{"id":511,"date":"2022-05-23T18:10:31","date_gmt":"2022-05-23T10:10:31","guid":{"rendered":"https:\/\/usei.cn\/?p=511"},"modified":"2022-05-23T18:10:32","modified_gmt":"2022-05-23T10:10:32","slug":"%e7%a1%ac%e4%bb%b6%e9%80%9a%e8%ae%af%e5%8d%8f%e8%ae%ae-i2c-%e5%8d%8f%e8%ae%ae","status":"publish","type":"post","link":"https:\/\/usei.cn\/index.php\/2022\/05\/23\/%e7%a1%ac%e4%bb%b6%e9%80%9a%e8%ae%af%e5%8d%8f%e8%ae%ae-i2c-%e5%8d%8f%e8%ae%ae\/","title":{"rendered":"\u786c\u4ef6\u901a\u8baf\u534f\u8bae \u2013 I2C \u534f\u8bae"},"content":{"rendered":"\n

I2C\u603b\u7ebf\u662f\u7531Philips\u516c\u53f8\u5f00\u53d1\u7684\u4e00\u79cd\u7b80\u5355\u3001\u53cc\u5411\u4e8c\u7ebf\u5236\u540c\u6b65\u4e32\u884c\u603b\u7ebf<\/strong>\u3002\u5b83\u53ea\u9700\u8981\u4e24\u6839\u7ebf\u5373\u53ef\u4f20\u9001\u4fe1\u606f\u3002\u5b83\u7ed3\u5408\u4e86 SPI \u548c UART \u7684\u4f18\u70b9\uff0c\u53ef\u4ee5\u5c06\u591a\u4e2a\u4ece\u673a\u8fde\u63a5\u5230\u5355\u4e2a\u4e3b\u673a\uff08\u5982SPI\u90a3\u6837\uff09\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u591a\u4e2a\u4e3b\u673a\u63a7\u5236\u4e00\u4e2a\u6216\u591a\u4e2a\u4ece\u673a\u3002\u5f53\u60f3\u8ba9\u591a\u4e2a\u5fae\u63a7\u5236\u5668\u5c06\u6570\u636e\u8bb0\u5f55\u5230\u5355\u4e2a\u5b58\u50a8\u5361\u6216\u5c06\u6587\u672c\u663e\u793a\u5230\u5355\u4e2aLCD\u65f6\uff0c\u8fd9\u5c06\u975e\u5e38\u6709\u7528\u3002<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

SDA (Serial Data) \u2013 \u6570\u636e\u7ebf\u3002<\/p>\n\n\n\n

SCL (Serial Clock) \u2013 \u65f6\u949f\u7ebf\u3002<\/p>\n\n\n\n

I2C\u662f\u4e32\u884c\u901a\u4fe1\u534f\u8bae\uff0c\u56e0\u6b64\u6570\u636e\u6cbf\u7740SDA\u4e00\u70b9\u4e00\u70b9\u5730\u4f20\u8f93\u3002\u4e0eSPI\u4e00\u6837\uff0cI2C\u4e5f\u9700\u8981\u65f6\u949f\u540c\u6b65\u4fe1\u53f7\u4e14\u65f6\u949f\u59cb\u7ec8\u7531\u4e3b\u673a\u63a7\u5236\u3002<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

\u5de5\u4f5c\u539f\u7406<\/strong><\/p>\n\n\n\n

I2C\u7684\u6570\u636e\u4f20\u8f93\u662f\u4ee5\u591a\u4e2amsg\u7684\u5f62\u5f0f\u8fdb\u884c\uff0c\u6bcf\u4e2amsg\u90fd\u5305\u542b\u4ece\u673a\u7684\u4e8c\u8fdb\u5236\u5730\u5740\u5e27<\/strong>\uff0c\u4ee5\u53ca\u4e00\u4e2a\u6216\u591a\u4e2a\u6570\u636e\u5e27<\/strong>\uff0c\u8fd8\u5305\u62ec\u5f00\u59cb\u6761\u4ef6\u548c\u505c\u6b62\u6761\u4ef6\uff0c\u8bfb\/\u5199\u4f4d\u548c\u6570\u636e\u5e27\u4e4b\u95f4\u7684ACK \/ NACK\u4f4d\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

\u542f\u52a8\u6761\u4ef6\uff1a\u5f53SCL\u662f\u9ad8\u7535\u5e73\u65f6\uff0cSDA\u4ece\u9ad8\u7535\u5e73\u5411\u4f4e\u7535\u5e73\u5207\u6362\u3002<\/p>\n\n\n\n

