{"id":111862,"date":"2026-10-02T00:33:07","date_gmt":"2026-10-01T16:33:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/111862.html"},"modified":"2026-10-02T00:33:07","modified_gmt":"2026-10-01T16:33:07","slug":"%e3%80%90%e5%b5%8c%e5%85%a5%e5%bc%8f%e5%a4%96%e8%ae%be%e7%b2%be%e5%ad%a6%e3%80%91day15%ef%bd%9cdma%ef%bc%9a%e5%8d%8a%e6%bb%a1%e5%85%a8%e6%bb%a1%e3%80%81%e4%b9%92%e4%b9%93%e3%80%81%e4%b8%ba%e4%bb%80","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/111862.html","title":{"rendered":"\u3010\u5d4c\u5165\u5f0f\u5916\u8bbe\u7cbe\u5b66\u3011Day15\uff5cDMA\uff1a\u534a\u6ee1\u5168\u6ee1\u3001\u4e52\u4e53\u3001\u4e3a\u4ec0\u4e48\u4e22\u6570"},"content":{"rendered":"

\u3010\u5d4c\u5165\u5f0f\u5916\u8bbe\u7cbe\u5b66\u3011Day15｜DMA：\u534a\u6ee1\u5168\u6ee1\u3001\u4e52\u4e53\u3001\u4e3a\u4ec0\u4e48\u4e22\u6570<\/h2>\n

\u4eca\u5929\u89e3\u51b3：\u91c7\u96c6\u4e3a\u4ec0\u4e48\u5c3e\u90e8\u4e0d\u5bf9？\u5982\u4f55\u8ba9 CPU \u4e0d\u8ddf\u6570\u636e\u62a2\u7740\u8dd1？<\/p>\n

\n

\u76ee\u5f55<\/h3>\n
  • \u95ee\u9898 2. \u539f\u7406 3. \u4ee3\u7801 4. \u8bef\u533a 5. \u81ea\u6d4b 6. \u7b54\u6848<\/li>\n
    \n

    1. \u95ee\u9898<\/h3>\n
      \n
    • ADC\/\u4e32\u53e3\u914d\u4e86 DMA \u4ecd\u4e22\u6570<\/li>\n
    • \u5904\u7406\u6162\u4e00\u70b9，\u7f13\u51b2\u91cc\u7684\u6570\u636e\u5c31\u82b1\u6389<\/li>\n<\/ul>\n
      \n

      2. \u539f\u7406<\/h3>\n

      2.1 DMA \u5e72\u4ec0\u4e48<\/h4>\n

      \u5916\u8bbe\u548c\u5185\u5b58\u4e4b\u95f4\u76f4\u63a5\u642c\u6570\u636e，CPU \u4e0d\u7528\u4e00\u4e2a\u4e2a\u5b57\u8282\u53bb\u642c，\u53ea\u5904\u7406\u7ed3\u679c\u3002<\/p>\n

      2.2 \u4e22\u6570\u7684\u672c\u8d28<\/h4>\n

      \u7f13\u51b2\u662f\u5faa\u73af\u5199\u7684\u3002CPU \u5904\u7406\u6bd4 DMA \u5199\u5f97\u6162 \u2192 \u65e7\u6570\u636e\u8fd8\u6ca1\u7528\u5b8c\u5c31\u88ab\u8986\u76d6\u3002<\/p>\n

      2.3 \u4e52\u4e53（\u534a\u533a\u5904\u7406）<\/h4>\n

      \u628a\u5927\u7f13\u51b2\u5206\u6210\u524d\u540e\u4e24\u534a：<\/p>\n\n\u4e8b\u4ef6\u8c01\u62e5\u6709\u54ea\u534a<\/tr>\n\n\n\n
      \u534a\u6ee1（HT）<\/td>\nDMA \u5728\u5199\u540e\u534a，CPU \u5904\u7406\u524d\u534a<\/td>\n<\/tr>\n
      \u5168\u6ee1（TC）<\/td>\nDMA \u56de\u5934\u5199\u524d\u534a，CPU \u5904\u7406\u540e\u534a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u540c\u4e00\u65f6\u95f4，\u6bcf\u534a\u53ea\u5c5e\u4e8e\u4e00\u4e2a\u4eba，\u5c31\u4e0d\u4f1a\u4e92\u76f8\u8e29\u3002<\/p>\n

