{"id":109,"date":"2023-10-24T14:26:19","date_gmt":"2023-10-24T06:26:19","guid":{"rendered":"http:\/\/152.136.53.188\/?p=109"},"modified":"2025-05-03T09:56:01","modified_gmt":"2025-05-03T01:56:01","slug":"spidevlinuxspi","status":"publish","type":"post","link":"https:\/\/www.xuzhe.tj.cn\/index.php\/2023\/10\/24\/spidevlinuxspi\/","title":{"rendered":"spidev\uff1aLinux\u5185\u6838\u4e2d\u7684\u7528\u6237\u7a7a\u95f4SPI\u63a5\u53e3"},"content":{"rendered":"\n<p>\u64b0\u5199\u65f6\u95f4\uff1a2023\/10\/24<\/p>\n\n\n<h2 class=\"wp-block-heading\">1 \u7b80\u4ecb<\/h2>\n\n\n<p>SPI\uff08\u4e32\u884c\u5916\u8bbe\u63a5\u53e3\uff09\u662f\u4e00\u79cd\u5e38\u7528\u7684\u901a\u4fe1\u534f\u8bae\uff0c\u7528\u4e8e\u9ad8\u901f\u5168\u53cc\u5de5\u901a\u4fe1\u3002Linux\u5185\u6838\u63d0\u4f9b\u4e86\u4e00\u79cd\u540d\u4e3aspidev\u7684\u7528\u6237\u7a7a\u95f4\u63a5\u53e3\uff0c\u7528\u4e8e\u8bbf\u95eeSPI\u8bbe\u5907\u3002 <\/p>\n\n\n<p>spidev\u662f\u4e00\u4e2a\u4f4d\u4e8eLinux\u5185\u6838\u7a7a\u95f4\u7684\u63a5\u53e3\u7a0b\u5e8f\u3002\u5176\u4f5c\u7528\u662f\u5145\u5f53\u7528\u6237\u7a0b\u5e8f\u4e0e\u5185\u6838\u7a7a\u95f4SPI\u6838\u5fc3\u5e95\u5c42\u9a71\u52a8\u4e4b\u95f4\u7684\u6865\u6881\u3002\u901a\u8fc7spidev\u63a5\u53e3\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u76f4\u63a5\u5728\u7528\u6237\u7a7a\u95f4\u8fdb\u884c\u7a0b\u5e8f\u5f00\u53d1\u4ee5\u8c03\u7528\u5e95\u5c42SPI\u9a71\u52a8\uff0c\u8fd9\u5927\u5927\u964d\u4f4e\u4e86SPI\u9a71\u52a8\u5f00\u53d1\u7684\u95e8\u69db\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u8bbe\u5907\u9a71\u52a8\u7684\u5f00\u53d1\u9700\u8981\u5728\u5185\u6838\u7a7a\u95f4\u4e2d\u8fdb\u884c\uff0c\u8fd9\u5bf9\u5927\u591a\u6570\u5f00\u53d1\u8005\u6765\u8bf4\u662f\u4e00\u9879\u76f8\u5bf9\u590d\u6742\u548c\u964c\u751f\u7684\u4efb\u52a1\u3002\u7136\u800c\uff0c\u7531\u4e8espidev\u7684\u5b58\u5728\uff0c\u5f00\u53d1\u8005\u65e0\u9700\u6df1\u5165\u4e86\u89e3\u6216\u5b66\u4e60\u5185\u6838\u5f00\u53d1\u7684\u5404\u79cd\u65b9\u6cd5\u4e0e\u6d41\u7a0b\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u719f\u6089\u7684\u5f00\u53d1\u5de5\u5177\u548c\u8bed\u8a00\uff0c\u6765\u8f7b\u677e\u5730\u5b8c\u6210SPI\u9a71\u52a8\u7684\u5f00\u53d1\u3002\u8fd9\u6837\uff0c\u5373\u4fbf\u662f\u4e0d\u719f\u6089\u5185\u6838\u5f00\u53d1\u7684\u4eba\u5458\u4e5f\u80fd\u66f4\u65b9\u4fbf\u5730\u8fdb\u884cSPI\u901a\u8baf\u5f00\u53d1\u3002<\/p>\n\n<!--more-->\n\n<h3 class=\"wp-block-heading\">1.1 \u4e3b\u8981\u4f18\u70b9<\/h3>\n\n\n<ol class=\"wp-block-list\">\n<li>\u5b89\u5168\u6027\uff1a\u56e0\u4e3a\u7528\u6237\u7a7a\u95f4\u4e0e\u5185\u6838\u7a7a\u95f4\u7684\u9694\u79bb\uff0c\u5373\u4f7f\u4ee3\u7801\u5b58\u5728\u9519\u8bef\uff0c\u4e5f\u4e0d\u4f1a\u5bfc\u81f4\u6574\u4e2aLinux\u7cfb\u7edf\u5d29\u6e83\u6216\u4e0d\u7a33\u5b9a\u3002<\/li>\n\n\n\n<li>\u6613\u7528\u6027\uff1a\u7528\u6237\u7a7a\u95f4\u63d0\u4f9b\u4e86\u66f4\u591a\u6613\u7528\u548c\u5f3a\u5927\u7684\u5f00\u53d1\u5de5\u5177\u548c\u5e93\uff0c\u6bd4\u5982\u5404\u79cd\u8bed\u8a00\u7684SDK\u3001\u8c03\u8bd5\u5de5\u5177\u7b49\u3002\u53ef\u4ee5\u4f7f\u7528C\u3001C++\u3001Python\u7b49\u8bed\u8a00\u8fdb\u884c\u5f00\u53d1\u3002<\/li>\n\n\n\n<li>\u5feb\u901f\u8fed\u4ee3\uff1a\u7531\u4e8e\u5728\u7528\u6237\u7a7a\u95f4\u4e2d\u8fdb\u884c\u5f00\u53d1\uff0c\u4ee3\u7801\u7684\u7f16\u8bd1\u548c\u6d4b\u8bd5\u5468\u671f\u901a\u5e38\u66f4\u77ed\uff0c\u8fd9\u6709\u52a9\u4e8e\u5feb\u901f\u8fed\u4ee3\u548c\u4f18\u5316\u3002<br><\/li>\n<\/ol>\n\n\n<h3 class=\"wp-block-heading\">1.2 \u5e94\u7528\u573a\u666f<\/h3>\n\n\n<ol class=\"wp-block-list\">\n<li>\u539f\u578b\u5f00\u53d1\uff1a\u5982\u679c\u4f60\u53ea\u662f\u9700\u8981\u8fdb\u884c\u4e00\u4e9b\u57fa\u7840\u7684\u529f\u80fd\u6d4b\u8bd5\u6216\u8005\u539f\u578b\u8bbe\u8ba1\uff0cspidev\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u9009\u62e9\u3002<\/li>\n\n\n\n<li>\u7b80\u5355\u9a71\u52a8\u7a0b\u5e8f\u7684\u5f00\u53d1\uff1a\u5bf9\u4e8e\u90a3\u4e9b\u4e0d\u9700\u8981\u8bbf\u95ee\u5185\u6838\u9ad8\u7ea7\u529f\u80fd\uff08\u5982\u4e2d\u65ad\u5904\u7406\uff09\u7684\u9879\u76ee\uff0c\u4f7f\u7528spidev\u80fd\u5feb\u901f\u5730\u5b8c\u6210\u9a71\u52a8\u7a0b\u5e8f\u7684\u5f00\u53d1\u3002<br><\/li>\n<\/ol>\n\n\n<h3 class=\"wp-block-heading\">1.3 spidev\u7684\u5c40\u9650\u6027<\/h3>\n\n\n<p>\u867d\u7136spidev\u63d0\u4f9b\u4e86\u4e00\u4e2a\u76f8\u5bf9\u7b80\u4fbf\u7684\u65b9\u5f0f\u6765\u8bbf\u95eeSPI\u8bbe\u5907\uff0c\u5b83\u6709\u4e00\u4e9b\u60c5\u51b5\u4e0b\u4e0d\u80fd\u5b8c\u5168\u66ff\u4ee3\u4e13\u95e8\u7684SPI\u8bbe\u5907\u9a71\u52a8\u3002\u8fd9\u662f\u56e0\u4e3aspidev\u4e3b\u8981\u7528\u4e8e\u5728Linux\u5185\u6838\u4e0eSPI\u4e3b\u8bbe\u5907\u4e4b\u95f4\u8fdb\u884c\u901a\u4fe1\uff0c\u4f46\u5f53\u9700\u8981\u8bbf\u95ee\u5185\u6838\u7a7a\u95f4\u7684\u9ad8\u7ea7\u63a5\u53e3\u529f\u80fd\uff0c\u5982\u4e2d\u65ad\u5904\u7406\u7b49\uff0cspidev\u5c31\u663e\u5f97\u529b\u4e0d\u4ece\u5fc3\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5f00\u53d1\u8005\u5e94\u5f53\u8003\u8651\u76f4\u63a5\u5728\u5185\u6838\u7a7a\u95f4\u5f00\u53d1SPI\u9a71\u52a8\u7a0b\u5e8f\uff0c\u800c\u4e0d\u662f\u4f9d\u8d56\u4e8espidev\u5728\u7528\u6237\u7a7a\u95f4\u8fdb\u884c\u7f16\u7a0b\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">2 spidev\u7684\u5b89\u88c5<\/h2>\n\n\n<p>\u4ee5openwrt\u7cfb\u7edf\u4e3a\u4f8b\uff0c\u4ecb\u7ecd\u542f\u7528spidev\u6a21\u5757\u7684\u65b9\u6cd5\u3002\u5728openwrt\u7cfb\u7edf\u4e2d\uff0c\u9ed8\u8ba4\u662f\u6ca1\u6709\u542f\u7528spidev\u6a21\u5757\u7684\uff0c\u6709\u4e24\u79cd\u542f\u7528\u65b9\u6cd5\uff1a\u4e00\u79cd\u662f\u5728openwrt\u7cfb\u7edf\u4e2d\u5b89\u88c5spidev\u6a21\u5757\u5305\uff0c\u8fd9\u79cd\u65b9\u6cd5\u8f83\u4e3a\u7b80\u5355\uff1b\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528<code>make menuconfig<\/code>\u914d\u7f6eopenwrt\u7684\u6e90\u4ee3\u7801\uff0c\u7136\u540e\u91cd\u65b0\u7f16\u8bd1\uff0c\u6b64\u65b9\u6cd5\u8f83\u590d\u6742\uff0c\u6d89\u53ca\u5230linux\u6e90\u7801\u7684\u914d\u7f6e\u4e0e\u7f16\u8bd1\u7b49\u5185\u5bb9\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">2.1 \u5b89\u88c5spidev\u5305\u7684\u65b9\u6cd5<\/h3>\n\n\n<p>\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u9700\u8981\u91cd\u65b0\u7f16\u8bd1openwrt\u7cfb\u7edf\uff0c\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n\n\n<p>1\uff09\u83b7\u53d6<code>kmod-spi-dev<\/code>ipk\u5b89\u88c5\u5305<\/p>\n\n\n<p>\u5728<a href=\"http:\/\/openwrt.jaru.eu.org\/gargoyle-pl\/chaos_calmer\/ramips\/packages\/\" title=\"kmod-spi-dev\u4e0b\u8f7d\u6e90\">http:\/\/openwrt.jaru.eu.org\/gargoyle-pl\/chaos_calmer\/ramips\/packages\/<\/a>\u4e2d\u6839\u636eopenwrt\u7684\u7248\u672c\u4e0b\u8f7d\u201dkmod-spi-dev-\u2026 .ipk\u201d\u7684\u5b89\u88c5\u5305\u3002\u8fd9\u4e2a\u6e90\u6bd4\u5b98\u7f51\u66f4\u5168\u3002<\/p>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"2088\" height=\"382\" src=\"http:\/\/152.136.53.188\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.29.24@2x.png\" alt=\"\" class=\"wp-image-107\" srcset=\"https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.29.24@2x.png 2088w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.29.24@2x-300x55.png 300w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.29.24@2x-1024x187.png 1024w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.29.24@2x-768x141.png 768w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.29.24@2x-1536x281.png 1536w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.29.24@2x-2048x375.png 2048w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.29.24@2x-624x114.png 624w\" sizes=\"auto, (max-width: 2088px) 100vw, 2088px\" \/><\/figure>\n<\/div>\n\n<p>\u6211\u7684openwrt\u7248\u672c\u662f <code>Chaos Calmer 15.05.1<\/code>\u3002\u5728\u8fd9\u91cc\u67e5\u770b\u5176\u5b83openwrt\u7248\u672c\u3002<a href=\"http:\/\/openwrt.jaru.eu.org\/gargoyle-pl\/\">http:\/\/openwrt.jaru.eu.org\/gargoyle-pl\/<\/a><\/p>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"774\" height=\"760\" src=\"http:\/\/152.136.53.188\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.35.15@2x.png\" alt=\"\" class=\"wp-image-105\" style=\"aspect-ratio:1.018421052631579;width:261px;height:auto\" srcset=\"https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.35.15@2x.png 774w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.35.15@2x-300x295.png 300w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.35.15@2x-768x754.png 768w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.35.15@2x-624x613.png 624w\" sizes=\"auto, (max-width: 774px) 100vw, 774px\" \/><\/figure>\n<\/div>\n\n<p>openwrt\u7684\u7248\u672c\u4ee5\u53calinux\u5185\u6838\u7248\u672c\u53f7\uff0c\u53ef\u4ee5\u5728luci\u754c\u9762\u67e5\u770b\u3002\u5728\u6d4f\u89c8\u5668\u4e2d\u8f93\u5165openwrt\u7684IP\u5730\u5740\uff0c\u767b\u9646\u540e\u5c31\u80fd\u770b\u5230\u3002<br><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-106\" src=\"http:\/\/152.136.53.188\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.40.50@2x.png\" width=\"1964\" height=\"642\" srcset=\"https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.40.50@2x.png 1964w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.40.50@2x-300x98.png 300w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.40.50@2x-1024x335.png 1024w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.40.50@2x-768x251.png 768w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.40.50@2x-1536x502.png 1536w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/CleanShot-2023-10-24-at-10.40.50@2x-624x204.png 624w\" sizes=\"auto, (max-width: 1964px) 100vw, 1964px\" \/><\/p>\n\n\n<p>2\uff09\u5b89\u88c5ipk\u5305<\/p>\n\n\n<p>\u5c06ipk\u5305\u62f7\u8d1d\u5230openwrt\u7cfb\u7edf\u540e\uff0c\u6267\u884c<code>opkg install<\/code>\u547d\u4ee4\u5b89\u88c5\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>opkg install kmod-spi-dev*.ipk<\/code><\/pre>\n\n\n<h3 class=\"wp-block-heading\">2.2 \u914d\u7f6e\u5e76\u7f16\u8bd1\u6e90\u4ee3\u7801\u7684\u65b9\u6cd5<\/h3>\n\n\n<p>\u5728openwrt\u6e90\u4ee3\u7801\u7684\u6839\u76ee\u5f55\u4e0b\uff0c\u4f7f\u7528<code>make menuconfig<\/code>\u547d\u4ee4\u6253\u5f00\u914d\u7f6e\u7a97\u53e3\uff0c\u5728<code>Kernel modules-&gt;SPI Support<\/code>\u4e2d\uff0c\u9009\u4e2d<code>kmod-spi-dev<\/code>\u3002\u8fd9\u91cc\u7684<code>kmod-spi-dev<\/code>\u5373\u662f\u9700\u8981\u5f00\u542f\u7684spidev\u6a21\u5757\u3002<\/p>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"890\" height=\"418\" src=\"http:\/\/152.136.53.188\/wp-content\/uploads\/2023\/10\/Image.png\" alt=\"Image.png\" class=\"wp-image-108\" srcset=\"https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Image.png 890w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Image-300x141.png 300w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Image-768x361.png 768w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Image-624x293.png 624w\" sizes=\"auto, (max-width: 890px) 100vw, 890px\" \/><figcaption class=\"wp-element-caption\">Image.png<\/figcaption><\/figure>\n<\/div>\n\n<p>\u4fdd\u5b58\u9000\u51fa\u540e\u3002\u5728openwrt\u6e90\u4ee3\u7801\u7684\u6839\u76ee\u5f55\u4e0b\uff0c\u6267\u884cmake\u547d\u4ee4\u91cd\u65b0\u7f16\u8bd1openwrt\u7cfb\u7edf:<\/p>\n\n\n<pre class=\"wp-block-code\"><code>make V=s j=2\n<\/code><\/pre>\n\n\n<p>\u5176\u4e2d <code>V=s j=2<\/code> \u662fmake\u7f16\u8bd1\u547d\u4ee4\u7684\u53c2\u6570\u3002\u4f7f\u7528\u4e862\u4e2a\u7ebf\u7a0b\u7f16\u8bd1\u3002\u5982\u679c\u7f16\u8bd1\u51fa\u73b0\u95ee\u9898\uff0c\u9700\u8981\u67e5\u770b\u5177\u4f53\u7684\u51fa\u9519\u60c5\u51b5\u65f6\uff0c\u9700\u8981\u628a<code>j = 2<\/code>\u53bb\u6389\uff0c\u5373\u4f7f\u7528<code>make V=s<\/code>\u91cd\u65b0\u7f16\u8bd1\u91cd\u65b0\u7f16\u8bd1\uff0c\u624d\u80fd\u770b\u5230\u51fa\u9519\u8be6\u60c5\u3002<\/p>\n\n\n<p>make \u53c2\u6570<code>V<\/code>\u4e0e<code>j<\/code>\u7684\u89e3\u91ca\uff1a<\/p>\n\n\n<p>1). <code>V=s<\/code> \u662f\u4e00\u4e2a\u73af\u5883\u53d8\u91cf\u8bbe\u7f6e\uff0c\u901a\u5e38\u7528\u4e8e\u63a7\u5236\u6784\u5efa\u8fc7\u7a0b\u4e2d\u7684\u8f93\u51fa\u8be6\u7ec6\u7a0b\u5ea6\u3002<\/p>\n\n\n<ul class=\"wp-block-list\">\n<li><code>V=0<\/code> \u6216\u8005\u6ca1\u6709\u8bbe\u7f6e <code>V<\/code> \u901a\u5e38\u610f\u5473\u7740\u53ea\u663e\u793a\u5fc5\u8981\u7684\u4fe1\u606f\u3002<\/li>\n\n\n\n<li><code>V=1<\/code> \u901a\u5e38\u7528\u4e8e\u663e\u793a\u66f4\u8be6\u7ec6\u7684\u6784\u5efa\u4fe1\u606f\u3002<\/li>\n\n\n\n<li><code>V=s<\/code> \u5728\u663e\u793a\u8be6\u7ec6\u7684\u8c03\u8bd5\u4fe1\u606f\uff0c\u4f46\u8fd9\u53d6\u51b3\u4e8e\u5177\u4f53\u7684 <code>Makefile<\/code> \u5982\u4f55\u5904\u7406\u8fd9\u4e2a\u53d8\u91cf\u3002<br><\/li>\n<\/ul>\n\n\n<p>2). <code>j=2<\/code> \u662f\u7528\u4e8e <code>make<\/code> \u7684\u4e00\u4e2a\u6807\u51c6\u9009\u9879\uff0c\u8868\u793a\u5e76\u884c\u7f16\u8bd1\uff0c\u5373\u540c\u65f6\u8fdb\u884c\u4e24\u4e2a\u4efb\u52a1\u3002<code>j<\/code> \u53c2\u6570\u540e\u9762\u7684\u6570\u5b57 <code>2<\/code> \u6307\u5b9a\u4e86\u53ef\u4ee5\u540c\u65f6\u8fdb\u884c\u7684\u4efb\u52a1\u6570\u91cf\u3002\u8fd9\u5728\u591a\u6838\u6216\u591a\u7ebf\u7a0b\u7684CPU\u4e0a\u662f\u6709\u7528\u7684\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u52a0\u901f\u6574\u4e2a\u6784\u5efa\u8fc7\u7a0b\u3002<\/p>\n\n\n<p>\u5728\u4f7f\u7528\u4e0a\u8ff0\u7684\u65b9\u6cd5\u5b89\u88c5spidev\u6a21\u5757\u6216\u7f16\u8bd1\u6e90\u7801\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684\u65b9\u6cd5\u67e5\u770bspidev\u5305\u662f\u5426\u5df2\u7ecf\u5b89\u88c5\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>opkg list-installed | grep spi\n<\/code><\/pre>\n\n\n<p>\u6267\u884c\u540e\u4f1a\u770b\u5230\u6240\u6709\u5df2\u7ecf\u5b89\u88c5\u7684\u540d\u79f0\u5305\u542bspi\u7684\u5305\u3002\u5176\u4e2d\u6709kmod-spi-dev\u8bf4\u660e\u5df2\u7ecf\u5b89\u88c5\u6210\u529f\u4e86\u3002<\/p>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"746\" height=\"452\" src=\"http:\/\/152.136.53.188\/wp-content\/uploads\/2023\/10\/Screenshot-from-2023-10-24-10-48-10.png\" alt=\"\" class=\"wp-image-103\" srcset=\"https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Screenshot-from-2023-10-24-10-48-10.png 746w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Screenshot-from-2023-10-24-10-48-10-300x182.png 300w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Screenshot-from-2023-10-24-10-48-10-624x378.png 624w\" sizes=\"auto, (max-width: 746px) 100vw, 746px\" \/><\/figure>\n<\/div>\n\n<h2 class=\"wp-block-heading\">3 \u5728DTS\u4e2d\u6dfb\u52a0spidev<\/h2>\n\n\n<p>\u5728\u5b89\u88c5spidev\u6a21\u5757\u540e\uff0c\u8fd8\u9700\u8981\u5728dts\uff08\u8bbe\u5907\u6811\uff09\u6587\u4ef6\u4e2d\u52a0\u5165spidev\u7684\u914d\u7f6e\u3002\u4ee5mt7628\u82af\u7247\u4e3a\u4f8b\uff0c\u5728mt7628.dts\u6587\u4ef6\u4e2d\u7684<code>palmbus@10000000<\/code>\u5c5e\u6027\u4e0b\u7684<code>spi@b00<\/code>\u4e2d\u52a0\u5165\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>spidev@1{\n    compatible = \"linux,spidev\";\n    reg = &lt;1 0&gt;;\n    spi-max-frequency = &lt;10000000&gt;;\n};\n<\/code><\/pre>\n\n\n<p>\u5b8c\u6574\u7684dts\u6587\u4ef6\u89c1\u6587\u540e\u3002<\/p>\n\n\n<p>\u5728openwrt\u7cfb\u7edf\u7684<code>\/dev<\/code>\u76ee\u5f55\u4e2d\u770b\u5230<code>spidevX.Y<\/code>\u5f62\u5f0f\u7684\u6587\u4ef6\u540d\u79f0\uff0c\u8bf4\u660espidev\u5df2\u7ecf\u5728\u52a0\u8f7d\u5230\u5185\u6838\u4e2d\uff0c\u7528\u6237\u7a7a\u95f4\u7a0b\u5e8f\u5c31\u53ef\u4ee5\u901a\u8fc7\u6807\u51c6\u7684open\/read\/write\/ioctl\u63a5\u53e3\u6765\u8bbf\u95ee\u8fd9\u4e2aSPI\u8bbe\u5907\u4e86\u3002<\/p>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"746\" height=\"452\" src=\"http:\/\/152.136.53.188\/wp-content\/uploads\/2023\/10\/Screenshot-from-2023-10-23-21-05-39.png\" alt=\"\" class=\"wp-image-104\" srcset=\"https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Screenshot-from-2023-10-23-21-05-39.png 746w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Screenshot-from-2023-10-23-21-05-39-300x182.png 300w, https:\/\/www.xuzhe.tj.cn\/wp-content\/uploads\/2023\/10\/Screenshot-from-2023-10-23-21-05-39-624x378.png 624w\" sizes=\"auto, (max-width: 746px) 100vw, 746px\" \/><\/figure>\n<\/div>\n\n<h2 class=\"wp-block-heading\">4 spidev\u901a\u8baf\u53c2\u6570\u7684\u8bbe\u5b9a\uff08C\/C++\uff09<\/h2>\n\n\n<p>\u5728\u5b8c\u6210\u4e86\u5b89\u88c5\u4ee5\u53cadts\u6587\u4ef6\u7684\u4fee\u6539\u540e\uff0c\u5c31\u53ef\u4ee5\u7f16\u7a0b\u4e86\u3002\u8fd9\u91cc\u4ee5C\/C++\u5f00\u53d1\u4e3a\u4f8b\u8bf4\u660e\u3002\u5982\u679c\u4f60\u4f7f\u7528python\uff0c\u53ef\u4ee5\u53bb\u8fd9\u91cc\u67e5\u770bpython\u8c03\u7528spidev\u63a5\u53e3\u7684\u65b9\u6cd5\u3002<a href=\"https:\/\/pypi.org\/project\/spidev\/\">https:\/\/pypi.org\/project\/spidev\/<\/a><\/p>\n\n\n<p>\u5728\u7f16\u5199\u5177\u4f53\u7684\u901a\u8baf\u4ee3\u7801\u4e4b\u524d\uff0c\u5148\u8981\u5bf9spi\u901a\u8baf\u7684\u53c2\u6570\u8fdb\u884c\u8bbe\u5b9a\u3002<code>ioctl()<\/code>\u51fd\u6570\u63d0\u4f9b\u4e86\u4e00\u79cd\u5f3a\u5927\u7684\u65b9\u5f0f\u6765\u4e0eSPI\u8bbe\u5907\u8fdb\u884c\u4ea4\u4e92\u3002\u5728\u672c\u8282\u4e2d\uff0c\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u51e0\u79cd\u91cd\u8981\u7684<code>ioctl()<\/code>\u8bf7\u6c42\uff0c\u8fd9\u4e9b\u8bf7\u6c42\u5141\u8bb8\u5f00\u53d1\u8005\u8bfb\u53d6\u6216\u66f4\u6539\u8bbe\u5907\u5f53\u524d\u7528\u4e8e\u6570\u636e\u4f20\u8f93\u7684\u53c2\u6570\u8bbe\u7f6e\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.1 SPI\u4f20\u8f93\u6a21\u5f0f<\/h3>\n\n\n<p>\u4f7f\u7528<code>SPI_IOC_RD_MODE<\/code>\u548c<code>SPI_IOC_WR_MODE<\/code>\u8bf7\u6c42\uff0c\u53ef\u4ee5\u83b7\u53d6\u6216\u8bbe\u7f6eSPI\u4f20\u8f93\u6a21\u5f0f\u3002\u8fd9\u4e9b\u8bf7\u6c42\u9700\u8981\u4e00\u4e2a\u6307\u5411\u5b57\u8282\uff08byte\uff09\u7684\u6307\u9488\uff0c\u8be5\u5b57\u8282\u5c06\u5b58\u50a8\u6216\u63a5\u6536SPI\u6a21\u5f0f\u3002<\/p>\n\n\n<ul class=\"wp-block-list\">\n<li>\u8bfb\u53d6\u6a21\u5f0f\uff08RD\uff09\uff1a\u83b7\u53d6\u5f53\u524d\u7684SPI\u6a21\u5f0f\u3002<\/li>\n\n\n\n<li>\u5199\u5165\u6a21\u5f0f\uff08WR\uff09\uff1a\u8bbe\u7f6e\u65b0\u7684SPI\u6a21\u5f0f\u3002<\/li>\n<\/ul>\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528\u9884\u5b9a\u4e49\u7684\u5e38\u91cf\uff0c\u5982<code>SPI_MODE_0<\/code>\u3001<code>SPI_MODE_1<\/code>\u7b49\uff0c\u6216\u8005\u76f4\u63a5\u4f7f\u7528<code>SPI_CPOL<\/code>\u548c<code>SPI_CPHA<\/code>\u6807\u5fd7\u6765\u8bbe\u7f6e\u65f6\u949f\u6781\u6027\u548c\u76f8\u4f4d\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.2 \u4f4d\u5bf9\u9f50\u65b9\u5f0f<\/h3>\n\n\n<p><code>SPI_IOC_RD_LSB_FIRST<\/code>\u548c<code>SPI_IOC_WR_LSB_FIRST<\/code>\u5141\u8bb8\u83b7\u53d6\u6216\u8bbe\u7f6e\u4f4d\u5bf9\u9f50\u65b9\u5f0f\u2014\u2014MSB-first\u6216LSB-first\u3002<\/p>\n\n\n<ul class=\"wp-block-list\">\n<li>MSB-first\uff1a\u6700\u9ad8\u6709\u6548\u4f4d\u4f18\u5148\u3002<\/li>\n\n\n\n<li>LSB-first\uff1a\u6700\u4f4e\u6709\u6548\u4f4d\u4f18\u5148\u3002<\/li>\n<\/ul>\n\n\n<p>\u6570\u503c\u4e3a0\uff0c\u8868\u793aMSB-first\uff0c\u4e5f\u662f\u9ed8\u8ba4\u7684\u8bbe\u5b9a\u503c\u3002\u5f53\u6570\u503c\u4e3a\u975e0\u65f6\uff0c\u8868\u793a\u5f88\u5c11\u4f7f\u7528\u7684LSB-first\u3002<\/p>\n\n\n<p>SPI\uff08\u4e32\u884c\u5916\u8bbe\u63a5\u53e3\uff09\u901a\u4fe1\u4e2d\uff0c\u6570\u636e\u4f20\u8f93\u7684\u4f4d\u5bf9\u9f50\u65b9\u5f0f\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u53c2\u6570\u3002\u4f4d\u5bf9\u9f50\u65b9\u5f0f\u51b3\u5b9a\u4e86\u5728SPI\u5b57\uff08\u901a\u5e38\u4e3a8\u4f4d\u621616\u4f4d\uff09\u4f20\u8f93\u8fc7\u7a0b\u4e2d\uff0c\u662f\u6700\u9ad8\u6709\u6548\u4f4d\uff08MSB\uff09\u4f18\u5148\u8fd8\u662f\u6700\u4f4e\u6709\u6548\u4f4d\uff08LSB\uff09\u4f18\u5148\u3002<\/p>\n\n\n<p>MSB-first\uff08\u6700\u9ad8\u6709\u6548\u4f4d\u4f18\u5148\uff09\uff1a\u5728\u8fd9\u79cd\u6a21\u5f0f\u4e0b\uff0c\u6bcf\u4e2aSPI\u5b57\u7684\u6700\u9ad8\u6709\u6548\u4f4d\uff08MSB\uff09\u5c06\u9996\u5148\u88ab\u53d1\u9001\u6216\u8bfb\u53d6\u3002\u8fd9\u662fSPI\u901a\u4fe1\u4e2d\u6700\u5e38\u89c1\u7684\u914d\u7f6e\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u4e00\u4e2a8\u4f4d\u7684\u5b57\u82820b11001010\uff0c\u90a3\u4e48\u6700\u5de6\u8fb9\u7684\u4f4d\uff08\u5373\u6700\u9ad8\u6709\u6548\u4f4d\uff0c\u8fd9\u91cc\u662f1\uff09\u5c06\u9996\u5148\u88ab\u53d1\u9001\u3002<\/p>\n\n\n<p>LSB-first\uff08\u6700\u4f4e\u6709\u6548\u4f4d\u4f18\u5148\uff09\uff1a\u4e0eMSB-first\u76f8\u53cd\uff0c\u5728LSB-first\u6a21\u5f0f\u4e0b\uff0c\u6bcf\u4e2aSPI\u5b57\u7684\u6700\u4f4e\u6709\u6548\u4f4d\uff08LSB\uff09\u4f1a\u9996\u5148\u88ab\u53d1\u9001\u6216\u8bfb\u53d6\u3002\u5728\u67d0\u4e9b\u7279\u5b9a\u5e94\u7528\u6216\u7279\u5b9a\u7c7b\u578b\u7684SPI\u8bbe\u5907\u4e2d\uff0c\u8fd9\u79cd\u914d\u7f6e\u53ef\u80fd\u4f1a\u66f4\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u76f8\u540c\u76848\u4f4d\u5b57\u82820b11001010\uff0c\u6700\u53f3\u8fb9\u7684\u4f4d\uff08\u5373\u6700\u4f4e\u6709\u6548\u4f4d\uff0c\u8fd9\u91cc\u662f0\uff09\u5c06\u9996\u5148\u88ab\u53d1\u9001\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.3 \u6bcf\u5b57\u4f4d\u6570<\/h3>\n\n\n<p>\u901a\u8fc7<code>SPI_IOC_RD_BITS_PER_WORD<\/code>\u548c<code>SPI_IOC_WR_BITS_PER_WORD<\/code>\uff0c\u53ef\u4ee5\u8bfb\u53d6\u6216\u8bbe\u7f6e\u6bcf\u4e2aSPI\u4f20\u8f93\u5b57\u4e2d\u7684\u4f4d\u6570\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u9ed8\u8ba4\u503c\u4e3a8\u4f4d\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.4 \u6700\u5927\u4f20\u8f93\u901f\u5ea6<\/h3>\n\n\n<p>\u4f7f\u7528<code>SPI_IOC_RD_MAX_SPEED_HZ<\/code>\u548c<code>SPI_IOC_WR_MAX_SPEED_HZ<\/code>\uff0c\u4f60\u53ef\u4ee5\u83b7\u53d6\u6216\u8bbe\u7f6eSPI\u8bbe\u5907\u7684\u6700\u5927\u4f20\u8f93\u901f\u5ea6\u3002\u8fd9\u9700\u8981\u4e00\u4e2a\u6307\u5411<code>u32<\/code>\u7c7b\u578b\u7684\u6307\u9488\uff0c\u8be5\u6307\u9488\u7528\u4e8e\u5b58\u50a8\u6216\u63a5\u6536\u901f\u5ea6\u503c\uff08\u4ee5Hz\u4e3a\u5355\u4f4d\uff09\u3002<\/p>\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u867d\u7136\u4f60\u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e2a\u7406\u60f3\u7684\u4f20\u8f93\u901f\u5ea6\uff0c\u4f46\u786c\u4ef6\u548c\u9a71\u52a8\u7a0b\u5e8f\u53ef\u80fd\u4e0d\u4e00\u5b9a\u652f\u6301\u4f60\u8bbe\u7f6e\u7684\u786e\u5207\u901f\u5ea6\u3002<\/p>\n\n\n<p>\u901a\u8fc7\u638c\u63e1\u8fd9\u4e9b<code>ioctl()<\/code>\u8bf7\u6c42\uff0c\u4f60\u5c06\u80fd\u66f4\u7075\u6d3b\u5730\u63a7\u5236SPI\u8bbe\u5907\uff0c\u4ece\u800c\u5b9e\u73b0\u66f4\u9ad8\u6548\u548c\u53ef\u5b9a\u5236\u7684\u6570\u636e\u4f20\u8f93\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u591f\u5e2e\u52a9\u4f60\u66f4\u6df1\u5165\u5730\u4e86\u89e3\u5982\u4f55\u4f7f\u7528<code>spidev<\/code>\u8fdb\u884cSPI\u7f16\u7a0b\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.5 \u5728C++\u4e2d\u4f7f\u7528spidev\u8bbe\u7f6eSPI\u8bbe\u5907\uff1a\u4e00\u4e2a\u5b9e\u4f8b\u89e3\u6790<\/h3>\n\n\n<p>\u4e0b\u9762\u662f\u4e00\u6bb5C++\u793a\u4f8b\u7a0b\u5e8f\uff0c\u4f7f\u7528<code>spidev<\/code>\u5e93\u548c<code>ioctl()<\/code>\u51fd\u6570\u6765\u521d\u59cb\u5316SPI\u8bbe\u5907\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;fcntl.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;sys\/ioctl.h&gt;\n#include &lt;linux\/spi\/spidev.h&gt;\n\nuint8_t mode = SPI_MODE_0;\nuint8_t bits = 8;\nuint32_t speed = 100000;\nconst char *device = \"\/dev\/spidev32766.1\";\n\nbool SPIDevice::Open_Initialize() {\n    fd = open(device, O_RDWR);\n    if (fd &lt; 0 || ioctl(fd, SPI_IOC_WR_MODE, &amp;mode) == -1 ||\n     \/\/   ioctl(fd, SPI_IOC_RD_MODE, &amp;mode) == -1 ||\n        ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &amp;bits) == -1 ||\n     \/\/   ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &amp;bits) == -1 ||\n        ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &amp;speed) == -1 ||\n     \/\/   ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &amp;speed) == -1\n     ) {\n        return false;\n    }\n    return true;\n}\n<\/code><\/pre>\n\n\n<p>\u7a0b\u5e8f\u4e2d\u5305\u542b\u4e86spidev\u7f16\u7a0b\u65f6\u8981\u5f15\u7528\u7684\u5934\u6587\u4ef6\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;fcntl.