\u505c\u6b62\u6761\u4ef6\uff1a\u5f53SCL\u662f\u9ad8\u7535\u5e73\u65f6\uff0cSDA\u7531\u4f4e\u7535\u5e73\u5411\u9ad8\u7535\u5e73\u5207\u6362\u3002<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

\u5730\u5740\u5e27\uff1a\u6bcf\u4e2a\u4ece\u5c5e\u8bbe\u5907\u552f\u4e00\u76847\u4f4d\u621610\u4f4d\u5e8f\u5217\uff0c\u7528\u4e8e\u4e3b\u4ece\u8bbe\u5907\u4e4b\u95f4\u7684\u5730\u5740\u8bc6\u522b\u3002<\/p>\n\n\n\n

\u8bfb\/\u5199\u4f4d\uff1a\u4e00\u4f4d\uff0c\u5982\u679c\u4e3b\u673a\u662f\u5411\u4ece\u673a\u53d1\u9001\u6570\u636e\u5219\u4e3a\u4f4e\u7535\u5e73\uff0c\u8bf7\u6c42\u6570\u636e\u5219\u4e3a\u9ad8\u7535\u5e73\u3002<\/p>\n\n\n\n

ACK\/NACK\uff1a\u6d88\u606f\u4e2d\u7684\u6bcf\u4e2a\u5e27\u540e\u5747\u5e26\u6709\u4e00\u4e2aACK\/NACK\u4f4d\u3002\u5982\u679c\u6210\u529f\u63a5\u6536\u5230\u5730\u5740\u5e27\u6216\u6570\u636e\u5e27\uff0c\u63a5\u6536\u8bbe\u5907\u4f1a\u8fd4\u56de\u4e00\u4e2aACK\u4f4d\u7528\u4e8e\u8868\u793a\u786e\u8ba4\u3002<\/p>\n\n\n\n

\u5bfb\u5740<\/strong><\/p>\n\n\n\n

\u7531\u4e8eI2C\u6ca1\u6709\u50cfSPI\u90a3\u6837\u7684\u7247\u9009\u7ebf\uff0c\u56e0\u6b64\u5b83\u9700\u8981\u4f7f\u7528\u53e6\u4e00\u79cd\u65b9\u5f0f\u6765\u786e\u8ba4\u67d0\u4e00\u4e2a\u4ece\u8bbe\u5907\uff0c\u800c\u8fd9\u4e2a\u65b9\u5f0f\u5c31\u662f \u2014\u2014 \u5bfb\u5740 \u3002<\/p>\n\n\n\n

\u4e3b\u673a\u5c06\u8981\u901a\u4fe1\u7684\u4ece\u673a\u5730\u5740\u53d1\u9001\u7ed9\u6bcf\u4e2a\u4ece\u673a\uff0c\u7136\u540e\u6bcf\u4e2a\u4ece\u673a\u5c06\u5176\u4e0e\u81ea\u5df1\u7684\u5730\u5740\u8fdb\u884c\u6bd4\u8f83\u3002\u5982\u679c\u5730\u5740\u5339\u914d\uff0c\u5b83\u5c06\u5411\u4e3b\u673a\u53d1\u9001\u4e00\u4e2a\u4f4e\u7535\u5e73ACK\u4f4d\u3002\u5982\u679c\u4e0d\u5339\u914d\uff0c\u5219\u4e0d\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\uff0cSDA\u7ebf\u4fdd\u6301\u9ad8\u7535\u5e73\u3002<\/p>\n\n\n\n

\u8bfb\/\u5199\u4f4d<\/strong><\/p>\n\n\n\n

\u5730\u5740\u5e27\u7684\u672b\u5c3e\u5305\u542b\u4e00\u4e2a\u8bfb\/\u5199\u4f4d\u3002\u5982\u679c\u4e3b\u673a\u8981\u5411\u4ece\u673a\u53d1\u9001\u6570\u636e\uff0c\u5219\u4e3a\u4f4e\u7535\u5e73\u3002\u5982\u679c\u662f\u4e3b\u673a\u5411\u4ece\u673a\u8bf7\u6c42\u6570\u636e\uff0c\u5219\u4e3a\u9ad8\u7535\u5e73\u3002<\/p>\n\n\n\n

\u6570\u636e\u5e27<\/strong><\/p>\n\n\n\n

\u5f53\u4e3b\u673a\u68c0\u6d4b\u5230\u4ece\u673a\u7684ACK\u4f4d\u540e\uff0c\u5c31\u53ef\u4ee5\u53d1\u9001\u7b2c\u4e00\u4e2a\u6570\u636e\u5e27\u4e86\u3002\u6570\u636e\u5e27\u59cb\u7ec8\u4e3a8\u4f4d\uff0c\u6bcf\u4e2a\u6570\u636e\u5e27\u540e\u7d27\u8ddf\u4e00\u4e2aACK \/ NACK\u4f4d\uff0c\u6765\u9a8c\u8bc1\u63a5\u6536\u72b6\u6001\u3002\u5f53\u53d1\u9001\u5b8c\u6240\u6709\u6570\u636e\u5e27\u540e\uff0c\u4e3b\u673a\u53ef\u4ee5\u5411\u4ece\u673a\u53d1\u9001\u505c\u6b62\u6761\u4ef6\u6765\u7ec8\u6b62\u901a\u4fe1\u3002<\/p>\n\n\n\n

