{"id":62009,"date":"2025-04-29T10:57:28","date_gmt":"2025-04-29T02:57:28","guid":{"rendered":"https:\/\/fwq.ai\/blog\/62009\/"},"modified":"2025-04-29T10:57:28","modified_gmt":"2025-04-29T02:57:28","slug":"%e4%b8%8d%e6%95%b2%e4%b8%80%e8%a1%8c%e4%bb%a3%e7%a0%81%ef%bc%8c%e5%ae%9e%e7%8e%b0linux%e4%b8%8b%e7%9a%84led%e9%a9%b1%e5%8a%a8%ef%bc%81-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/62009\/","title":{"rendered":"\u4e0d\u6572\u4e00\u884c\u4ee3\u7801\uff0c\u5b9e\u73b0Linux\u4e0b\u7684LED\u9a71\u52a8\uff01"},"content":{"rendered":"<h2> <span><\/span><span style=\"padding: 2px 10px 1px;border-top-right-radius: 3px;border-top-left-radius: 3px;margin-right: 3px\">\u524d\u8a00<\/span><span style=\"vertical-align: bottom;border-bottom: 36px solid #efebe9;border-right: 20px solid transparent\"> <\/span> <\/h2>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u5982\u679c\u8981\u5b9e\u73b0\u4e00\u4e2a\u8bbe\u5907\u7684\u9a71\u52a8\uff0c\u4e00\u884c\u9a71\u52a8\u4ee3\u7801\u90fd\u4e0d\u7528\u5199\uff0c\u8fd9\u542c\u8d77\u6765\u662f\u4e0d\u662f\u5929\u65b9\u591c\u8c2d\u5462\uff1f<\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\"><strong>\u4f46\u8fd9\u5e76\u4e0d\u662f\u4e0d\u53ef\u5b9e\u73b0\u7684\uff0c\u56e0\u4e3a\u5168\u4e16\u754c\u7684\u5185\u6838\u5f00\u53d1\u8005\u90fd\u975e\u5e38\u70ed\u5fc3\uff0c\u53ea\u8981\u662f\u80fd\u5199\u7684\u9a71\u52a8\uff0c\u4ed6\u4eec\u57fa\u672c\u90fd\u5df2\u7ecf\u5199\u4e86\u3002<\/strong><\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u4eca\u5929\uff0c\u6211\u4eec\u5c31\u7ad9\u5728\u5de8\u4eba\u7684\u80a9\u8180\u4e0a\uff0c\u5229\u7528\u5185\u6838\u5f00\u53d1\u8005\u5df2\u7ecf\u5199\u597d\u7684\u9a71\u52a8\u6765\u5b9e\u73b0\u6211\u4eec\u60f3\u8981\u7684\u529f\u80fd\uff0c\u672c\u7bc7\u8ba8\u8bba\u7684\u662fLED\u9a71\u52a8\u3002<\/p>\n<h2> <span><\/span><span style=\"padding: 2px 10px 1px;border-top-right-radius: 3px;border-top-left-radius: 3px;margin-right: 3px\">LED\u9a71\u52a8<\/span><span style=\"vertical-align: bottom;border-bottom: 36px solid #efebe9;border-right: 20px solid transparent\"> <\/span> <\/h2>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u6211\u4eec\u4ee5imx6ull pro\u5f00\u53d1\u677f\u7684\u677f\u8f7dled\u4e3a\u4f8b\uff0c\u5176\u677f\u8f7d\u4e86\u4e00\u4e2a\u53ef\u63a7\u5236\u7684Led2\uff0c\u539f\u7406\u56fe\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/275\/014\/4273c46fe81bea65814fbece8c3741cc-0.png\" class=\"aligncenter\" title=\"\u4e0d\u6572\u4e00\u884c\u4ee3\u7801\uff0c\u5b9e\u73b0Linux\u4e0b\u7684LED\u9a71\u52a8\uff01\u63d2\u56fe\" alt=\"\u4e0d\u6572\u4e00\u884c\u4ee3\u7801\uff0c\u5b9e\u73b0Linux\u4e0b\u7684LED\u9a71\u52a8\uff01\u63d2\u56fe\" \/>  <\/p>\n<p