{"id":32967,"date":"2025-04-26T10:26:32","date_gmt":"2025-04-26T02:26:32","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/32967.html"},"modified":"2025-04-26T10:26:32","modified_gmt":"2025-04-26T02:26:32","slug":"%e5%b5%8c%e5%85%a5%e5%bc%8flinux%e9%a9%b1%e5%8a%a8%e5%bc%80%e5%8f%91%ef%bc%9aled%e5%ae%9e%e9%aa%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/32967.html","title":{"rendered":"\u5d4c\u5165\u5f0fLinux\u9a71\u52a8\u5f00\u53d1\uff1aLED\u5b9e\u9a8c"},"content":{"rendered":"<p>\u5728\u5d4c\u5165\u5f0fLinux\u9a71\u52a8\u5f00\u53d1\u4e2d&#xff0c;LED\u5b9e\u9a8c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0&#xff0c;\u4e3b\u8981\u5305\u62ec\u8bbe\u5907\u6811\u4e0b\u7684LED\u5b9e\u9a8c\u3001\u65b0\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u7684LED\u5b9e\u9a8c\u548cGPIO\u5b50\u7cfb\u7edf\u7684LED\u5b9e\u9a8c\u3002\u8fd9\u4e09\u79cd\u65b9\u5f0f\u5728\u786c\u4ef6\u8d44\u6e90\u7ba1\u7406\u3001\u9a71\u52a8\u67b6\u6784\u548c\u5f00\u53d1\u6d41\u7a0b\u4e0a\u6709\u663e\u8457\u533a\u522b&#xff0c;\u4e0b\u9762\u4ece\u591a\u4e2a\u7ef4\u5ea6\u8fdb\u884c\u5bf9\u6bd4\u5206\u6790&#xff1a;<\/p>\n<hr \/>\n<h4>1. \u786c\u4ef6\u8d44\u6e90\u7ba1\u7406\u65b9\u5f0f<\/h4>\n<ul>\n<li>\n<p>\u65b0\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5b9e\u9a8c \u76f4\u63a5\u5728\u9a71\u52a8\u4ee3\u7801\u4e2d\u786c\u7f16\u7801\u786c\u4ef6\u8d44\u6e90&#xff08;\u5982\u5bc4\u5b58\u5668\u5730\u5740\u3001GPIO\u5f15\u811a\u53f7&#xff09;&#xff0c;\u901a\u8fc7ioremap\u624b\u52a8\u6620\u5c04\u5bc4\u5b58\u5668\u5e76\u64cd\u4f5c\u3002\u4f8b\u5982&#xff1a;<\/p>\n<p> <span class=\"token keyword\">void<\/span> __iomem <span class=\"token operator\">*<\/span>GPIO1_DR <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ioremap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0x0209C000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0x04<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u76f4\u63a5\u5199\u6b7b\u5bc4\u5b58\u5668\u5730\u5740<\/span><\/p>\n<p>\u7f3a\u70b9&#xff1a;\u4ee3\u7801\u4e0e\u786c\u4ef6\u7ed1\u5b9a&#xff0c;\u79fb\u690d\u6027\u5dee&#xff0c;\u9700\u91cd\u65b0\u7f16\u8bd1\u9a71\u52a8\u624d\u80fd\u9002\u914d\u4e0d\u540c\u677f\u5361\u3002<\/p>\n<\/li>\n<li>\n<p>\u8bbe\u5907\u6811\u4e0b\u7684LED\u5b9e\u9a8c \u901a\u8fc7\u8bbe\u5907\u6811&#xff08;DTS&#xff09;\u52a8\u6001\u63cf\u8ff0\u786c\u4ef6\u8d44\u6e90&#xff08;\u5982\u5bc4\u5b58\u5668\u5730\u5740\u3001GPIO\u7ec4\u548c\u5f15\u811a&#xff09;&#xff0c;\u9a71\u52a8\u901a\u8fc7OF\u51fd\u6570&#xff08;\u5982of_iomap&#xff09;\u4ece\u8bbe\u5907\u6811\u4e2d\u83b7\u53d6\u8d44\u6e90\u3002\u4f8b\u5982&#xff1a;<\/p>\n<p> alphaled {<br \/>\n    reg &#061; &lt;0x0209C000 0x04&gt;; \/\/ \u5bc4\u5b58\u5668\u5730\u5740\u548c\u957f\u5ea6<br \/>\n};<\/p>\n<p>\u4f18\u70b9&#xff1a;\u786c\u4ef6\u914d\u7f6e\u4e0e\u9a71\u52a8\u5206\u79bb&#xff0c;\u66f4\u6362\u677f\u5361\u65f6\u4ec5\u9700\u4fee\u6539\u8bbe\u5907\u6811&#xff0c;\u65e0\u9700\u91cd\u65b0\u7f16\u8bd1\u9a71\u52a8\u3002<\/p>\n<\/li>\n<li>\n<p>GPIO\u5b50\u7cfb\u7edf\u7684LED\u5b9e\u9a8c \u4f9d\u8d56GPIO\u5b50\u7cfb\u7edf\u548cPinctrl\u5b50\u7cfb\u7edf\u3002\u8bbe\u5907\u6811\u4e2d\u5b9a\u4e49GPIO\u5f15\u811a\u548c\u7535\u6c14\u5c5e\u6027&#xff0c;\u9a71\u52a8\u901a\u8fc7gpiod_get\u7b49API\u64cd\u4f5cGPIO\u3002\u4f8b\u5982&#xff1a;<\/p>\n<p> leds {<br \/>\n    compatible &#061; &#034;gpio-leds&#034;;<br \/>\n    led1 {<br \/>\n        gpios &#061; &lt;&amp;gpio1 3 GPIO_ACTIVE_LOW&gt;; \/\/ \u4f7f\u7528GPIO\u5b50\u7cfb\u7edf<br \/>\n    };<br \/>\n};<\/p>\n<p>\u4f18\u70b9&#xff1a;\u5b8c\u5168\u9075\u5faaLinux\u9a71\u52a8\u5206\u5c42\u601d\u60f3&#xff0c;\u65e0\u9700\u76f4\u63a5\u64cd\u4f5c\u5bc4\u5b58\u5668&#xff0c;\u4ee3\u7801\u6700\u7b80\u6d01\u3002<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h4>2. \u9a71\u52a8\u67b6\u6784\u590d\u6742\u5ea6<\/h4>\n<ul>\n<li>\n<p>\u65b0\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8<\/p>\n<ul>\n<li>\u9700\u624b\u52a8\u5b9e\u73b0file_operations\u7ed3\u6784\u4f53&#xff08;\u5982open\u3001write&#xff09;\u3002<\/li>\n<li>\u9700\u5904\u7406\u8bbe\u5907\u53f7\u7533\u8bf7\u3001cdev\u6ce8\u518c\u7b49\u5e95\u5c42\u64cd\u4f5c\u3002<\/li>\n<li>\u5178\u578b\u6d41\u7a0b&#xff1a;register_chrdev \u2192 ioremap \u2192 \u64cd\u4f5c\u5bc4\u5b58\u5668\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8bbe\u5907\u6811\u4e0b\u9a71\u52a8<\/p>\n<ul>\n<li>\u4ecd\u57fa\u4e8e\u5b57\u7b26\u8bbe\u5907\u6846\u67b6&#xff0c;\u4f46\u901a\u8fc7\u8bbe\u5907\u6811\u4f20\u9012\u786c\u4ef6\u53c2\u6570\u3002<\/li>\n<li>\u9700\u4f7f\u7528OF\u51fd\u6570&#xff08;\u5982of_property_read_u32_array&#xff09;\u89e3\u6790\u8bbe\u5907\u6811\u3002<\/li>\n<li>\u5178\u578b\u6d41\u7a0b&#xff1a;\u89e3\u6790\u8bbe\u5907\u6811 \u2192 \u8d44\u6e90\u6620\u5c04 \u2192 \u6ce8\u518c\u5b57\u7b26\u8bbe\u5907\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>GPIO\u5b50\u7cfb\u7edf\u9a71\u52a8<\/p>\n<ul>\n<li>\u76f4\u63a5\u8c03\u7528GPIO\u5b50\u7cfb\u7edfAPI&#xff08;\u5982gpiod_set_value&#xff09;\u3002<\/li>\n<li>\u65e0\u9700\u5173\u5fc3\u5bc4\u5b58\u5668\u6620\u5c04&#xff0c;Pinctrl\u5b50\u7cfb\u7edf\u81ea\u52a8\u914d\u7f6e\u5f15\u811a\u590d\u7528\u548c\u7535\u6c14\u5c5e\u6027\u3002<\/li>\n<li>\u5178\u578b\u6d41\u7a0b&#xff1a;\u8bbe\u5907\u6811\u5b9a\u4e49GPIO \u2192 \u9a71\u52a8\u8c03\u7528gpiod_get \u2192 \u63a7\u5236LED\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h4>3. \u4ee3\u7801\u590d\u7528\u6027\u4e0e\u79fb\u690d\u6027<\/h4>\n<table>\n<tr>\u65b9\u5f0f\u79fb\u690d\u6027\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>\u65b0\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8<\/td>\n<td>\u5dee&#xff08;\u9700\u4fee\u6539\u4ee3\u7801&#xff09;<\/td>\n<td>\u5b66\u4e60\u5e95\u5c42\u5bc4\u5b58\u5668\u64cd\u4f5c<\/td>\n<\/tr>\n<tr>\n<td>\u8bbe\u5907\u6811\u4e0b\u9a71\u52a8<\/td>\n<td>\u4e2d&#xff08;\u4fee\u6539\u8bbe\u5907\u6811\u5373\u53ef&#xff09;<\/td>\n<td>\u9700\u7075\u6d3b\u914d\u7f6e\u786c\u4ef6\u7684\u9879\u76ee<\/td>\n<\/tr>\n<tr>\n<td>GPIO\u5b50\u7cfb\u7edf\u9a71\u52a8<\/td>\n<td>\u4f18&#xff08;\u6807\u51c6\u5316API&#xff0c;\u8de8\u5e73\u53f0&#xff09;<\/td>\n<td>\u5feb\u901f\u5f00\u53d1\u3001\u4e3b\u6d41Linux\u5185\u6838\u652f\u6301<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u793a\u4f8b\u5bf9\u6bd4&#xff1a;<\/p>\n<ul>\n<li>\u540c\u4e00\u9a71\u52a8\u5728STM32MP157\u548ci.MX6ULL\u4e0a\u79fb\u690d&#xff1a;\n<ul>\n<li>\u65b0\u5b57\u7b26\u9a71\u52a8\u9700\u91cd\u5199\u5bc4\u5b58\u5668\u5730\u5740\u3002<\/li>\n<li>\u8bbe\u5907\u6811\u9a71\u52a8\u4ec5\u9700\u8c03\u6574.dts\u4e2d\u7684reg\u5c5e\u6027\u3002<\/li>\n<li>GPIO\u9a71\u52a8\u65e0\u9700\u4fee\u6539\u4ee3\u7801&#xff0c;\u53ea\u9700\u8c03\u6574\u8bbe\u5907\u6811\u7684gpios\u5c5e\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h4>4. \u5f00\u53d1\u6548\u7387\u4e0e\u7ef4\u62a4\u6210\u672c<\/h4>\n<ul>\n<li>\n<p>GPIO\u5b50\u7cfb\u7edf\u9a71\u52a8\u6548\u7387\u6700\u9ad8&#xff1a;<\/p>\n<ul>\n<li>\u5185\u6838\u5df2\u63d0\u4f9bleds-gpio.c\u7b49\u6846\u67b6&#xff0c;\u652f\u6301\u81ea\u52a8\u521b\u5efa\u8bbe\u5907\u8282\u70b9\u548cTrigger\u529f\u80fd&#xff08;\u5982\u5fc3\u8df3\u706f\u3001\u5b9a\u65f6\u95ea\u70c1&#xff09;\u3002<\/li>\n<li>\u8bbe\u5907\u6811\u4e2d\u53ef\u5b9a\u4e49\u9ed8\u8ba4\u72b6\u6001\u548cTrigger&#xff1a;linux,default-trigger &#061; &#034;heartbeat&#034;; \/\/ \u5fc3\u8df3\u6548\u679c<br \/>\ndefault-state &#061; &#034;on&#034;;               \/\/ \u9ed8\u8ba4\u70b9\u4eae\n <\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u65b0\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u7ef4\u62a4\u6210\u672c\u9ad8&#xff1a; \u4efb\u4f55\u786c\u4ef6\u53d8\u66f4\u90fd\u9700\u91cd\u65b0\u7f16\u8bd1\u9a71\u52a8&#xff0c;\u4e14\u6613\u51fa\u73b0\u5f15\u811a\u51b2\u7a81&#xff08;\u5982I2C\u548cUART\u590d\u7528\u540c\u4e00\u5f15\u811a\u672a\u68c0\u6d4b&#xff09;\u3002<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h4>5. \u9009\u62e9\u5efa\u8bae<\/h4>\n<li>\u5b66\u4e60\u9636\u6bb5&#xff1a;\u4ece\u65b0\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5f00\u59cb&#xff0c;\u7406\u89e3\u5e95\u5c42\u786c\u4ef6\u64cd\u4f5c&#xff08;\u5982\u5bc4\u5b58\u5668\u914d\u7f6e&#xff09;\u3002<\/li>\n<li>\u5b9e\u9645\u9879\u76ee&#xff1a;\u4f18\u5148\u4f7f\u7528GPIO\u5b50\u7cfb\u7edf&#xff0c;\u5feb\u901f\u5b9e\u73b0\u529f\u80fd\u5e76\u51cf\u5c11\u786c\u4ef6\u4f9d\u8d56\u3002<\/li>\n<li>\u590d\u6742\u786c\u4ef6&#xff1a;\u82e5\u9700\u7cbe\u7ec6\u63a7\u5236\u5bc4\u5b58\u5668&#xff08;\u5982\u65f6\u949f\u914d\u7f6e&#xff09;&#xff0c;\u9009\u62e9\u8bbe\u5907\u6811\u4e0b\u9a71\u52a8\u3002<\/li>\n<hr \/>\n<h4>\u603b\u7ed3\u5bf9\u6bd4\u8868<\/h4>\n<table>\n<tr>\u7ef4\u5ea6\u65b0\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u8bbe\u5907\u6811\u4e0b\u9a71\u52a8GPIO\u5b50\u7cfb\u7edf\u9a71\u52a8<\/tr>\n<tbody>\n<tr>\n<td>\u786c\u4ef6\u7ed1\u5b9a<\/td>\n<td>\u5f3a&#xff08;\u4ee3\u7801\u5199\u6b7b&#xff09;<\/td>\n<td>\u4e2d&#xff08;\u8bbe\u5907\u6811\u63cf\u8ff0&#xff09;<\/td>\n<td>\u5f31&#xff08;\u6807\u51c6\u5316API&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u5f00\u53d1\u590d\u6742\u5ea6<\/td>\n<td>\u9ad8&#xff08;\u9700\u64cd\u4f5c\u5bc4\u5b58\u5668&#xff09;<\/td>\n<td>\u4e2d&#xff08;\u9700\u89e3\u6790\u8bbe\u5907\u6811&#xff09;<\/td>\n<td>\u4f4e&#xff08;\u76f4\u63a5\u8c03\u7528GPIO\u51fd\u6570&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u79fb\u690d\u6027<\/td>\n<td>\u5dee<\/td>\n<td>\u826f<\/td>\n<td>\u4f18<\/td>\n<\/tr>\n<tr>\n<td>\u9002\u7528\u573a\u666f<\/td>\n<td>\u6559\u5b66\u3001\u5e95\u5c42\u7814\u7a76<\/td>\n<td>\u81ea\u5b9a\u4e49\u786c\u4ef6\u914d\u7f6e<\/td>\n<td>\u91cf\u4ea7\u3001\u5feb\u901f\u5f00\u53d1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u901a\u8fc7\u4e0a\u8ff0\u5bf9\u6bd4&#xff0c;\u53ef\u6839\u636e\u9879\u76ee\u9700\u6c42\u9009\u62e9\u5408\u9002\u65b9\u6848\u3002GPIO\u5b50\u7cfb\u7edf\u662fLinux\u63a8\u8350\u7684\u6700\u4f73\u5b9e\u8df5&#xff0c;\u800c\u8bbe\u5907\u6811\u9a71\u52a8\u9002\u5408\u9700\u8981\u6df1\u5ea6\u5b9a\u5236\u786c\u4ef6\u7684\u573a\u666f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb449\u6b21\uff0c\u70b9\u8d5e8\u6b21\uff0c\u6536\u85cf5\u6b21\u3002\u7ef4\u5ea6\u65b0\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u8bbe\u5907\u6811\u4e0b\u9a71\u52a8GPIO\u5b50\u7cfb\u7edf\u9a71\u52a8\u786c\u4ef6\u7ed1\u5b9a\u5f3a\uff08\u4ee3\u7801\u5199\u6b7b\uff09\u4e2d\uff08\u8bbe\u5907\u6811\u63cf\u8ff0\uff09\u5f31\uff08\u6807\u51c6\u5316API\uff09\u5f00\u53d1\u590d\u6742\u5ea6\u9ad8\uff08\u9700\u64cd\u4f5c\u5bc4\u5b58\u5668\uff09\u4e2d\uff08\u9700\u89e3\u6790\u8bbe\u5907\u6811\uff09\u4f4e\uff08\u76f4\u63a5\u8c03\u7528GPIO\u51fd\u6570\uff09\u79fb\u690d\u6027\u5dee\u826f\u4f18\u9002\u7528\u573a\u666f\u6559\u5b66\u3001\u5e95\u5c42\u7814\u7a76\u81ea\u5b9a\u4e49\u786c\u4ef6\u914d\u7f6e\u91cf\u4ea7\u3001\u5feb\u901f\u5f00\u53d1\u901a\u8fc7\u4e0a\u8ff0\u5bf9\u6bd4\uff0c\u53ef\u6839\u636e\u9879\u76ee\u9700\u6c42\u9009\u62e9\u5408\u9002\u65b9\u6848\u3002GPIO\u5b50\u7cfb\u7edf\u662fLinux\u63a8\u8350\u7684\u6700\u4f73\u5b9e\u8df5\uff0c\u800c\u8bbe\u5907\u6811\u9a71\u52a8\u9002\u5408\u9700\u8981\u6df1\u5ea6\u5b9a\u5236\u786c\u4ef6\u7684\u573a\u666f\u3002<\/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":[58,2684,44,1363],"topic":[],"class_list":{"0":"post-32967","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-server","7":"tag-linux","9":"tag-44","10":"tag-1363"},"yoast_head":"<!-- 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