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;sys\/ioctl.h&gt;\n#include &lt;linux\/spi\/spidev.h&gt;\n<\/code><\/pre>\n\n\n<p>\u6211\u4eec\u7684\u7a0b\u5e8f\u793a\u4f8b\u5b9a\u4e49\u4e86\u4e00\u4e2a<code>SPIDevice<\/code>\u7c7b\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e2a<code>Open_Initialize()<\/code>\u6210\u5458\u51fd\u6570\u3002\u8fd9\u4e2a\u51fd\u6570\u6267\u884c\u4ee5\u4e0b\u51e0\u4e2a\u4e3b\u8981\u4efb\u52a1\uff1a<\/p>\n\n\n<ol class=\"wp-block-list\">\n<li>\u6253\u5f00SPI\u8bbe\u5907\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6eSPI\u4f20\u8f93\u6a21\u5f0f\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6eSPI\u5b57\u7684\u4f4d\u6570\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6eSPI\u7684\u6700\u5927\u4f20\u8f93\u901f\u5ea6\u3002<br><\/li>\n<\/ol>\n\n\n<h4 class=\"wp-block-heading\">4.5.1  \u6253\u5f00SPI\u8bbe\u5907<\/h4>\n\n\n<p><code>fd = open(device, O_RDWR);<\/code><\/p>\n\n\n<p>\u8fd9\u91cc\u4f7f\u7528Linux\u7684<code>open()<\/code>\u7cfb\u7edf\u8c03\u7528\u6765\u6253\u5f00SPI\u8bbe\u5907\u3002<code>O_RDWR<\/code>\u6807\u5fd7\u8868\u793a\u6211\u4eec\u5c06\u4ee5\u8bfb\u5199\u6a21\u5f0f\u6253\u5f00\u8bbe\u5907\u3002\u6253\u5f00\u6807\u5fd7\u7684\u8be6\u7ec6\u5185\u5bb9\u53ef\u4ee5\u770b\u8fd9\u91cc\uff1a<a href=\"#\">[open &#8211; open a file] https:\/\/pubs.opengroup.org\/onlinepubs\/7908799\/xsh\/open.html <\/a><\/p>\n\n\n<h4 class=\"wp-block-heading\">4.5.2 \u8bbe\u7f6eSPI\u4f20\u8f93\u6a21\u5f0f<\/h4>\n\n\n<pre class=\"wp-block-code\"><code>ioctl(fd, SPI_IOC_WR_MODE, &amp;mode)\n<\/code><\/pre>\n\n\n<p>\u4f7f\u7528<code>ioctl()<\/code>\u51fd\u6570\u548c<code>SPI_IOC_WR_MODE<\/code>\u8bf7\u6c42\u6765\u8bbe\u7f6eSPI\u7684\u4f20\u8f93\u6a21\u5f0f\u3002\u6211\u4eec\u9009\u62e9\u7684\u662f<code>SPI_MODE_0<\/code>\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u53ef\u4f7f\u7528<code>SPI_MODE_1<\/code>\u3001<code>SPI_MODE_2<\/code>\u3001<code>SPI_MODE_3<\/code>\u3002<\/p>\n\n\n<h4 class=\"wp-block-heading\">4.5.3 \u8bbe\u7f6eSPI\u5b57\u7684\u4f4d\u6570<\/h4>\n\n\n<pre class=\"wp-block-code\"><code>ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &amp;bits)\n<\/code><\/pre>\n\n\n<p>\u8fd9\u91cc\uff0c\u4f7f\u7528<code>ioctl()<\/code>\u51fd\u6570\u548c<code>SPI_IOC_WR_BITS_PER_WORD<\/code>\u8bf7\u6c42\u6765\u8bbe\u7f6e\u6bcf\u4e2aSPI\u5b57\u7684\u4f4d\u6570\uff0c\u8fd9\u91cc\u8bbe\u4e3a8\u4f4d\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.6 \u8bbe\u7f6eSPI\u6700\u5927\u4f20\u8f93\u901f\u5ea6<\/h3>\n\n\n<pre class=\"wp-block-code\"><code>ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &amp;speed)\n<\/code><\/pre>\n\n\n<p>\u6700\u540e\uff0c\u8bbe\u7f6eSPI\u7684\u6700\u5927\u4f20\u8f93\u901f\u5ea6\u4e3a100,000 Hz\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">5 \u7f16\u5199spidev\u901a\u8baf\u7a0b\u5e8f\uff08C\/C++\uff09<\/h2>\n\n\n<p>\u901a\u8fc7read\u3001write\u5b9e\u73b0\u534a\u53cc\u5de5\u7684\u901a\u8baf\uff0c\u4f7f\u7528ioctl\u5b9e\u73b0\u5168\u53cc\u5de5\u901a\u8baf\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">5.1 \u534a\u53cc\u5de5spi\u901a\u8baf<\/h3>\n\n\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528spidev\u7684\u7b80\u5355\u793a\u4f8b\u3002\u53ef\u4ee5\u5b9e\u73b0\u534a\u53cc\u5de5\u7684\u8bfb\u5199\u4ee5\u53ca\u5173\u95edspidev\u7684\u901a\u9053\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u6267\u884c\u534a\u53cc\u5de5\u8bfb\u5199\nread(fd, rxbuf, len); \nwrite(fd, txbuf, len);\n\n\/\/\nclose(fd); \/\/\u5173\u95edspidev\u7684\u901a\u8baf\u901a\u9053\u3002\n<\/code><\/pre>\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff0c\u7528\u4e8e\u8bfb\u5199\u6570\u636e\u5230\u4e00\u4e2a\u901a\u7528\u8bbe\u5907\uff08\u901a\u5e38\u662f\u4e00\u4e2aSPI\u8bbe\u5907\uff09\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08fd\uff09\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>read(fd, rxbuf, len);\n<\/code><\/pre>\n\n\n<p><code>read <\/code>\u662f\u4e00\u4e2a\u7cfb\u7edf\u8c03\u7528\uff0c\u7528\u4e8e\u4ece\u6587\u4ef6\uff08\u5728\u8fd9\u4e2a\u60c5\u51b5\u4e0b\u662f\u4e00\u4e2a\u8bbe\u5907\uff09\u8bfb\u53d6\u6570\u636e\u3002<\/p>\n\n\n<p><code>fd<\/code>\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u6807\u8bc6\u4e86\u6211\u4eec\u8981\u64cd\u4f5c\u7684\u6587\u4ef6\u6216\u8bbe\u5907\u3002<\/p>\n\n\n<p><code>rxbuf<\/code> \u662f\u4e00\u4e2a\u7f13\u51b2\u533a\uff08buffer\uff09\uff0c\u7528\u4e8e\u5b58\u50a8\u8bfb\u53d6\u5230\u7684\u6570\u636e\u3002<\/p>\n\n\n<p><code>len<\/code> \u662f\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u3002<\/p>\n\n\n<p>\u5f53\u8fd9\u4e00\u884c\u4ee3\u7801\u6267\u884c\u540e\uff0c<code>rxbuf<\/code> \u5c06\u4f1a\u586b\u5145\u4ece\u6587\u4ef6\u63cf\u8ff0\u7b26<code>fd<\/code> \u8bfb\u53d6\u5230\u7684<code>len<\/code> \u4e2a\u5b57\u8282\u7684\u6570\u636e\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>write(fd, txbuf, len);\n<\/code><\/pre>\n\n\n<p><code>write<\/code> \u662f\u4e00\u4e2a\u7cfb\u7edf\u8c03\u7528\uff0c\u7528\u4e8e\u5411\u6587\u4ef6\uff08\u5728\u8fd9\u4e2a\u60c5\u51b5\u4e0b\u662f\u4e00\u4e2a\u8bbe\u5907\uff09\u5199\u5165\u6570\u636e\u3002<\/p>\n\n\n<p><code>txbuf<\/code> \u662f\u4e00\u4e2a\u7f13\u51b2\u533a\uff0c\u5305\u542b\u6211\u4eec\u60f3\u8981\u5199\u5165\u7684\u6570\u636e\u3002<\/p>\n\n\n<p><code>len<\/code> \u662f\u5199\u5165\u7684\u5b57\u8282\u6570\u3002<\/p>\n\n\n<p>\u5f53\u8fd9\u4e00\u884c\u4ee3\u7801\u6267\u884c\u540e\uff0c<code>txbuf<\/code> \u91cc\u9762\u7684\u6570\u636e\uff08<code>len<\/code> \u5b57\u8282\u6570\uff09\u5c06\u4f1a\u88ab\u5199\u5165\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26 <code>fd<\/code> \u6307\u5411\u7684\u6587\u4ef6\u6216\u8bbe\u5907\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>close(fd);\n<\/code><\/pre>\n\n\n<p>\u8fd9\u4e2a\u8c03\u7528\u7528\u4e8e\u5173\u95ed\u4e4b\u524d\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26 <code>fd<\/code> \u6253\u5f00\u7684\u6587\u4ef6\u6216\u8bbe\u5907\uff0c\u91ca\u653e\u7cfb\u7edf\u8d44\u6e90\u3002<\/p>\n\n\n<p>\u6ce8\u610f\uff1a\u8fd9\u91cc\u662f\u534a\u53cc\u5de5\u64cd\u4f5c\uff0c\u610f\u5473\u7740\u8bfb\u548c\u5199\u662f\u5206\u5f00\u8fdb\u884c\u7684\u3002\u8fd9\u4e0e\u5168\u53cc\u5de5\uff08\u540c\u65f6\u8fdb\u884c\u8bfb\u548c\u5199\uff09\u4e0d\u540c\u3002\u8fd9\u91cc\u5148\u8fdb\u884c\u8bfb\u64cd\u4f5c\uff0c\u7136\u540e\u8fdb\u884c\u5199\u64cd\u4f5c\u3002<\/p>\n\n\n<p>\u7b80\u5355\u6765\u8bf4\uff0c\u8fd9\u6bb5\u4ee3\u7801\u4ece\u4e00\u4e2a\u8bbe\u5907\u8bfb\u53d6\u6570\u636e\uff0c\u7136\u540e\u5199\u5165\u6570\u636e\uff0c\u6700\u540e\u5173\u95ed\u4e0e\u8be5\u8bbe\u5907\u7684\u8fde\u63a5\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">5.2 \u5b9e\u73b0\u5168\u53cc\u5de5spi\u901a\u8baf<\/h3>\n\n\n<p>\u8fd9\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u4f7f\u7528<code>ioctl()<\/code>\u51fd\u6570\u548c<code>SPI_IOC_MESSAGE<\/code>\u8bf7\u6c42\u5b9e\u73b0\u5168\u53cc\u5de5\u7684\u901a\u8baf\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;fcntl.