{"id":764,"date":"2024-07-26T17:34:38","date_gmt":"2024-07-26T09:34:38","guid":{"rendered":"https:\/\/aoofoo.com\/?p=764"},"modified":"2024-07-28T15:53:26","modified_gmt":"2024-07-28T07:53:26","slug":"2-21-dma%e7%9b%b4%e6%8e%a5%e5%ad%98%e5%82%a8%e5%99%a8%e5%ad%98%e5%82%a8","status":"publish","type":"post","link":"https:\/\/aoofoo.com\/index.php\/2024\/07\/26\/2-21-dma%e7%9b%b4%e6%8e%a5%e5%ad%98%e5%82%a8%e5%99%a8%e5%ad%98%e5%82%a8\/","title":{"rendered":"2.22 DMA\u76f4\u63a5\u5b58\u50a8\u5668\u5b58\u50a8"},"content":{"rendered":"<h2>DMA\u7b80\u4ecb<\/h2>\n<p>DMA\u662f\u4e00\u4e2a\u6570\u636e\u8f6c\u8fd0\u5c0f\u52a9\u624b\uff0c\u5b83\u4e3b\u8981\u662f\u7528\u6765\u534f\u52a9CPU\u6765\u5b8c\u6210\u6570\u636e\u8f6c\u8fd0\u7684\u5de5\u4f5c\u3002<\/p>\n<p>DMA\uff08Direct Memory Access\uff09\u76f4\u63a5\u5b58\u50a8\u5668\u5b58\u53d6\uff08\u76f4\u63a5\u5b58\u50a8\u5668\u8bbf\u95ee\uff09\u3002\u4eceDMA\u7684\u540d\u5b57\u6765\u770b\uff0c\u8fd9\u4e2aDMA\u662f\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95eeSTM32\u5185\u90e8\u7684\u5b58\u50a8\u5668\u7684\uff0c\u5305\u62ec\u8fd0\u884c\u5185\u5b58SRAM\u3001\u7a0b\u5e8f\u5b58\u50a8\u5668Flash\u548c\u5bc4\u5b58\u5668\u7b49\u7b49\uff0cDMA\u90fd\u6709\u6743\u9650\u8bbf\u95ee\u4ed6\u4eec\uff0c\u6240\u4ee5DMA\u624d\u80fd\u5b8c\u6210\u6570\u636e\u8f6c\u8fd0\u7684\u5de5\u4f5c\u3002<\/p>\n<p>DMA\u53ef\u4ee5\u63d0\u4f9b\u5916\u8bbe\u548c\u5b58\u50a8\u5668\u6216\u8005\u5b58\u50a8\u5668\u548c\u5b58\u50a8\u5668\u4e4b\u95f4\u7684\u9ad8\u901f\u6570\u636e\u4f20\u8f93\uff0c\u65e0\u987bCPU\u5e72\u9884\uff0c\u8282\u7701\u4e86CPU\u7684\u8d44\u6e90\u3002\u5916\u8bbe\u5c31\u662f\u6307\u5916\u8bbe\u7684\u5bc4\u5b58\u5668\uff0c\u4e00\u822c\u662f\u5916\u8bbe\u7684\u6570\u636e\u5bc4\u5b58\u5668DR(Data Register)\uff0c\u6bd4\u5982ADC\u7684\u6570\u636e\u5bc4\u5b58\u5668\uff0c\u4e32\u53e3\u7684\u6570\u636e\u5bc4\u5b58\u5668\u7b49\u7b49\u3002\u5b58\u50a8\u5668\u6307\u7684\u5c31\u662f\u8fd0\u884c\u5185\u5b58SRAM\u548c\u7a0b\u5e8f\u5b58\u50a8\u5668Flash\uff0c\u662f\u6211\u4eec\u5b58\u50a8\u53d8\u91cf\u6570\u7ec4\u548c\u7a0b\u5e8f\u4ee3\u7801\u7684\u5730\u65b9\u3002<\/p>\n<p>STM32\u7684DMA\u670912\u4e2a\u72ec\u7acb\u53ef\u914d\u7f6e\u7684\u901a\u9053\uff1a DMA1\uff087\u4e2a\u901a\u9053\uff09\uff0c