{"id":343,"date":"2022-02-17T18:59:26","date_gmt":"2022-02-17T10:59:26","guid":{"rendered":"https:\/\/blogs.gongqilin.cn\/?p=343"},"modified":"2022-02-17T19:21:07","modified_gmt":"2022-02-17T11:21:07","slug":"%e5%85%b3%e4%ba%8eiic%e7%94%b5%e5%b9%b3%e5%8f%aa%e6%9c%89%e4%b8%8a%e6%8b%89%e4%b8%80%e7%89%88","status":"publish","type":"post","link":"https:\/\/blogs.gongqilin.cn\/?p=343","title":{"rendered":"\u5173\u4e8eIIC\u603b\u7ebf\u4f7f\u7528\u793a\u6ce2\u5668\u91c7\u96c6\u53ea\u89c2\u5bdf\u5230\u4e00\u534aVCC\u7535\u5e73\u7684\u73b0\u8c61"},"content":{"rendered":"<p>\u4eca\u5929\u540c\u4e8b\u53d1\u73b0\u4e86\u4e00\u4e2a\u6709\u610f\u601d\u7684\u73b0\u8c61\uff0cIIC\u4e3b\u673a\u53d1\u90018bit\u6570\u636e\u540e\uff0c\u4ece\u673a\u56de\u590d\u4e00\u4e2a\u4f4e\u7535\u5e73\u3002\u4f46\u662f\u793a\u6ce2\u5668\u5374\u91c7\u96c6\u5230\u4e86\u4e00\u4e2a\u53ea\u6709\u4e00\u534a\u7535\u538b\u7684\u7535\u5e73\u3002\u5148\u4e0a\u7535\u8def\u56fe\u3002<\/p>\n<p><img class=\"wp-image-346 size-full aligncenter\" data-original=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709091473.png\"  \/><\/p>\n<noscript><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"525\" class=\"wp-image-346 size-full aligncenter\" src=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709091473.png\" \/><\/p><\/noscript>\n<p>IIC\u7535\u8def\u56fe\u6ca1\u5565\u95ee\u9898\uff0c\u518d\u4e0a\u53d1\u73b0\u95ee\u9898\u65f6\u7684\u65f6\u5e8f\u56fe\uff0c\u5982\u4e0b\u3002<\/p>\n<p><img class=\"wp-image-345 aligncenter\" data-original=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/202202170837311.png\"  width=\"1196\" height=\"647\" \/><\/p>\n<noscript><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-345 aligncenter\" src=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/202202170837311.png\" width=\"1196\" height=\"647\" \/><\/p><\/noscript>\n<p>\u9996\u5148\u6211\u4eec\u5148\u7b80\u5355\u56de\u987e\u4e00\u4e0bIIC\u65f6\u5e8f\u3002SCL\uff0cSDA\u9ad8\u7535\u5e73\u603b\u7ebf\u7a7a\u95f2\u3002SCL\u4fdd\u6301\u9ad8\u7535\u5e73\u65f6\uff0cSDA\u7531\u9ad8-&gt;\u4f4e\u8df3\u53d8\u4e3a\u8d77\u59cb\u4fe1\u53f7\u3002SDA\u7531\u4f4e-&gt;\u9ad8\u4e3a\u7ed3\u675f\u4fe1\u53f7\u3002\u4f20\u8f93\u6570\u636e\u65f6\u53ea\u80fd\u5728SCL\u4e3a\u4f4e\u7535\u5e73\u662f\u8fdb\u884c\u53d8\u5316\u3002SCL\u4e3a\u9ad8\u7535\u5e73\u65f6SDA\u7535\u5e73\u4e0d\u53d8\uff0c\u5bf9SDA\u91c7\u6837\u3002<\/p>\n<h2>\u4e00 \u770b\u65f6\u5e8f\u56fe<\/h2>\n<p>\u5148\u770b\u770b\u65f6\u5e8f\u56fe\uff0c\u7ea2\u8272\u4e3aSCL\uff0c\u767d\u8272\u4e3aSDA\u3002\u5148\u8d77\u59cb\u4fe1\u53f7\uff0c\u518d\u53d1\u90018\u4e2abit\u6570\u636e\uff0c\u8fd9\u4e2a\u65f6\u5019\u4ece\u673a\u5e94\u8be5\u56de\u590d\u4f4e\u7535\u5e73\u8868\u793a\u63a5\u6536\u5230\u4e86\u6570\u636e\u3002\u4f46\u662f\u6211\u4eec\u53d1\u73b0\u4e0a\u9762\u51fa\u73b0\u4e00\u4e2a\u4e00\u534aVCC\u7535\u538b\u7684\u65b9\u6ce2\u3002\u4e14\u5728\u53d1\u9001\u7b2c\u4e09\u4e2a\u5b57\u8282\u7684\u65f6\u5019\u53d1\u73b0\u8fd9\u4e2a\u534a\u6ce2\u6301\u7eed\u65f6\u95f4\u5f88\u957f\u3002\u8fd9\u91cc\u5c31\u5f15\u51fa\u4e86\u4e24\u4e2a\u95ee\u9898<\/p>\n<ol>\n<li>\u4e3a\u4ec0\u4e48 \u51fa\u73b0\u4e00\u4e2a\u6ce2\u5f62\u7535\u5e73\u53ea\u67093.3V\u7684\u4e00\u534a\u5de6\u53f3\u3002<\/li>\n<li>\u8fd9\u4e2a\u534a\u6ce2\u6709\u4e9b\u957f\u6709\u4e9b\u77ed\u3002<\/li>\n<\/ol>\n<h2>\u4e8c \u770b\u4ee3\u7801<\/h2>\n<p>\u9996\u5148\u521d\u59cb\u5316IIC\u7684\u521d\u59cb\u5316\uff0c\u8fd9\u91cc\u5c31\u53d1\u73b0\u4e86\u4e00\u4e2a\u95ee\u9898GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP\uff1bGPIO\u7684\u5de5\u4f5c\u6a21\u5f0f\u914d\u7f6e\u4e3a\u4e86\u63a8\u633d\u8f93\u51fa\u3002\u663e\u7136\u8fd9\u91cc\u6709\u95ee\u9898\uff0c\u5982\u679c\u603b\u7ebf\u4e0a\u7684\u4e24\u4e2a\u8bbe\u5907\u90fd\u662f\u5f00\u6f0f\u8f93\u51fa\u65f6\uff0c\u5904\u4e8e\u603b\u7ebf\u7a7a\u95f2\uff0c\u4e24\u4e2a\u90fd\u662f\u9ad8\u7535\u5e73\uff0c\u95ee\u9898\u4e0d\u5927\uff0c\u5982\u679c\u4e00\u4e2a\u8bbe\u5907\u60f3\u8981\u5360\u7528\u603b\u7ebf\u5c31\u8981\u62c9\u4f4eSDA\uff0c\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\u5c31\u4f1a\u9020\u6210\u77ed\u8def\u3002\u5982\u4e0b\uff0cVDD\u548c\u5730\u57fa\u672c\u5c31\u7b97\u77ed\u63a5\u4e86\uff0c\u8fd9\u4e2a\u65f6\u5019mos\u7ba1\u53ea\u6709\u4e0d\u52301\u03a9\u7684\u7535\u963b\u4e0d\u5230\uff0c\u7535\u6d41\u5f88\u5927\u3002\u6240\u4ee5\u4e00\u822c\u603b\u7ebf\u8bbe\u5907\u90fd\u4f7f\u7528\u5f00\u6f0f\u8f93\u51fa\u3002\u8fd9\u65f6\u8f93\u51fa\u903b\u8f910\uff0c\u5219N-MOS\u6fc0\u6d3b\uff0c\u8f93\u51fa\u4f4e\u7535\u5e73\uff1b \u8f93\u51fa\u903b\u8f911\uff0cN-MOS\u4e0d\u4f1a\u6fc0\u6d3b, \u4e0d\u4f1a\u8f93\u51fa\u9ad8\u7535\u5e73\u3002\u8fd9\u5c31\u9700\u8981\u4e00\u4e2a\u5916\u63a5\u4e0a\u62c9\u7535\u963b\uff0c\u5728\u8f93\u51fa\u8f93\u51fa\u903b\u8f911\uff0cIO\u4e5f\u80fd\u8f93\u51fa\u9ad8\u7535\u5e73\uff0c\u8fd9\u4e5f\u662f\u4e0a\u9762IIC\u7535\u8def\u56fe\u7684\u539f\u7406\u3002<\/p>\n<p><img class=\"wp-image-347 size-full aligncenter\" data-original=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709194526.png\"  \/><\/p>\n<noscript><img loading=\"lazy\" decoding=\"async\" width=\"589\" height=\"323\" class=\"wp-image-347 size-full aligncenter\" src=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709194526.png\" \/><\/p><\/noscript>\n<p>\u56de\u5230\u95ee\u98981\u4e0a\uff0c\u90a3\u4e48\u7535\u538b\u7684\u4e00\u534a\u53c8\u662f\u600e\u4e48\u6765\u7684\u5462\uff0c\u5f53\u4e3b\u673a\u914d\u7f6e\u4e3a\u63a8\u633d\u8f93\u51fa\u65f6\uff0c\u4ece\u673a\u4e3a\u5f00\u6f0f\u8f93\u51fa\uff0c\u5f53\u4e3b\u673a\u53d1\u9001\u4e00\u4e2a\u5b57\u8282\uff088bit\uff09\u6570\u636e\u540e\uff0c\u4ece\u673a\u56de\u590d\u4e00\u4e2aACK\u4fe1\u53f7\uff08SCL\u7535\u5e73\u671f\u95f4\u62c9\u4f4eSDA\uff09\uff0c\u4e3b\u673a\u7b49\u5f85\u4ece\u673a\u7684ACK\u4fe1\u53f7\uff0c\u4e3a\u4e86\u9632\u6b62\u4e3b\u673a\u53d1\u9001\u7684\u6700\u540e\u4e00\u4e2abit\u4e3a0\uff0c\u9020\u6210\u8bef\u4ee5\u4e3a\u6536\u5230\u4ece\u673a\u7684ACK\uff0c\u6240\u4ee5\u4e3b\u673a\u53d1\u9001\u5b8c\u6570\u636e\u540e\u4f1a\u62c9\u9ad8SDA\u3002\u5728\u7b49\u5f85ACK\u4fe1\u53f7\u3002\u67e5\u770b\u4ee3\u7801\u5982\u4e0b<\/p>\n<pre class=\"prettyprint linenums\">static uint8_t I2C_Wait_Ack(void)\r\n{\r\n    u8 i = 0;\r\n    I2C_SDA_IN();   \/\/\u914d\u7f6e\u4e3a\u4e0a\u62c9\u8f93\u51fa\r\n    I2C_SDA_WRITE = 1; \/\/\u62c9\u9ad8SDA\r\n    delay_us(1);\r\n    I2C_SCL = 1;\r\n    delay_us(1);\r\n    while(I2C_SDA_READ)\r\n    {\r\n        i++;\r\n        if(i &gt; 250)\r\n        {\r\n            I2C_Stop();\r\n            return 1;\r\n        }\r\n    }\r\n    I2C_SCL = 0;\r\n    return 0;\r\n}ddisanb<\/pre>\n<h2>\u4e09 \u770b\u624b\u518c<\/h2>\n<p>\u8fd9\u65f6\uff0c\u4e3a\u4e86\u68c0\u6d4b\u4ece\u673a\u7684ACK\uff0c\u7a0b\u5e8f\u914d\u7f6e\u4e3a\u4e86\u4e0a\u62c9\u8f93\u5165\uff0c\u53c8\u53bb\u63a7\u5236ODR\u5bc4\u5b58\u5668\uff0c\u62c9\u9ad8\u4e86SDA\u3002\u67e5\u770b\u624b\u518cIO\u7aef\u53e3\u7684\u539f\u7406\u56fe<\/p>\n<p><img class=\"wp-image-348 size-full aligncenter\" data-original=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709382163.png\"  \/><\/p>\n<noscript><img loading=\"lazy\" decoding=\"async\" width=\"771\" height=\"460\" class=\"wp-image-348 size-full