\u4f20\u8f93\u6b65\u9aa4<\/strong><\/p>\n\n\n\n

1. \u5728SCL\u7ebf\u4e3a\u9ad8\u7535\u5e73\u65f6\uff0c\u4e3b\u673a\u901a\u8fc7\u5c06SDA\u7ebf\u4ece\u9ad8\u7535\u5e73\u5207\u6362\u5230\u4f4e\u7535\u5e73\u6765\u542f\u52a8\u603b\u7ebf\u901a\u4fe1\u3002<\/p>\n\n\n\n

2. \u4e3b\u673a\u5411\u603b\u7ebf\u53d1\u9001\u8981\u4e0e\u4e4b\u901a\u4fe1\u7684\u4ece\u673a\u76847\u4f4d\u621610\u4f4d\u5730\u5740\uff0c\u4ee5\u53ca\u8bfb\/\u5199\u4f4d\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

3. \u6bcf\u4e2a\u4ece\u673a\u5c06\u4e3b\u673a\u53d1\u9001\u7684\u5730\u5740\u4e0e\u5176\u81ea\u5df1\u7684\u5730\u5740\u8fdb\u884c\u6bd4\u8f83\u3002\u5982\u679c\u5730\u5740\u5339\u914d\uff0c\u5219\u4ece\u673a\u901a\u8fc7\u5c06SDA\u7ebf\u62c9\u4f4e\u4e00\u4f4d\u8fd4\u56de\u4e00\u4e2aACK\u4f4d\u3002\u5982\u679c\u4e3b\u673a\u7684\u5730\u5740\u4e0e\u4ece\u673a\u7684\u5730\u5740\u4e0d\u5339\u914d\uff0c\u5219\u4ece\u673a\u5c06SDA\u7ebf\u62c9\u9ad8\u3002<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

4. \u4e3b\u673a\u53d1\u9001\u6216\u63a5\u6536\u6570\u636e\u5e27\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

5. \u4f20\u8f93\u5b8c\u6bcf\u4e2a\u6570\u636e\u5e27\u540e\uff0c\u63a5\u6536\u8bbe\u5907\u5c06\u53e6\u4e00\u4e2aACK\u4f4d\u8fd4\u56de\u7ed9\u53d1\u9001\u65b9\uff0c\u4ee5\u786e\u8ba4\u5df2\u6210\u529f\u63a5\u6536\u5230\u8be5\u5e27\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

6. \u968f\u540e\u4e3b\u673a\u5c06SCL\u5207\u6362\u4e3a\u9ad8\u7535\u5e73\uff0c\u7136\u540e\u518d\u5c06SDA\u5207\u6362\u4e3a\u9ad8\u7535\u5e73\uff0c\u4ece\u800c\u5411\u4ece\u673a\u53d1\u9001\u505c\u6b62\u6761\u4ef6\u3002<\/p>\n\n\n\n

\u5355\u4e2a\u4e3b\u673aVS\u591a\u4e2a\u4ece\u673a<\/strong><\/p>\n\n\n\n

\u7531\u4e8eI2C\u4f7f\u7528\u5bfb\u5740\u529f\u80fd\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2a\u4e3b\u673a\u63a7\u5236\u591a\u4e2a\u4ece\u673a\u3002\u4f7f\u75287\u4f4d\u5730\u5740\u65f6\uff0c\u6700\u591a\u53ef\u4ee5\u4f7f\u7528128(27)\u4e2a\u552f\u4e00\u5730\u5740\u3002\u4f7f\u752810\u4f4d\u5730\u5740\u5e76\u4e0d\u5e38\u89c1\uff0c\u4f46\u53ef\u4ee5\u63d0\u4f9b1,024(210)\u4e2a\u552f\u4e00\u5730\u5740\u3002\u5982\u679c\u8981\u5c06\u591a\u4e2a\u4ece\u673a\u8fde\u63a5\u5230\u5355\u4e2a\u4e3b\u673a\u65f6\uff0c\u8bf7\u4f7f\u75284.7K\u6b27\u7684\u4e0a\u62c9\u7535\u963b\u5c06\u5b83\u4eec\u8fde\u63a5\uff0c\u4f8b\u5982\u5c06SDA\u548cSCL\u7ebf\u8fde\u63a5\u5230Vcc\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