DMA2\uff085\u4e2a\u901a\u9053\uff09\uff0c\u8fd9\u4e2a\u901a\u9053\u5c31\u662f\u6570\u636e\u8f6c\u8fd0\u7684\u8def\u5f84\uff0c\u4ece\u4e00\u4e2a\u5730\u65b9\u79fb\u52a8\u5230\u53e6\u4e00\u4e2a\u5730\u65b9\uff0c\u5c31\u9700\u8981\u5360\u7528\u4e00\u4e2a\u901a\u9053\uff0c\u5982\u679c\u6709\u591a\u4e2a\u901a\u9053\u8fdb\u884c\u8f6c\u8fd0\uff0c\u90a3\u4ed6\u4eec\u4e4b\u95f4\u53ef\u4ee5\u5404\u8f6c\u5404\u7684\uff0c\u4e92\u4e0d\u5e72\u6270\u3002<\/p>\n<p>\u6bcf\u4e2a\u901a\u9053\u90fd\u652f\u6301<span style=\"color: #ff6600;\">\u8f6f\u4ef6\u89e6\u53d1<\/span>\u548c<span style=\"color: #ff6600;\">\u7279\u5b9a\u7684\u786c\u4ef6\u89e6\u53d1<\/span>\uff0c\u8fd9\u91cc\u5982\u679cDMA\u8fdb\u884c\u7684\u662f\u5b58\u50a8\u5668\u5230\u5b58\u50a8\u5668\u7684\u6570\u636e\u8f6c\u8fd0\uff0c\u6bd4\u5982\u6211\u4eec\u60f3\u628aFlash\u91cc\u7684\u4e00\u6279\u6570\u636e\u8f6c\u8fd0\u5230SRAM\u4e2d\uff0c\u90a3\u5c31\u9700\u8981\u8f6f\u4ef6\u89e6\u53d1\u4e86\uff0c\u4f7f\u7528\u8f6f\u4ef6\u89e6\u53d1\u4e4b\u540e\uff0cDMA\u5c31\u4f1a\u4e00\u80a1\u8111\u7684\u628a\u8fd9\u6279\u6570\u636e\u4ee5\u6700\u5feb\u7684\u901f\u5ea6\u5168\u90e8\u8f6c\u8fd0\u5b8c\u6210\u3002\u5982\u679cDMA\u8fdb\u884c\u7684\u662f\u5916\u8bbe\u5230\u5b58\u50a8\u5668\u7684\u6570\u636e\u8f6c\u8fd0\uff0c\u5c31\u4e0d\u80fd\u4e00\u80a1\u8111\u7684\u8f6c\u8fd0\u4e86\uff0c\u56e0\u4e3a\u5916\u8bbe\u7684\u6570\u636e\u662f\u6709\u4e00\u5b9a\u65f6\u673a\u7684\uff0c\u6240\u4ee5\u8fd9\u65f6\u5019\u6211\u4eec\u5c31\u9700\u8981\u7528\u786c\u4ef6\u89e6\u53d1\uff0c\u6bd4\u5982\u8f6c\u8fd0ADC\u7684\u6570\u636e\uff0c\u90a3\u5c31\u5f97ADC\u6bcf\u4e2a\u901a\u9053AD\u8f6c\u6362\u5b8c\u6210\u540e\uff0c\u786c\u4ef6\u89e6\u53d1\u4e00\u6b21DMA\uff0c\u4e4b\u540eDMA\u518d\u8f6c\u8fd0\uff0c\u89e6\u53d1\u4e00\u6b21\u8f6c\u8fd0\u4e00\u6b21\u3002\u6240\u4ee5<span 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#ff6600;\">\u786c\u4ef6\u89e6\u53d1<\/span>\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u662f\u7279\u5b9a\u7684\u786c\u4ef6\u51fa\u53d1\u5462\uff1f<\/p>\n<p>\u56e0\u4e3a\u6bcf\u4e2aDMA\u7684\u901a\u9053\uff0c\u5b83\u7684\u786c\u4ef6\u89e6\u53d1\u6e90\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u4f60\u8981\u4f7f\u7528\u67d0\u4e2a\u5916\u8bbe\u7684\u786c\u4ef6\u89e6\u53d1\u6e90\uff0c\u5c31\u5f97\u4f7f\u7528\u5b83\u8fde\u63a5\u7684\u90a3\u4e2a\u901a\u9053\uff0c\u800c\u4e0d\u80fd\u4efb\u610f\u9009\u62e9\u901a\u9053\u3002<\/p>\n<p>STM32F103C8T6\u7684DMA\u8d44\u6e90\u662fDMA1\uff087\u4e2a\u901a\u9053\uff09\u3002\u6211\u4eec\u8fd9\u4e2a\u82af\u7247\u53ea\u6709DMA1\u76847\u4e2a\u901a\u9053\uff0c\u6ca1\u6709DMA2\u3002<\/p>\n<h2>STM32\u7684\u5b58\u50a8\u5668\u6620\u50cf<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