aligncenter\" src=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709382163.png\" \/><\/p><\/noscript>\n<p>\u8fd9\u91cc\u4e3b\u673a\u63a8\u633d\u8f93\u51fa\uff0c\u4ece\u673a\u5f00\u6f0f\u8f93\u51fa\uff0cmos\u5bfc\u901a\u540e\u7b49\u6548\u4e3a\u4e00\u4e2a\u5c0f\u7535\u963b\uff0c\u4e0d\u52301\u03a9\uff0c\u901a\u8fc7\u4e0eIIC\u7535\u8def\u7ed3\u5408\uff0c\u5728\u7b80\u5316\u7535\u8def\u5982\u4e0b\u56fe\u5de6\u6240\u793a\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba4\u4e3a\u63a8\u633d\u8f93\u51famos\u7ba1\u7b49\u6548\u7535\u963b\u548c\u4e0a\u62c9\u7535\u963b\u5e76\u8054\uff0c\u4f46\u662f\u4e0e\u4e0a\u62c9\u7535\u963b\u5dee\u8ddd\u8fc7\u5927\uff0c\u51e0\u4e4e\u53ef\u4ee5\u5ffd\u7565\u3002\u518d\u6b21\u7b80\u5316\u5c31\u5982\u53f3\u56fe\u6240\u793a\uff0c\u6240\u4ee5\u6d4b\u91cf\u603b\u7ebf\u7535\u538b\u65f6\uff0c\u53ea\u6709\u4e00\u534a\uff0c\u5c31\u662f\u4e24\u4e2a\u7535\u963b\u5bf93.3V\u5206\u538b\u3002\u8fd9\u4e2a\u65f6\u5019\u5c31\u662f\u524d\u9762\u63a8\u633d\u8f93\u51fa\u63d0\u5230\u7684\u77ed\u8def\u4e86\uff0c\u56e0\u4e3a\u7535\u963b\u5f88\u5c0f\uff0c\u7535\u6d41\u5c31\u4f1a\u5f88\u5927\u3002\u4f46\u662f\u65f6\u5e8f\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c\u5176\u5b9e\u6301\u7eed\u65f6\u95f4\u5c31\u51e0\u4e2aus\uff0c\u6240\u4ee5\u5417\uff0c\u6ca1\u6709\u70e7\u574f\u7535\u8def\uff0c\u5982\u679c\u8fd9\u65f6\u56e0\u4e3a\u4e00\u4e9b\u7a0b\u5e8f\u5904\u7406\u7684\u95ee\u9898\uff0c\u9020\u6210\u8fd9\u91cc\u7b49\u5f85\u592a\u4e45\u7684\u65f6\u95f4\uff0c\u5c31\u53ef\u4ee5\u4f1a\u70e7\u6bc1\u7535\u8def\u3002<\/p>\n<p><img class=\"wp-image-349  alignleft\" data-original=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709434424.png\"  width=\"358\" height=\"335\" \/><\/p>\n<noscript><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-349  alignleft\" src=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709434424.png\" width=\"358\" height=\"335\" \/><\/p><\/noscript>\n<p><img class=\"wp-image-350 alignnone\" data-original=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709455845.png\"  width=\"333\" height=\"334\" \/><\/p>\n<noscript><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-350 alignnone\" src=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021709455845.png\" width=\"333\" height=\"334\" \/><\/p><\/noscript>\n<p>&nbsp;<\/p>\n<h2>\u56db \u518d\u770b\u65f6\u5e8f\u56fe<\/h2>\n<p>\u8fd9\u65f6\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\u7535\u538b\u53ea\u6709\u4e00\u534a\u7684\u539f\u56e0\u4e86\uff0c\u901a\u8fc7\u5206\u6790\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\uff0c\u5728\u4e3b\u673a\u53d1\u9001\u4e00\u4e2a\u5b57\u8282\u540e\uff0c\u6700\u540e\u4e00\u4e2abit\u4e3a0\uff0c\u8fd9\u65f6\u4ece\u673a\u5728SCL\u62c9\u4f4e\u540e\u7acb\u5373\u56de\u590d\uff0c\u4e5f\u5904\u4e8e\u4f4e\u7535\u5e