style=\"max-width:90%\">LED2\u8fdb\u884c\u4e0a\u62c9\u7535\u963b\uff0c\u53e6\u5916\u4e00\u4e2a\u7ba1\u811a\u63a5\u5230\u4e86GPIO5_3\uff0c\u56e0\u6b64GPIO5_3\u8f93\u51fa\u4f4e\u7535\u5e73\u5373\u53ef\u70b9\u4eaeLED\u3002\u4e0b\u9762\u8bf4\u660e\u5982\u4f55\u63a7\u5236\u8be5LED\u3002<\/p>\n<h3> <span><\/span>\u5185\u6838\u914d\u7f6e\uff1a<span><\/span> <\/h3>\n<pre>&nbsp;Device&nbsp;Drivers&nbsp;&nbsp;---&amp;gt;\n&nbsp;&nbsp;[*]&nbsp;LED&nbsp;Support&nbsp;&nbsp;---&amp;gt;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LED&nbsp;Class&nbsp;Support\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LED&nbsp;Support&nbsp;for&nbsp;GPIO&nbsp;connected&nbsp;LEDs\n&nbsp;&nbsp;&nbsp;[*]&nbsp;&nbsp;&nbsp;LED&nbsp;Trigger&nbsp;support&nbsp;&nbsp;---&amp;gt;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u6211\u4eec\u7684LED\u9a71\u52a8\u662f\u57fa\u4e8eGPIO\u7684\uff0c\u56e0\u6b64\u9700\u8981\u6253\u5f00\u5185\u6838LED\u9a71\u52a8\u7684\u652f\u6301\u3002<\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u5185\u6838\u6709\u4e24\u4e2a\u5bf9\u5e94\u7684\u9a71\u52a8\u7a0b\u5e8f\uff0c\u5206\u522b\u662f<strong>GPIO\u9a71\u52a8<\/strong>\u548c<strong>LED\u9a71\u52a8<\/strong>\uff0c<strong>\u57fa\u4e8eGPIO\u7684LED\u9a71\u52a8\u8c03\u7528\u4e86GPIO\u9a71\u52a8\u5bfc\u51fa\u7684\u51fd\u6570<\/strong>\u3002<\/p>\n<blockquote style=\"border-top: none;border-right: none;border-bottom: none;font-size: 0.9em;overflow: auto;padding: 10px 10px 10px 20px;margin-bottom: 20px;margin-top: 20px\">\n<p style=\"font-size: 16px;padding-top: 8px;padding-bottom: 8px;color: black;line-height: 26px\">LED\u9a71\u52a8\u5b9e\u73b0\u4ee3\u7801\u8bf7\u53c2\u8003\uff1adrivers\/leds\/leds-gpio.c\uff0c\u5b83\u5b9e\u73b0\u4e86\u4e00\u4e2aleds\u7c7b\uff0c\u901a\u8fc7sysfs\u63a5\u53e3\u5bf9LED\u8fdb\u884c\u63a7\u5236\u3002<\/p>\n<\/blockquote>\n<h3> <span><\/span>\u8bbe\u5907\u6811\uff1a<span><\/span> <\/h3>\n<pre>leds{\n&nbsp;compatible&nbsp;=&nbsp;\"gpio-leds\";\n&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;led2{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;label&nbsp;=&nbsp;\"led2\";\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;gpios&nbsp;=&nbsp;;\/\/GPIO_ACTIVE_LOW\uff0c\u4ee3\u8868\u4f4e\u7535\u5e73\u70b9\u4eaeLED\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;default-state&nbsp;=&nbsp;\"on\";\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};\n}<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u5728\u8bbe\u5907\u6811\u4e2d\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aleds\u7684\u8282\u70b9\uff0ccompatible\u4e3a&#8221;gpio-leds&#8221;\uff0c\u8fd9\u6837\u53ef\u4ee5\u5339\u914d\u5230leds-gpio.c\u7684\u9a71\u52a8\u3002<\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u7136\u540e\u521