{"id":78042,"date":"2026-02-26T01:17:45","date_gmt":"2026-02-25T17:17:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/78042.html"},"modified":"2026-02-26T01:17:45","modified_gmt":"2026-02-25T17:17:45","slug":"%e5%b5%8c%e5%85%a5%e5%bc%8f%e9%80%9a%e4%bf%a1%e4%b8%ad%e7%9a%84%e9%9a%90%e5%bd%a2%e9%94%99%e8%af%af%ef%bc%9a%e7%94%b5%e5%b9%b3%e8%bd%ac%e6%8d%a2%e3%80%81%e6%97%b6%e5%ba%8f%e6%8a%96","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/78042.html","title":{"rendered":"\u5d4c\u5165\u5f0f\u901a\u4fe1\u4e2d\u7684\u2018\u9690\u5f62\u2019\u9519\u8bef\uff1a\u7535\u5e73\u8f6c\u6362\u3001\u65f6\u5e8f\u6296\u52a8\u4e0eDMA\u6ea2\u51fa\u7684\u5b9e\u6218\u8bca\u65ad"},"content":{"rendered":"<h2>\u5d4c\u5165\u5f0f\u901a\u4fe1\u4e2d\u7684\u2018\u9690\u5f62\u2019\u9519\u8bef&#xff1a;\u7535\u5e73\u8f6c\u6362\u3001\u65f6\u5e8f\u6296\u52a8\u4e0eDMA\u6ea2\u51fa\u7684\u5b9e\u6218\u8bca\u65ad<\/h2>\n<p>\u5728\u667a\u80fd\u786c\u4ef6\u91cf\u4ea7\u6d4b\u8bd5\u9636\u6bb5&#xff0c;\u968f\u673a\u901a\u4fe1\u5931\u8d25\u5f80\u5f80\u662f\u6700\u4ee4\u4eba\u5934\u75bc\u7684\u95ee\u9898\u4e4b\u4e00\u3002\u8868\u9762\u4e0a\u770b&#xff0c;\u4ee3\u7801\u903b\u8f91\u6b63\u786e\u3001\u786c\u4ef6\u8fde\u63a5\u65e0\u8bef&#xff0c;\u4f46\u5c31\u662f\u4f1a\u5728\u67d0\u4e9b\u4e0d\u53ef\u9884\u6d4b\u7684\u65f6\u523b\u51fa\u73b0\u6570\u636e\u4e22\u5931\u6216\u901a\u4fe1\u4e2d\u65ad\u3002\u8fd9\u7c7b\u95ee\u9898\u901a\u5e38\u9690\u85cf\u5728\u610f\u60f3\u4e0d\u5230\u7684\u89d2\u843d&#xff1a;\u53ef\u80fd\u662f\u7535\u5e73\u8f6c\u6362\u82af\u7247\u7684\u5fae\u5999\u7279\u6027&#xff0c;\u53ef\u80fd\u662f\u4e2d\u65ad\u54cd\u5e94\u65f6\u7684\u65f6\u5e8f\u6296\u52a8&#xff0c;\u4e5f\u53ef\u80fd\u662fDMA\u4f20\u8f93\u4e2d\u7684\u7f13\u51b2\u533a\u6ea2\u51fa\u3002\u8fd9\u4e9b\u201c\u9690\u5f62\u201d\u9519\u8bef\u4e0d\u4f1a\u5728\u5f00\u53d1\u9636\u6bb5\u8f7b\u6613\u66b4\u9732&#xff0c;\u5374\u4f1a\u5728\u91cf\u4ea7\u6d4b\u8bd5\u4e2d\u7a81\u7136\u7206\u53d1&#xff0c;\u6210\u4e3a\u4ea7\u54c1\u53ef\u9760\u6027\u7684\u81f4\u547d\u5f31\u70b9\u3002<\/p>\n<p>\u4f5c\u4e3a\u4e00\u540d\u5d4c\u5165\u5f0f\u5de5\u7a0b\u5e08&#xff0c;\u6211\u7ecf\u5386\u8fc7\u591a\u6b21\u8fd9\u6837\u7684\u8c03\u8bd5\u6218\u5f79\u3002\u6700\u6df1\u523b\u7684\u4e00\u6b21\u662f\u67d0\u4e2a\u667a\u80fd\u5bb6\u5c45\u9879\u76ee&#xff0c;\u5728\u524d\u671f\u6d4b\u8bd5\u4e2d\u901a\u4fe1\u7a33\u5b9a\u6027\u8fbe\u523099.9%&#xff0c;\u4f46\u5728\u91cf\u4ea7\u73af\u5883\u4e0b\u7684\u968f\u673a\u5931\u8d25\u7387\u5374\u7a81\u7136\u98d9\u5347\u52305%\u3002\u6211\u4eec\u82b1\u4e86\u6574\u6574\u4e24\u5468\u65f6\u95f4&#xff0c;\u52a8\u7528\u4e86\u903b\u8f91\u5206\u6790\u4eea\u3001\u793a\u6ce2\u5668\u548c\u5404\u79cd\u8c03\u8bd5\u5de5\u5177&#xff0c;\u6700\u7ec8\u53d1\u73b0\u95ee\u9898\u662fRS-232\u7535\u5e73\u8f6c\u6362\u82af\u7247\u7684\u54cd\u5e94\u65f6\u95f4\u4e0d\u4e00\u81f4\u5bfc\u81f4\u7684\u65f6\u5e8f\u9519\u4f4d\u3002\u8fd9\u6b21\u7ecf\u5386\u8ba9\u6211\u6df1\u523b\u8ba4\u8bc6\u5230&#xff0c;\u5d4c\u5165\u5f0f\u901a\u4fe1\u8c03\u8bd5\u8fdc\u4e0d\u6b62\u662f\u4ee3\u7801\u7f16\u5199&#xff0c;\u66f4\u9700\u8981\u4ece\u786c\u4ef6\u7279\u6027\u3001\u65f6\u5e8f\u5206\u6790\u548c\u7cfb\u7edf\u7ea7\u89c6\u89d2\u8fdb\u884c\u5168\u9762\u8bca\u65ad\u3002<\/p>\n<h3>1. \u7535\u5e73\u517c\u5bb9\u6027&#xff1a;\u9690\u85cf\u5728\u6700\u524d\u7aef\u7684\u901a\u4fe1\u6740\u624b<\/h3>\n<p>\u7535\u5e73\u8f6c\u6362\u95ee\u9898\u770b\u4f3c\u57fa\u7840&#xff0c;\u5374\u662f\u5b9e\u9645\u9879\u76ee\u4e2d\u6700\u5bb9\u6613\u5ffd\u89c6\u7684\u9690\u60a3\u3002\u8bb8\u591a\u5de5\u7a0b\u5e08\u8ba4\u4e3a\u53ea\u8981\u6309\u7167\u201cTXD\u63a5RXD\u201d\u7684\u6807\u51c6\u63a5\u7ebf\u5c31\u4e07\u4e8b\u5927\u5409&#xff0c;\u5374\u5ffd\u7565\u4e86\u4e0d\u540c\u7535\u5e73\u6807\u51c6\u4e4b\u95f4\u7684\u5fae\u5999\u5dee\u5f02\u3002<\/p>\n<h4>1.1 