73\uff0c\u6240\u4ee5\u4fdd\u6301\u4e86\u4e00\u6bb5\u65f6\u95f4\u7684\u4f4e\u7535\u5e73\u3002\u8fd9\u65f6\u4e3b\u673a\u518d\u6b21\u62c9\u9ad8SDA\u63a8\u633d\u8f93\u51fa\u9ad8\u7535\u5e73\uff0c\u800c\u4ece\u673a\u5f00\u6f0f\u8f93\u51fa\u7535\u5e73\uff0c\u793a\u6ce2\u5668\u5c31\u91c7\u96c6\u5230\u4e00\u534a\u7684\u7535\u538b\uff0c\u800c\u7b2c\u4e09\u4e2a\u5b57\u8282\u6700\u540e\u4e00\u4e2abit\u4e3a1\u63a8\u633d\u8f93\u51fa\u9ad8\u7535\u5e73\uff0c\u4ece\u673a\u5728SCL\u62c9\u4f4e\u540e\u7acb\u5373\u56de\u590d\u5f00\u6f0f\u8f93\u51fa\u7535\u5e73\uff0c\u6240\u4ee5\u7acb\u9a6c\u51fa\u73b0\u534a\u6ce2\u3002\u8fd9\u5c31\u662f\u7b2c\u4e8c\u4e2a\u95ee\u9898\u7684\u539f\u56e0\u4e86\u3002\u4f46\u662f\u65b0\u7684\u95ee\u9898\u53c8\u51fa\u73b0\u4e86\uff0c\u67e5\u770b\u7a0b\u5e8fI2C_SDA_WRITE = 1; \/\/\u62c9\u9ad8SDA \u3002\u8fd9\u91cc\u53ea\u62c9\u9ad8\u4e86SDA\uff0c\u5e76\u6ca1\u6709\u62c9\u4f4eSDA\uff0c\u4e3a\u4f55\u534a\u6ce2\u53ea\u6301\u7eed\u4e86\u4e00\u77ac\u95f4\u5462\uff1f\u800c\u4e14\u4e3a\u4f55\u8bbe\u7f6e\u4e3a\u8f93\u5165\u6a21\u5f0f\u540e\u8fd8\u53ef\u4ee5\u7ee7\u7eed\u8f93\u51fa\u5462\uff1f<\/p>\n<h2>\u4e94 \u518d\u770b\u4ee3\u7801<\/h2>\n<p>\u5e26\u7740\u7591\u95ee\u7ee7\u7eed\u67e5\u770b\u4ee3\u7801\uff0c\u5728\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5e76\u6ca1\u6709\u53d1\u73b0\u4e3b\u673a\u518d\u6b21\u4e3b\u52a8\u62c9\u4f4eSDA\u3002\u5728\u914d\u7f6e\u5b8cGPIO\u4e3a\u4e0a\u62c9\u8f93\u5165\u540e\uff0c\u901a\u8fc7\u914d\u7f6eODR\u5bc4\u5b58\u5668\u8bbe\u7f6eIO\u53e3\u8f93\u51fa1\u3002\u8fd9\u5c31\u5f88\u5947\u602a\uff0c\u624b\u518c\u6e05\u695a\u7684\u63cf\u8ff0\u4e86\u5728\u8bbe\u7f6e\u4e3a\u8f93\u5165\u6a21\u5f0f\u540e\uff0c\u8f93\u51fa\u88ab\u7981\u7528\u3002\u5199\u4e00\u4e2a\u6d4b\u8bd5\u4ee3\u7801\u627e\u4e86\u4e00\u4e2a\u6ca1\u6709\u4f7f\u7528\u7684GPIO\uff0c\u521d\u59cb\u5316IO\u4e3a\u4e0a\u62c9\u8f93\u5165\u6a21\u5f0f\u3002\u5b9a\u65f6\u8bfb\u53d6GPIO\u72b6\u6001\uff0c\u5982\u679c\u4e3a\u9ad8\u7535\u5e73\u5219\u6253\u5f00LED\u706f\uff0c\u4e14\u62c9\u4f4e\u8be5GPIO\uff08GPIO_ResetBits\uff08\uff09\uff09\uff0c\u5982\u679c\u4e3a\u4f4e\u7535\u5e73\u5219\u5173\u95edLED,\u4e14\u62c9\u9ad8\u8be5GPIO\uff08GPIO_SetBits\uff08\uff09\uff09\u3002\u901a\u8fc7\u67e5\u770bLED\u72b6\u6001\uff0c\u786e\u8ba4\u662f\u5426\u8bbe\u7f6e\u9ad8\u4f4e\u7535\u5e73\u6210\u529f\u3002\u6700\u540eLED\u7adf\u7136\u771f\u7684\u5f00\u59cb\u95ea\u70c1\u3002\u5230\u8fd9\u91cc\u6211\u5c31\u5f00\u59cb\u6000\u7591\u624b\u518c\u5199\u9519\u4e86\u3002\u4f46\u662f\u8fd9\u4e2a\u95ee\u9898\u5e94\u8be5\u5f88\u5e38\u89c1\u624d\u5bf9\uff0c\u4e3a\u4ec0\u4e48\u7f51\u4e0a\u4e5f\u6ca1\u6709\u8d44\u6599\u5462\uff1f<\/p>\n<h2>\u516d \u518d\u770b\u624b\u518c<\/h2>\n<p>\u6ca1\u529e\u6cd5\u53ea\u6709\u518d\u7ee7\u7eed\u67e5\u770b\u624b\u518c\uff0c\u770b\u770b\u662f\u5426\u6709\u4ec0\u4e48\u9057\u6f0f\u7684\u3002\u76f4\u5230\u6211\u53d1\u73b0\u8fd9\u4e00\u5f20\u8868\u3002<\/p>\n<p><img class=\"wp-image-351 size-full aligncenter\" data-original=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021710141963.png\"  \/><\/p>\n<noscript><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"325\" class=\"wp-image-351 size-full aligncenter\" src=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021710141963.png\" \/><\/p><\/noscript>\n<p>\u5982\u679c\u770b\u4e86STM32\u624b\u518c\u6216\u8005\u6e90\u7801\u7684\u90fd\u5e94\u8be5\u77e5\u9053\uff0cGPIO\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6eBSRR\u3001BRR\u3001ODR\u8fd9\u4e09\u4e2a\u5bc4\u5b58\u5668\u6765\u63a7\u5236GPIO\u8f93\u51fa\u9ad8\u4f4e\u7535\u5e73\u3002\u800c\u6211\u4eec\u4f7f\u7528GPIO_ResetBits\u548cGPIO_SetBits\u8fd9\u4e9b\u5e93\u51fd\u6570\u5c31\u662f\u63a7\u5236\u7684\u8fd9\u4e9b\u5bc4\u5b58\u5668\u3002\u4f46\u662f\u5f88\u5c11\u4eba\u77e5\u9053ODR\u4e5f\u53ef\u4ee5\u7528\u6765\u914d\u7f6e\u8f93\u5165\u6a21\u5f0f\u4e0b\u7684\u4e0a\u62c9\u7535\u963b\u548c\u4e0b\u62c9\u7535\u963b\u3002\u800cODR\u5bc4\u5b58\u5668\u4e5f\u8bf4\u660e\u4e86\u5bf9GPIOx_BSRR(x = A\u2026E)\uff0c\u53ef\u4ee5\u5206\u522b\u5730\u5bf9\u5404\u4e2aODR\u4f4d\u8fdb\u884c\u72ec\u7acb\u7684\u8bbe\u7f6e\/\u6e05\u9664\u3002\u77e5\u9053\u8fd9\u4e9b\u77e5\u8bc6\u70b9\u540e\uff0c\u6211\u5c31\u660e\u767d\u4e86\uff0c\u5176\u5b9e\u8c03\u7528GPIO_SetBits\u51fd\u6570\u540e\u5e76\u4e0d\u662f\u8f93\u51fa\u4e86\u9ad8\u7535\u5e73\u3002\u800c\u662f\uff0c\u8bbe\u7f6e\u4e3a\u4e0a\u62c9\u8f93\u5165\uff0c\u7531\u4e8e\u6709\u4e0a\u62c9\u7535\u963b\uff0c\u5bf9\u5916\u91c7\u96c6\u5230\u9ad8\u7535\u5e73\u3002GPIO_ResetBits\u540c\u7406\u8bbe\u7f6e\u4e3a\u4e0b\u62c9\u3002\u7b80\u5316\u5982\u4e0b\uff0c\u8fd9\u65f6\u5019\u91c7\u96c6\u7684\u53ea\u662f\u8f93\u5165\u5185\u90e8\u7684\u4e0a\u62c9\u7535\u963b\/\u4e0b\u62c9\u7535\u963b\u540e\u7684\uff0c\u5e76\u4e0d\u662f\u8f93\u51fa\u7684\u7535\u5e73\u4fe1\u53f7\u3002\u53ea\u662f\u6211\u4eec\u4e00\u822c\u901a\u8fc7\u5e93\u51fd\u6570\u914d\u7f6eGPIO\u4e3a\u8f93\u5165\u6a21\u5f0f\u65f6\uff0c\u6ca1\u6709\u53bb\u67e5\u770b\u63a7\u5236\u7684\u90a3\u4e2a\u5bc4\u5b58\u5668\uff0c\u800c\u914d\u7f6e\u5b8c\u540e\uff0c\u4e5f\u4e0d\u4f1a\u4f7f\u7528GPIO_SetBits\u7b49\u51fd\u6570\u53bb\u8ba9\u8f93\u5165\u53e3\u8f93\u51fa\uff0c\u6240\u4ee5\u5c31\u6ca1\u6709\u53d1\u73b0\u8fd9\u4e2a\u95ee\u9898\u6240\u5728\u3002<\/p>\n<p><img