{"id":45210,"date":"2023-09-28T16:10:01","date_gmt":"2023-09-28T08:10:01","guid":{"rendered":"https:\/\/www.techphant.cn\/?p=45210"},"modified":"2023-09-28T16:10:01","modified_gmt":"2023-09-28T08:10:01","slug":"uddsc","status":"publish","type":"post","link":"https:\/\/www.techphant.cn\/blog\/45210.html","title":{"rendered":"USART\u7684DMA\u8f93\u51fa"},"content":{"rendered":"

  USART\uff08Universal Synchronous Asynchronous Receiver Transmitter\uff09\u662f\u4e00\u79cd\u5e38\u7528\u7684\u4e32\u884c\u901a\u4fe1\u63a5\u53e3\uff0c\u5b83\u53ef\u4ee5\u652f\u6301\u591a\u79cd\u4e0d\u540c\u7684\u6570\u636e\u4f20\u8f93\u534f\u8bae\uff0c\u5982RS-232\u3001RS-485\u548cRS-422\u3002\u5b83\u53ef\u4ee5\u5c06\u6570\u636e\u4ee5\u6bd4\u8f83\u5feb\u7684\u901f\u5ea6\u4f20\u8f93\u5230\u5176\u4ed6\u8bbe\u5907\uff0c\u5e76\u53ef\u4ee5\u4f7f\u7528DMA\uff08Direct Memory Access\uff09\u6280\u672f\u6765\u52a0\u5feb\u6570\u636e\u4f20\u8f93\u901f\u5ea6\u3002\u672c\u6587\u5c06\u4ecb\u7ecdUSART\u7684DMA\u8f93\u51fa\uff0c\u4ee5\u53ca\u5b83\u7684\u4f18\u70b9\u548c\u7f3a\u70b9\u3002<\/p>\n

\u4ec0\u4e48\u662fDMA\u8f93\u51fa\uff1f<\/h2>\n

  DMA\u8f93\u51fa\u662f\u4e00\u79cd\u53ef\u4ee5\u5c06\u6570\u636e\u4ece\u4e00\u4e2a\u8bbe\u5907\u4f20\u8f93\u5230\u53e6\u4e00\u4e2a\u8bbe\u5907\u7684\u6280\u672f\u3002\u5b83\u53ef\u4ee5\u5c06\u6570\u636e\u76f4\u63a5\u4ece\u5185\u5b58\u4e2d\u4f20\u8f93\u5230\u53e6\u4e00\u4e2a\u8bbe\u5907\uff0c\u800c\u65e0\u9700CPU\u7684\u5e72\u9884\u3002\u8fd9\u79cd\u6280\u672f\u53ef\u4ee5\u6781\u5927\u5730\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u7684\u901f\u5ea6\uff0c\u800c\u4e14\u53ef\u4ee5\u8282\u7701CPU\u7684\u8d44\u6e90\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd\u3002<\/p>\n

USART\u7684DMA\u8f93\u51fa<\/h2>\n

  USART\u53ef\u4ee5\u4f7f\u7528DMA\u6280\u672f\u6765\u4f20\u8f93\u6570\u636e\u3002DMA\u8f93\u51fa\u53ef\u4ee5\u5c06\u6570\u636e\u4ece\u5185\u5b58\u4e2d\u76f4\u63a5\u4f20\u8f93\u5230USART\uff0c\u800c\u4e0d\u9700\u8981CPU\u7684\u5e72\u9884\u3002USART\u7684DMA\u8f93\u51fa\u53ef\u4ee5\u4ee5\u6700\u9ad8\u7684\u901f\u5ea6\u4f20\u8f93\u6570\u636e\uff0c\u800c\u4e14\u53ef\u4ee5\u6781\u5927\u5730\u8282\u7701CPU\u7684\u8d44\u6e90\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd\u3002<\/p>\n