\u591a\u4e2a\u4e3b\u673aVS\u591a\u4e2a\u4ece\u673a<\/strong><\/p>\n\n\n\n

I2C\u652f\u6301\u591a\u4e2a\u4e3b\u673a\u540c\u65f6\u4e0e\u591a\u4e2a\u4ece\u673a\u76f8\u8fde\uff0c\u5f53\u4e24\u4e2a\u4e3b\u673a\u8bd5\u56fe\u901a\u8fc7SDA\u7ebf\u8def\u540c\u65f6\u53d1\u9001\u6216\u63a5\u6536\u6570\u636e\u65f6\uff0c\u5c31\u4f1a\u51fa\u73b0\u95ee\u9898\u3002\u56e0\u6b64\u6bcf\u4e2a\u4e3b\u673a\u90fd\u9700\u8981\u5728\u53d1\u9001\u6d88\u606f\u4e4b\u524d\u68c0\u6d4bSDA\u7ebf\u662f\u4f4e\u7535\u5e73\u8fd8\u662f\u9ad8\u7535\u5e73\u3002\u5982\u679cSDA\u7ebf\u4e3a\u4f4e\u7535\u5e73\uff0c\u5219\u610f\u5473\u7740\u53e6\u4e00\u4e2a\u4e3b\u673a\u6b63\u5728\u63a7\u5236\u603b\u7ebf\u3002\u5982\u679cSDA\u7ebf\u9ad8\uff0c\u5219\u53ef\u4ee5\u5b89\u5168\u5730\u53d1\u9001\u6570\u636e\u3002\u5982\u679c\u8981\u5c06\u591a\u4e2a\u4e3b\u673a\u8fde\u63a5\u5230\u591a\u4e2a\u4ece\u673a\uff0c\u8bf7\u4f7f\u75284.7K\u6b27\u7684\u4e0a\u62c9\u7535\u963b\u5c06SDA\u548cSCL\u7ebf\u8fde\u63a5\u5230Vcc\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

\u4f18\u52a3<\/strong><\/p>\n\n\n\n

\u4e0e\u5176\u4ed6\u534f\u8bae\u76f8\u6bd4\uff0cI2C\u53ef\u80fd\u542c\u8d77\u6765\u5f88\u590d\u6742\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5229\u5f0a\uff0c\u53ef\u5e2e\u52a9\u60a8\u786e\u5b9a\u5b83\u4eec\u662f\u5426\u9002\u5408\u60a8\u7684\u9879\u76ee\u9700\u6c42\uff1a<\/p>\n\n\n\n

\u4f18\u70b9<\/strong><\/p>\n\n\n\n

\u4ec5\u4f7f\u7528\u4e24\u6839\u7535\u7ebf\u652f\u6301\u591a\u4e2a\u4e3b\u673a\u548c\u591a\u4e2a\u4ece\u673a\u6bcf\u4e2aUART\u7684\u6ce2\u7279\u7387\u5fc5\u987b\u5728\u5f7c\u6b64\u768410\uff05\u4e4b\u5185\u786c\u4ef6\u6bd4UART\u66f4\u7b80\u5355\u4f17\u6240\u5468\u77e5\u4e14\u88ab\u5e7f\u6cdb\u4f7f\u7528\u7684\u534f\u8bae\u7f3a\u70b9<\/strong><\/p>\n\n\n\n

\u6570\u636e\u4f20\u8f93\u901f\u7387\u6bd4SPI\u6162\u6570\u636e\u5e27\u7684\u5927\u5c0f\u9650\u5236\u4e3a8\u4f4d<\/p>\n","protected":false},"excerpt":{"rendered":"

I2C\u603b\u7ebf\u662f\u7531Philips\u516c\u53f8\u5f00\u53d1\u7684\u4e00\u79cd\u7b80\u5355\u3001\u53cc\u5411\u4e8c\u7ebf\u5236\u540c\u6b65\u4e32\u884c\u603b\u7ebf\u3002\u5b83\u53ea\u9700\u8981\u4e24\u6839\u7ebf\u5373\u53ef\u4f20\u9001\u4fe1\u606f\u3002\u5b83\u7ed3\u5408\u4e86 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,54],"tags":[],"class_list":["post-511","post","type-post","status-publish","format-standard","hentry","category-lot","category-protocol"],"_links":{"self":[{"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/posts\/511","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/comments?post=511"}],"version-history":[{"count":2,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/posts\/511\/revisions"}],"predecessor-version":[{"id":524,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/posts\/511\/revisions\/524"}],"wp:attachment":[{"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/media?parent=511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/categories?post=511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/tags?post=511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}