class=\"wp-image-359 size-full aligncenter\" data-original=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021711203380.png\"  \/><\/p>\n<noscript><img loading=\"lazy\" decoding=\"async\" width=\"307\" height=\"397\" class=\"wp-image-359 size-full aligncenter\" src=\"http:\/\/blogs.gongqilin.cn\/wp-content\/uploads\/2022\/02\/2022021711203380.png\" \/><\/p><\/noscript>\n<h2>\u7b2c\u4e03\u6b65 \u518d\u770b\u6e90\u7801<\/h2>\n<p>\u539f\u7406\u5df2\u7ecf\u77e5\u9053\u4e86\uff0c\u8bbe\u7f6e\u4e3a\u4e0a\u62c9\u8f93\u5165\u540e\uff0cI2C_SDA_WRITE = 1; \u53ea\u662f\u53bb\u8bbe\u7f6eODR\uff0c\u4f46\u662f\u8fd9\u4e2a\u65f6\u5019\uff0c\u8be5\u4f4d\u5df2\u7ecf\u662f1\uff0c\u4ee3\u8868\u4e0a\u62c9\u7535\u963b\u3002\u90a3\u8fd9\u4e00\u53e5\u8bdd\u5c31\u6ca1\u6709\u4efb\u4f55\u610f\u4e49\u4e86\u5440\u3002\u90a3\u62c9\u9ad8\u7684\u90a3\u4e2a\u7535\u5e73\u4fe1\u53f7\u6765\u81ea\u54ea\u5462\uff1f \u8fd9\u65f6\u5019\u5c31\u8981\u67e5\u770b\u6e90\u7801\u4e86\u3002GPIO\u7684\u914d\u7f6e\u662f\u5982\u4f55\u5b8c\u6210\u7684\u3002\u8bf7\u8bb0\u4f4f\u5728\u914d\u7f6e\u524d<div id=\"sc_warn\">GPIO\u8fd8\u662f\u5904\u4e8e\u63a8\u633d\u8f93\u51fa\u6a21\u5f0f<\/div>\u3002\u67e5\u770b\u5e93\u51fd\u6570GPIO_Init\uff08\uff09\u5b9e\u73b0\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd9\u4e48\u4e00\u6bb5\u4ee3\u7801\uff08F1\u7684GPIO\u914d\u7f6e\u5206\u4e3a\u9ad88\u4f4d\u548c\u4f4e8\u4f4d\uff0c\u5185\u5bb9\u662f\u76f8\u540c\u7684\uff09\uff0c\u6211\u4eec\u8fd9\u91cc\u770b\u4f4e8\u4f4d\u7684\u3002<\/p>\n<pre class=\"prettyprint linenums\">\u00a0\r\n  \/* Configure the eight low port pins *\/\r\n  if (((uint32_t)GPIO_InitStruct-&gt;GPIO_Pin &amp; ((uint32_t)0x00FF)) != 0x00)\r\n  {\r\n    tmpreg = GPIOx-&gt;CRL;\r\n    for (pinpos = 0x00; pinpos &lt; 0x08; pinpos++)\r\n    {\r\n      pos = ((uint32_t)0x01) &lt;&lt; pinpos; \/* Get the port pins position *\/ currentpin = (GPIO_InitStruct-&gt;GPIO_Pin) &amp; pos;\r\n      if (currentpin == pos)\r\n      {\r\n        pos = pinpos &lt;&lt; 2;\r\n        \/* Clear the corresponding low control register bits *\/\r\n        pinmask = ((uint32_t)0x0F) &lt;&lt; pos;\r\n        tmpreg &amp;= ~pinmask;\r\n        \/* Write the mode configuration in the corresponding bits *\/\r\n        tmpreg |= (currentmode &lt;&lt; pos); \/* Reset the corresponding ODR bit *\/ if (GPIO_InitStruct-&gt;GPIO_Mode == GPIO_Mode_IPD)\r\n        {\r\n          GPIOx-&gt;BRR = (((uint32_t)0x01) &lt;&lt; pinpos); \r\n        } \r\n        else \r\n        {\r\n          \/* Set the corresponding ODR bit *\/ \r\n          if (GPIO_InitStruct-&gt;GPIO_Mode == GPIO_Mode_IPU)\r\n          {\r\n            GPIOx-&gt;BSRR = (((uint32_t)0x01) &lt;&lt; pinpos); \r\n           } \r\n        }\r\n      } \r\n     }\r\n     GPIOx-&gt;CRL = tmpreg;\r\n  }\r\n<\/pre>\n<p>\u4ece\u8fd9\u91cc\u770b\u5230\u5982\u679c\u662f\u914d\u7f6e\u4e3aGPIO_Mode_IPU\u4e0a\u62c9\u8f93\u5165\u6a21\u5f0f\uff0cGPIOx-&gt;BSRR = (((uint32_t)0x01) &lt;&lt; pinpos)\uff0c\u5c31\u4f1a\u53bb\u63a7\u5236\u76f8\u5e94\u4f4d\u7f6e\u7684BSRR\uff08\u8fd9\u5c31\u662f\u524d\u9762\u8bf4\u8f93\u5165\u6a21\u5f0f\u4e0b\u7684\u53bb\u63a7\u5236ODR\u5bc4\u5b58\u5668\u8fbe\u5230\u63a7\u5236\u8f93\u5165\u4e0a\u62c9\u4e0b\u62c9\uff09\uff0c\u518d\u4fee\u6539GPIOx-&gt;CRL\u5bc4\u5b58\u5668\uff0c\u8fbe\u5230\u4fee\u6539\u5de5\u4f5c\u6a21\u5f0f\u7684\u6548\u679c\u3002\u4f46\u662f\u6211\u4eec\u8981\u8bb0\u5f97\u5728\u4fee\u6539BSRR\u5bc4\u5b58\u5668\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u8fd8\u5904\u4e8e\u63a8\u633d\u8f93\u51fa\u6a21\u5f0f\u4e2d\uff0c\u9996\u5148\u6539\u53d8\u4e86GPIOx-&gt;BSRR \uff0c\u5c31\u76f8\u5f53\u4e8e\u8f93\u51fa\u8bbe\u7f6e\u63a8\u633d\u8f93\u51fa\u9ad8\u7535\u5e73\u3002\u518d\u4fee\u6539\u4e3aGPIOx-&gt;CRL\u5bc4\u5b58\u5668\uff0c\u914d\u7f6e\u4e3a\u8f93\u5165\u6a21\u5f0f\uff0c\u8fd9\u4e2a\u65f6\u5019ODR\u5bc4\u5b58\u5668\u624d\u5bf9\u4e0a\u4e0b\u62c9\u751f\u6548\u3002\u6700\u540e\u5728\u4f7f\u7528I2C_SDA_WRITE = 1; \u5176\u5b9e\u8fd9\u65f6\u5019\u5df2\u7ecf\u662f\u4e0a\u62c9\u4e86\uff0c\u8fd9\u4e00\u53e5\u6ca1\u6709\u610f\u4e49\u4e86\u3002<\/p>\n<h2>\u516b 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id=\"phraseJoinewrskdfdswerhnyikyofd\" data-v-app=\"\"><\/div>\n<div id=\"phraseJoinewrskdfdswerhnyikyofd\"><\/div>\n<div id=\"phraseJoinewrskdfdswerhnyikyofd\"><\/div>\n<div id=\"phraseJoinewrskdfdswerhnyikyofd\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5929\u540c\u4e8b\u53d1\u73b0\u4e86\u4e00\u4e2a\u6709\u610f\u601d\u7684\u73b0\u8c61\uff0cIIC\u4e3b\u673a\u53d1\u90018bit\u6570\u636e\u540e\uff0c\u4ece\u673a\u56de\u590d\u4e00\u4e2a\u4f4e\u7535\u5e73\u3002\u4f46\u662f\u793a\u6ce2\u5668\u5374\u91c7\u96c6\u5230\u4e86\u4e00\u4e2a\u53ea\u6709 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