-768\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-198.png\" alt=\"\" width=\"961\" height=\"247\" \/><\/p>\n<p>\u65e2\u7136DMA\u662f\u5728\u5b58\u50a8\u5668\u4e4b\u95f4\u8fdb\u884c\u6570\u636e\u8f6c\u8fd0\u7684\uff0c\u90a3\u6211\u4eec\u5c31\u5e94\u8be5\u4e86\u89e3\u4e00\u4e0bSTM32\u4e2d\u90fd\u6709\u54ea\u4e9b\u5b58\u50a8\u5668\uff0c\u8fd9\u4e9b\u5b58\u50a8\u5668\u53c8\u662f\u88ab\u5b89\u6392\u5230\u4e86\u54ea\u4e9b\u5730\u5740\u4e0a\uff0c\u8fd9\u5c31\u662f\u5b58\u50a8\u5668\u6620\u50cf\u7684\u5185\u5bb9\u3002<\/p>\n<p>\u90a3\u6211\u4eec\u77e5\u9053\uff0c\u8ba1\u7b97\u673a\u7cfb\u7edf\u76845\u5927\u7ec4\u6210\u90e8\u5206\u662f\u8fd0\u7b97\u5668\u3001\u63a7\u5236\u5668\u3001\u5b58\u50a8\u5668\u3001\u8f93\u5165\u8bbe\u5907\u548c\u8f93\u51fa\u8bbe\u5907\u3002\u5176\u4e2d\u8fd0\u7b97\u5668\u548c\u63a7\u5236\u5668\u4e00\u822c\u4f1a\u5408\u5728\u4e00\u8d77\uff0c\u53eb\u505aCPU\uff0c\u6240\u4ee5\u8ba1\u7b97\u673a\u7684\u6838\u5fc3\u5173\u952e\u90e8\u5206\u5c31\u662fCPU\u548c\u5b58\u50a8\u5668\uff0c\u5b58\u50a8\u5668\u53c8\u6709\u4e24\u4e2a\u91cd\u8981\u77e5\u8bc6\u70b9\uff0c\u4e00\u4e2a\u662f\u5b58\u50a8\u5668\u7684\u5185\u5bb9\uff0c\u53e6\u4e00\u4e2a\u5c31\u662f\u5b58\u50a8\u5668\u7684\u5730\u5740\uff0c\u90a3STM32\u4e5f\u4e0d\u4f8b\u5916\uff0c\u4e0a\u7684\u8868\u5c31\u662fSTM32\u4e2d\u6240\u6709\u7c7b\u578b\u7684\u5b58\u50a8\u5668\u548c\u5b83\u4eec\u6240\u88ab\u5b89\u6392\u7684\u5730\u5740\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u8868\u91cc\uff0c\u65e0\u8bba\u662fFlash\u3001\u8fd8\u662fSRAM\uff0c\u8fd8\u662f\u5916\u8bbe\u5bc4\u5b58\u5668\uff0c\u5b83\u4eec\u90fd\u662f\u5b58\u50a8\u5668\u7684\u4e00\u79cd\uff0c\u5305\u62ec\u5916\u8bbe\u5bc4\u5b58\u5668\uff0c\u5b9e\u9645\u4e0a\u4e5f\u662f\u5b58\u50a8\u5668\u3002\u6211\u4eec\u524d\u9762\u6240\u8bf4\u7684\u5916\u8bbe\u5230\u5b58\u50a8\u5668\uff0c\u5b58\u50a8\u5668\u5230\u5b58\u50a8\u5668\uff0c<span style=\"color: #ff6600;\">\u672c\u8d28\u4e0a\u5b9e\u9645\u4e0a\u90fd\u662f\u5b58\u50a8\u5668\u4e4b\u95f4\u7684\u6570\u636e\u8f6c\u8fd0<\/span>\u3002\u81f3\u4e8e\u8bf4\u6210\u5916\u8bbe\u7684\u5b58\u50a8\u5668\uff0c\u53ea\u4e0d\u8fc7\u662fSTM32\u5b83\u7279\u522b\u6307\u5b9a\u4e86\u53ef\u4ee5\u8f6c\u8fd0\u7684\u5916\u8bbe\u7684\u5b58\u50a8\u5668\u800c\u5df2\u3002<\/p>\n<p>\u5b58\u50a8\u5668\u5171\u5206\u6210\u4e24\u5927\u7c7b\uff0cROM\u548cRAM\uff1a<\/p>\n<p>ROM\u5c31\u662f\u53ea\u8bfb\u5bc4\u5b58\u5668\uff0c\u662f\u4e00\u79cd\u975e\u6613\u5931\u6027\u3001\u6389\u7535\u4e0d\u4e22\u5931\u7684\u5b58\u50a8\u5668\u3002<\/p>\n<p>RAM\u5c31\u662f\u968f\u673a\u5b58\u50a8\u5668\uff0c\u662f\u4e00\u79cd\u6613\u5931\u6027\u3001\u6389\u7535\u4e22\u5931\u7684\u5b58\u50a8\u5668\u3002<\/p>\n<div