b\u5efa\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u540d\u4e3aled2\u3002\u9700\u8981\u586b\u4e09\u4e2a\u5c5e\u6027\uff1alabel\u3001gpios\u548cdefault-state\u3002<\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\"><strong>label<\/strong>\uff1alable\u662f\u51fa\u73b0\u5728sys\u76ee\u5f55\u4e0b\u7684\u540d\u5b57\uff0c\u5373\u751f\u6210\/sys\/class\/leds\/led2<\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\"><strong>gpios<\/strong>\uff1a\u524d\u4e24\u4e2a\u503c\u6307\u5b9a\u4e86\u8be5LED\u6240\u8fde\u63a5\u7684GPIO\u3002\u7b2c\u4e09\u4e2a\u503c\u53ef\u586bGPIO_ACTIVE_HIGH\u6216GPIO_ACTIVE_LOW\u3002GPIO_ACTIVE_HIGH\u4ee3\u8868\u9ad8\u7535\u5e73\u70b9\u4eaeLED\uff0cGPIO_ACTIVE_LOW\u4ee3\u8868\u4f4e\u7535\u5e73\u70b9\u4eaeLED\u3002<\/p>\n<blockquote style=\"border-top: none;border-right: none;border-bottom: none;font-size: 0.9em;overflow: auto;padding: 10px 10px 10px 20px;margin-bottom: 20px;margin-top: 20px\">\n<p style=\"font-size: 16px;padding-top: 8px;padding-bottom: 8px;color: black;line-height: 26px\">\u8fd9\u91cc\u6ce8\u610f\u4e86\uff0cgpios\u5c5e\u6027\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\uff0c\u4ee3\u8868\u8be5gpio\u70b9\u4eaeLED\u662f\u9700\u8981\u9ad8\u7535\u5e73\u8fd8\u662f\u4f4e\u7535\u5e73\uff0c\u6ce8\u610f\u662f\u70b9\u4eaeLED\uff0c\u7ec6\u54c1<\/p>\n<\/blockquote>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\"><strong>default-state<\/strong>\uff1aon\u4ee3\u8868\u9ed8\u8ba4\u60c5\u51b5LED\u662f\u70b9\u4eae\u7684\uff0coff\u4ee3\u8868\u9ed8\u8ba4LED\u7184\u706d<\/p>\n<blockquote style=\"border-top: none;border-right: none;border-bottom: none;font-size: 0.9em;overflow: auto;padding: 10px 10px 10px 20px;margin-bottom: 20px;margin-top: 20px\">\n<p style=\"font-size: 16px;padding-top: 8px;padding-bottom: 8px;color: black;line-height: 26px\">\u8fd9\u91cc\u53c8\u6ce8\u610f\u4e86\uff0c\u5f53defalut-state\u4e3aon\u65f6\uff0c\u5b9e\u9645\u4e0agpio\u8f93\u51fa\u7684\u7535\u5e73\uff0c\u5c31\u662fgpios\u5c5e\u6027\u4e2d\u6307\u5b9a\u7684\u70b9\u4eaeLED\u65f6\u7684\u7535\u5e73<\/p>\n<\/blockquote>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u8bbe\u5907\u6811\u914d\u7f6e\u597d\u540e\uff0c\u7f16\u8bd1\u5e76\u66f4\u6362dtb\uff0c\u7136\u540e\u91cd\u542f\u5f00\u53d1\u677f\u3002\u53ef\u4ee5\u770b\u5230\/sys\/class\/leds\/led2\u76ee\u5f55\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/275\/014\/4273c46fe81bea65814fbece8c3741cc-1.png\" class=\"aligncenter\" title=\"\u4e0d\u6572\u4e00\u884c\u4ee3\u7801\uff0c\u5b9e\u73b0Linux\u4e0b\u7684LED\u9a71\u52a8\uff01\u63d2\u56fe1\" alt=\"\u4e0d\u6572\u4e00\u884c\u4ee3\u7801\uff0c\u5b9e\u73b0Linux\u4e0b\u7684LED\u9a71\u52a8\uff01\u63d2\u56fe1\" \/>  <\/p>\n<p