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;sys\/ioctl.h&gt;\n#include &lt;linux\/spi\/spidev.h&gt;\n\n\/\/ \u6267\u884c\u5168\u53cc\u5de5\u8bfb\u5199\u7684\u51fd\u6570\uff0c\u53ef\u88ab\u8c03\u7528\u4ee5\u8fdb\u884cSPI\u901a\u8baf\u3002\nbool SPIDevice::transfer(const uint8_t *tx, uint8_t *rx, size_t len) {\n    struct spi_ioc_transfer tr;\n    memset(&amp;tr, 0, sizeof(tr));\n    tr.tx_buf = (unsigned long)tx;\n    tr.rx_buf = (unsigned long)rx;\n    tr.len = len;\n    tr.delay_usecs = 0;\n    tr.speed_hz = speed;\n    tr.bits_per_word = bits;\n    bool a = (ioctl(fd, SPI_IOC_MESSAGE(1), &amp;tr)==-1);\n    if (a)\n    {\n        std::cout&lt;&lt;\"transfer error\"&lt;&lt;std::endl; \/\/\u5982\u679cioctl()\u8c03\u7528\u8fd4\u56de-1\uff0c\u5219\u8f93\u51fa\u4e00\u4e2a\u9519\u8bef\u6d88\u606f\u3002\n    }\n    return !a;\n}\n<\/code><\/pre>\n\n\n<p>\u5176\u4e2d\u7528\u5230\u4e86<code>SPI_IOC_MESSAGE<\/code>\uff0c\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684<code>ioctl()<\/code>\u8bf7\u6c42\uff0c\u7528\u4e8e\u6267\u884c\u5b9e\u9645\u7684SPI\u6570\u636e\u4f20\u8f93\u3002\u8be5\u547d\u4ee4\u5141\u8bb8\u5e94\u7528\u7a0b\u5e8f\u5728\u5355\u4e2a\u8c03\u7528\u4e2d\u6267\u884c\u4e00\u4e2a\u6216\u591a\u4e2aSPI\u6d88\u606f\u7684\u5b8c\u6574\u4f20\u8f93\u3002<\/p>\n\n\n<p>\u53c2\u6570\u7ed3\u6784\uff1a<code>spi_ioc_transfer<\/code><\/p>\n\n\n<p>\u8be5\u547d\u4ee4\u901a\u5e38\u4e0e\u4e00\u4e2a\u6216\u591a\u4e2a<code>spi_ioc_transfer<\/code>\u7ed3\u6784\u4f53\u4e00\u540c\u4f7f\u7528\u3002\u6bcf\u4e2a<code>spi_ioc_transfer<\/code>\u7ed3\u6784\u4f53\u90fd\u63cf\u8ff0\u4e86\u4e00\u4e2a\u72ec\u7acb\u7684SPI\u4f20\u8f93\u6d88\u606f\uff0c\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u91cd\u8981\u7684\u5b57\u6bb5\uff1a<\/p>\n\n\n<p><code>tx_buf<\/code>\uff1a\u6307\u5411\u5f85\u53d1\u9001\u6570\u636e\u7684\u7f13\u51b2\u533a\u3002<\/p>\n\n\n<p><code>rx_buf<\/code>\uff1a\u6307\u5411\u7528\u4e8e\u63a5\u6536\u6570\u636e\u7684\u7f13\u51b2\u533a\u3002<\/p>\n\n\n<p><code>len<\/code>\uff1a\u4f20\u8f93\u7684\u5b57\u8282\u6570\u3002<\/p>\n\n\n<p><code>speed_hz<\/code>\uff1a\u4f20\u8f93\u901f\u7387\u3002<\/p>\n\n\n<p><code>bits_per_word<\/code>\uff1a\u6bcf\u4e2a\u6570\u636e\u5b57\u7684\u4f4d\u6570\u3002<\/p>\n\n\n<p><code>delay_usecs<\/code>\uff1a\u4f20\u8f93\u5b8c\u6210\u540e\u7684\u5ef6\u8fdf\u65f6\u95f4\uff0c\u5355\u4f4d\u4e3a\u5fae\u79d2\u3002<\/p>\n\n\n<p>\u5728\u4f7f\u7528<code>ioctl()<\/code>\u8fdb\u884cSPI\u4f20\u8f93\u65f6\uff0c\u901a\u5e38\u4f1a\u50cf\u4e0b\u9762\u8fd9\u6837\u8c03\u7528\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>struct spi_ioc_transfer tr;\n\/\/ \u521d\u59cb\u5316 tr \u7ed3\u6784\u4f53...\nint ret = ioctl(fd, SPI_IOC_MESSAGE(1), &amp;tr);\n<\/code><\/pre>\n\n\n<p>\u5176\u4e2d\uff0c<code>fd<\/code>\u662f\u5df2\u6253\u5f00\u7684SPI\u8bbe\u5907\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c<code>SPI_IOC_MESSAGE(1)<\/code>\u6307\u793a\u6211\u4eec\u5c06\u8fdb\u884c\u4e00\u4e2aSPI\u6d88\u606f\u7684\u4f20\u8f93\uff0c<code>&amp;tr<\/code>\u662f\u6307\u5411\u5df2\u521d\u59cb\u5316\u7684<code>spi_ioc_transfer<\/code>\u7ed3\u6784\u4f53\u7684\u6307\u9488\u3002<\/p>\n\n\n<p>\u6267\u884c\u591a\u4e2aSPI\u4f20\u8f93<\/p>\n\n\n<p><code>SPI_IOC_MESSAGE<\/code>\u4e5f\u652f\u6301\u4e00\u6b21\u6267\u884c\u591a\u4e2aSPI\u4f20\u8f93\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u4e00\u4e2a<code>spi_ioc_transfer<\/code>\u6570\u7ec4\uff0c\u4f60\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>struct spi_ioc_transfer trs&#91;2];\n\/\/ \u521d\u59cb\u5316 trs \u6570\u7ec4...\nint ret = ioctl(fd, SPI_IOC_MESSAGE(2), trs);\n<\/code><\/pre>\n\n\n<p>\u8fd9\u6837\uff0c<code>trs<\/code>\u6570\u7ec4\u4e2d\u7684\u4e24\u4e2a<code>spi_ioc_transfer<\/code>\u7ed3\u6784\u4f53\u4f1a\u88ab\u4f9d\u6b21\u7528\u4e8eSPI\u6570\u636e\u4f20\u8f93\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">5.3 \u5c0f\u7ed3<\/h3>\n\n\n<p>\u4e0a\u6587\u4e3b\u8981\u8bb2\u8ff0\u4e86\u5982\u4f55\u5728C\/C++\u4e2d\u4f7f\u7528spidev\u5e93\u5b9e\u73b0SPI\uff08Serial Peripheral Interface\uff09\u901a\u4fe1\u3002\u6587\u7ae0\u9996\u5148\u4ecb\u7ecd\u4e86\u5982\u4f55\u8fdb\u884c\u534a\u53cc\u5de5\u901a\u4fe1\uff0c\u7136\u540e\u8be6\u7ec6\u89e3\u91ca\u4e86\u5982\u4f55\u4f7f\u7528<code>ioctl()<\/code>\u51fd\u6570\u5b9e\u73b0\u5168\u53cc\u5de5\u901a\u4fe1\u3002<\/p>\n\n\n<p>\uff081\uff09<strong>\u534a\u53cc\u5de5SPI\u901a\u4fe1<\/strong>\uff1a<\/p>\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528<code>read()<\/code>\u548c<code>write()<\/code>\u51fd\u6570\u8fdb\u884c\u6570\u636e\u7684\u8bfb\u53d6\u548c\u5199\u5165\u3002<\/li>\n\n\n\n<li>\u6700\u540e\u901a\u8fc7<code>close(fd)<\/code>\u6765\u5173\u95edSPI\u7684\u901a\u4fe1\u901a\u9053\u3002<br><\/li>\n<\/ul>\n\n\n<p>\uff082\uff09<strong>\u5168\u53cc\u5de5SPI\u901a\u4fe1<\/strong>\uff1a<\/p>\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528<code>ioctl()<\/code>\u548c\u7279\u5b9a\u7684\u8bf7\u6c42<code>SPI_IOC_MESSAGE<\/code>\u6765\u8fdb\u884c\u5168\u53cc\u5de5\u901a\u4fe1\u3002<\/li>\n\n\n\n<li>\u5177\u4f53\u901a\u8fc7\u4e00\u4e2a\u540d\u4e3a<code>SPIDevice::transfer<\/code>\u7684\u51fd\u6570\u6765\u5b9e\u73b0\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u4e86<code>spi_ioc_transfer<\/code>\u7ed3\u6784\u4f53\u6765\u63cf\u8ff0SPI\u4f20\u8f93\u7684\u5404\u4e2a\u53c2\u6570\uff0c\u5982\u5f85\u53d1\u9001\u548c\u63a5\u6536\u7684\u6570\u636e\u7f13\u51b2\u533a\u3001\u4f20\u8f93\u5b57\u8282\u6570\u3001\u901f\u5ea6\u7b49\u3002<br><\/li>\n<\/ul>\n\n\n<p>\uff083\uff09<strong>\u591a\u6d88\u606fSPI\u4f20\u8f93<\/strong>\uff1a<\/p>\n\n\n<ul