{"id":10021066,"date":"2025-11-06T02:37:04","date_gmt":"2025-11-05T18:37:04","guid":{"rendered":"https:\/\/itmax.cn\/?p=10021066"},"modified":"2025-11-06T02:37:04","modified_gmt":"2025-11-05T18:37:04","slug":"stm32f103-%e9%a9%b1%e5%8a%a8-ws281x-%e7%81%af%e7%8f%a0%e7%9a%84%e4%b8%89%e7%a7%8d%e6%96%b9%e5%bc%8f%e8%af%a6%e8%a7%a3%ef%bc%88%e6%99%ae%e9%80%9a-io-spidma-pwmdma%ef%bc%89%e3%80%90%e5%bc%80","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10021066","title":{"rendered":"STM32F103 \u9a71\u52a8 WS281x \u706f\u73e0\u7684\u4e09\u79cd\u65b9\u5f0f\u8be6\u89e3\uff08\u666e\u901a IO \/ SPI+DMA \/ PWM+DMA\uff09\u3010\u5f00\u6e90\u514d\u8d39\u3011"},"content":{"rendered":"<h2>STM32F103 \u9a71\u52a8 WS281x \u706f\u73e0\u7684\u4e09\u79cd\u65b9\u5f0f\u8be6\u89e3\uff08\u666e\u901a IO \/ SPI+DMA \/ PWM+DMA\uff09<\/h2>\n<p>WS281x\uff08\u5e38\u89c1\u578b\u53f7 WS2812B \/ SK6812\uff09\u662f\u4e00\u79cd\u96c6\u6210\u4e86 LED \u4e0e\u9a71\u52a8\u82af\u7247\u7684\u667a\u80fd RGB \u706f\u73e0\uff0c\u901a\u8fc7 <strong>\u5355\u603b\u7ebf\u534f\u8bae<\/strong> \u5b8c\u6210\u989c\u8272\u63a7\u5236\u3002\u8be5\u534f\u8bae\u867d\u7136\u53ea\u6709\u4e00\u4e2a\u6570\u636e\u7ebf\uff0c\u4f46\u5bf9 <strong>\u65f6\u5e8f\u8981\u6c42\u975e\u5e38\u4e25\u683c<\/strong>\uff0c\u8fd9\u4e5f\u662f\u9a71\u52a8\u65f6\u5e38\u88ab\u8ba4\u4e3a\u201c\u9ebb\u70e6\u201d\u7684\u539f\u56e0\u3002<\/p>\n<p>\u672c\u6587\u603b\u7ed3\u5728 <strong>STM32F103<\/strong> \u5e73\u53f0\u9a71\u52a8 WS281x \u7684 <strong>\u4e09\u79cd\u5e38\u7528\u65b9\u5f0f<\/strong>\uff1a<\/p>\n<ol>\n<li><strong>\u666e\u901a IO \u6a21\u62df\u65f6\u5e8f<\/strong><\/li>\n<li><strong>SPI + DMA \u6a21\u62df\u63a7\u5236\u6ce2\u5f62<\/strong><\/li>\n<li><strong>PWM + DMA \u8c03\u5360\u7a7a\u6bd4\u8f93\u51fa<\/strong><\/li>\n<\/ol>\n<p>\u5e76\u7ed3\u5408\u9879\u76ee\u5b9e\u8df5\uff0c\u7ed9\u51fa <strong>Example<\/strong> \u793a\u4f8b\u5de5\u7a0b\uff0c\u7528\u4e8e\u4e32\u53e3\/CAN \u63a7\u5236 LED\u3002<\/p>\n<hr>\n<h2>\u6e90\u7801\u5206\u4eab<\/h2>\n<p>\u7531\u4e8e\u5e73\u53f0\u8bf8\u591a\u9650\u5236\uff0c\u94fe\u63a5\u65e0\u6cd5\u76f4\u63a5\u5206\u4eab\u5e76\u5bb9\u6613\u5931\u6548\u3002\u6e90\u7801\u53ef\u5728\u4e0b\u65b9\u94fe\u63a5\u4e2d\u76f4\u63a5\u4e0b\u8f7d\u3002\u514d\u8d39\u5f00\u6e90<\/p>\n<blockquote><p><a