style=\"max-width:90%\">\/sys\/class\/leds\/led2\/\u76ee\u5f55\u4e0b\u6709\u4e00\u4e2abrightnes\u6587\u4ef6\uff0c\u53ef\u4ee5\u901a\u8fc7echo cat\u7684\u65b9\u5f0f\u67e5\u770b\u548c\u4fee\u6539LED\u7684\u4eae\u5ea6\u3002\u56e0\u4e3aLED\u8fde\u63a5\u5728GPIO\u4e0a\uff0c\u6240\u4ee5\u4eae\u5ea6\u53ea\u67090\u548c1\uff0c\u5728\u672c\u6587\u793a\u4f8b\u7684led2\u4e2d\uff0c0\u8868\u793a\u70b9\u4eae\uff0c1\u8868\u793a\u7184\u706d\u3002<\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u70b9\u4eaeLED\uff1a<\/p>\n<pre>echo&nbsp;0&nbsp;&amp;gt;&nbsp;\/sys\/class\/leds\/led2\/brightness<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u7184\u706dLED\uff1a<\/p>\n<pre>echo&nbsp;1&nbsp;&amp;gt;&nbsp;\/sys\/class\/leds\/led2\/brightness<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<h2> <span><\/span><span style=\"padding: 2px 10px 1px;border-top-right-radius: 3px;border-top-left-radius: 3px;margin-right: 3px\">\u5e94\u7528\u5c42\u63a7\u5236<\/span><span style=\"vertical-align: bottom;border-bottom: 36px solid #efebe9;border-right: 20px solid transparent\"> <\/span> <\/h2>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u9664\u4e86\u53ef\u4ee5\u5728shell\u4e2d\u901a\u8fc7echo\u3001cat\u7684\u65b9\u5f0f\u63a7\u5236Led\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728\u5199\u4e00\u4e2a\u5e94\u7528\u5c42\u7a0b\u5e8f\u6765\u64cd\u4f5c\/sys\/class\/leds\/\u4e0b\u7684\u8282\u70b9\uff0c\u5e94\u7528\u5c42\u4ee3\u7801\uff1a<\/p>\n<pre>#include&nbsp;&lt;stdio.h&gt;\n#include&nbsp;&lt;stdlib.h&gt;\n#include&nbsp;&lt;unistd.h&gt;\n#include&nbsp;&lt;errno.h&gt;\n#include&nbsp;&lt;fcntl.h&gt;\n#include&nbsp;&lt;string.h&gt;\n\n#include&nbsp;&lt;sys&gt;\n#include&nbsp;&lt;sys&gt;\n\n#define&nbsp;LED_DEV_PATH&nbsp;\"\/sys\/class\/leds\/led%d\/brightness\"\n#define&nbsp;ON\n#define&nbsp;OFF\n\nint&nbsp;fs4412_set_led(unsigned&nbsp;int&nbsp;lednum,&nbsp;unsigned&nbsp;int&nbsp;mode)\n{\n&nbsp;int&nbsp;fd;\n&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;ret;\n&nbsp;&nbsp;&nbsp;&nbsp;char&nbsp;devpath[128];\n&nbsp;&nbsp;&nbsp;&nbsp;char&nbsp;*on&nbsp;=&nbsp;\"1\n\";\n&nbsp;&nbsp;&nbsp;&nbsp;char&nbsp;*off&nbsp;=&nbsp;\"0\n\";\n&nbsp;&nbsp;&nbsp;&nbsp;char&nbsp;*m&nbsp;=&nbsp;NULL;\n&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;snprintf(devpath,&nbsp;sizeof(devpath),&nbsp;LED_DEV_PATH,&nbsp;lednum);\n&nbsp;&nbsp;&nbsp;&nbsp;fd&nbsp;=&nbsp;open(devpath,&nbsp;O_WRONLY);\n&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(fd&nbsp;==&nbsp;-1)&nbsp;{\n&nbsp;&nbsp;perror(\"fsled-&amp;gt;open\");\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;-1;\n&nbsp;}\n&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(mode&nbsp;==&nbsp;ON)\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m&nbsp;