class=\"wp-block-list\">\n<li><code>SPI_IOC_MESSAGE<\/code>\u4e5f\u652f\u6301\u4e00\u6b21\u6267\u884c\u591a\u4e2aSPI\u4f20\u8f93\uff0c\u901a\u8fc7\u6784\u5efa\u4e00\u4e2a<code>spi_ioc_transfer<\/code>\u7ed3\u6784\u4f53\u6570\u7ec4\u6765\u5b9e\u73b0\u3002<br><\/li>\n<\/ul>\n\n\n<p>\u6587\u7ae0\u8fd8\u6df1\u5165\u4ecb\u7ecd\u4e86<code>spi_ioc_transfer<\/code>\u7ed3\u6784\u4f53\u7684\u5404\u4e2a\u5b57\u6bb5\u548c\u5b83\u4eec\u7684\u610f\u4e49\uff0c\u4fbf\u4e8e\u7406\u89e3\u5e76\u5b9e\u73b0\u57fa\u4e8espidev\u7684SPI\u901a\u4fe1\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">6 \u603b\u7ed3<\/h2>\n\n\n<p>\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u6df1\u5165\u63a2\u8ba8\u4e86spidev\u2014\u2014Linux\u5185\u6838\u4e2d\u7684\u7528\u6237\u7a7a\u95f4SPI\u63a5\u53e3\u3002\u6211\u4eec\u4e86\u89e3\u5230\uff0cspidev\u4f5c\u4e3a\u4e00\u4e2a\u6865\u6881\uff0c\u8fde\u63a5\u4e86\u7528\u6237\u7a0b\u5e8f\u4e0e\u5185\u6838\u7a7a\u95f4SPI\u6838\u5fc3\u5e95\u5c42\u9a71\u52a8\uff0c\u4f7f\u5f97\u5f00\u53d1\u8005\u53ef\u4ee5\u76f4\u63a5\u5728\u7528\u6237\u7a7a\u95f4\u8fdb\u884c\u7a0b\u5e8f\u5f00\u53d1\u4ee5\u8c03\u7528\u5e95\u5c42SPI\u9a71\u52a8\uff0c\u5927\u5927\u964d\u4f4e\u4e86SPI\u9a71\u52a8\u5f00\u53d1\u7684\u95e8\u69db\u3002<\/p>\n\n\n<p>\u540c\u65f6\uff0c\u6211\u4eec\u4e5f\u4e86\u89e3\u5230\uff0c\u867d\u7136spidev\u63d0\u4f9b\u4e86\u4e00\u4e2a\u76f8\u5bf9\u7b80\u4fbf\u7684\u65b9\u5f0f\u6765\u8bbf\u95eeSPI\u8bbe\u5907\uff0c\u4f46\u5728\u9700\u8981\u8bbf\u95ee\u5185\u6838\u7a7a\u95f4\u7684\u9ad8\u7ea7\u63a5\u53e3\u529f\u80fd\u65f6\uff0c\u5982\u4e2d\u65ad\u5904\u7406\u7b49\uff0cspidev\u5c31\u663e\u5f97\u529b\u4e0d\u4ece\u5fc3\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5f00\u53d1\u8005\u5e94\u5f53\u8003\u8651\u76f4\u63a5\u5728\u5185\u6838\u7a7a\u95f4\u5f00\u53d1SPI\u9a71\u52a8\u7a0b\u5e8f\u3002<\/p>\n\n\n<p>\u6b64\u5916\uff0c\u6211\u4eec\u8fd8\u4ecb\u7ecd\u4e86\u5982\u4f55\u5728openwrt\u7cfb\u7edf\u4e2d\u542f\u7528spidev\u6a21\u5757\uff0c\u5305\u62ec\u914d\u7f6e\u5e76\u7f16\u8bd1\u6e90\u4ee3\u7801\u7684\u65b9\u6cd5\uff0c\u4ee5\u53ca\u5b89\u88c5spidev\u5305\u7684\u65b9\u6cd5\u3002\u6211\u4eec\u8fd8\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5982\u4f55\u4f7f\u7528ioctl()\u51fd\u6570\u6765\u4e0eSPI\u8bbe\u5907\u8fdb\u884c\u4ea4\u4e92\uff0c\u4ee5\u53ca\u5982\u4f55\u8bbe\u7f6eSPI\u901a\u8baf\u7684\u53c2\u6570\u3002<\/p>\n\n\n<p>\u6700\u540e\uff0c\u901a\u8fc7C\/C++\u793a\u4f8b\u7a0b\u5e8f\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528spidev\u5e93\u548cioctl()\u51fd\u6570\u6765\u521d\u59cb\u5316SPI\u8bbe\u5907\u5e76\u8fdb\u884c\u901a\u8baf\u3002<\/p>\n\n\n<p>\u603b\u7684\u6765\u8bf4\uff0cspidev\u662f\u4e00\u4e2a\u5f3a\u5927\u800c\u7075\u6d3b\u7684\u5de5\u5177\uff0c\u5b83\u4e3a\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7b80\u5355\u800c\u76f4\u63a5\u7684\u65b9\u5f0f\u6765\u8bbf\u95ee\u548c\u63a7\u5236SPI\u8bbe\u5907\u3002\u65e0\u8bba\u4f60\u662f\u4e00\u4e2a\u7ecf\u9a8c\u4e30\u5bcc\u7684\u5185\u6838\u5f00\u53d1\u8005\uff0c\u8fd8\u662f\u4e00\u4e2a\u521a\u521a\u5f00\u59cb\u63a5\u89e6SPI\u7f16\u7a0b\u7684\u65b0\u624b\uff0c\u76f8\u4fe1\u4f60\u90fd\u80fd\u4ece\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u627e\u5230\u6709\u7528\u7684\u4fe1\u606f\u548c\u542f\u53d1\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">\u53c2\u8003\u8d44\u6599<\/h2>\n\n\n<p>[1]  <a href=\"https:\/\/www.kernel.org\/doc\/Documentation\/spi\/spidev\" title=\"spidev\u5b98\u7f51\u6587\u6863\">https:\/\/www.kernel.org\/doc\/Documentation\/spi\/spidev<\/a><\/p>\n\n\n<p>[2] <a href=\"#\">https:\/\/blog.csdn.net\/chinazhangzhong123\/article\/details\/54707387<\/a><\/p>\n\n\n<p>[3] <a href=\"#\">https:\/\/juejin.cn\/post\/7153440681615163423<\/a><\/p>\n\n\n<p>[4] <a href=\"#\">https:\/\/blog.csdn.net\/qq_37037348\/article\/details\/130564284<\/a><\/p>\n\n\n<p>[5] <a href=\"#\">https:\/\/blog.csdn.net\/yangguoyu8023\/article\/details\/122636162<\/a><\/p>\n\n\n<p>[6] <a href=\"#\">https:\/\/blog.csdn.net\/u011006622\/article\/details\/124102680<\/a><\/p>\n\n\n<p>[7] <a href=\"#\">https:\/\/www.cnblogs.com\/panda-w\/p\/11137887.html<\/a><\/p>\n\n\n<p>[8] <a href=\"#\">https:\/\/wiki.t-firefly.com\/AIO-3399ProC\/driver_spi.html<\/a><\/p>\n\n\n<p>[9] <a href=\"#\">https:\/\/www.eet-china.com\/mp\/a209080.html<\/a><\/p>\n\n\n<p>[10] <a href=\"#\">http:\/\/www.linkedkeeper.com\/mobile\/1410.html<\/a><\/p>\n\n\n<p>[11] <a href=\"#\">https:\/\/wiki.t-firefly.com\/zh_CN\/AIO-3128C\/driver_spi.html<\/a><\/p>\n\n\n<p>[12] <a href=\"#\">https:\/\/blog.csdn.net\/jia_weihui\/article\/details\/129239470<\/a><\/p>\n\n\n<p>[13] <a href=\"#\">https:\/\/jb51.net\/article\/186517.htm<\/a><\/p>\n\n\n<p>[14] <a href=\"#\">https:\/\/doc.embedfire.com\/linux\/imx6\/quick_start\/zh\/latest\/quick_start\/spi_bus\/spi_bus.html<\/a><\/p>\n\n\n<p>[15] <a href=\"#\">https:\/\/elecfans.com\/article\/2052674.html<\/a><\/p>\n\n\n<p>[16] <a href=\"#\">https:\/\/e2echina.ti.com\/support\/microcontrollers\/msp430\/f\/msp-low-power-microcontroller-forum\/206161\/msp430fr2433-spi<\/a><\/p>\n\n\n<p>[17] <a href=\"#\">http:\/\/xilinx.eetrend.com\/d6-xilinx\/blog\/2017-02\/10922.html<\/a><\/p>\n\n\n<p>[18] <a href=\"#\">https:\/\/wiki.phytec.com\/plugins\/servlet\/mobile?contentId=158152813<\/a><\/p>\n\n\n<p>[19] <a href=\"#\">https:\/\/community.infineon.com\/t5\/USB-EZ-PD-Type-C\/\u5728-SPI-MOSI-\u548c-MISO-\u4e0a\u53d1\u9001\u548c\u63a5\u6536\u5b57\u8282\u7684\u793a\u4f8b\u4ee3\u7801\/td-p\/623509<\/a><\/p>\n\n\n<p>[20] <a href=\"#\">https:\/\/wx.comake.online\/doc\/doc\/SigmaStarDocs-Pudding-0120\/customer\/development\/reference\/spi dev.html<\/a><\/p>\n\n\n<p>[21] <a href=\"#\">https:\/\/hackmd.io\/@amberchung\/linux-spidev<\/a><\/p>\n\n\n<p>[22] <a href=\"#\">https:\/\/github.com\/apache\/dubbo-website\/issues\/575<\/a><\/p>\n\n\n<p>[23] <a href=\"#\">https:\/\/wiki.sipeed.com\/soft\/maixpy3\/zh\/usage\/hardware\/SPI.html<\/a><\/p>\n\n\n<h2 