class=\"sc-star-plane sc-star-plane--1\"><div class=\"sc-star-plane__content\"><\/p>\n<p>ROM\u53c8\u5206\u4e3a\u4e09\u5757\uff1a<\/p>\n<p>\u7b2c\u4e00\u5757\u662f\u7a0b\u5e8f\u5b58\u50a8\u5668Flash\uff0c\u4e5f\u5c31\u662f\u4e3b\u95ea\u5b58\uff0c\u5b83\u7684\u7528\u9014\u5c31\u662f\u5b58\u50a8C\u8bed\u8a00\u7f16\u8bd1\u540e\u7684\u7a0b\u5e8f\u4ee3\u7801\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u4e0b\u8f7d\u7a0b\u5e8f\u7684\u4f4d\u7f6e\u3002\u8fd0\u884c\u7a0b\u5e8f\u4e00\u822c\u4e5f\u662f\u4ece\u4e3b\u95ea\u5b58\u91cc\u9762\u5f00\u59cb\u8fd0\u884c\u7684\u3002\u8fd9\u4e00\u5757\u5b58\u50a8\u5668\uff0cSTM32\u7ed9\u4ed6\u5206\u914d\u7684\u5730\u5740\u7684\u662f0X08000000\u3002\u8d77\u59cb\u5730\u5740\uff0c\u4e5f\u5c31\u662f\u7b2c\u4e00\u4e2a\u5b57\u8282\u7684\u5730\u5740\u662f0800\uff0c\u7136\u540e\u5269\u4f59\u5b57\u8282\u7684\u5730\u5740\u4f9d\u6b21\u589e\u957f\uff0c\u6bcf\u4e2a\u5b57\u8282\u90fd\u5206\u914d\u4e00\u4e2a\u72ec\u4e00\u65e0\u4e8c\u7684\u5730\u5740\uff0c\u5c31\u60f3\u7ed9\u6bcf\u4e2a\u4f4f\u6237\u7f16\u95e8\u724c\u53f7\u4e00\u6837\uff0c\u53ea\u6709\u5206\u914d\u4e86\u72ec\u4e00\u65e0\u4e8c\u7684\u95e8\u724c\u53f7\uff0c\u7a0b\u5e8f\u624d\u80fd\u7cbe\u51c6\u7684\u8bbf\u95ee\u8fd9\u4e2a\u5b58\u50a8\u5668\u3002\u6700\u7ec8\u7ec8\u6b62\u5730\u5740\u662f\u591a\u5c11\u5462\uff1f\u8fd9\u53d6\u51b3\u4e8e\u5b83\u7684\u5bb9\u91cf\uff0c\u7f16\u5230\u54ea\u91cc\uff0c\u54ea\u91cc\u5c31\u662f\u7ec8\u6b62\u5730\u5740\uff0c\u8fd9\u5c31\u662f\u4e3b\u95ea\u5b58\u5730\u5740\u7684\u8303\u56f4\u3002\u4f60\u4e4b\u540e\u5982\u679c\u5728\u8f6f\u4ef6\u91cc\u770b\u5230\uff0c\u67d0\u4e2a\u6570\u636e\u7684\u5730\u5740\u5f00\u5934\u662f0800\u5f00\u5934\u7684\uff0c\u90a3\u4f60\u5c31\u53ef\u4ee5\u786e\u5b9a\uff0c\u4ed6\u662f\u5c5e\u4e8e\u4e3b\u95ea\u5b58\u7684\u6570\u636e\u3002<\/p>\n<p>\u5269\u4e0b\u4e24\u5757\u662f\u7cfb\u7edf\u5b58\u50a8\u5668\u548c\u9009\u9879\u5b57\u8282\uff0c\u8fd9\u4e24\u5757\u5b58\u50a8\u5668\u4e5f\u662fROM\u7684\u4e00\u79cd\uff0c\u6389\u7535\u4e0d\u4e22\u5931\u3002\u5b9e\u9645\u4e0a\u4ed6\u4eec\u7684\u5b58\u50a8\u4ecb\u8d28\u4e5f\u662fFlash\uff0c\u53ea\u4e0d\u8fc7\u6211\u4eec\u4e00\u822c\u8bf4Flash\u6307\u7684\u662f\u4e3b\u95ea\u5b58Flash\uff0c\u800c\u4e0d\u662f\u6307