=&nbsp;on;\n&nbsp;&nbsp;&nbsp;&nbsp;else\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m&nbsp;=&nbsp;off;\n&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;ret&nbsp;=&nbsp;write(fd,&nbsp;m,&nbsp;strlen(m));\n&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(ret&nbsp;==&nbsp;-1)&nbsp;{\n&nbsp;&nbsp;perror(\"fsled-&amp;gt;wrtie\");\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;close(fd);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;-1;\n&nbsp;&nbsp;&nbsp;&nbsp;}\n&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;close(fd);\n&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;0;\n\n}\n\nint&nbsp;main(int&nbsp;argc,&nbsp;char&nbsp;*argv[])\n{\n&nbsp;unsigned&nbsp;int&nbsp;lednum&nbsp;=&nbsp;2;\n&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;while(1){\n&nbsp;&nbsp;fs4412_set_led(lednum,&nbsp;on);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;usleep(500000);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fs4412_set_led(lednum,&nbsp;OFF);\n&nbsp;&nbsp;usleep(500000);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lednum++;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(lednum&nbsp;&amp;gt;&nbsp;5)\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lednum&nbsp;=&nbsp;2;\n&nbsp;}\n\n&nbsp;return&nbsp;0;\n}&lt;\/sys&gt;&lt;\/sys&gt;&lt;\/string.h&gt;&lt;\/fcntl.h&gt;&lt;\/errno.h&gt;&lt;\/unistd.h&gt;&lt;\/stdlib.h&gt;&lt;\/stdio.h&gt;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u4e0a\u8ff0\u5e94\u7528\u5c42\u4ee3\u7801\u6267\u884c\u540e\uff0cled2\u4f1a\u95ea\u70c1\u3002<\/p>\n<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u4e0d\u6572\u4e00\u884c\u4ee3\u7801\uff0c\u5b9e\u73b0Linux\u4e0b\u7684LED\u9a71\u52a8\uff01\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8FDCServers\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u5982\u679c\u8981\u5b9e\u73b0\u4e00\u4e2a\u8bbe\u5907\u7684\u9a71\u52a8\uff0c\u4e00\u884c\u9a71\u52a8\u4ee3\u7801\u90fd\u4e0d\u7528\u5199\uff0c\u8fd9\u542c\u8d77\u6765\u662f\u4e0d\u662f\u5929\u65b9\u591c\u8c2d\u5462\uff1f \u4f46\u8fd9\u5e76\u4e0d\u662f\u4e0d\u53ef\u5b9e\u73b0\u7684\uff0c\u56e0\u4e3a\u5168\u4e16\u754c\u7684\u5185\u6838\u5f00\u53d1\u8005\u90fd\u975e\u5e38\u70ed\u5fc3\uff0c\u53ea\u8981\u662f\u80fd\u5199\u7684\u9a71\u52a8\uff0c\u4ed6\u4eec\u57fa\u672c\u90fd\u5df2\u7ecf\u5199\u4e86\u3002 \u4eca\u5929\uff0c\u6211\u4eec\u5c31\u7ad9\u5728\u5de8\u4eba\u7684\u80a9\u8180\u4e0a\uff0c\u5229\u7528\u5185\u6838\u5f00\u53d1\u8005\u5df2\u7ecf\u5199\u597d\u7684\u9a71\u52a8\u6765\u5b9e\u73b0\u6211\u4eec\u60f3\u8981\u7684\u529f\u80fd\uff0c\u672c\u7bc7\u8ba8\u8bba\u7684\u662fLED\u9a71\u52a8\u3002 LED\u9a71\u52a8 \u6211\u4eec\u4ee5imx6ull