      2.4 \u65f6\u95f4\u6761\u4ef6（\u7528\u8bdd\u8bb0）<\/h4>\n

      \u5904\u7406\u534a\u533a\u7684\u6700\u574f\u65f6\u95f4 < \u586b\u6ee1\u534a\u533a\u7684\u65f6\u95f4（\u8fd8\u8981\u7559\u8c03\u5ea6\u4f59\u91cf）\u3002 \u505a\u4e0d\u5230\u5c31：\u52a0\u5927\u7f13\u51b2\u3001\u964d\u4f4e\u91c7\u6837\u7387\u3001\u52a0\u5feb\u7b97\u6cd5\u3002<\/p>\n

      \n

      3. \u4ee3\u7801\u793a\u4f8b<\/h3>\n

      #<\/span>include<\/span> "stm32f4xx.h"<\/span><\/span>
      \n#<\/span>include<\/span> <stdint.h><\/span><\/span><\/p>\n

      #<\/span>define<\/span> N<\/span> 1024u<\/span><\/span><\/span>
      \nstatic<\/span> uint16_t<\/span> buf[<\/span>N]<\/span>;<\/span><\/p>\n

      typedef<\/span> enum<\/span> {<\/span> EVT_NONE,<\/span> EVT_HALF,<\/span> EVT_FULL }<\/span> evt_t<\/span>;<\/span>
      \nstatic<\/span> volatile<\/span> evt_t<\/span> evt =<\/span> EVT_NONE;<\/span><\/p>\n

      void<\/span> DMA1_Stream0_IRQHandler<\/span>(<\/span>void<\/span>)<\/span>
      \n{<\/span>
      \n if<\/span> (<\/span>DMA_GetITStatus<\/span>(<\/span>DMA1_Stream0,<\/span> DMA_IT_HTIF0)<\/span> !=<\/span> RESET)<\/span> {<\/span>
      \n DMA_ClearITPendingBit<\/span>(<\/span>DMA1_Stream0,<\/span> DMA_IT_HTIF0)<\/span>;<\/span>
      \n evt =<\/span> EVT_HALF;<\/span>
      \n }<\/span>
      \n if<\/span> (<\/span>DMA_GetITStatus<\/span>(<\/span>DMA1_Stream0,<\/span> DMA_IT_TCIF0)<\/span> !=<\/span> RESET)<\/span> {<\/span>
      \n DMA_ClearITPendingBit<\/span>(<\/span>DMA1_Stream0,<\/span> DMA_IT_TCIF0)<\/span>;<\/span>
      \n evt =<\/span> EVT_FULL;<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      void<\/span> process_half<\/span>(<\/span>uint16_t<\/span> *<\/span>p,<\/span> uint32_t<\/span> n)<\/span>
      \n{<\/span>
      \n \/* \u6ee4\u6ce2\/FFT\/\u7edf\u8ba1\u2026 *\/<\/span>
      \n (<\/span>void<\/span>)<\/span>p;<\/span> (<\/span>void<\/span>)<\/span>n;<\/span>
      \n}<\/span><\/p>\n

      void<\/span> app_dma_poll<\/span>(<\/span>void<\/span>)<\/span>
      \n{<\/span>
      \n evt_t<\/span> e =<\/span> evt;<\/span><\/p>\n

      if<\/span> (<\/span>e ==<\/span> EVT_NONE)<\/span> {<\/span>
      \n return<\/span>;<\/span>
      \n }<\/span>
      \n evt =<\/span> EVT_NONE;<\/span><\/p>\n

      if<\/span> (<\/span>e ==<\/span> EVT_HALF)<\/span> {<\/span>
      \n process_half<\/span>(<\/span>&<\/span>buf[<\/span>0<\/span>]<\/span>,<\/span> N \/<\/span> 2u<\/span>)<\/span>;<\/span>
      \n }<\/span> else<\/span> {<\/span>
      \n process_half<\/span>(<\/span>&<\/span>buf[<\/span>N \/<\/span> 2u<\/span>]<\/span>,<\/span> N \/<\/span> 2u<\/span>)<\/span>;<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      \n