\u8fd9\u4e24\u5757\u533a\u57df\u3002\u7cfb\u7edf\u5b58\u50a8\u5668\u91cc\u662fBootLoader\u7a0b\u5e8f\uff0cBootLoader\u7a0b\u5e8f\u662f\u82af\u7247\u51fa\u5382\u81ea\u52a8\u5199\u5165\u7684\uff0c\u4e00\u822c\u4e5f\u4e0d\u5141\u8bb8\u6211\u4eec\u4fee\u6539\u3002\u9009\u9879\u5b57\u8282\u8fd9\u4e2a\u5b58\u50a8\u5668\u662f\u7528\u4e8e\u5b58\u50a8\u4e00\u4e9b\u72ec\u7acb\u4e8e\u7a0b\u5e8f\u4ee3\u7801\u7684\u53c2\u6570\u914d\u7f6e\uff0c\u4ed6\u7684\u4f4d\u7f6e\u5728ROM\u533a\u7684\u6700\u540e\u9762\uff0c\u4f60\u4e0b\u8f7d\u7a0b\u5e8f\u53ef\u4ee5\u4e0d\u5237\u65b0\u9009\u9879\u5b57\u8282\u7684\u5185\u5bb9\uff0c\u8fd9\u6837\u9009\u9879\u5b57\u8282\u7684\u914d\u7f6e\u5c31\u53ef\u4ee5\u4fdd\u6301\u4e0d\u53d8\uff0c\u9009\u9879\u5b57\u8282\u91cc\u5b58\u7684\u4e3b\u8981\u662fFlash\u7684\u8bfb\u4fdd\u62a4\u3001\u5199\u4fdd\u62a4\uff0c\u8fd8\u6709\u770b\u95e8\u72d7\u7b49\u914d\u7f6e\u3002<\/p>\n<p>RAM\u4e5f\u5206\u4e3a\u4e09\u5757\uff1a<\/p>\n<p>\u7b2c\u4e00\u5757\u662f\u8fd0\u884c\u5185\u5b58SRAM\uff0c\u5206\u914d\u7684\u5730\u5740\u662f0X2000000\uff0c\u7528\u4e8e\u5b58\u50a8\u8fd0\u884c\u4e2d\u7684\u4e34\u65f6\u53d8\u91cf\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u5728\u7a0b\u5e8f\u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf\u3001\u6570\u7ec4\u3001\u7ed3\u6784\u4f53\u7684\u5730\u65b9\u3002<\/p>\n<p>\u7b2c\u4e8c\u5757\u662f\u5916\u8bbe\u5bc4\u5b58\u5668\uff0c\u5206\u914d\u7684\u5730\u5740\u662f0X4000000\uff0c\u7528\u9014\u662f\u914d\u7f6e\u5404\u4e2a\u5916\u8bbe\u7684\u914d\u7f6e\u53c2\u6570\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u521d\u59cb\u5316\u5404\u4e2a\u5916\u8bbe\uff0c\u6700\u7ec8\u6240\u8bfb\u5199\u7684\u4e1c\u897f\uff0c\u521a\u624d\u6211\u4eec\u8bf4\u4e86\uff0c\u5916\u8bbe\u5bc4\u5b58\u5668\u4e5f\u662f\u5b58\u50a8\u5668\u7684\u4e00\u79cd\uff0c\u5b83\u7684\u5b58\u50a8\u4ecb\u8d28\u5176\u5b9e\u4e5f\u662fSRAM\uff0c\u53ea\u4e0d\u8fc7\u6211\u4eec\u4e00\u822c\u4e60\u60ef\u628a\u8fd0\u884c\u5185\u5b58\u53ebSRAM\uff0c\u5916\u8bbe\u5bc4\u5b58\u5668\u76f4\u63a5\u53eb\u5bc4\u5b58\u5668\u4e86\u3002<\/p>\n<p>\u7b2c\u4e09\u5757\u662f\u5185\u6838\u5916\u8bbe\u5bc4\u5b58\u5668\uff0c\u5206\u914d\u7684\u5730\u5740\u662f0XE000000\uff0c\u7528\u9014\u662f\u5b58\u50a8\u5185\u6838\u5404\u4e2a\u5916\u8bbe\u7684\u914d\u7f6e\u53c2\u6570\uff0c\u5185\u6838\u5916\u8bbe\u5c31\u662fNVIC\u548cSystick\uff0c\u56e0\u4e3a\u5185\u6838\u5916\u8bbe\u548c\u5176\u4ed6\u5916\u8bbe\u4e0d\u662f\u4e00\u4e2a\u5382\u5bb6\u8bbe\u8ba1\u7684\uff0c\u6240\u4ee5\u4ed6\u4eec\u7684\u5730\u5740\u4e5f\u662f\u88ab\u5206\u5f00\u4e86\u3002<\/p>\n<p><\/div><\/div>\n<h2>DMA\u6846\u56fe<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-773\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-199.png\" alt=\"\" width=\"556\" height=\"503\" 