pro\u5f00\u53d1\u677f\u7684\u677f\u8f7dled\u4e3a\u4f8b\uff0c\u5176\u677f\u8f7d\u4e86\u4e00\u4e2a\u53ef\u63a7\u5236\u7684Led2\uff0c\u539f\u7406\u56fe\u5982\u4e0b\uff1a LED2\u8fdb\u884c\u4e0a\u62c9\u7535\u963b\uff0c\u53e6\u5916\u4e00\u4e2a\u7ba1\u811a\u63a5\u5230\u4e86GPIO5_3\uff0c\u56e0\u6b64GPIO5_3\u8f93\u51fa\u4f4e\u7535\u5e73\u5373\u53ef\u70b9\u4eaeLED\u3002\u4e0b\u9762\u8bf4\u660e\u5982\u4f55\u63a7\u5236\u8be5LED\u3002 \u5185\u6838\u914d\u7f6e\uff1a &nbsp;Device&nbsp;Drivers&nbsp;&nbsp;&#8212;&amp;gt; &nbsp;&nbsp;[*]&nbsp;LED&nbsp;Support&nbsp;&nbsp;&#8212;&amp;gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LED&nbsp;Class&nbsp;Support &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LED&nbsp;Support&nbsp;for&nbsp;GPIO&nbsp;connected&nbsp;LEDs &nbsp;&nbsp;&nbsp;[*]&nbsp;&nbsp;&nbsp;LED&nbsp;Trigger&nbsp;support&nbsp;&nbsp;&#8212;&amp;gt; \u767b\u5f55\u540e\u590d\u5236 \u6211\u4eec\u7684LED\u9a71\u52a8\u662f\u57fa\u4e8eGPIO\u7684\uff0c\u56e0\u6b64\u9700\u8981\u6253\u5f00\u5185\u6838LED\u9a71\u52a8\u7684\u652f\u6301\u3002 \u5185\u6838\u6709\u4e24\u4e2a\u5bf9\u5e94\u7684\u9a71\u52a8\u7a0b\u5e8f\uff0c\u5206\u522b\u662fGPIO\u9a71\u52a8\u548cLED\u9a71\u52a8\uff0c\u57fa\u4e8eGPIO\u7684LED\u9a71\u52a8\u8c03\u7528\u4e86GPIO\u9a71\u52a8\u5bfc\u51fa\u7684\u51fd\u6570\u3002 LED\u9a71\u52a8\u5b9e\u73b0\u4ee3\u7801\u8bf7\u53c2\u8003\uff1adrivers\/leds\/leds-gpio.c\uff0c\u5b83\u5b9e\u73b0\u4e86\u4e00\u4e2aleds\u7c7b\uff0c\u901a\u8fc7sysfs\u63a5\u53e3\u5bf9LED\u8fdb\u884c\u63a7\u5236\u3002 \u8bbe\u5907\u6811\uff1a leds{ &nbsp;compatible&nbsp;=&nbsp;&#8220;gpio-leds&#8221;; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;led2{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;label&nbsp;=&nbsp;&#8220;led2&#8221;; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;gpios&nbsp;=&nbsp;;\/\/GPIO_ACTIVE_LOW\uff0c\u4ee3\u8868\u4f4e\u7535\u5e73\u70b9\u4eaeLED &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;default-state&nbsp;=&nbsp;&#8220;on&#8221;; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}; } \u767b\u5f55\u540e\u590d\u5236 \u5728\u8bbe\u5907\u6811\u4e2d\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aleds\u7684\u8282\u70b9\uff0ccompatible\u4e3a&#8221;gpio-leds&#8221;\uff0c\u8fd9\u6837\u53ef\u4ee5\u5339\u914d\u5230leds-gpio.c\u7684\u9a71\u52a8\u3002 \u7136\u540e\u521b\u5efa\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u540d\u4e3aled2\u3002\u9700\u8981\u586b\u4e09\u4e2a\u5c5e\u6027\uff1alabel\u3001gpios\u548cdefault-state\u3002 label\uff1alable\u662f\u51fa\u73b0\u5728sys\u76ee\u5f55\u4e0b\u7684\u540d\u5b57\uff0c\u5373\u751f\u6210\/sys\/class\/leds\/led2 