href=\"https:\/\/link.segmentfault.com\/?enc=qOaiDb0mYBOMEPyIQcYqRQ%3D%3D.b9rlJio%2BZepZIBn7aCSYI2HaC28TvYCnZDPr9k69ASxbdLFsUs%2Bomd0GTaSbZbxHoLtBxR4fsLfU8%2F028wFdDw%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/blog.csdn.net\/weixin_52908342\/article\/details\/154457659<\/a><\/p><\/blockquote>\n<h3>1. WS281x \u901a\u4fe1\u65f6\u5e8f\u7b80\u4ecb<\/h3>\n<p>WS281x \u7684\u63a7\u5236\u4fe1\u53f7\u4e3a <strong>\u5355\u7ebf\u65f6\u5e8f\u7f16\u7801<\/strong>\uff0c\u6570\u636e\u683c\u5f0f\u4e3a\uff1a<\/p>\n<pre><code>G R B\n\u6bcf\u4e2a\u989c\u8272 8bit\uff0c\u5171 24bit<\/code><\/pre>\n<p>\u5173\u952e\u70b9\u5728\u4e8e <strong>\u9ad8\u7535\u5e73\u65f6\u95f4\u957f\u5ea6\u4ee3\u8868 0 \/ 1<\/strong>\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>\u7801\u503c<\/th>\n<th>\u9ad8\u7535\u5e73\u65f6\u95f4<\/th>\n<th>\u4f4e\u7535\u5e73\u65f6\u95f4<\/th>\n<th>\u5468\u671f<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0<\/td>\n<td>T0H \u2248 0.35 \u03bcs<\/td>\n<td>T0L \u2248 0.8 \u03bcs<\/td>\n<td>1.25 \u03bcs<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>T1H \u2248 0.7 \u03bcs<\/td>\n<td>T1L \u2248 0.6 \u03bcs<\/td>\n<td>1.25 \u03bcs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e14\u4e00\u5e27\u6570\u636e\u8f93\u51fa\u7ed3\u675f\u540e\u9700 <strong>&gt;50 \u03bcs \u7684\u4f4e\u7535\u5e73\u590d\u4f4d\u65f6\u95f4<\/strong>\u3002<\/p>\n<hr>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000047370962\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" title=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n<h3>2. \u666e\u901a IO \u6a21\u62df\u65f6\u5e8f\uff08Bit-Banging\uff09<\/h3>\n<h4>\u539f\u7406<\/h4>\n<p>\u76f4\u63a5\u901a\u8fc7 <code>GPIO_SetBits()<\/code> \/ <code>GPIO_ResetBits()<\/code> + <code>NOP \u5ef6\u65f6<\/code> \u6a21\u62df\u9ad8\u4f4e\u7535\u5e73\u3002<\/p>\n<h4>\u4f18\u70b9<\/h4>\n<ul>\n<li>\u5b9e\u73b0\u7b80\u5355<\/li>\n<li>\u65e0\u9700\u989d\u5916\u5916\u8bbe\u8d44\u6e90<\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li><strong>CPU \u5360\u7528\u9ad8<\/strong><\/li>\n<li><strong>\u4e2d\u65ad\u3001\u8c03\u5ea6\u4f1a\u7834\u574f\u65f6\u5e8f<\/strong><\/li>\n<li>LED \u6570\u91cf\u589e\u52a0\u540e\u5bb9\u6613\u5931\u7a33<\/li>\n<\/ul>\n<h4>\u9002\u7528\u573a\u666f<\/h4>\n<ul>\n<li>\u706f\u73e0\u5c11\u3001\u903b\u8f91\u7b80\u5355\u7684\u9879\u76ee\uff0c\u4f8b\u5982\u6d4b\u8bd5\u6837\u4f8b\u3001\u5c0f\u88c5\u9970\u3002<\/li>\n<\/ul>\n<hr>\n<h3>3. SPI + DMA \u6a21\u62df\u65f6\u5e8f<\/h3>\n<h4>\u539f\u7406<\/h4>\n<p>\u5229\u7528 <strong>SPI \u7684\u56fa\u5b9a\u65f6\u949f<\/strong>\u6765\u751f\u6210\u8fd1\u4f3c WS281x \u7684\u6ce2\u5f62\u3002<\/p>\n<p>\u6bcf\u4e00\u4f4d WS281x \u6570\u636e\u9700\u8981\u6620\u5c04\u4e3a <strong>8bit SPI \u6570\u636e<\/strong>\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>WS281x \u4f4d\u503c<\/th>\n<th>SPI \u8f93\u51fa\uff08\u793a\u4f8b\uff09<\/th>\n<th>HEX<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0<\/td>\n<td><code>11100000<\/code><\/td>\n<td><code>0xE0<\/code><\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td><code>11111000<\/code><\/td>\n<td><code>0xF8<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>SPI \u65f6\u949f\u8bbe\u7f6e\u4e3a <strong>SPI \u5206\u9891\u540e \u2248 2.4MHz<\/strong>\uff08\u53ef\u6839\u636e\u6ce2\u5f62\u5fae\u8c03\uff09\u3002<\/p>\n<h4>\u4f18\u70b9<\/h4>\n<ul>\n<li>CPU \u4e0d\u53c2\u4e0e\u4f20\u8f93<\/li>\n<li>\u8f93\u51fa\u6ce2\u5f62\u7a33\u5b9a\uff0c\u4e0d\u53d7\u4e2d\u65ad\u5f71\u54cd<\/li>\n<li>\u9002\u5408\u5927\u91cf\u706f\u73e0<\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u4e0d\u540c MCU \/ Freq \u4e0b\u9700\u8981\u91cd\u65b0\u8ba1\u7b97 SPI \u65f6\u949f\u4e0e\u7f16\u7801<\/li>\n<li>\u6570\u636e\u91cf\u6bd4\u539f\u59cb\u50cf\u7d20\u6570\u636e <strong>\u81a8\u80c0 8 \u500d<\/strong><\/li>\n<\/ul>\n<h4>\u4f7f\u7528\u6d41\u7a0b<\/h4>\n<pre><code>RGB \u6570\u636e \u2192 \u6309\u4f4d\u7f16\u7801\u6210 SPI buffer \u2192 SPI DMA \u53d1\u9001 \u2192 \u7ed3\u675f\u540e\u5ef6\u65f6\u590d\u4f4d<\/code><\/pre>\n<hr>\n<h3>4. PWM + DMA \u8c03\u5360\u7a7a\u6bd4\u65b9\u5f0f\uff08\u63a8\u8350\uff09<\/h3>\n<h4>\u539f\u7406<\/h4>\n<p>\u914d\u7f6e <strong>PWM \u8f93\u51fa\u9891\u7387 = 800kHz<\/strong>\uff08\u5373 1.25 \u03bcs \u5468\u671f\uff09\uff0c\u901a\u8fc7\u6539\u53d8 <strong>CCR \u5360\u7a7a\u6bd4<\/strong> \u6765\u63a7\u5236\u9ad8\u7535\u5e73\u957f\u5ea6\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>WS281x \u4f4d\u503c<\/th>\n<th>\u5360\u7a7a\u6bd4<\/th>\n<th>\u793a\u4f8b CCR \u503c\uff08TIM_ARR=100\uff09<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0<\/td>\n<td>~33%<\/td>\n<td>33<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>~66%<\/td>\n<td>66<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>DMA \u8d1f\u8d23\u81ea\u52a8\u628a\u6240\u6709 <strong>CCR \u6570\u636e<\/strong> \u4f9d\u6b21\u5199\u5165\u5b9a\u65f6\u5668\u3002<\/p>\n<h4>\u4f18\u70b9\uff08\u6700\u4f18\u89e3\uff09<\/h4>\n<ul>\n<li>\u6ce2\u5f62\u7cbe\u786e\u3001\u7a33\u5b9a\u6027\u9ad8<\/li>\n<li>\u6570\u636e\u91cf\u8f83\u5c0f<\/li>\n<li>\u9002\u5408 <strong>\u5927\u89c4\u6a21\u706f\u5e26<\/strong><\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u4f9d\u8d56\u5b9a\u65f6\u5668\u8d44\u6e90<\/li>\n<li>\u9700\u8981\u6b63\u786e\u5904\u7406 DMA \u4f20\u8f93\u5b8c\u6210\u4e2d\u65ad\u907f\u514d\u663e\u793a\u5f02\u5e38<\/li>\n<\/ul>\n<hr>\n<h3>5. Example \u793a\u4f8b\u5de5\u7a0b\u8bf4\u660e<\/h3>\n<p>\u5728\u9879\u76ee\u7684 <code>Example<\/code> \u6587\u4ef6\u5939\u4e2d\u63d0\u4f9b\u4e24\u4e2a\u5b8c\u6574\u5b9e\u4f8b\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>\u793a\u4f8b<\/th>\n<th>\u901a\u4fe1\u65b9\u5f0f<\/th>\n<th>\u8bf4\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Example 1<\/td>\n<td>\u4e32\u53e3\u63a7\u5236 LED<\/td>\n<td>\u901a\u8fc7\u4e32\u53e3\u547d\u4ee4\u63a7\u5236 LED \u989c\u8272\u4e0e\u6a21\u5f0f<\/td>\n<\/tr>\n<tr>\n<td>Example 2<\/td>\n<td>CAN \u56de\u73af\u63a7\u5236 LED<\/td>\n<td>\u4f7f\u7528\u4e32\u53e3\u53d1\u9001 \u2192 CAN \u56de\u73af\u63a5\u6536 \u2192 \u63a7\u5236 LED<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7b2c\u4e8c\u4e2a\u4f8b\u5b50\u7528\u4e8e <strong>\u5355\u673a\u8c03\u8bd5<\/strong>\uff0c\u65e0\u9700\u4e24\u5757\u677f\u5b50\uff0c\u5373\u53ef\u9a8c\u8bc1 CAN \u9a71\u52a8 LED \u662f\u5426\u6b63\u5e38\u3002<\/p>\n<hr>\n<h3>\u603b\u7ed3<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u9a71\u52a8\u65b9\u5f0f<\/th>\n<th>\u4f18\u70b9<\/th>\n<th>\u7f3a\u70b9<\/th>\n<th>\u9002\u7528\u573a\u666f<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u666e\u901a IO<\/td>\n<td>\u7b80\u5355\u76f4\u63a5<\/td>\n<td>\u65f6\u5e8f\u4e0d\u7a33\u5b9a \/ CPU \u5360\u7528\u9ad8<\/td>\n<td>\u7b80\u5355\u706f\u5149\uff0c\u8c03\u8bd5\u7528<\/td>\n<\/tr>\n<tr>\n<td>SPI+DMA<\/td>\n<td>\u6ce2\u5f62\u7a33\u5b9a \/ CPU \u4f4e\u5360\u7528<\/td>\n<td>\u6570\u636e\u81a8\u80c0 \/ SPI \u65f6\u949f\u9700\u7cbe\u8c03<\/td>\n<td>\u4e2d\u7b49\u6570\u91cf\u706f\u5e26<\/td>\n<\/tr>\n<tr>\n<td>PWM+DMA<\/td>\n<td><strong>\u6700\u7a33\u5b9a \/ \u6700\u901a\u7528 \/ \u6269\u5c55\u6027\u5f3a<\/strong><\/td>\n<td>\u9700\u8981\u5b9a\u65f6\u5668\u8d44\u6e90<\/td>\n<td><strong>\u5927\u6279\u91cf\u706f\u5e26 \/ \u6b63\u5f0f\u9879\u76ee<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5728\u5b9e\u9645\u5546\u4e1a\u9879\u76ee\u4e2d\uff0c<strong>\u4f18\u5148\u63a8\u8350 