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loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-788\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-212.png\" alt=\"\" width=\"281\" height=\"75\" \/>\uff0c\u89e6\u53d1\uff0c\u5c31\u662fDMA\u9700\u8981\u5728\u4ec0\u4e48\u65f6\u673a\u8fdb\u884c\u8f6c\u8fd0\u7684\u3002\u89e6\u53d1\u6e90\u6709\u786c\u4ef6\u89e6\u53d1\u548c\u8f6f\u4ef6\u89e6\u53d1\uff0c\u5177\u4f53\u9009\u62e9\u54ea\u4e2a\uff1f\u7531M2M\u8fd9\u4e2a\u53c2\u6570\u51b3\u5b9a\u3002M2M\u5c31\u662fMemory to Memory\uff0c\u5f53\u6211\u4eec\u7ed9M2M\u4f4d\u7f6e1\u65f6\uff0cDMA\u5c31\u4f1a\u9009\u62e9\u8f6f\u4ef6\u89e6\u53d1\uff0c\u53cd\u4e4b\u4f1a\u8fdb\u884c\u786c\u4ef6\u89e6\u53d1\u3002\u8fd9\u4e2a\u8f6f\u4ef6\u89e6\u53d1\u5e76\u4e0d\u662f\u8c03\u7528\u67d0\u4e2a\u51fd\u6570\u4e00\u6b21\uff0c\u89e6\u53d1\u4e00\u6b21\uff0c\u4ed6\u8fd9\u4e2a\u8f6f\u4ef6\u89e6\u53d1\u7684\u6267\u884c\u903b\u8f91\u662f\uff0c\u4ee5\u6700\u5feb\u7684\u901f\u5ea6\uff0c\u8fde\u7eed\u4e0d\u65ad\u5730\u89e6\u53d1DMA\uff0c\u4e89\u53d6\u65e9\u65e5\u628a\u4f20\u8f93\u8ba1\u6570\u5668\u6e05\u96f6\uff0c\u5b8c\u6210\u8fd9\u4e00\u8f6e\u7684\u8f6c\u6362\u3002\u6240\u4ee5\u8fd9\u91cc\u7684\u8f6f\u4ef6\u89e6\u53d1\uff0c\u548c\u6211\u4eec\u4e4b\u524d\u5916\u90e8\u4e2d\u65ad\u548cADC\u7684\u8f6f\u4ef6\u89e6\u53d1\u4e0d\u592a\u4e00\u6837\uff0c\u4f60\u53ef\u4ee5\u628aDMA\u7684\u8f6f\u4ef6\u89e6\u53d1\u7406\u89e3\u6210\u8fde\u7eed\u89e6\u53d1\uff0c\u90a3\u8fd9\u4e2a\u8f6f\u4ef6\u89e6\u53d1\u548c\u5faa\u73af\u6a21\u5f0f\uff08\u5c31\u662f\u81ea\u52a8\u91cd\u88c5\u5668\u6062\u590d\u521d\u59cb\u503c\uff09\uff0c\u4e0d\u80fd\u540c\u65f6\u4f7f\u7528\uff0c\u56e0\u4e3a\u8f6f\u4ef6\u89e6\u53d1\u5c31\u662f\u60f3\u628a\u4f20\u8f93\u8ba1\u6570\u5668\u6e050\uff0c\u5faa\u73af\u6a21\u5f0f\u662f\u6e050\u540e\u81ea\u52a8\u91cd\u88c5\uff0c\u5982\u679c\u540c\u65f6\u7528\u7684\u8bdd\uff0c\u90a3\u4e48DMA\u5c31\u65e0\u6cd5\u505c\u4e0b\u4e86\u3002M2M\u7ed90\uff0c\u90a3\u5c31\u662f\u786c\u4ef6\u89e6\u53d1\uff0c\u786c\u4ef6\u89e6\u53d1\u6e90\u53ef\u4ee5\u9009\u62e9ADC\u3001\u4e32\u53e3\u3001\u5b9a\u65f6\u5668\u7b49\u7b49\uff0c\u4f7f\u7528\u786c\u4ef6\u89e6\u53d1\u7684\u8f