{"id":115254,"date":"2026-10-11T16:09:35","date_gmt":"2026-10-11T08:09:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/115254.html"},"modified":"2026-10-11T16:09:35","modified_gmt":"2026-10-11T08:09:35","slug":"imx6ull-%e6%9d%82%e9%a1%b9%e8%ae%be%e5%a4%87-led-%e9%a9%b1%e5%8a%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/115254.html","title":{"rendered":"IMX6ULL \u6742\u9879\u8bbe\u5907 LED \u9a71\u52a8"},"content":{"rendered":"<h4>\u4ece\u7528\u6237\u7a7a\u95f4\u5230 GPIO \u5bc4\u5b58\u5668&#xff1a;IMX6ULL \u6742\u9879\u8bbe\u5907 LED \u9a71\u52a8\u5b8c\u6574\u89e3\u6790<\/h4>\n<p>\u8fd9\u7bc7\u535a\u5ba2\u6574\u7406\u81ea\u6211\u4eec\u4e4b\u524d\u9010\u884c\u62c6\u89e3\u7684 LED \u9a71\u52a8\u4ee3\u7801\u3002\u5b83\u5b9e\u73b0\u7684\u662f&#xff1a;\u7528\u6237\u7a7a\u95f4\u5411 \/dev\/led_misc \u5199\u5165 0 \u6216 1&#xff0c;\u9a71\u52a8\u901a\u8fc7 GPIO \u5bc4\u5b58\u5668\u63a7\u5236 IMX6ULL \u4e0a LED \u7684\u4eae\u706d\u3002\u4ee3\u7801\u6ca1\u6709\u786c\u7f16\u7801\u5bc4\u5b58\u5668\u5730\u5740&#xff0c;\u800c\u662f\u901a\u8fc7\u8bbe\u5907\u6811\u8282\u70b9\u548c of_iomap \u5b8c\u6210\u5730\u5740\u6620\u5c04\u3002<\/p>\n<h4>\u4e00\u3001\u4e3a\u4ec0\u4e48\u7528 misc \u8bbe\u5907&#xff1f;<\/h4>\n<p>Linux \u8bbe\u5907\u5206\u4e3a\u5b57\u7b26\u8bbe\u5907\u3001\u5757\u8bbe\u5907\u548c\u7f51\u7edc\u8bbe\u5907\u3002LED \u5c5e\u4e8e\u5178\u578b\u7684\u5b57\u7b26\u8bbe\u5907&#xff1a;\u6309\u5b57\u8282\u6d41\u8bfb\u5199&#xff0c;\u4e0d\u9700\u8981\u968f\u673a\u5bfb\u5740\u3002<\/p>\n<p>\u4f20\u7edf\u5b57\u7b26\u8bbe\u5907\u9700\u8981\u81ea\u5df1\u7533\u8bf7\u4e3b\u8bbe\u5907\u53f7\u3001\u521b\u5efa\u8bbe\u5907\u8282\u70b9\u3001\u7ba1\u7406 cdev\u3002\u800c misc \u8bbe\u5907\u662f\u5b57\u7b26\u8bbe\u5907\u7684\u7b80\u5316\u7248\u672c&#xff0c;\u6240\u6709 misc \u8bbe\u5907\u5171\u4eab\u4e3b\u8bbe\u5907\u53f7 10&#xff0c;\u53ea\u9700\u6307\u5b9a\u6b21\u8bbe\u5907\u53f7\u548c\u8bbe\u5907\u540d&#xff0c;\u6ce8\u518c\u540e\u5185\u6838\u4f1a\u81ea\u52a8\u5728 \/dev \u4e0b\u751f\u6210\u8bbe\u5907\u8282\u70b9\u3002<\/p>\n<p>\u5bf9\u4e8e LED\u3001\u8702\u9e23\u5668\u3001\u6309\u952e\u8fd9\u7c7b\u529f\u80fd\u7b80\u5355\u7684\u5916\u8bbe&#xff0c;misc \u6846\u67b6\u80fd\u7701\u53bb\u5927\u91cf\u6a21\u677f\u4ee3\u7801\u3002<\/p>\n<h4>\u4e8c\u3001\u8bbe\u5907\u6811&#xff1a;\u786c\u4ef6\u4fe1\u606f\u7684\u201c\u8bf4\u660e\u4e66\u201d<\/h4>\n<p>\u9a71\u52a8\u91cc\u6700\u5173\u952e\u7684\u8f6c\u53d8\u662f&#xff1a;\u4e0d\u518d\u786c\u7f16\u7801\u5bc4\u5b58\u5668\u5730\u5740\u3002\u6211\u4eec\u5728\u8bbe\u5907\u6811\u4e2d\u5b9a\u4e49\u4e00\u4e2a \/myled0 \u8282\u70b9&#xff0c;\u7528 reg \u5c5e\u6027\u63cf\u8ff0\u56db\u4e2a\u5bc4\u5b58\u5668&#xff1a;<\/p>\n<p>\/myled0 {<br \/>\n    reg &#061; &lt;0x020E0068 0x04   \/* \u5f15\u811a\u590d\u7528\u63a7\u5236\u5bc4\u5b58\u5668 *\/<br \/>\n           0x020E02F4 0x04   \/* \u5f15\u811a\u7535\u6c14\u5c5e\u6027\u5bc4\u5b58\u5668 *\/<br \/>\n           0x0209C004 0x04   \/* GPIO1_GDIR \u65b9\u5411\u5bc4\u5b58\u5668 *\/<br \/>\n           0x0209C000 0x04&gt;; \/* GPIO1_DR \u6570\u636e\u5bc4\u5b58\u5668 *\/<br \/>\n};<\/p>\n<p>reg \u91cc\u6bcf\u4e00\u5bf9 &lt;\u5730\u5740 \u957f\u5ea6&gt; \u662f\u4e00\u6bb5\u3002\u9a71\u52a8\u901a\u8fc7 of_iomap(plednode, index) \u6309\u7d22\u5f15\u53d6\u51fa\u5bf9\u5e94\u6bb5&#xff0c;\u5b8c\u6210\u7269\u7406\u5730\u5740\u5230\u5185\u6838\u865a\u62df\u5730\u5740\u7684\u6620\u5c04\u3002<\/p>\n<h4>\u4e09\u3001\u9a71\u52a8\u521d\u59cb\u5316&#xff1a;\u6ce8\u518c\u8bbe\u5907 &#043; \u914d\u7f6e\u786c\u4ef6<\/h4>\n<p>\u6a21\u5757\u52a0\u8f7d\u65f6&#xff0c;led_misc_init \u4f9d\u6b21\u5b8c\u6210&#xff1a;<\/p>\n<li>\u6ce8\u518c misc \u8bbe\u5907&#xff1a;misc_register(&amp;led_misc) \u751f\u6210 \/dev\/led_misc\u3002<\/li>\n<li>\u67e5\u627e\u8bbe\u5907\u6811\u8282\u70b9&#xff1a;of_find_node_by_path(&#034;\/myled0&#034;) \u5b9a\u4f4d\u786c\u4ef6\u63cf\u8ff0\u3002<\/li>\n<li>\u6620\u5c04\u56db\u4e2a\u5bc4\u5b58\u5668&#xff1a;\u901a\u8fc7 of_iomap \u5206\u522b\u6620\u5c04\u590d\u7528\u63a7\u5236\u3001PAD \u914d\u7f6e\u3001\u65b9\u5411\u3001\u6570\u636e\u5bc4\u5b58\u5668\u3002<\/li>\n<li>\u521d\u59cb\u5316 GPIO&#xff1a;\n<ul>\n<li>\u5c06\u5f15\u811a\u590d\u7528\u4e3a GPIO \u6a21\u5f0f&#xff1b;<\/li>\n<li>\u914d\u7f6e PAD \u7535\u6c14\u5c5e\u6027&#xff1b;<\/li>\n<li>\u8bbe\u7f6e GPIO1_IO03 \u4e3a\u8f93\u51fa&#xff1b;<\/li>\n<li>\u9ed8\u8ba4\u8f93\u51fa\u9ad8\u7535\u5e73&#xff0c;LED \u7184\u706d\u3002<\/li>\n<\/ul>\n<\/li>\n<h4>\u56db\u3001led_write&#xff1a;\u7528\u6237\u7a7a\u95f4\u5230\u786c\u4ef6\u7684\u6865\u6881<\/h4>\n<p>\u8fd9\u662f\u6574\u4e2a\u9a71\u52a8\u7684\u6838\u5fc3\u4ea4\u4e92\u51fd\u6570\u3002\u5b83\u7684\u539f\u578b\u662f&#xff1a;<\/p>\n<p>static ssize_t led_write(struct file *fp, const char __user *puser, size_t n, loff_t *off)<\/p>\n<p>\u8fd9\u4e9b\u53c2\u6570\u4e0d\u662f\u9a71\u52a8\u81ea\u5df1\u4f20\u7684&#xff0c;\u800c\u662f\u5185\u6838 VFS \u5c42\u5728\u7528\u6237\u8c03\u7528 write() \u65f6\u81ea\u52a8\u586b\u5145\u7684&#xff1a;<\/p>\n<table>\n<tr>\u53c2\u6570\u6765\u6e90<\/tr>\n<tbody>\n<tr>\n<td>fp<\/td>\n<td>\u5185\u6838\u6839\u636e\u6587\u4ef6\u63cf\u8ff0\u7b26\u627e\u5230\u7684 struct file<\/td>\n<\/tr>\n<tr>\n<td>puser<\/td>\n<td>\u7528\u6237\u7a7a\u95f4 write(fd, buf, count) \u4e2d\u7684 buf<\/td>\n<\/tr>\n<tr>\n<td>n<\/td>\n<td>\u7528\u6237\u7a7a\u95f4 write \u4e2d\u7684 count<\/td>\n<\/tr>\n<tr>\n<td>off<\/td>\n<td>\u5185\u6838\u7ef4\u62a4\u7684\u6587\u4ef6\u8bfb\u5199\u504f\u79fb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8c03\u7528\u94fe\u5982\u4e0b&#xff1a;<\/p>\n<p>\u7528\u6237: write(fd, &amp;val, sizeof(val))<br \/>\n  \u2193<br \/>\nglibc: \u89e6\u53d1 write \u7cfb\u7edf\u8c03\u7528<br \/>\n  \u2193<br \/>\n\u5185\u6838: sys_write \u2192 vfs_write \u2192 fops-&gt;write<br \/>\n  \u2193<br \/>\n\u9a71\u52a8: led_write(fp, puser, n, off)<\/p>\n<p>\u51fd\u6570\u5185\u90e8\u901a\u8fc7 copy_from_user \u4ece\u7528\u6237\u6001\u62f7\u8d1d\u6570\u636e&#xff0c;\u7136\u540e\u6839\u636e\u503c\u64cd\u4f5c GPIO \u6570\u636e\u5bc4\u5b58\u5668\u7684 bit3&#xff1a;<\/p>\n<ul>\n<li>\u5199\u5165 1&#xff1a;\u6e05\u9664 bit3&#xff0c;\u8f93\u51fa\u4f4e\u7535\u5e73&#xff0c;\u70b9\u4eae LED&#xff1b;<\/li>\n<li>\u5199\u5165 0&#xff1a;\u7f6e\u4f4d bit3&#xff0c;\u8f93\u51fa\u9ad8\u7535\u5e73&#xff0c;\u7184\u706d LED\u3002<\/li>\n<\/ul>\n<h4>\u4e94\u3001file_operations \u4e0e\u51fd\u6570\u6307\u9488\u56de\u8c03<\/h4>\n<p>\u9a71\u52a8\u901a\u8fc7 file_operations \u628a led_write \u6302\u5230 .write \u4e0a&#xff1a;<\/p>\n<p>static struct file_operations fops &#061; {<br \/>\n    .owner &#061; THIS_MODULE,<br \/>\n    .write &#061; led_write,<br \/>\n};<\/p>\n<p>fops \u662f\u4e00\u7ec4\u51fd\u6570\u6307\u9488\u7684\u96c6\u5408&#xff0c;\u5b9a\u4e49\u4e86\u8bbe\u5907\u5bf9\u5916\u66b4\u9732\u7684\u64cd\u4f5c\u63a5\u53e3\u3002 \u7528\u6237\u7a7a\u95f4\u8c03\u7528 write() \u65f6&#xff0c;VFS \u6cbf\u7740\u6307\u9488\u627e\u5230\u4f60\u7684 led_write \u5e76\u4f20\u5165\u53c2\u6570\u3002\u8fd9\u5c31\u662f Linux \u9a71\u52a8\u4e2d\u56de\u8c03\u51fd\u6570 &#043; \u51fd\u6570\u6307\u9488\u7684\u6838\u5fc3\u8bbe\u8ba1\u6a21\u5f0f\u3002<\/p>\n<h4>\u516d\u3001\u4ee3\u7801\u6539\u8fdb\u5efa\u8bae<\/h4>\n<table>\n<tr>\u95ee\u9898\u5efa\u8bae<\/tr>\n<tbody>\n<tr>\n<td>\u5931\u8d25\u8fd4\u56de -1<\/td>\n<td>\u6539\u4e3a\u8fd4\u56de -EFAULT<\/td>\n<\/tr>\n<tr>\n<td>\u6210\u529f\u8fd4\u56de 0<\/td>\n<td>\u5efa\u8bae\u8fd4\u56de n&#xff0c;\u8868\u793a\u5b9e\u9645\u5199\u5165\u5b57\u8282\u6570<\/td>\n<\/tr>\n<tr>\n<td>of_iomap \u65e0\u68c0\u67e5<\/td>\n<td>\u6bcf\u6b21\u6620\u5c04\u540e\u5224\u65ad\u8fd4\u56de\u503c\u662f\u5426\u4e3a NULL<\/td>\n<\/tr>\n<tr>\n<td>\u9000\u51fa\u672a\u91ca\u653e\u6620\u5c04<\/td>\n<td>led_misc_exit \u4e2d\u5e94\u5bf9\u56db\u4e2a\u5730\u5740\u8c03\u7528 iounmap<\/td>\n<\/tr>\n<tr>\n<td>\u8282\u70b9\u5f15\u7528\u672a\u91ca\u653e<\/td>\n<td>\u7528\u5b8c\u540e\u8c03\u7528 of_node_put(plednode)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>\u4e03\u3001\u6d4b\u8bd5\u65b9\u6cd5<\/h4>\n<p>insmod led_misc.ko<br \/>\nls \/dev\/led_misc<br \/>\necho -ne &#034;\\\\x01&#034; &gt; \/dev\/led_misc   # \u70b9\u4eae<br \/>\necho -ne &#034;\\\\x00&#034; &gt; \/dev\/led_misc   # \u7184\u706d<br \/>\nrmmod led_misc<\/p>\n<h4>\u516b\u3001\u603b\u7ed3<\/h4>\n<p>\u8fd9\u5957\u4ee3\u7801\u4e32\u8054\u4e86 Linux \u9a71\u52a8\u5f00\u53d1\u7684\u51e0\u4e2a\u6838\u5fc3\u6982\u5ff5&#xff1a;<\/p>\n<ul>\n<li>misc \u6846\u67b6\u7b80\u5316\u5b57\u7b26\u8bbe\u5907\u6ce8\u518c&#xff1b;<\/li>\n<li>\u8bbe\u5907\u6811\u5b9e\u73b0\u786c\u4ef6\u63cf\u8ff0\u4e0e\u9a71\u52a8\u4ee3\u7801\u89e3\u8026&#xff1b;<\/li>\n<li>of_iomap \u5b8c\u6210\u7269\u7406\u5730\u5740\u5230\u865a\u62df\u5730\u5740\u7684\u5b89\u5168\u6620\u5c04&#xff1b;<\/li>\n<li>file_operations \u901a\u8fc7\u51fd\u6570\u6307\u9488\u5efa\u7acb\u7528\u6237\u7a7a\u95f4\u4e0e\u9a71\u52a8\u7684\u4ea4\u4e92\u901a\u9053&#xff1b;<\/li>\n<li>copy_from_user \u4fdd\u8bc1\u5185\u6838\u6001\u4e0e\u7528\u6237\u6001\u4e4b\u95f4\u7684\u6570\u636e\u5b89\u5168\u62f7\u8d1d\u3002<\/li>\n<\/ul>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>\u4ece\u7528\u6237\u7a7a\u95f4\u5230 GPIO \u5bc4\u5b58\u5668&#xff1a;IMX6ULL \u6742\u9879\u8bbe\u5907 LED \u9a71\u52a8\u5b8c\u6574\u89e3\u6790\u8fd9\u7bc7\u535a\u5ba2\u6574\u7406\u81ea\u6211\u4eec\u4e4b\u524d\u9010\u884c\u62c6\u89e3\u7684 LED \u9a71\u52a8\u4ee3\u7801\u3002\u5b83\u5b9e\u73b0\u7684\u662f&#xff1a;\u7528\u6237\u7a7a\u95f4\u5411 \/dev\/led_misc \u5199\u5165 0 \u6216 1&#xff0c;\u9a71\u52a8\u901a\u8fc7 GPIO \u5bc4\u5b58\u5668\u63a7\u5236 IMX6ULL \u4e0a LED \u7684\u4eae\u706d\u3002\u4ee3\u7801\u6ca1\u6709\u786c\u7f16\u7801\u5bc4\u5b58\u5668\u5730\u5740&#xff0c;\u800c\u662f\u901a\u8fc7\u8bbe\u5907\u6811\u8282\u70b9\u548c of_iomap \u5b8c\u6210\u5730\u5740\u6620\u5c04\u3002\u4e00\u3001\u4e3a\u4ec0\u4e48\u7528 misc \u8bbe\u5907&#xff1f;Linux \u8bbe\u5907\u5206\u4e3a\u5b57\u7b26\u8bbe\u5907\u3001\u5757<\/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":[217,270,269],"topic":[],"class_list":["post-115254","post","type-post","status-publish","format-standard","hentry","category-server","tag-stm32","tag-270","tag-269"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>IMX6ULL \u6742\u9879\u8bbe\u5907 LED \u9a71\u52a8 - \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\/115254.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"IMX6ULL \u6742\u9879\u8bbe\u5907 LED \u9a71\u52a8 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u4ece\u7528\u6237\u7a7a\u95f4\u5230 GPIO \u5bc4\u5b58\u5668&#xff1a;IMX6ULL \u6742\u9879\u8bbe\u5907 LED \u9a71\u52a8\u5b8c\u6574\u89e3\u6790\u8fd9\u7bc7\u535a\u5ba2\u6574\u7406\u81ea\u6211\u4eec\u4e4b\u524d\u9010\u884c\u62c6\u89e3\u7684 LED \u9a71\u52a8\u4ee3\u7801\u3002\u5b83\u5b9e\u73b0\u7684\u662f&#xff1a;\u7528\u6237\u7a7a\u95f4\u5411 \/dev\/led_misc \u5199\u5165 0 \u6216 1&#xff0c;\u9a71\u52a8\u901a\u8fc7 GPIO \u5bc4\u5b58\u5668\u63a7\u5236 IMX6ULL \u4e0a LED 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