USART\u7684DMA\u8f93\u51fa\u4f18\u70b9<\/h2>\n

  1. \u9ad8\u901f\u4f20\u8f93<\/h3>\n

  \u4f7f\u7528USART\u7684DMA\u8f93\u51fa\u53ef\u4ee5\u4ee5\u6700\u9ad8\u7684\u901f\u5ea6\u4f20\u8f93\u6570\u636e\uff0c\u800c\u4e14\u53ef\u4ee5\u6781\u5927\u5730\u63d0\u9ad8\u4f20\u8f93\u7684\u6548\u7387\u3002<\/p>\n

  2. \u8282\u7701CPU\u8d44\u6e90<\/h3>\n

  \u4f7f\u7528USART\u7684DMA\u8f93\u51fa\u53ef\u4ee5\u6781\u5927\u5730\u8282\u7701CPU\u7684\u8d44\u6e90\uff0c\u56e0\u4e3a\u5b83\u4e0d\u9700\u8981CPU\u6765\u76f4\u63a5\u53c2\u4e0e\u6570\u636e\u4f20\u8f93\u3002<\/p>\n

  3. \u652f\u6301\u591a\u79cd\u6570\u636e\u4f20\u8f93\u534f\u8bae<\/h3>\n

  USART\u53ef\u4ee5\u652f\u6301\u591a\u79cd\u4e0d\u540c\u7684\u6570\u636e\u4f20\u8f93\u534f\u8bae\uff0c\u5982RS-232\u3001RS-485\u548cRS-422\uff0c\u8fd9\u4f7f\u5f97\u5b83\u53ef\u4ee5\u7528\u4e8e\u4e0d\u540c\u7684\u573a\u666f\u3002<\/p>\n

USART\u7684DMA\u8f93\u51fa\u7f3a\u70b9<\/h2>\n

  1. \u8bbe\u5907\u590d\u6742\u5ea6<\/h3>\n

  \u4f7f\u7528USART\u7684DMA\u8f93\u51fa\u9700\u8981\u989d\u5916\u7684\u786c\u4ef6\uff0c\u8fd9\u4f1a\u589e\u52a0\u8bbe\u5907\u7684\u590d\u6742\u5ea6\u548c\u6210\u672c\u3002<\/p>\n

  2. \u6570\u636e\u5b89\u5168\u6027<\/h3>\n

  \u7531\u4e8eUSART\u7684DMA\u8f93\u51fa\u4e0d\u9700\u8981CPU\u53c2\u4e0e\uff0c\u6240\u4ee5\u6570\u636e\u7684\u5b89\u5168\u6027\u53ef\u80fd\u4f1a\u53d7\u5230\u5f71\u54cd\u3002<\/p>\n

\u603b\u7ed3<\/h2>\n

  USART\u7684DMA\u8f93\u51fa\u662f\u4e00\u79cd\u53ef\u4ee5\u6781\u5927\u5730\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u901f\u5ea6\u548c\u8282\u7701CPU\u8d44\u6e90\u7684\u6280\u672f\u3002<\/strong>\u5b83\u53ef\u4ee5\u652f\u6301\u591a\u79cd\u4e0d\u540c\u7684\u6570\u636e\u4f20\u8f93\u534f\u8bae\uff0c\u4f46\u662f\u4e5f\u4f1a\u589e\u52a0\u8bbe\u5907\u7684\u590d\u6742\u5ea6\u548c\u6210\u672c\uff0c\u5e76\u53ef\u80fd\u4f1a\u5f71\u54cd\u6570\u636e\u7684\u5b89\u5168\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

USART\uff08UniversalSynchronousAsynchronousReceiverTransmitter\uff09\u662f\u4e00\u79cd\u5e38\u7528\u7684\u4e32\u884c\u901a\u4fe1\u63a5\u53e3\uff0c\u5b83\u53ef\u4ee5\u652f\u6301\u591a\u79cd\u4e0d\u540c\u7684<\/p>\n","protected":false},"author":1,"featured_media":4132,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-global-header-display":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","footnotes":""},"categories":[36],"tags":[305],"class_list":["post-45210","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-dzjs"],"_links":{"self":[{"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/posts\/45210"}],"collection":[{"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/comments?post=45210"}],"version-history":[{"count":0,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/posts\/45210\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/media\/4132"}],"wp:attachment":[{"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/media?parent=45210"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/categories?post=45210"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/tags?post=45210"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}