6c\u8fd0\uff0c\u4e00\u822c\u90fd\u662f\u4e0e\u5916\u8bbe\u6709\u5173\u7684\u8f6c\u8fd0\uff0c\u8fd9\u4e9b\u8f6c\u8fd0\u9700\u8981\u4e00\u5b9a\u7684\u65f6\u673a\uff0c\u6bd4\u5982ADC\u8f6c\u6362\u5b8c\u6210\uff0c\u4e32\u53e3\u6536\u5230\u6570\u636e\u3001\u5b9a\u65f6\u5668\u65f6\u95f4\u5230\u7b49\u7b49\uff0c\u6240\u4ee5\u9700\u8981\u4f7f\u7528\u786c\u4ef6\u89e6\u53d1\uff0c\u5728\u786c\u4ef6\u8fbe\u5230\u8fd9\u4e9b\u65f6\u673a\u65f6\uff0c\u4f20\u4e00\u4e2a\u4fe1\u53f7\u8fc7\u6765\uff0c\u6765\u89e6\u53d1DMA\u8fdb\u884c\u8f6c\u8fd0\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u6700\u540e\uff0c\u662f\u5f00\u5173\u63a7\u5236\uff0c\u4e5f\u5c31\u662fDMA_Cmd\u51fd\u6570\uff0c\u5f53\u4f60DMA\u4f7f\u80fd\u540e\uff0cDMA\u5c31\u51c6\u5907\u5c31\u7eea\uff0c\u53ef\u4ee5\u8fdb\u884c\u8f6c\u8fd0\u4e86\u3002<\/p>\n<p>DMA\u8fdb\u884c\u8f6c\u8fd0\uff0c\u6709\u51e0\u4e2a\u6761\u4ef6\uff1a<\/p>\n<p>1.\u5f00\u5173\u63a7\u5236\u5fc5\u987b\u4f7f\u80fd\u3002<\/p>\n<p>2.\u4f20\u8f93\u8ba1\u6570\u5668\u5fc5\u987b\u5927\u4e8e0\u3002\uff08\u6709\u81ea\u52a8\u91cd\u88c5\u65f6\uff0c\u7b49\u4e8e\u96f6\u4f1a\u76f4\u63a5\u6062\u590d\u81f3\u521d\u59cb\u503c\uff09<\/p>\n<p>3.\u89e6\u53d1\u6e90\u5fc5\u987b\u6709\u89e6\u53d1\u4fe1\u53f7\u3002<\/p>\n<p>\u5982\u679c\u6ca1\u6709\u4e0a\u8ff0\u4e09\u4e2a\u6761\u4ef6\uff0c\u65e0\u8bba\u662f\u5426\u89e6\u53d1\uff0cDMA\u90fd\u4e0d\u4f1a\u518d\u8fdb\u884c\u8f6c\u8fd0\u4e86\u3002\u6b64\u65f6\u5c31\u9700\u8981DMA_Cmd\u7ed9DISABLE\uff0c\u5173\u95edDMA\u3002\u518d\u4e3a\u4f20\u8f93\u8ba1\u6570\u5668\u5199\u5165\u4e00\u4e2a\u5927\u4e8e0\u7684\u6570\uff0c\u518dDMA_Cmd\uff0c\u7ed9ENABLE\uff0c\u5f00\u542fDMA\u3002DMA\u624d\u80fd\u7ee7\u7eed\u5de5\u4f5c\uff0c\u6ce8\u610f\u4e00\u4e0b\uff0c\u5199\u4f20\u8f93\u8ba1\u6570\u5668\u65f6\uff0c\u5fc5\u987b\u8981\u5148\u5173\u95edDMA\u518d\u8fdb\u884c\uff0c\u4e0d\u80fd\u5728DMA\u5f00\u542f\u65f6\uff0c\u5199\u4f20\u8f93\u8ba1\u6570\u5668\uff0c\u8fd9\u662f\u624b\u518c\u91cc\u7684\u89c4\u5b9a\u3002<\/p>\n<h2>\u7ec6\u8282\u7684\u95ee\u9898<\/h2>\n<h3>DMA\u8bf7\u6c42<\/h3>\n<p>DMA1\u7684\u8bf7\u6c42\u6620\u50cf\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-792\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-214.png\" alt=\"\" width=\"619\" height=\"726\" \/><\/p>\n<p>DMA1\u67097\u4e2a\u901a\u9053\uff0c\u6bcf\u4e2a\u901a\u9053\u90fd\u67091\u4e2a\u6570\u636e\u9009\u62e9\u5668<img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-793\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