Radxa Rock\u4e3b\u677f\u4e0a\u63d0\u4f9b\u4e86\u4e09\u4e2aLED\u706f\uff0c\u5206\u522b\u662f\u84dd\u7eff\u7ea2\uff0c\u5728Ubuntu\u548cAndriod\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\/sys\/class\/leds\/\u989c\u8272\/trigger\u6765\u63a7\u5236\u3002Linux\u5185\u6838\u6587\u6863https:\/\/www.kernel.org\/doc\/Documentation\/leds\/leds-class.txt\u63d0\u4f9b\u4e86\u5173\u4e8eled\u7684\u76f8\u5173\u8bf4\u660e\uff0c\u901a\u8fc7\u6267\u884c<\/p>\n
cat \/sys\/class\/leds\/red\/trigger<\/pre>\n\u53ef\u4ee5\u770b\u5230\u63d0\u4f9b\u7684\u63a7\u5236\u547d\u4ee4\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5199\u5165\u4fe1\u606f\u5230trigger\u5c31\u53ef\u4ee5\u63a7\u5236Led\u7684\u5f00\u5173\u53ca\u52a8\u4f5c\u3002<\/p>\n
\u4e0b\u9762\u7b80\u5355\u7ffb\u8bd1\u4e0bleds-class\u539f\u6587\uff1a<\/p>\n
Linux\u4e0bLED\u63a7\u5236\r\n==============\r\n\r\n\u5982\u679c\u4f60\u60f3\u63a7\u5236\u952e\u76d8LED\uff0c\u5b83\u4eec\u88ab\u8f93\u5165\u5b50\u7cfb\u7edf\u63a7\u5236\u800c\u4e0d\u9700\u8981Led\u7c7b\u3002\r\n\r\nLED\u7c7b\u5141\u8bb8\u4ece\u7528\u6237\u7a7a\u95f4\u901a\u8fc7\u7b80\u5355\u7684\u65b9\u5f0f\u63a7\u5236LED\u3002LED\u51fa\u73b0\u5728\/sys\/class\/leds\/\u4e0b\uff0c\u6700\u5927\u4eae\u5ea6\u5b9a\u4e49\u5728max_brightness\u6587\u4ef6\uff0cbrightness\u6587\u4ef6\u7528\u6765\u8bbe\u7f6eLED\u7684\u4eae\u5ea6\uff080-max_brightness\u4e4b\u95f4\uff09\u3002\u5927\u591a\u6570LED\u6ca1\u6709\u786c\u4ef6\u4eae\u5ea6\u652f\u6301\uff0c\u6240\u4ee5\u5bf9\u4e8e\u975e0\u503c\u4e5f\u53ea\u662f\u6253\u5f00\u800c\u5df2\u3002\r\n\r\n\u8fd9\u4e2a\u7c7b\u578b\u4e5f\u63d0\u4f9b\u4e86\u4e00\u4e2a\u53ef\u9009\u7684LED\u89e6\u53d1\u5668\u6982\u5ff5\u3002\u89e6\u53d1\u5668(trigger)\u662f\u4e00\u4e2a\u57fa\u4e8e\u5185\u6838\u7684Led\u4e8b\u4ef6\u6e90\u3002\u89e6\u53d1\u5668\u53ef\u4ee5\u5f88\u7b80\u5355\u4e5f\u53ef\u4ee5\u5f88\u590d\u6742\u3002\u4e00\u4e2a\u7b80\u5355\u7684\u89e6\u53d1\u5668\u4e0d\u53ef\u914d\u7f6e\u5e76\u88ab\u8bbe\u8ba1\u7528\u6765\u4ee5\u6700\u5c11\u7684\u4ee3\u7801\u6765\u9002\u914d\u5df2\u6709\u7684\u5b50\u7cfb\u7edf\u3002\u4f8b\u5982ide\u78c1\u76d8\u3001\u95ea\u5b58\u76d8\u6216\u5145\u7535\u89e6\u53d1\u5668\u3002\u5f53Led\u89e6\u53d1\u5668\u88ab\u7981\u7528\uff0c\u5bf9\u5e94\u7684\u4ee3\u7801\u5df2\u7ecf\u4f18\u5316\u3002\r\n\r\n\u5bf9\u4e8e\u6240\u6709\u62e5\u6709LED\u7279\u5b9a\u53c2\u6570\u7684\u89e6\u53d1\u5668\uff0c \u590d\u6742\u7684\u89e6\u53d1\u5668\u767d\u540d\u5355\u53ef\u4ee5\u7528\u4e8e\u6bcf\u4e00\u4e2a\u57fa\u7840\u7684LED\u3002\u5b9a\u65f6\u89e6\u53d1\u5668\u662f\u4e00\u4e2a\u4f8b\u5b50\u3002\u5b9a\u65f6\u89e6\u53d1\u5668\u5c06\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4\u4fee\u6539LED\u4eae\u5ea6\u5728LED_OFF\u548c\u5f53\u524d\u4eae\u5ea6\u503c\u4e4b\u95f4,\u201c\u5f00\u542f\u201d\u548c\u5173\u95ed\u7684\u65f6\u95f4\u53ef\u4ee5\u5728\/sys\/class\/leds\/<device>\/delay_{on,off}\u4e2d\u6307\u5b9a\uff08\u5355\u4f4d\u4e3a\u6beb\u79d2\uff09\u3002\u4f60\u53ef\u4ee5\u72ec\u7acb\u4fee\u6539\u4e00\u4e2a\u72ec\u7acbLED\u7684\u5b9a\u65f6\u5668\u7684\u4eae\u5ea6\u503c\u3002\u7136\u800c\uff0c\u5982\u679c\u4f60\u8bbe\u7f6e\u4eae\u5ea6\u503c\u4e3aLED_OFF\uff0c\u5b83\u5c06\u540c\u65f6\u7981\u7528\u65f6\u95f4\u89e6\u53d1\u5668\u3002\r\n\r\n\u4f60\u53ef\u4ee5\u7528\u4e00\u4e2a\u7684\u65b9\u6cd5\u6765\u4fee\u6539\u9009\u5b9a\u7684IO\u89c4\u5212\u5668(\u901a\u8fc7\/sys\/class\/leds\/<device>\/trigger\uff09\u6765\u4fee\u6539\u89e6\u53d1\u5668\u3002\u4e00\u65e6\u4e00\u4e2a\u6307\u5b9a\u7684\u89e6\u53d1\u5668\u88ab\u9009\u62e9\uff0c\u89e6\u53d1\u5668\u6307\u5b9a\u7684\u53c2\u6570\u4f1a\u51fa\u73b0\u5728\/sys\/class\/leds\/<device>.\r\n\r\n\r\n\u8bbe\u8ba1\u7406\u5ff5\r\n========\r\n\r\n\u4e0b\u9762\u7684\u8bbe\u8ba1\u7406\u8bba\u5f88\u7b80\u5355\u3002LED\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u8bbe\u5907\uff0c\u76ee\u6807\u662f\u7528\u5c11\u91cf\u7684\u4ee3\u7801\u63d0\u4f9b\u5c3d\u591a\u7684\u529f\u80fd\u3002\u5f53\u589e\u5f3a\u529f\u80fd\u65f6\u8bf7\u8bb0\u4f4f\u8fd9\u4e00\u70b9\u3002\r\n\r\n\r\nLED\u8bbe\u5907\u547d\u540d\r\n=================\r\n\r\n\u5f53\u524d\u683c\u5f0f\u662f:\r\n\r\n\"devicename:colour:function\"\r\n\r\n\u6709\u4e00\u4e9b\u4f8b\u5982\u989c\u8272\u7b49LED\u7c7b\u7684\u5c5e\u6027\u7684\u8c03\u7528\u88ab\u5bfc\u51fa\u3002\u505a\u4e3a\u4e00\u4e2a\u89e3\u51b3\u65b9\u6848\u4e0d\u5e94\u627f\u62c5\u8fc7\u591a\u7684\u5f00\u9500\uff0c\u6211\u5efa\u8bae\u5b83\u4eec\u6210\u4e3a\u540d\u5b57\u7684\u4e00\u90e8\u5206\u3002\u4e0a\u9762\u7684\u547d\u540d\u683c\u5f0f\u4e3a\u5c06\u6765\u7684\u9700\u8981\u7684\u5c5e\u6027\u7559\u4e0b\u4e86\u7a7a\u95f4\u3002\u5982\u679c\u9009\u62e9\u7684\u540d\u79f0\u6ca1\u6709\u7528\uff0c\u53ea\u9700\u8981\u7559\u7a7a\u5c31\u53ef\u4ee5\u3002\r\n\r\nLED\u7684\u786c\u4ef6\u95ea\u52a8\u52a0\u901f\r\n==================================\r\n\r\n\u4e00\u4e9bLED\u53ef\u4ee5\u4e0eCPU\u7f16\u7801\u63a7\u5236\u95ea\u70c1\u3002\u8981\u652f\u6301\u8fd9\u4e00\u7279\u6027\uff0cLED\u9a71\u52a8\u53ef\u4ee5\u5b9e\u73b0blink_set\u51fd\u6570\uff08\u67e5\u770b<linux\/leds.h>\uff09\u3002\u8981\u8bbe\u7f6e\u4e00\u4e2aLED\u95ea\u70c1\uff0c\u5f53\u7136\uff0c\u66f4\u597d\u7684\u529e\u6cd5\u662f\u7528API\u51fd\u6570led_blink_set(),\u5b83\u5c06\u68c0\u67e5\u5e76\u5728\u5fc5\u8981\u65f6\u56de\u843d\u5230\u8f6f\u4ef6\u5b9e\u73b0\u3002\r\n\u8981\u91cd\u65b0\u5173\u95ed\u95ea\u70c1\uff0c\u4f7f\u7528\u51fd\u6570led_brightness_set()\uff0c\u5b83\u5c06\u4e0d\u4ec5\u8bbe\u7f6eLED\u4eae\u5ea6\uff0c\u8fd8\u505c\u6b62\u4efb\u4f55\u95ea\u70c1\u9700\u8981\u7684\u8f6f\u4ef6\u5b9a\u65f6\u5668\u3002\r\n\r\n\u5982\u679c\u4f60\u8c03\u7528blink_set()\u51fd\u6570\u65f6\u53c2\u6570*delay_on==0 \u5e76\u4e14 *delay_off==0\uff0c\u5e94\u8be5\u9009\u62e9\u4e00\u4e2a\u7528\u6237\u53cb\u597d\u7684\u95ea\u70c1\u503c\u3002\u8fd9\u662f\u56e0\u4e3a\u9a71\u52a8\u5c06\u653e\u5f03Led\u5b50\u7cfb\u7edf\u7684delay_on\u548cdelay_off\u53c2\u6570\u503c\u3002\r\n\r\n\u901a\u8fc7brightness_set()\u8bbe\u7f6e\u4eae\u5ea6\u4e3a0\u5c06\u5b8c\u5168\u5173\u95edLED\u5e76\u4e14\u53d6\u6d88\u524d\u9762\u7f16\u7a0b\u7684\u786c\u4ef6\u95ea\u70c1\u51fd\u6570\uff08\u5982\u679c\u5b58\u5728\uff09\u3002\r\n\r\n\u5df2\u77e5\u95ee\u9898\r\n========\r\n\r\nLED\u89e6\u53d1\u5668\u5185\u6838\u56e0\u4e3a\u7b80\u5355\u89e6\u53d1\u5668\u51fd\u6570\u4f1a\u5f15\u8d77\u4f9d\u8d56\u6027\u95ee\u9898\u800c\u4e0d\u80fd\u6210\u4e3a\u4e00\u4e2a\u6a21\u5757\u3002\u76f8\u5bf9\u4e8e\u7b80\u5355\u89e6\u53d1\u5668\u529f\u80fd\u5e26\u6765\u7684\u597d\u5904\uff0c\u6211\u8ba4\u4e3a\u8fd9\u662f\u4e00\u4e2a\u5c0f\u95ee\u9898\u3002\u5269\u4e0b\u7684\u7684LED\u5b50\u7cfb\u7edf\u53ef\u4ee5\u6a21\u5757\u5316\u3002\r\n\r\n\r\n\u672a\u6765\u5f00\u53d1\uff08\u7565\uff09\r\n=============<\/pre>\n<\/p>\n","protected":false},"excerpt":{"rendered":"
Radxa Rock\u4e3b\u677f\u4e0a\u63d0\u4f9b\u4e86\u4e09\u4e2aLE […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[21],"tags":[155,124,122],"class_list":["post-1124","post","type-post","status-publish","format-standard","hentry","category-misc","tag-led","tag-radxa","tag-rock"],"views":4360,"_links":{"self":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1124","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1124"}],"version-history":[{"count":3,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1124\/revisions"}],"predecessor-version":[{"id":1129,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1124\/revisions\/1129"}],"wp:attachment":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1124"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1124"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}