{"id":44386,"date":"2023-09-30T10:47:55","date_gmt":"2023-09-30T02:47:55","guid":{"rendered":"https:\/\/www.techphant.cn\/?p=44386"},"modified":"2023-09-30T10:47:55","modified_gmt":"2023-09-30T02:47:55","slug":"sydzdfl","status":"publish","type":"post","link":"https:\/\/www.techphant.cn\/blog\/44386.html","title":{"rendered":"\u4f7f\u7528DMA\u4e2d\u65ad\u8303\u4f8b"},"content":{"rendered":"<p>&emsp;&emsp;DMA\uff08Direct Memory Access\uff09\u4e2d\u65ad\u662f\u4e00\u79cd\u66f4\u52a0\u9ad8\u6548\u7684\u6570\u636e\u4f20\u8f93\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u7528\u6237\u5feb\u901f\u5730\u5c06\u6570\u636e\u4ece\u4e00\u4e2a\u5730\u65b9\u4f20\u8f93\u5230\u53e6\u4e00\u4e2a\u5730\u65b9\uff0c\u800c\u65e0\u9700\u4f7f\u7528CPU\u7684\u5904\u7406\u80fd\u529b\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528DMA\u4e2d\u65ad\u6765\u5b9e\u73b0\u8fd9\u79cd\u9ad8\u6548\u7684\u6570\u636e\u4f20\u8f93\u3002<\/p>\n<h2 style=\"text-align: center;\">\u4ec0\u4e48\u662fDMA\u4e2d\u65ad\uff1f<\/h2>\n<p>&emsp;&emsp;<strong>DMA\u4e2d\u65ad\u662f\u4e00\u79cd\u66f4\u52a0\u9ad8\u6548\u7684\u6570\u636e\u4f20\u8f93\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u7528\u6237\u5feb\u901f\u5730\u5c06\u6570\u636e\u4ece\u4e00\u4e2a\u5730\u65b9\u4f20\u8f93\u5230\u53e6\u4e00\u4e2a\u5730\u65b9\uff0c\u800c\u65e0\u9700\u4f7f\u7528CPU\u7684\u5904\u7406\u80fd\u529b\u3002<\/strong>\u5b83\u53ef\u4ee5\u5728\u591a\u4e2a\u8bbe\u5907\u4e4b\u95f4\u8fdb\u884c\u6570\u636e\u4f20\u8f93\uff0c\u4ece\u800c\u5927\u5927\u51cf\u5c11\u5bf9CPU\u7684\u4f7f\u7528\u3002<\/p>\n<h3>&emsp;&emsp;DMA\u4e2d\u65ad\u7684\u4f18\u52bf<\/h3>\n<ul>\n<li>\u6570\u636e\u4f20\u8f93\u901f\u5ea6\u5feb\uff1aDMA\u4e2d\u65ad\u53ef\u4ee5\u5c06\u6570\u636e\u4ece\u4e00\u4e2a\u5730\u65b9\u4f20\u8f93\u5230\u53e6\u4e00\u4e2a\u5730\u65b9\uff0c\u800c\u65e0\u9700\u4f7f\u7528CPU\u7684\u5904\u7406\u80fd\u529b\uff0c\u4ece\u800c\u5927\u5927\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u901f\u5ea6\u3002<\/li>\n<li>\u51cf\u5c11CPU\u7684\u4f7f\u7528\uff1a\u7531\u4e8eDMA\u4e2d\u65ad\u53ef\u4ee5\u5728\u591a\u4e2a\u8bbe\u5907\u4e4b\u95f4\u8fdb\u884c\u6570\u636e\u4f20\u8f93\uff0c\u56e0\u6b64\u53ef\u4ee5\u51cf\u5c11\u5bf9CPU\u7684\u4f7f\u7528\u3002<\/li>\n<li>\u63d0\u9ad8\u7cfb\u7edf\u6548\u7387\uff1aDMA\u4e2d\u65ad\u53ef\u4ee5\u5e2e\u52a9\u7528\u6237\u66f4\u5feb\u5730\u5b8c\u6210\u5de5\u4f5c\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6548\u7387\u3002<\/li>\n<\/ul>\n<h2 style=\"text-align: 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style=\"text-align: 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