-215.png\" alt=\"\" width=\"129\" height=\"65\" \/>\uff0c\u53ef\u4ee5\u9009\u62e9\u786c\u4ef6\u89e6\u53d1\u8fd8\u662f\u8f6f\u4ef6\u89e6\u53d1\uff0c\u628aEN\u4f4d\u653e\u5728\u4e86\u6570\u636e\u9009\u62e9\u5668\u7684\u4fa7\u8fb9\uff0c\u4e00\u822c\u6570\u636e\u9009\u62e9\u5668\u7684\u4fa7\u8fb9\u662f\u8f93\u5165\u9009\u62e9\u63a7\u5236\u4f4d\uff0c\u96be\u9053\u8fd9\u91cc\u7684\u610f\u601d\u662f\uff0cEN\u7ed91\uff0c\u9009\u62e9\u786c\u4ef6\u89e6\u53d1\uff0cEN\u7ed90\uff0c\u9009\u62e9\u8f6f\u4ef6\u89e6\u53d1\u5417\uff1f\u90a3\u663e\u7136\u4e0d\u5bf9\uff0c\u800c\u4e14\u5b83\u5de6\u8fb9\u8fd9\u91cc\u5199\u7684\u662f\u8f6f\u4ef6\u89e6\u53d1\uff08MEM2MEM\u4f4d\uff09\uff0c\u96be\u9053M2M\u4f4d\u662f\u8f6f\u4ef6\u89e6\u53d1\u7801\uff1f\u8fd9\u4e2a\u4e5f\u4e0d\u592a\u597d\u7406\u89e3\uff0c\u6240\u4ee5\u8fd9\u4e2a\u56fe\u9700\u8981\u7ed9\u4ed6\u91cd\u65b0\u5e03\u5c40\u4e00\u4e0b\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-791\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-213.png\" alt=\"\" width=\"710\" height=\"326\" \/><\/p>\n<p>DMA1\u7684\u8bf7\u6c42\u6620\u50cf\u5c31\u662f\u8fd9\u5f20\u56fe\u7684DMA\u89e6\u53d1\u90e8\u5206\u7684\u5185\u5bb9\u3002M2M\u4f4d\u662f\u6570\u636e\u9009\u62e9\u5668\u7684\u63a7\u5236\u4f4d\uff0c\u7528\u4e8e\u9009\u62e9\u786c\u4ef6\u89e6\u53d1\u8fd8\u662f\u8f6f\u4ef6\u89e6\u53d1\u3002EN\u4f4d\u662f\u5f00\u5173\u63a7\u5236\u3002EN=0\u65f6\u6570\u636e\u9009\u62e9\u5668\u4e0d\u5de5\u4f5c\uff0cEN=1\u65f6\u6570\u636e\u9009\u62e9\u5668\u5de5\u4f5c\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-794\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-216.png\" alt=\"\" width=\"326\" height=\"85\" \/>DMA1\u8bf7\u6c42\u6620\u50cf\u8fd9\u6837\u753b\u7684\u610f\u601d\u662f\u5e94\u8be5\u662f\uff0cEN\u5e76\u4e0d\u662f\u6570\u636e\u9009\u62e9\u5668\u7684\u63a7\u5236\u4f4d\uff0c\u800c\u662f\u51b3\u5b9a\u8fd9\u4e2a\u6570\u636e\u9009\u62e9\u5668\u8981\u4e0d\u8981\u5de5\u4f5c\u3002EN=0\u65f6\u6570\u636e\u9009\u62e9\u5668\u4e0d\u5de5\u4f5c\uff0cEN=1\u65f6\u6570\u636e\u9009\u62e9\u5668\u5de5\u4f5c\u3002\u7136\u540e\u8f6f\u4ef6\u89e6\u53d1\u540e\u9762\u8ddf\u4e2aM2M\u4f4d\u7684\u610f\u601d\u5e94\u8be5\u662f\uff0c\u5f53M2M\u4f4d=1\u65f6\uff0c\u9009\u62e9\u8f6f\u4ef6\u89e6\u53d1\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-795\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-217.png\" alt=\"\" width=\"329\" height=\"90\" 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