gpios\uff1a\u524d\u4e24\u4e2a\u503c\u6307\u5b9a\u4e86\u8be5LED\u6240\u8fde\u63a5\u7684GPIO\u3002\u7b2c\u4e09\u4e2a\u503c\u53ef\u586bGPIO_ACTIVE_HIGH\u6216GPIO_ACTIVE_LOW\u3002GPIO_ACTIVE_HIGH\u4ee3\u8868\u9ad8\u7535\u5e73\u70b9\u4eaeLED\uff0cGPIO_ACTIVE_LOW\u4ee3\u8868\u4f4e\u7535\u5e73\u70b9\u4eaeLED\u3002 \u8fd9\u91cc\u6ce8\u610f\u4e86\uff0cgpios\u5c5e\u6027\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\uff0c\u4ee3\u8868\u8be5gpio\u70b9\u4eaeLED\u662f\u9700\u8981\u9ad8\u7535\u5e73\u8fd8\u662f\u4f4e\u7535\u5e73\uff0c\u6ce8\u610f\u662f\u70b9\u4eaeLED\uff0c\u7ec6\u54c1 default-state\uff1aon\u4ee3\u8868\u9ed8\u8ba4\u60c5\u51b5LED\u662f\u70b9\u4eae\u7684\uff0coff\u4ee3\u8868\u9ed8\u8ba4LED\u7184\u706d \u8fd9\u91cc\u53c8\u6ce8\u610f\u4e86\uff0c\u5f53defalut-state\u4e3aon\u65f6\uff0c\u5b9e\u9645\u4e0agpio\u8f93\u51fa\u7684\u7535\u5e73\uff0c\u5c31\u662fgpios\u5c5e\u6027\u4e2d\u6307\u5b9a\u7684\u70b9\u4eaeLED\u65f6\u7684\u7535\u5e73 \u8bbe\u5907\u6811\u914d\u7f6e\u597d\u540e\uff0c\u7f16\u8bd1\u5e76\u66f4\u6362dtb\uff0c\u7136\u540e\u91cd\u542f\u5f00\u53d1\u677f\u3002\u53ef\u4ee5\u770b\u5230\/sys\/class\/leds\/led2\u76ee\u5f55\uff1a \/sys\/class\/leds\/led2\/\u76ee\u5f55\u4e0b\u6709\u4e00\u4e2abrightnes\u6587\u4ef6\uff0c\u53ef\u4ee5\u901a\u8fc7echo cat\u7684\u65b9\u5f0f\u67e5\u770b\u548c\u4fee\u6539LED\u7684\u4eae\u5ea6\u3002\u56e0\u4e3aLED\u8fde\u63a5\u5728GPIO\u4e0a\uff0c\u6240\u4ee5\u4eae\u5ea6\u53ea\u67090\u548c1\uff0c\u5728\u672c\u6587\u793a\u4f8b\u7684led2\u4e2d\uff0c0\u8868\u793a\u70b9\u4eae\uff0c1\u8868\u793a\u7184\u706d\u3002 \u70b9\u4eaeLED\uff1a echo&nbsp;0&nbsp;&amp;gt;&nbsp;\/sys\/class\/leds\/led2\/brightness \u767b\u5f55\u540e\u590d\u5236 \u7184\u706dLED\uff1a echo&nbsp;1&nbsp;&amp;gt;&nbsp;\/sys\/class\/leds\/led2\/brightness \u767b\u5f55\u540e\u590d\u5236 \u5e94\u7528\u5c42\u63a7\u5236 \u9664\u4e86\u53ef\u4ee5\u5728shell\u4e2d\u901a\u8fc7echo\u3001cat\u7684\u65b9\u5f0f\u63a7\u5236Led\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728\u5199\u4e00\u4e2a\u5e94\u7528\u5c42\u7a0b\u5e8f\u6765\u64cd\u4f5c\/sys\/class\/leds\/\u4e0b\u7684\u8282\u70b9\uff0c\u5e94\u7528\u5c42\u4ee3\u7801\uff1a #include&nbsp;&lt;stdio.h&gt; #include&nbsp;&lt;stdlib.h&gt; #include&nbsp;&lt;unistd.h&gt; #include&nbsp;&lt;errno.h&gt; #include&nbsp;&lt;fcntl.h&gt; #include&nbsp;&lt;string.h&gt; #include&nbsp;&lt;sys&gt; #include&nbsp;&lt;sys&gt; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-62009","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/62009","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=62009"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/62009\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=62009"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=62009"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=62009"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}