PWM+DMA \u9a71\u52a8\u65b9\u6848<\/strong>\u3002<\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u5206\u522b\u4ecb\u7ecd\u4e86\u5728 STM32F103 \u5e73\u53f0\u4e0a\u9a71\u52a8 WS281x \u706f\u73e0\u7684\u4e09\u79cd\u5e38\u89c1\u65b9\u5f0f\uff1a\u666e\u901a IO \u6a21\u62df\u65f6\u5e8f\u3001SPI+DMA \u7f16\u7801\u8f93\u51fa\u4ee5\u53ca PWM+DMA \u8c03\u5360\u7a7a\u6bd4\u65b9\u5f0f\u3002\u5176\u4e2d\uff0c\u666e\u901a IO \u65b9\u6cd5\u5b9e\u73b0\u7b80\u5355\u4f46\u65f6\u5e8f\u7a33\u5b9a\u6027\u5dee\uff0c\u66f4\u9002\u7528\u4e8e\u6d4b\u8bd5\u9a8c\u8bc1\uff1bSPI+DMA \u53ef\u4ee5\u663e\u8457\u964d\u4f4e CPU \u5360\u7528\uff0c\u8f93\u51fa\u6ce2\u5f62\u7a33\u5b9a\uff0c\u4f46\u9700\u8981\u8fdb\u884c\u6570\u636e\u81a8\u80c0\u7f16\u7801\uff1b\u800c PWM+DMA \u65b9\u6848\u53ef\u4ee5\u5728\u786c\u4ef6\u5c42\u9762\u7cbe\u51c6\u63a7\u5236\u9ad8\u7535\u5e73\u5bbd\u5ea6\uff0c\u5177\u5907\u6700\u4f18\u79c0\u7684\u65f6\u5e8f\u7a33\u5b9a\u6027\u548c\u6269\u5c55\u80fd\u529b\uff0c\u662f\u5b9e\u9645\u5de5\u7a0b\u4e2d\u6700\u63a8\u8350\u7684\u65b9\u6848\u3002\u914d\u5408 DMA \u81ea\u52a8\u4f20\u8f93\uff0c\u53ef\u8f7b\u677e\u9a71\u52a8\u5927\u91cf\u706f\u73e0\u800c\u4e0d\u5360\u7528 CPU \u8d44\u6e90\u3002\u5b9e\u9645\u9879\u76ee\u4e2d\u5e94\u6839\u636e\u8d44\u6e90\u5360\u7528\u3001\u706f\u73e0\u6570\u91cf\u4ee5\u53ca\u7cfb\u7edf\u5b9e\u65f6\u6027\u8981\u6c42\u9009\u62e9\u5408\u9002\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u5e76\u6839\u636e\u793a\u4f8b\u5de5\u7a0b\u8fdb\u884c\u7075\u6d3b\u5e94\u7528\u4e0e\u62d3\u5c55\u3002<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000047370960\">https:\/\/segmentfault.com\/a\/1190000047370960<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>STM32F103 \u9a71\u52a8 WS281x \u706f\u73e0\u7684\u4e09\u79cd\u65b9\u5f0f\u8be6\u89e3\uff08\u666e\u901a IO \/ SPI+DMA \/ PWM+DMA [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10021066","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10021066","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10021066"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10021066\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10021066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10021066"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10021066"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}