如果有需求，就发送 stop 命令。</p></li></ul></li></ol></div></article></main></div>
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