TTL\u4e0eRS-232\u7684\u7535\u5e73\u7279\u6027\u6df1\u5ea6\u89e3\u6790<\/h4>\n<p>\u5728\u7406\u60f3\u60c5\u51b5\u4e0b&#xff0c;TTL\u7535\u5e73\u4ee50V\u8868\u793a\u903b\u8f910&#xff0c;5V\u8868\u793a\u903b\u8f911&#xff0c;\u800cRS-232\u5219\u91c7\u7528\u00b115V\u7684\u8d1f\u903b\u8f91\u4f53\u7cfb\u3002\u8fd9\u79cd\u7535\u538b\u5dee\u5f02\u4e0d\u4ec5\u662f\u4e3a\u4e86\u63d0\u9ad8\u6297\u5e72\u6270\u80fd\u529b&#xff0c;\u8fd8\u6d89\u53ca\u5230\u4fe1\u53f7\u4f20\u8f93\u7684\u7269\u7406\u7279\u6027\u3002<\/p>\n<p>\u5b9e\u9645\u6d4b\u8bd5\u4e2d\u53d1\u73b0\u7684\u5173\u952e\u5dee\u5f02&#xff1a;<\/p>\n<table>\n<tr>\u7279\u6027\u53c2\u6570TTL\u7535\u5e73\u6807\u51c6RS-232\u6807\u51c6\u6f5c\u5728\u51b2\u7a81\u70b9<\/tr>\n<tbody>\n<tr>\n<td>\u903b\u8f910\u7535\u538b\u8303\u56f4<\/td>\n<td>0V &#8211; 0.8V<\/td>\n<td>&#043;3V &#8211; &#043;15V<\/td>\n<td>TTL\u903b\u8f910\u53ef\u80fd\u88ab\u8bef\u5224\u4e3aRS-232\u7a7a\u95f2\u72b6\u6001<\/td>\n<\/tr>\n<tr>\n<td>\u903b\u8f911\u7535\u538b\u8303\u56f4<\/td>\n<td>2.0V &#8211; 5V<\/td>\n<td>-15V &#8211; -3V<\/td>\n<td>\u7535\u538b\u6781\u6027\u5b8c\u5168\u76f8\u53cd<\/td>\n<\/tr>\n<tr>\n<td>\u4e0a\u5347\u65f6\u95f4\u8981\u6c42<\/td>\n<td>\u901a\u5e38&lt;100ns<\/td>\n<td>\u901a\u5e38&lt;30V\/\u03bcs<\/td>\n<td>\u8f6c\u6362\u82af\u7247\u54cd\u5e94\u65f6\u95f4\u4e0d\u5339\u914d<\/td>\n<\/tr>\n<tr>\n<td>\u566a\u58f0\u5bb9\u9650<\/td>\n<td>\u7ea60.4V<\/td>\n<td>\u7ea62V<\/td>\n<td>\u5de5\u4e1a\u73af\u5883\u4e2d\u7684\u566a\u58f0\u5e72\u6270<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u63d0\u793a&#xff1a;\u5728\u4f7f\u7528USB\u8f6c\u4e32\u53e3\u6a21\u5757\u65f6&#xff0c;\u52a1\u5fc5\u786e\u8ba4\u6a21\u5757\u7684\u5b9e\u9645\u7535\u5e73\u8f93\u51fa\u3002\u6709\u4e9b\u6807\u6ce8\u4e3a&#034;USB\u8f6cTTL&#034;\u7684\u6a21\u5757\u5b9e\u9645\u8f93\u51fa\u53ef\u80fd\u662f3.3V\u7535\u5e73&#xff0c;\u76f4\u63a5\u8fde\u63a55V\u7cfb\u7edf\u53ef\u80fd\u9020\u6210\u7535\u538b\u4e0d\u5339\u914d\u3002<\/p>\n<h4>1.2 \u7535\u5e73\u8f6c\u6362\u82af\u7247\u7684\u9690\u85cf\u9677\u9631<\/h4>\n<p>\u5e02\u9762\u4e0a\u5e38\u89c1\u7684CH340\u3001CP2102\u7b49\u8f6c\u6362\u82af\u7247\u867d\u7136\u5f15\u811a\u517c\u5bb9&#xff0c;\u4f46\u5728\u5b9e\u9645\u6027\u80fd\u4e0a\u5b58\u5728\u663e\u8457\u5dee\u5f02\u3002\u6211\u4eec\u66fe\u7ecf\u9047\u5230\u8fc7\u8fd9\u6837\u7684\u60c5\u51b5&#xff1a;\u4f7f\u7528CH340\u82af\u7247\u65f6\u901a\u4fe1\u5b8c\u5168\u6b63\u5e38&#xff0c;\u6362\u7528CP2102\u540e\u5374\u5728\u9ad8\u901f\u4f20\u8f93\u4e2d\u51fa\u73b0\u6570\u636e\u4e22\u5931\u3002<\/p>\n<p>\u6839\u672c\u539f\u56e0\u5206\u6790&#xff1a;<\/p>\n<p>\/\/ \u901a\u8fc7\u793a\u6ce2\u5668\u6355\u83b7\u7684\u7535\u5e73\u8f6c\u6362\u65f6\u95f4\u5dee\u5f02<br \/>\n#define CH340_RISE_TIME_NS  50  \/\/ \u7eb3\u79d2<br \/>\n#define CP2102_RISE_TIME_NS 35  \/\/ \u7eb3\u79d2<\/p>\n<p>\/\/ \u5728115200\u6ce2\u7279\u7387\u4e0b&#xff0c;\u6bcf\u4f4d\u65f6\u95f4\u7ea6\u4e3a8.68\u03bcs<br \/>\n\/\/ \u8f6c\u6362\u65f6\u95f4\u5dee\u5f02\u5360\u4f4d\u65f6\u95f4\u7684\u6bd4\u4f8b&#xff1a;<br \/>\nfloat ch340_time_ratio &#061; (50.0 \/ 8680.0) * 100;  \/\/ \u7ea60.58%<br \/>\nfloat cp2102_time_ratio &#061; (35.0 \/ 8680.0) * 100; \/\/ \u7ea60.40%<\/p>\n<p>\u8fd9\u4e2a\u5fae\u5c0f\u7684\u6bd4\u4f8b\u5dee\u5f02\u5728\u4f4e\u901f\u901a\u4fe1\u4e2d\u65e0\u5173\u7d27\u8981&#xff0c;\u4f46\u5728\u9ad8\u901f\u6216\u957f\u8ddd\u79bb\u4f20\u8f93\u4e2d\u4f1a\u7d2f\u79ef\u6210\u4e3a\u4e25\u91cd\u7684\u65f6\u5e8f\u95ee\u9898\u3002\u7279\u522b\u662f\u5728\u4f7f\u7528DMA\u4f20\u8f93\u5927\u91cf\u6570\u636e\u65f6&#xff0c;\u8fd9\u79cd\u5fae\u5c0f\u7684\u65f6\u95f4\u5dee\u5f02\u4f1a\u5bfc\u81f4\u7f13\u51b2\u533a\u6ea2\u51fa\u6216\u6570\u636e\u5e27\u9519\u4f4d\u3002<\/p>\n<h4>1.3 \u5b9e\u6218\u8bca\u65ad\u6d41\u7a0b<\/h4>\n<p>\u5f53\u6000\u7591\u7535\u5e73\u8f6c\u6362\u95ee\u9898\u65f6&#xff0c;\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u7cfb\u7edf\u5316\u8bca\u65ad&#xff1a;<\/p>\n<li>\n<p>\u793a\u6ce2\u5668\u4fe1\u53f7\u8d28\u91cf\u68c0\u67e5<\/p>\n<ul>\n<li>\u6d4b\u91cfTXD\/RXD\u7ebf\u4e0a\u7684\u5b9e\u9645\u7535\u538b\u5cf0\u503c&#xff0c;\u786e\u8ba4\u7b26\u5408\u76ee\u6807\u8bbe\u5907\u8981\u6c42<\/li>\n<li>\u68c0\u67e5\u4fe1\u53f7\u4e0a\u5347\/\u4e0b\u964d\u65f6\u95f4\u662f\u5426\u5728\u82af\u7247\u89c4\u683c\u8303\u56f4\u5185<\/li>\n<li>\u89c2\u5bdf\u662f\u5426\u5b58\u5728\u8fc7\u51b2\u3001\u632f\u94c3\u6216\u566a\u58f0\u5e72\u6270<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u4ea4\u53c9\u6d4b\u8bd5\u9a8c\u8bc1<\/p>\n<ul>\n<li>\u4f7f\u7528\u5df2\u77e5\u826f\u597d\u7684\u8f6c\u6362\u6a21\u5757\u8fdb\u884c\u5bf9\u6bd4\u6d4b\u8bd5<\/li>\n<li>\u5c1d\u8bd5\u4e0d\u540c\u54c1\u724c\u7684\u8f6c\u6362\u82af\u7247&#xff0c;\u89c2\u5bdf\u95ee\u9898\u662f\u5426\u91cd\u73b0<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u73af\u5883\u56e0\u7d20\u8bc4\u4f30<\/p>\n<ul>\n<li>\u68c0\u67e5\u7535\u6e90\u7a33\u5b9a\u6027&#xff0c;\u7535\u538b\u6ce2\u52a8\u4f1a\u5f71\u54cd\u8f6c\u6362\u82af\u7247\u6027\u80fd<\/li>\n<li>\u8bc4\u4f30\u6e29\u5ea6\u5bf9\u82af\u7247\u6027\u80fd\u7684\u5f71\u54cd&#xff0c;\u7279\u522b\u662f\u5de5\u4e1a\u7ea7\u5e94\u7528<\/li>\n<\/ul>\n<\/li>\n<p>\u6211\u4eec\u5728\u67d0\u4e2a\u5de5\u4e1a\u7269\u8054\u7f51\u9879\u76ee\u4e2d\u66fe\u9047\u5230\u6e29\u5ea6\u76f8\u5173\u7684\u901a\u4fe1\u6545\u969c&#xff1a;\u5728\u5ba4\u6e29\u4e0b\u901a\u4fe1\u6b63\u5e38&#xff0c;\u4f46\u5f53\u73af\u5883\u6e29\u5ea6\u5347\u81f345\u00b0C\u4ee5\u4e0a\u65f6&#xff0c;\u901a\u4fe1\u5931\u8d25\u7387\u663e\u8457\u4e0a\u5347\u3002\u6700\u7ec8\u53d1\u73b0\u662f\u7535\u5e73\u8f6c\u6362\u82af\u7247\u7684\u6e29\u5ea6\u7279\u6027\u4e0d\u4f73&#xff0c;\u9ad8\u6e29\u4e0b\u8f93\u51fa\u9a71\u52a8\u80fd\u529b\u4e0b\u964d\u5bfc\u81f4\u3002<\/p>\n<h3>2. \u65f6\u5e8f\u6296\u52a8&#xff1a;\u5d4c\u5165\u5f0f\u7cfb\u7edf\u4e2d\u7684\u6c89\u9ed8\u523a\u5ba2<\/h3>\n<p>\u65f6\u5e8f\u95ee\u9898\u662f\u6700\u96be\u8c03\u8bd5\u7684\u5d4c\u5165\u5f0f\u901a\u4fe1\u6545\u969c\u4e4b\u4e00&#xff0c;\u56e0\u4e3a\u5b83\u4eec\u5f80\u5f80\u662f\u968f\u673a\u51fa\u73b0\u7684&#xff0c;\u800c\u4e14\u5f88\u96be\u5728\u5b9e\u9a8c\u5ba4\u73af\u5883\u4e2d\u91cd\u73b0\u3002<\/p>\n<h4>2.1 \u4e2d\u65ad\u54cd\u5e94\u65f6\u5e8f\u7684\u5f71\u54cd\u673a\u5236<\/h4>\n<p>\u5728\u4e32\u53e3\u901a\u4fe1\u4e2d&#xff0c;\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b&#xff08;ISR&#xff09;\u7684\u54cd\u5e94\u65f6\u95f4\u76f4\u63a5\u5f71\u54cd\u6570\u636e\u63a5\u6536\u7684\u53ef\u9760\u6027\u3002\u7406\u60f3\u60c5\u51b5\u4e0b&#xff0c;\u4e2d\u65ad\u5e94\u8be5\u5728\u6bcf\u4e2a\u5b57\u8282\u5230\u8fbe\u540e\u7acb\u5373\u88ab\u54cd\u5e94&#xff0c;\u4f46\u73b0\u5b9e\u5f80\u5f80\u5e76\u975e\u5982\u6b64\u3002<\/p>\n<p>\u5e38\u89c1\u7684\u4e2d\u65ad\u54cd\u5e94\u5ef6\u8fdf\u6765\u6e90&#xff1a;<\/p>\n<ul>\n<li>\u4e2d\u65ad\u5d4c\u5957\u4e0e\u4f18\u5148\u7ea7&#xff1a;\u9ad8\u4f18\u5148\u7ea7\u4e2d\u65ad\u963b\u585e\u4e32\u53e3\u4e2d\u65ad<\/li>\n<li>\u4e34\u754c\u533a\u4fdd\u62a4&#xff1a;\u5173\u4e2d\u65ad\u65f6\u95f4\u8fc7\u957f<\/li>\n<li>ISR\u5904\u7406\u903b\u8f91&#xff1a;\u8fc7\u4e8e\u590d\u6742\u7684\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f<\/li>\n<li>\u7f13\u5b58\u4e00\u81f4\u6027&#xff1a;CPU\u7f13\u5b58\u672a\u547d\u4e2d\u5bfc\u81f4\u7684\u5ef6\u8fdf<\/li>\n<\/ul>\n<p>\/\/ \u9519\u8bef\u793a\u4f8b&#xff1a;\u5728ISR\u4e2d\u6267\u884c\u590d\u6742\u64cd\u4f5c<br \/>\nvoid USART1_IRQHandler(void) {<br \/>\n    if(USART1-&gt;SR &amp; USART_SR_RXNE) {<br \/>\n        \/\/ \u8bfb\u53d6\u63a5\u6536\u5230\u7684\u6570\u636e<br \/>\n        uint8_t data &#061; USART1-&gt;DR;<\/p>\n<p>        \/\/ \u5728ISR\u4e2d\u6267\u884c\u8017\u65f6\u64cd\u4f5c &#8211; \u4e25\u91cd\u9519\u8bef&#xff01;<br \/>\n        process_data(data);  \/\/ \u53ef\u80fd\u5305\u542b\u590d\u6742\u8ba1\u7b97\u6216\u5ef6\u65f6<br \/>\n        update_display();    \/\/ \u53ef\u80fd\u8c03\u7528\u963b\u585e\u51fd\u6570<\/p>\n<p>        \/\/ \u6b63\u786e\u505a\u6cd5&#xff1a;\u4ec5\u5c06\u6570\u636e\u5b58\u5165\u7f13\u51b2\u533a&#xff0c;\u5728\u4e3b\u5faa\u73af\u4e2d\u5904\u7406<br \/>\n    }<br \/>\n}<\/p>\n<p>\u6ce8\u610f&#xff1a;\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b\u5e94\u8be5\u5c3d\u53ef\u80fd\u7b80\u77ed&#xff0c;\u53ea\u6267\u884c\u6700\u5fc5\u8981\u7684\u64cd\u4f5c&#xff08;\u5982\u4fdd\u5b58\u6570\u636e\u5230\u7f13\u51b2\u533a\u3001\u6e05\u9664\u6807\u5fd7\u4f4d&#xff09;&#xff0c;\u7e41\u91cd\u7684\u5904\u7406\u4efb\u52a1\u5e94\u8be5\u653e\u5728\u4e3b\u5faa\u73af\u6216\u540e\u53f0\u4efb\u52a1\u4e2d\u3002<\/p>\n<h4>2.2 \u6ce2\u7279\u7387\u8bef\u5dee\u4e0e\u65f6\u949f\u7cbe\u5ea6<\/h4>\n<p>\u6ce2\u7279\u7387\u8bef\u5dee\u662f\u53e6\u4e00\u4e2a\u5e38\u89c1\u7684\u65f6\u5e8f\u95ee\u9898\u6765\u6e90\u3002\u5373\u4f7f\u5fae\u5c0f\u7684\u65f6\u949f\u504f\u5dee&#xff0c;\u5728\u5927\u91cf\u6570\u636e\u4f20\u8f93\u4e2d\u4e5f\u4f1a\u7d2f\u79ef\u6210\u4e3a\u4e25\u91cd\u7684\u540c\u6b65\u95ee\u9898\u3002<\/p>\n<p>STM32\u7cfb\u5217MCU\u7684\u6ce2\u7279\u7387\u8bef\u5dee\u8ba1\u7b97&#xff1a;<\/p>\n<p>\/\/ \u8ba1\u7b97\u5b9e\u9645\u6ce2\u7279\u7387\u4e0e\u7406\u8bba\u503c\u7684\u8bef\u5dee<br \/>\n#define F_CLK 72000000UL  \/\/ \u7cfb\u7edf\u65f6\u949f\u9891\u7387<br \/>\n#define BAUD_RATE 115200  \/\/ \u76ee\u6807\u6ce2\u7279\u7387<\/p>\n<p>\/\/ \u8ba1\u7b97USARTDIV\u503c<br \/>\nfloat usartdiv &#061; (float)F_CLK \/ (16 * BAUD_RATE);<\/p>\n<p>\/\/ \u83b7\u53d6\u6574\u6570\u548c\u5c0f\u6570\u90e8\u5206<br \/>\nuint16_t mantissa &#061; (uint16_t)usartdiv;<br \/>\nuint16_t fraction &#061; (uint16_t)((usartdiv &#8211; mantissa) * 16 &#043; 0.5);<\/p>\n<p>\/\/ \u8ba1\u7b97\u5b9e\u9645\u6ce2\u7279\u7387<br \/>\nfloat actual_baud &#061; (float)F_CLK \/ (16 * (mantissa &#043; fraction\/16.0));<\/p>\n<p>\/\/ \u8ba1\u7b97\u8bef\u5dee\u767e\u5206\u6bd4<br \/>\nfloat error_percent &#061; ((actual_baud &#8211; BAUD_RATE) \/ BAUD_RATE) * 100;<\/p>\n<p>\u5f53\u8bef\u5dee\u8d85\u8fc72-3%\u65f6&#xff0c;\u901a\u4fe1\u53ef\u9760\u6027\u4f1a\u663e\u8457\u4e0b\u964d\u3002\u7279\u522b\u662f\u5728\u9ad8\u901f\u901a\u4fe1\u6216\u957f\u6570\u636e\u5e27\u4f20\u8f93\u4e2d&#xff0c;\u8fd9\u79cd\u8bef\u5dee\u4f1a\u5bfc\u81f4\u91c7\u6837\u70b9\u504f\u79fb&#xff0c;\u6700\u7ec8\u9020\u6210\u6570\u636e\u9519\u8bef\u3002<\/p>\n<h4>2.3 \u903b\u8f91\u5206\u6790\u4eea\u5728\u65f6\u5e8f\u8c03\u8bd5\u4e2d\u7684\u5e94\u7528<\/h4>\n<p>\u903b\u8f91\u5206\u6790\u4eea\u662f\u8bca\u65ad\u65f6\u5e8f\u95ee\u9898\u7684\u5229\u5668&#xff0c;\u53ef\u4ee5\u540c\u65f6\u6355\u83b7\u591a\u6761\u4fe1\u53f7\u7ebf\u7684\u65f6\u95f4\u5173\u7cfb\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u903b\u8f91\u5206\u6790\u4eea\u8bca\u65ad\u901a\u4fe1\u95ee\u9898\u7684\u5178\u578b\u6d41\u7a0b&#xff1a;<\/p>\n<li>\u8bbe\u7f6e\u91c7\u6837\u7387&#xff1a;\u81f3\u5c11\u4e3a\u901a\u4fe1\u901f\u7387\u76844-5\u500d&#xff0c;\u786e\u4fdd\u80fd\u6355\u83b7\u7ec6\u8282<\/li>\n<li>\u89e6\u53d1\u6761\u4ef6&#xff1a;\u8bbe\u7f6e\u5408\u9002\u7684\u89e6\u53d1\u6761\u4ef6&#xff0c;\u5982\u7279\u5b9a\u6570\u636e\u6a21\u5f0f\u6216\u9519\u8bef\u6807\u5fd7<\/li>\n<li>\u591a\u4fe1\u53f7\u540c\u6b65&#xff1a;\u540c\u65f6\u6355\u83b7TXD\u3001RXD\u3001\u4e2d\u65ad\u4fe1\u53f7\u548cDMA\u4fe1\u53f7<\/li>\n<li>\u65f6\u95f4\u6d4b\u91cf&#xff1a;\u7cbe\u786e\u6d4b\u91cf\u4e2d\u65ad\u54cd\u5e94\u65f6\u95f4\u3001\u5b57\u8282\u95f4\u9694\u65f6\u95f4\u7b49\u5173\u952e\u53c2\u6570<\/li>\n<p>\u5728\u4e00\u6b21\u5b9e\u9645\u8c03\u8bd5\u4e2d&#xff0c;\u6211\u4eec\u901a\u8fc7\u903b\u8f91\u5206\u6790\u4eea\u53d1\u73b0\u4e86\u4e00\u4e2a\u6781\u5176\u9690\u853d\u7684\u95ee\u9898&#xff1a;\u5f53\u4f7f\u80fd\u4e86\u770b\u95e8\u72d7\u5b9a\u65f6\u5668\u540e&#xff0c;\u6bcf\u79d2\u949f\u4f1a\u4ea7\u751f\u4e00\u6b21\u5fae\u5c0f\u7684\u65f6\u5e8f\u6296\u52a8&#xff0c;\u6b63\u597d\u4e0e\u901a\u4fe1\u5931\u8d25\u7684