      4. \u5e38\u89c1\u8bef\u533a<\/h3>\n\n\u8bef\u533a\u6b63\u89e3<\/tr>\n\n\n\n\n\n
      DMA \u5c31\u6c38\u8fdc\u4e0d\u4f1a\u4e22<\/td>\n\u5904\u7406\u8ddf\u4e0d\u4e0a\u4ecd\u4f1a\u8986\u76d6<\/td>\n<\/tr>\n
      \u7f13\u51b2\u8d8a\u5c0f\u8d8a\u597d<\/td>\n\u592a\u5c0f\u6765\u4e0d\u53ca\u5904\u7406<\/td>\n<\/tr>\n
      \u8fd0\u884c\u4e2d\u968f\u4fbf\u6539 DMA \u5bc4\u5b58\u5668<\/td>\n\u5148\u505c\u901a\u9053\u518d\u6539<\/td>\n<\/tr>\n
      \u53ea\u5f00\u5168\u6ee1\u4e2d\u65ad<\/td>\n\u7528 HT\/TC \u4e52\u4e53\u66f4\u7a33<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      \n

      5. \u81ea\u6d4b<\/h3>\n
    • N=1024，HT \u548c TC \u5404\u5904\u7406\u591a\u5c11？<\/li>\n
    • \u4e52\u4e53\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898？<\/li>\n
      \n

      6. \u7b54\u6848<\/h3>\n
    • \u5404 512\u3002<\/li>\n
    • \u660e\u786e\u201c\u8fd9\u4e00\u534a\u5f52 CPU\u3001\u90a3\u4e00\u534a\u5f52 DMA\u201d，\u907f\u514d\u5199\u8bfb\u51b2\u7a81\u548c\u6495\u88c2\u3002<\/li>\n
      \n

      \u4f5c\u8005：shuifanyu \u6807\u7b7e：DMA \u4e52\u4e53 \u91c7\u96c6<\/p>\n","protected":false},"excerpt":{"rendered":"

      \u3010\u5d4c\u5165\u5f0f\u5916\u8bbe\u7cbe\u5b66\u3011Day15｜DMA：\u534a\u6ee1\u5168\u6ee1\u3001\u4e52\u4e53\u3001\u4e3a\u4ec0\u4e48\u4e22\u6570 \u4eca\u5929\u89e3\u51b3：\u91c7\u96c6\u4e3a\u4ec0\u4e48\u5c3e\u90e8\u4e0d\u5bf9？\u5982\u4f55\u8ba9 CPU \u4e0d\u8ddf\u6570\u636e\u62a2\u7740\u8dd1？ \u76ee\u5f55
      \n\u95ee\u9898 2. \u539f\u7406 3. \u4ee3\u7801 4. \u8bef\u533a 5. \u81ea\u6d4b 6. \u7b54\u6848 1. \u95ee\u9898
      \nADC\/\u4e32\u53e3\u914d\u4e86 DMA \u4ecd\u4e22\u6570\u5904\u7406\u6162\u4e00\u70b9，\u7f13\u51b2\u91cc\u7684\u6570\u636e\u5c31\u82b1\u6389 2. \u539f\u7406
      \n2.1 DMA \u5e72\u4ec0\u4e48
      \n\u5916\u8bbe\u548c\u5185\u5b58\u4e4b\u95f4\u76f4\u63a5\u642c\u6570\u636e，CPU \u4e0d\u7528\u4e00\u4e2a\u4e2a\u5b57\u8282\u53bb\u642c&#xf<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11653,217,270,5116,269,78],"topic":[],"class_list":["post-111862","post","type-post","status-publish","format-standard","hentry","category-server","tag-11653","tag-stm32","tag-270","tag-5116","tag-269","tag-78"],"yoast_head":"\n\u3010\u5d4c\u5165\u5f0f\u5916\u8bbe\u7cbe\u5b66\u3011Day15\uff5cDMA\uff1a\u534a\u6ee1\u5168\u6ee1\u3001\u4e52\u4e53\u3001\u4e3a\u4ec0\u4e48\u4e22\u6570 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/111862.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010\u5d4c\u5165\u5f0f\u5916\u8bbe\u7cbe\u5b66\u3011Day15\uff5cDMA\uff1a\u534a\u6ee1\u5168\u6ee1\u3001\u4e52\u4e53\u3001\u4e3a\u4ec0\u4e48\u4e22\u6570 - 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