class=\"wp-block-heading\">\u9644\u5f55<\/h2>\n\n\n<h3 class=\"wp-block-heading\">mt7628.dts \u6587\u4ef6<\/h3>\n\n\n<pre class=\"wp-block-code\"><code>\/dts-v1\/;\n\n\/include\/ \"mt7628an.dtsi\"\n\n\/ {\n    compatible = \"mediatek,mt7628an-eval-board\", \"mediatek,mt7628an-soc\";\n    model = \"Mediatek MT7628AN evaluation board\";\n\n        chosen {\n                bootargs = \"console=ttyS0,115200\";\n        };\n\n    memory@0 {\n        device_type = \"memory\";\n        reg = &lt;0x0 0x10000000&gt;; \/\/256MB RAM\n    \/\/  reg = &lt;0x0 0x8000000&gt;; \/\/128MB RAM\n    \/\/  reg = &lt;0x0 0x4000000&gt;; \/\/64MB RAM\n    };\n\n    pinctrl {\n        state_default: pinctrl0 {\n            gpio {\n        \/\/      ralink,group = \"i2c\";\n        \/\/      ralink,function = \"gpio\";\n            };\n            p0_led {\n                ralink,group = \"p0_led_an\";\n                ralink,function = \"ephy\";\n            };\n            p1_led {\n                ralink,group = \"p1_led_an\";\n                ralink,function = \"ephy\";\n            };\n            p2_led {\n                ralink,group = \"p2_led_an\";\n                ralink,function = \"ephy\";\n            };\n            p3_led {\n                ralink,group = \"p3_led_an\";\n                ralink,function = \"gpio\";\n            };\n            p4_led {\n                ralink,group = \"p4_led_an\";\n                ralink,function = \"gpio\";\n            };\n            spis {\n                ralink,group = \"spis\";\n                ralink,function = \"spis\";\n            };\n                        pwm1 {\n                                ralink,group = \"pwm1\";\n                                ralink,function = \"gpio\";\n                        };\n                        pwm0 {\n                                ralink,group = \"pwm0\";\n                                ralink,function = \"gpio\";\n                        };\n\n            refclk {\n                ralink,group = \"refclk\";\n                ralink,function = \"gpio\";\n            };\n            gpio_0 {\n                ralink,group = \"gpio\";\n\/\/              ralink,function = \"refclk_fc\";\n                ralink,function = \"gpio\";\n            };\n                        i2s {\n                                ralink,group = \"i2s\";\n                                ralink,function = \"i2s\";\n                        };\n\n        };\n\n            uart2_pins: uart2 {\n                uart2 {\n                        ralink,group = \"uart2\";\n                            ralink,function = \"gpio\";\n                         };\n        };\n\n    };\n\n    palmbus@10000000 {\n                i2c@900 {\n                        status = \"okay\";\n                };\n\n        spi@b00 {\n            status = \"okay\";\n\n            m25p80@0 {\n                #address-cells = &lt;1&gt;;\n                #size-cells = &lt;1&gt;;\n                compatible = \"en25q64\";\n                reg = &lt;0 0&gt;;\n                linux,modalias = \"w25q64\", \"w25q128\", \"w25q256\";\n                spi-max-frequency = &lt;10000000&gt;;\n                m25p,chunked-io = &lt;32&gt;;\n\n                partition@0 {\n                    label = \"u-boot\";\n                    reg = &lt;0x0 0x30000&gt;;\n                    read-only;\n                };\n\n                partition@30000 {\n                    label = \"u-boot-env\";\n                    reg = &lt;0x30000 0x10000&gt;;\n                    read-only;\n                };\n\n                factory: partition@40000 {\n                    label = \"factory\";\n                    reg = &lt;0x40000 0x10000&gt;;\n                    read-only;\n                };\n\n                partition@50000 {\n                    label = \"firmware\";\n                \/\/  reg = &lt;0x50000 0x7b0000&gt;; \/\/8MB flash\n                \/\/  reg = &lt;0x50000 0xfb0000&gt;; \/\/16MB flash\n                    reg = &lt;0x50000 0x1fb0000&gt;; \/\/32MB flash\n                };\n            };\n            spidev@1{\n                compatible = \"spidev\", \"rohm,dh2228fv\";\n                reg = &lt;1 0&gt;;\n                spi-max-frequency = &lt;10000000&gt;;\n            };\n        };\n                uart1@d00 {\n                        status = \"okay\";\n                };\n\n                uart2@e00 {\n                        status = \"okay\";\n                };\n\n    };\n        sdhci@10130000 {\n                status = \"okay\";\n                mediatek,cd-low;\n        };\n\n        ethernet@10100000 {\n                mtd-mac-address = &lt;&amp;factory 0x28&gt;;\n        };\n\n        gpio-leds {\n                compatible = \"gpio-leds\";\n\n        system {\n                        label = \"mediatek:green:system\";\n                        gpios = &lt;&amp;gpio1 5 1&gt;;\n                        default-state = \"off\";\n                };\n\n                wifi {\n                        label = \"mediatek:green:wifi\";\n                        gpios = &lt;&amp;gpio1 12 1&gt;;\n                        default-state = \"off\";\n                };\n        };\n\n        gpio-keys-polled {\n                compatible = \"gpio-keys-polled\";\n                #address-cells = &lt;1&gt;;\n                #size-cells = &lt;0&gt;;\n                poll-interval = &lt;20&gt;;\n\n                button_1 {\n                        label = \"button_1\";\n                        gpios = &lt;&amp;gpio1 6 0&gt;;\n                        linux,code = &lt;0x101&gt;;\n                };\n                button_2{\n                        label = \"button_2\";\n                        gpios = &lt;&amp;gpio1 8 0&gt;;\n                        linux,code = &lt;0x102&gt;;\n                };\n        };  \n};\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u64b0\u5199\u65f6\u95f4\uff1a2023\/10\/24 1 \u7b80\u4ecb 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