\u65f6\u95f4\u70b9\u543b\u5408\u3002\u539f\u56e0\u662f\u770b\u95e8\u72d7\u590d\u4f4d\u4f1a\u5f71\u54cd\u7cfb\u7edf\u65f6\u949f\u7684\u7a33\u5b9a\u6027&#xff0c;\u8fdb\u800c\u5f71\u54cdUSART\u6ce2\u7279\u7387\u7684\u7cbe\u5ea6\u3002<\/p>\n<h3>3. DMA\u4f20\u8f93\u4e2d\u7684\u6ea2\u51fa\u4e0e\u8fb9\u754c\u6761\u4ef6<\/h3>\n<p>DMA\u5927\u5927\u51cf\u8f7b\u4e86CPU\u8d1f\u62c5&#xff0c;\u4f46\u4e5f\u5f15\u5165\u4e86\u65b0\u7684\u590d\u6742\u6027\u3002DMA\u6ea2\u51fa\u3001\u7f13\u51b2\u533a\u8fb9\u754c\u5904\u7406\u548c\u4f20\u8f93\u5b8c\u6210\u68c0\u6d4b\u662f\u5e38\u89c1\u7684\u95ee\u9898\u6765\u6e90\u3002<\/p>\n<h4>3.1 DMA\u7f13\u51b2\u533a\u7ba1\u7406\u7b56\u7565<\/h4>\n<p>Improper buffer management is the root cause of many DMA-related issues.<\/p>\n<p>\u73af\u5f62\u7f13\u51b2\u533a\u5b9e\u73b0\u793a\u4f8b&#xff1a;<\/p>\n<p>#define DMA_BUFFER_SIZE 256<\/p>\n<p>typedef struct {<br \/>\n    uint8_t buffer[DMA_BUFFER_SIZE];<br \/>\n    volatile uint16_t head;  \/\/ \u5199\u6307\u9488<br \/>\n    volatile uint16_t tail;  \/\/ \u8bfb\u6307\u9488<br \/>\n} ring_buffer_t;<\/p>\n<p>volatile ring_buffer_t dma_rx_buffer;<\/p>\n<p>\/\/ DMA\u4f20\u8f93\u5b8c\u6210\u4e2d\u65ad\u56de\u8c03\u51fd\u6570<br \/>\nvoid HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {<br \/>\n    \/\/ \u66f4\u65b0\u5199\u6307\u9488<br \/>\n    uint16_t new_head &#061; (dma_rx_buffer.head &#043; 1) % DMA_BUFFER_SIZE;<\/p>\n<p>    \/\/ \u7f13\u51b2\u533a\u6ea2\u51fa\u68c0\u67e5<br \/>\n    if(new_head &#061;&#061; dma_rx_buffer.tail) {<br \/>\n        \/\/ \u5904\u7406\u6ea2\u51fa\u9519\u8bef<br \/>\n        handle_buffer_overflow();<br \/>\n    } else {<br \/>\n        dma_rx_buffer.head &#061; new_head;<br \/>\n    }<\/p>\n<p>    \/\/ \u91cd\u65b0\u542f\u52a8DMA\u4f20\u8f93<br \/>\n    HAL_UART_Receive_DMA(huart, &amp;dma_rx_buffer.buffer[new_head], 1);<br \/>\n}<\/p>\n<p>\u8fd9\u79cd\u5b9e\u73b0\u65b9\u5f0f\u867d\u7136\u7b80\u5355&#xff0c;\u4f46\u5728\u9ad8\u901f\u6570\u636e\u4f20\u8f93\u4e2d\u53ef\u80fd\u5b58\u5728\u98ce\u9669\u3002\u66f4\u7a33\u5065\u7684\u505a\u6cd5\u662f\u4f7f\u7528\u53cc\u7f13\u51b2\u533a\u6216\u52a8\u6001\u7f13\u51b2\u533a\u7ba1\u7406\u7b56\u7565\u3002<\/p>\n<h4>3.2 DMA\u4f20\u8f93\u5b8c\u6210\u68c0\u6d4b\u7684\u9677\u9631<\/h4>\n<p>DMA\u4f20\u8f93\u5b8c\u6210\u6807\u5fd7\u5e76\u4e0d\u603b\u662f\u53ef\u9760&#xff0c;\u7279\u522b\u662f\u5728\u9ad8\u8d1f\u8f7d\u6216\u4e2d\u65ad\u62e5\u6324\u7684\u7cfb\u7edf\u4e2d\u3002<\/p>\n<p>\u5e38\u89c1\u7684DMA\u5b8c\u6210\u68c0\u6d4b\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\u4f20\u8f93\u5b8c\u6210\u4e2d\u65ad\u4e22\u5931&#xff1a;\u7531\u4e8e\u4e2d\u65ad\u88ab\u7981\u7528\u6216\u4f18\u5148\u7ea7\u95ee\u9898<\/li>\n<li>\u90e8\u5206\u4f20\u8f93\u5b8c\u6210&#xff1a;DMA\u4f20\u8f93\u88ab\u610f\u5916\u4e2d\u6b62<\/li>\n<li>\u6807\u5fd7\u6e05\u9664\u65f6\u673a&#xff1a;\u8fc7\u65e9\u6216\u8fc7\u665a\u6e05\u9664\u72b6\u6001\u6807\u5fd7<\/li>\n<\/ul>\n<p>\/\/ \u7a33\u5065\u7684DMA\u4f20\u8f93\u72b6\u6001\u68c0\u67e5\u51fd\u6570<br \/>\nDMA_StatusTypeDef UART_DMA_CheckTransferComplete(UART_HandleTypeDef *huart) {<br \/>\n    \/\/ \u68c0\u67e5DMA\u4f20\u8f93\u5b8c\u6210\u6807\u5fd7<br \/>\n    if(__HAL_DMA_GET_FLAG(huart-&gt;hdmarx, __HAL_DMA_GET_TC_FLAG_INDEX(huart-&gt;hdmarx))) {<br \/>\n        \/\/ \u6e05\u9664\u6807\u5fd7\u4f4d<br \/>\n        __HAL_DMA_CLEAR_FLAG(huart-&gt;hdmarx, __HAL_DMA_GET_TC_FLAG_INDEX(huart-&gt;hdmarx));<\/p>\n<p>        \/\/ \u9a8c\u8bc1\u4f20\u8f93\u7684\u6570\u636e\u91cf<br \/>\n        uint16_t remaining &#061; __HAL_DMA_GET_COUNTER(huart-&gt;hdmarx);<br \/>\n        uint16_t transferred &#061; DMA_BUFFER_SIZE &#8211; remaining;<\/p>\n<p>        if(transferred &gt; 0) {<br \/>\n            return DMA_TRANSFER_COMPLETE;<br \/>\n        } else {<br \/>\n            return DMA_TRANSFER_ERROR;<br \/>\n        }<br \/>\n    }<br \/>\n    return DMA_TRANSFER_IN_PROGRESS;<br \/>\n}<\/p>\n<p>\u63d0\u793a&#xff1a;\u4e0d\u8981\u5b8c\u5168\u4f9d\u8d56DMA\u4f20\u8f93\u5b8c\u6210\u4e2d\u65ad&#xff0c;\u6700\u597d\u7ed3\u5408\u8f6e\u8be2\u548c\u8d85\u65f6\u673a\u5236\u6765\u786e\u4fdd\u4f20\u8f93\u53ef\u9760\u6027\u3002<\/p>\n<h4>3.3 \u5185\u5b58\u4e00\u81f4\u6027\u95ee\u9898\u7684\u8bca\u65ad\u4e0e\u89e3\u51b3<\/h4>\n<p>\u5728Cortex-M\u7cfb\u5217\u5904\u7406\u5668\u4e2d&#xff0c;DMA\u548cCPU\u8bbf\u95ee\u540c\u4e00\u5185\u5b58\u533a\u57df\u65f6\u53ef\u80fd\u5b58\u5728\u7f13\u5b58\u4e00\u81f4\u6027\u95ee\u9898\u3002\u867d\u7136STM32\u7cfb\u5217\u6ca1\u6709\u6570\u636e\u7f13\u5b58&#xff0c;\u4f46\u5199\u7f13\u51b2\u548c\u5185\u5b58\u8bbf\u95ee\u987a\u5e8f\u4ecd\u7136\u53ef\u80fd\u9020\u6210\u95ee\u9898\u3002<\/p>\n<p>\u786e\u4fdd\u5185\u5b58\u4e00\u81f4\u6027\u7684\u6700\u4f73\u5b9e\u8df5&#xff1a;<\/p>\n<li>\n<p>\u4f7f\u7528\u6b63\u786e\u7684\u5185\u5b58\u5c4f\u969c&#xff1a;<\/p>\n<p>\/\/ \u5728DMA\u4f20\u8f93\u524d\u786e\u4fdd\u6240\u6709\u5199\u64cd\u4f5c\u5df2\u5b8c\u6210<br \/>\n__DSB(); \/\/ \u6570\u636e\u540c\u6b65\u5c4f\u969c<br \/>\n__DMB(); \/\/ \u6570\u636e\u5185\u5b58\u5c4f\u969c<\/p>\n<\/li>\n<li>\n<p>\u907f\u514dCPU\u548cDMA\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u5185\u5b58\u533a\u57df&#xff1a;\u4f7f\u7528\u53cc\u7f13\u51b2\u533a\u65b9\u6848<\/p>\n<\/li>\n<li>\n<p>\u6b63\u786e\u914d\u7f6eMPU&#xff08;\u5982\u679c\u53ef\u7528&#xff09;&#xff1a;\u8bbe\u7f6e\u5185\u5b58\u533a\u57df\u4e3a\u8bbe\u5907\u7c7b\u578b\u6216\u975e\u7f13\u5b58<\/p>\n<\/li>\n<p>\u5728\u4e00\u6b21\u591a\u6838\u5904\u7406\u5668\u7684\u9879\u76ee\u4e2d&#xff0c;\u6211\u4eec\u9047\u5230\u4e86\u6781\u5176\u8be1\u5f02\u7684DMA\u6570\u636e\u635f\u574f\u95ee\u9898&#xff1a;\u6570\u636e\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u5076\u5c14\u4f1a\u51fa\u73b0\u4e2a\u522b\u5b57\u8282\u9519\u8bef\u3002\u6700\u7ec8\u53d1\u73b0\u662fCPU\u548cDMA\u540c\u65f6\u8bbf\u95ee\u7f13\u51b2\u533a\u9020\u6210\u7684\u7ade\u4e89\u6761\u4ef6&#xff0c;\u901a\u8fc7\u6dfb\u52a0\u8f6f\u4ef6\u5185\u5b58\u5c4f\u969c\u89e3\u51b3\u4e86\u95ee\u9898\u3002<\/p>\n<h3>4. \u7cfb\u7edf\u7ea7\u8bca\u65ad\u6d41\u7a0b\u4e0e\u5b9e\u6218\u6848\u4f8b<\/h3>\n<p>\u9762\u5bf9\u590d\u6742\u7684\u901a\u4fe1\u6545\u969c&#xff0c;\u9700\u8981\u6709\u4e00\u5957\u7cfb\u7edf\u5316\u7684\u8bca\u65ad\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u7ecf\u8fc7\u591a\u4e2a\u9879\u76ee\u9a8c\u8bc1\u7684\u6709\u6548\u8bca\u65ad\u6d41\u7a0b\u3002<\/p>\n<h4>4.1 \u5206\u5c42\u8bca\u65ad\u7b56\u7565<\/h4>\n<p>\u901a\u4fe1\u95ee\u9898\u8bca\u65ad\u5e94\u8be5\u4ece\u7269\u7406\u5c42\u5f00\u59cb&#xff0c;\u9010\u6b65\u5411\u4e0a\u5c42\u63a8\u8fdb&#xff1a;<\/p>\n<li>\n<p>\u7269\u7406\u5c42\u68c0\u67e5<\/p>\n<ul>\n<li>\u4fe1\u53f7\u8d28\u91cf&#xff1a;\u7535\u538b\u6c34\u5e73\u3001\u4e0a\u5347\u65f6\u95f4\u3001\u566a\u58f0<\/li>\n<li>\u7ebf\u8def\u8fde\u63a5&#xff1a;\u662f\u5426\u6b63\u786e\u3001\u662f\u5426\u7a33\u5b9a<\/li>\n<li>\u63a5\u5730\u8d28\u91cf&#xff1a;\u5730\u7ebf\u56de\u8def\u662f\u5426\u826f\u597d<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u534f\u8bae\u5c42\u9a8c\u8bc1<\/p>\n<ul>\n<li>\u6ce2\u7279\u7387\u51c6\u786e\u6027&#xff1a;\u4f7f\u7528\u793a\u6ce2\u5668\u6d4b\u91cf\u4f4d\u65f6\u95f4<\/li>\n<li>\u6570\u636e\u683c\u5f0f&#xff1a;\u6570\u636e\u4f4d\u3001\u505c\u6b62\u4f4d\u3001\u6821\u9a8c\u4f4d\u8bbe\u7f6e<\/li>\n<li>\u6d41\u63a7\u5236&#xff1a;\u662f\u5426\u5fc5\u8981&#xff0c;\u662f\u5426\u6b63\u786e\u914d\u7f6e<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8f6f\u4ef6\u5c42\u5206\u6790<\/p>\n<ul>\n<li>\u4e2d\u65ad\u5904\u7406&#xff1a;\u54cd\u5e94\u65f6\u95f4\u3001\u4f18\u5148\u7ea7\u914d\u7f6e<\/li>\n<li>\u7f13\u51b2\u533a\u7ba1\u7406&#xff1a;\u5927\u5c0f\u3001\u8fb9\u754c\u5904\u7406<\/li>\n<li>\u8d85\u65f6\u5904\u7406&#xff1a;\u91cd\u4f20\u673a\u5236\u3001\u9519\u8bef\u6062\u590d<\/li>\n<\/ul>\n<\/li>\n<h4>4.2 \u9ad8\u7ea7\u8c03\u8bd5\u5de5\u5177\u4e0e\u6280\u672f<\/h4>\n<p>\u9664\u4e86\u5e38\u89c4\u7684\u793a\u6ce2\u5668\u548c\u903b\u8f91\u5206\u6790\u4eea&#xff0c;\u8fd8\u6709\u4e00\u4e9b\u9ad8\u7ea7\u5de5\u5177\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u8bca\u65ad\u6548\u7387&#xff1a;<\/p>\n<p>\u8f6f\u4ef6\u5c42\u9762\u7684\u8c03\u8bd5\u6280\u672f&#xff1a;<\/p>\n<ul>\n<li>\u5b9e\u65f6\u8ddf\u8e2a&#xff1a;\u4f7f\u7528SWV\u6216ETM\u8ddf\u8e2a\u6570\u636e\u6d41\u548c\u5f02\u5e38<\/li>\n<li>\u6027\u80fd\u8ba1\u6570\u5668&#xff1a;\u5206\u6790\u4e2d\u65ad\u5ef6\u8fdf\u548cCPU\u8d1f\u8f7d<\/li>\n<li>\u5185\u5b58\u76d1\u89c6\u70b9&#xff1a;\u68c0\u6d4b\u7f13\u51b2\u533a\u6ea2\u51fa\u548c\u5185\u5b58\u635f\u574f<\/li>\n<\/ul>\n<p>\u786c\u4ef6\u5c42\u9762\u7684\u8c03\u8bd5\u5de5\u5177&#xff1a;<\/p>\n<ul>\n<li>\u534f\u8bae\u5206\u6790\u4eea&#xff1a;\u4e13\u95e8\u7528\u4e8e\u5206\u6790\u901a\u4fe1\u534f\u8bae<\/li>\n<li>\u7535\u6d41\u63a2\u9488&#xff1a;\u68c0\u6d4b\u7535\u6e90\u566a\u58f0\u5bf9\u901a\u4fe1\u7684\u5f71\u54cd<\/li>\n<li>\u6e29\u5ea6 chamber&#xff1a;\u9a8c\u8bc1\u6e29\u5ea6\u5bf9\u901a\u4fe1\u7a33\u5b9a\u6027\u7684\u5f71\u54cd<\/li>\n<\/ul>\n<h4>4.3 \u7efc\u5408\u5b9e\u6218\u6848\u4f8b&#xff1a;\u667a\u80fd\u5bb6\u5c45\u7f51\u5173\u901a\u4fe1\u6545\u969c\u8bca\u65ad<\/h4>\n<p>\u67d0\u667a\u80fd\u5bb6\u5c45\u7f51\u5173\u4ea7\u54c1\u5728\u91cf\u4ea7\u6d4b\u8bd5\u4e2d\u51fa\u73b0\u968f\u673a\u901a\u4fe1\u5931\u8d25&#xff0c;\u5931\u8d25\u7387\u7ea62%\u3002\u524d\u671f\u5206\u6790\u6392\u9664\u4e86\u8f6f\u4ef6\u914d\u7f6e\u548c\u786c\u4ef6\u8fde\u63a5\u95ee\u9898&#xff0c;\u9700\u8981\u6df1\u5165\u8bca\u65ad\u6839\u672c\u539f\u56e0\u3002<\/p>\n<p>\u8bca\u65ad\u8fc7\u7a0b&#xff1a;<\/p>\n<li>\n<p>\u4fe1\u53f7\u8d28\u91cf\u5206\u6790&#xff1a;\u4f7f\u7528\u793a\u6ce2\u5668\u53d1\u73b0RS-232\u4fe1\u53f7\u5b58\u5728\u8f7b\u5fae\u8fc7\u51b2&#xff0c;\u6dfb\u52a033\u03a9\u4e32\u8054\u7535\u963b\u6539\u5584\u4fe1\u53f7\u5b8c\u6574\u6027<\/p>\n<\/li>\n<li>\n<p>\u65f6\u5e8f\u5206\u6790&#xff1a;\u901a\u8fc7\u903b\u8f91\u5206\u6790\u4eea\u6355\u83b7\u53d1\u73b0&#xff0c;\u6bcf256\u4e2a\u5b57\u8282\u4f1a\u51fa\u73b0\u4e00\u6b21\u5fae\u5c0f\u65f6\u5e8f\u6296\u52a8&#xff0c;\u4e0e\u770b\u95e8\u72d7\u590d\u4f4d\u5468\u671f\u543b\u5408<\/p>\n<\/li>\n<li>\n<p>\u8f6f\u4ef6\u4f18\u5316&#xff1a;\u8c03\u6574\u770b\u95e8\u72d7\u590d\u4f4d\u65f6\u95f4&#xff0c;\u4f18\u5316\u4e2d\u65ad\u4f18\u5148\u7ea7&#xff0c;\u51cf\u5c11\u65f6\u5e8f\u5f71\u54cd<\/p>\n<\/li>\n<li>\n<p>\u6e29\u5ea6\u6d4b\u8bd5&#xff1a;\u5728\u9ad8\u4f4e\u6e29\u6d4b\u8bd5\u4e2d\u53d1\u73b0&#xff0c;\u4f4e\u6e29\u4e0b\u7535\u5e73\u8f6c\u6362\u82af\u7247\u54cd\u5e94\u65f6\u95f4\u589e\u52a015%&#xff0c;\u8c03\u6574\u4e86\u65f6\u5e8f\u5bb9\u9650\u53c2\u6570<\/p>\n<\/li>\n<p>\u6700\u7ec8\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p>\/\/ \u4f18\u5316\u540e\u7684\u4e32\u53e3\u521d\u59cb\u5316\u914d\u7f6e<br \/>\nvoid UART_Optimized_Init(void) {<br \/>\n    \/\/ \u964d\u4f4e\u6ce2\u7279\u7387\u4ee5\u51cf\u5c11\u65f6\u5e8f\u8bef\u5dee\u5f71\u54cd<br \/>\n    huart1.Init.BaudRate &#061; 57600; <\/p>\n<p>    \/\/ \u589e\u52a0\u505c\u6b62\u4f4d\u4ee5\u63d0\u9ad8\u566a\u58f0\u5bb9\u9650<br \/>\n    huart1.Init.StopBits &#061; UART_STOPBITS_2;<\/p>\n<p>    \/\/ \u4f7f\u80fd\u8fc7\u91c7\u6837\u4ee5\u63d0\u9ad8\u7cbe\u5ea6<br \/>\n    huart1.Init.OverSampling &#061; UART_OVERSAMPLING_16;<\/p>\n<p>    \/\/ \u914d\u7f6eDMA\u53cc\u7f13\u51b2\u533a<br \/>\n    HAL_UART_Receive_DMA(&amp;huart1, buffer1, BUFFER_SIZE);<br \/>\n    HAL_UARTEx_Receive_DoubleBuffer(&amp;huart1, &amp;buffer2, BUFFER_SIZE);<\/p>\n<p>    \/\/ \u8bbe\u7f6e\u66f4\u9ad8\u4f18\u5148\u7ea7\u7684\u4e2d\u65ad<br \/>\n    HAL_NVIC_SetPriority(USART1_IRQn, 1, 0);<br \/>\n}<\/p>\n<p>\u7ecf\u8fc7\u8fd9\u4e9b\u4f18\u5316&#xff0c;\u901a\u4fe1\u5931\u8d25\u7387\u4ece2%\u964d\u4f4e\u52300.01%\u4ee5\u4e0b&#xff0c;\u6ee1\u8db3\u4e86\u91cf\u4ea7\u8981\u6c42\u3002<\/p>\n<p>\u5d4c\u5165\u5f0f\u901a\u4fe1\u8c03\u8bd5\u662f\u4e00\u95e8\u7ed3\u5408\u4e86\u7535\u5b50\u5de5\u7a0b\u3001\u8f6f\u4ef6\u8bbe\u8ba1\u548c\u7cfb\u7edf\u5206\u6790\u7684\u7efc\u5408\u827a\u672f\u3002\u6700\u9690\u853d\u7684\u95ee\u9898\u5f80\u5f80\u9690\u85cf\u5728\u5404\u4e2a\u5c42\u6b21\u7684\u8fb9\u754c\u5904&#xff1a;\u786c\u4ef6\u4e0e\u8f6f\u4ef6\u7684\u8fb9\u754c\u3001\u4e0d\u540c\u82af\u7247\u4e4b\u95f4\u7684\u63a5\u53e3\u3001\u9884\u671f\u4e0e\u5b9e\u9645\u7684\u5dee\u5f02\u3002\u771f\u6b63\u9ad8\u6548\u7684\u8c03\u8bd5\u4e0d\u4ec5\u9700\u8981\u6df1\u539a\u7684\u7406\u8bba\u77e5\u8bc6&#xff0c;\u66f4\u9700\u8981\u4e30\u5bcc\u7684\u5b9e\u8df5\u7ecf\u9a8c\u548c\u7cfb\u7edf\u5316\u7684\u8bca\u65ad\u601d\u7ef4\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u9879\u76ee\u4e2d&#xff0c;\u6211\u517b\u6210\u4e86\u201c\u4ece\u4fe1\u53f7\u5c42\u9762\u601d\u8003\u201d\u7684\u4e60\u60ef\u2014\u2014\u4e0d\u7ba1\u95ee\u9898\u770b\u8d77\u6765\u591a\u4e48\u50cf\u8f6f\u4ef6\u95ee\u9898&#xff0c;\u603b\u662f\u5148\u7528\u793a\u6ce2\u5668\u68c0\u67e5\u5b9e\u9645\u4fe1\u53f7\u3002\u8fd9\u4e2a\u4e60\u60ef\u591a\u6b21\u5e2e\u52a9\u6211\u53d1\u73b0\u4e86\u9690\u85cf\u5728\u4ee3\u7801\u80cc\u540e\u7684\u786c\u4ef6\u95ee\u9898\u3002\u53e6\u5916&#xff0c;\u4fdd\u6301\u8be6\u7ec6\u7684\u8c03\u8bd5\u8bb0\u5f55\u4e5f\u6781\u5176\u91cd\u8981&#xff0c;\u90a3\u4e9b\u770b\u4f3c\u65e0\u5173\u7684\u7ec6\u8282\u5f80\u5f80\u5728\u540e\u671f\u6210\u4e3a\u89e3\u51b3\u95ee\u9898\u7684\u5173\u952e\u7ebf\u7d22\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5d4c\u5165\u5f0f\u901a\u4fe1\u4e2d\u7684\u2018\u9690\u5f62\u2019\u9519\u8bef&#xff1a;\u7535\u5e73\u8f6c\u6362\u3001\u65f6\u5e8f\u6296\u52a8\u4e0eDMA\u6ea2\u51fa\u7684\u5b9e\u6218\u8bca\u65ad<br \/>\n\u5728\u667a\u80fd\u786c\u4ef6\u91cf\u4ea7\u6d4b\u8bd5\u9636\u6bb5&#xff0c;\u968f\u673a\u901a\u4fe1\u5931\u8d25\u5f80\u5f80\u662f\u6700\u4ee4\u4eba\u5934\u75bc\u7684\u95ee\u9898\u4e4b\u4e00\u3002\u8868\u9762\u4e0a\u770b&#xff0c;\u4ee3\u7801\u903b\u8f91\u6b63\u786e\u3001\u786c\u4ef6\u8fde\u63a5\u65e0\u8bef&#xff0c;\u4f46\u5c31\u662f\u4f1a\u5728\u67d0\u4e9b\u4e0d\u53ef\u9884\u6d4b\u7684\u65f6\u523b\u51fa\u73b0\u6570\u636e\u4e22\u5931\u6216\u901a\u4fe1\u4e2d\u65ad\u3002\u8fd9\u7c7b\u95ee\u9898\u901a\u5e38\u9690\u85cf\u5728\u610f\u60f3\u4e0d\u5230\u7684\u89d2\u843d&#xff1a;\u53ef\u80fd\u662f\u7535\u5e73\u8f6c\u6362\u82af\u7247\u7684\u5fae\u5999\u7279\u6027&#xff0c;\u53ef\u80fd\u662f\u4e2d\u65ad\u54cd\u5e94\u65f6\u7684\u65f6\u5e8f\u6296\u52a8&#xff0c;\u4e5f\u53ef\u80fd\u662fDMA\u4f20\u8f93\u4e2d\u7684\u7f13\u51b2\u533a\u6ea2\u51fa\u3002\u8fd9\u4e9b\u201c\u9690\u5f62\u201d\u9519\u8bef\u4e0d\u4f1a\u5728\u5f00\u53d1\u9636\u6bb5\u8f7b<\/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":[7857,8581,8582,217],"topic":[],"class_list":["post-78042","post","type-post","status-publish","format-standard","hentry","category-server","tag-dma","tag-8581","tag-8582","tag-stm32"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5d4c\u5165\u5f0f\u901a\u4fe1\u4e2d\u7684\u2018\u9690\u5f62\u2019\u9519\u8bef\uff1a\u7535\u5e73\u8f6c\u6362\u3001\u65f6\u5e8f\u6296\u52a8\u4e0eDMA\u6ea2\u51fa\u7684\u5b9e\u6218\u8bca\u65ad - \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\/78042.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5d4c\u5165\u5f0f\u901a\u4fe1\u4e2d\u7684\u2018\u9690\u5f62\u2019\u9519\u8bef\uff1a\u7535\u5e73\u8f6c\u6362\u3001\u65f6\u5e8f\u6296\u52a8\u4e0eDMA\u6ea2\u51fa\u7684\u5b9e\u6218\u8bca\u65ad - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u5d4c\u5165\u5f0f\u901a\u4fe1\u4e2d\u7684\u2018\u9690\u5f62\u2019\u9519\u8bef&#xff1a;\u7535\u5e73\u8f6c\u6362\u3001\u65f6\u5e8f\u6296\u52a8\u4e0eDMA\u6ea2\u51fa\u7684\u5b9e\u6218\u8bca\u65ad 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