{"id":115132,"date":"2026-10-11T08:41:09","date_gmt":"2026-10-11T00:41:09","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/115132.html"},"modified":"2026-10-11T08:41:09","modified_gmt":"2026-10-11T00:41:09","slug":"stm32%e5%bc%80%e5%8f%91%e4%b9%8biic%e9%80%9a%e4%bf%a1%e8%af%a6%e8%a7%a3%ef%bc%9a%e4%bb%8e%e5%8d%8f%e8%ae%ae%e5%9f%ba%e7%a1%80%e5%88%b0fm24cl04%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/115132.html","title":{"rendered":"STM32\u5f00\u53d1\u4e4bIIC\u901a\u4fe1\u8be6\u89e3\uff1a\u4ece\u534f\u8bae\u57fa\u7840\u5230FM24CL04\u5b9e\u6218"},"content":{"rendered":"<h3>1. IIC\u6982\u8ff0<\/h3>\n<p>IIC&#xff08;Inter-Integrated Circuit&#xff0c;\u96c6\u6210\u7535\u8def\u95f4\u603b\u7ebf&#xff09;\u662f\u4e00\u79cd\u7531\u98de\u5229\u6d66\u516c\u53f8&#xff08;\u73b0\u6069\u667a\u6d66\u534a\u5bfc\u4f53&#xff09;\u5f00\u53d1\u7684\u4e24\u7ebf\u5f0f\u4e32\u884c\u901a\u4fe1\u603b\u7ebf&#xff0c;\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5fae\u63a7\u5236\u5668\u4e0e\u5404\u7c7b\u5916\u8bbe&#xff08;\u5982 EEPROM\u3001\u4f20\u611f\u5668\u3001RTC \u65f6\u949f\u82af\u7247\u7b49&#xff09;\u4e4b\u95f4\u7684\u4f4e\u901f\u901a\u4fe1\u3002<\/p>\n<p>IIC\u603b\u7ebf\u4ec5\u9700\u4e24\u6839\u4fe1\u53f7\u7ebf\u5373\u53ef\u5b8c\u6210\u6570\u636e\u4f20\u8f93&#xff1a;<\/p>\n<ul>\n<li>SDA&#xff08;Serial Data Line&#xff0c;\u4e32\u884c\u6570\u636e\u7ebf&#xff09;&#xff1a;\u7528\u4e8e\u4f20\u8f93\u6570\u636e&#xff0c;\u53cc\u5411\u4f20\u8f93&#xff0c;\u6570\u636e\u5728 SCL \u9ad8\u7535\u5e73\u671f\u95f4\u5fc5\u987b\u4fdd\u6301\u7a33\u5b9a\u3002<\/li>\n<li>SCL&#xff08;Serial Clock Line&#xff0c;\u4e32\u884c\u65f6\u949f\u7ebf&#xff09;&#xff1a;\u7528\u4e8e\u4f20\u8f93\u65f6\u949f\u4fe1\u53f7&#xff0c;\u7531\u4e3b\u673a\u4ea7\u751f&#xff0c;\u63a7\u5236\u6570\u636e\u4f20\u8f93\u7684\u8282\u594f\u3002<\/li>\n<\/ul>\n<p>IIC\u603b\u7ebf\u5177\u6709\u4ee5\u4e0b\u663e\u8457\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u4e24\u7ebf\u5236&#xff1a;\u4ec5\u9700 SDA \u548c SCL \u4e24\u6839\u7ebf&#xff0c;\u8282\u7701\u5f15\u811a\u8d44\u6e90\u3002<\/li>\n<li>\u591a\u4e3b\u673a\u591a\u4ece\u673a&#xff1a;\u603b\u7ebf\u4e0a\u53ef\u6302\u8f7d\u591a\u4e2a\u8bbe\u5907&#xff0c;\u6bcf\u4e2a\u8bbe\u5907\u5177\u6709\u552f\u4e00\u7684 7 \u4f4d\u6216 10 \u4f4d\u5730\u5740\u3002<\/li>\n<li>\u534a\u53cc\u5de5\u901a\u4fe1&#xff1a;\u540c\u4e00\u65f6\u523b\u53ea\u80fd\u6709\u4e00\u4e2a\u65b9\u5411\u7684\u6570\u636e\u4f20\u8f93\u3002<\/li>\n<li>\u901f\u7387\u9002\u4e2d&#xff1a;\u6807\u51c6\u6a21\u5f0f 100kbit\/s&#xff0c;\u5feb\u901f\u6a21\u5f0f 400kbit\/s&#xff0c;\u9ad8\u901f\u6a21\u5f0f 3.4Mbit\/s\u3002<\/li>\n<li>\u5f00\u6f0f\u8f93\u51fa&#xff1a;SDA \u548c SCL \u5747\u4e3a\u5f00\u6f0f\u7ed3\u6784&#xff0c;\u9700\u5916\u63a5\u4e0a\u62c9\u7535\u963b\u3002<\/li>\n<\/ul>\n<p>\u5728 STM32 \u4e2d&#xff0c;IIC \u5916\u8bbe\u901a\u5e38\u96c6\u6210\u5728\u82af\u7247\u5185\u90e8&#xff0c;\u652f\u6301\u786c\u4ef6 IIC \u548c\u8f6f\u4ef6\u6a21\u62df IIC \u4e24\u79cd\u5b9e\u73b0\u65b9\u5f0f\u3002\u786c\u4ef6 IIC \u7531\u82af\u7247\u5185\u90e8\u5916\u8bbe\u81ea\u52a8\u5904\u7406\u65f6\u5e8f&#xff0c;\u8f6f\u4ef6\u6a21\u62df IIC \u5219\u901a\u8fc7 GPIO \u7ffb\u8f6c\u7535\u5e73\u5b9e\u73b0&#xff0c;\u4e24\u8005\u5404\u6709\u4f18\u52a3\u3002<\/p>\n<h3>2. IIC\u534f\u8bae<\/h3>\n<h4>2.1 \u603b\u7ebf\u7a7a\u95f2\u72b6\u6001<\/h4>\n<p>\u5f53\u603b\u7ebf\u5904\u4e8e\u7a7a\u95f2\u72b6\u6001\u65f6&#xff0c;SDA \u548c SCL \u5747\u4e3a\u9ad8\u7535\u5e73\u3002\u6b64\u65f6\u603b\u7ebf\u4e0a\u6ca1\u6709\u4efb\u4f55\u8bbe\u5907\u5360\u7528\u901a\u4fe1&#xff0c;\u4e3b\u673a\u53ef\u4ee5\u53d1\u8d77\u901a\u4fe1\u3002<\/p>\n<h4>2.2 \u8d77\u59cb\u6761\u4ef6&#xff08;START&#xff09;<\/h4>\n<p>\u8d77\u59cb\u6761\u4ef6\u662f IIC \u901a\u4fe1\u7684\u542f\u52a8\u6807\u5fd7&#xff0c;\u7531\u4e3b\u673a\u4ea7\u751f\u3002\u5176\u65f6\u5e8f\u8981\u6c42\u4e3a&#xff1a;\u5728 SCL \u4fdd\u6301\u9ad8\u7535\u5e73\u671f\u95f4&#xff0c;SDA \u7531\u9ad8\u7535\u5e73\u8df3\u53d8\u4e3a\u4f4e\u7535\u5e73\u3002<\/p>\n<p>\u8d77\u59cb\u6761\u4ef6\u4ea7\u751f\u540e&#xff0c;\u603b\u7ebf\u8fdb\u5165\u5fd9\u788c\u72b6\u6001&#xff0c;\u5176\u4ed6\u8bbe\u5907\u4e0d\u80fd\u518d\u53d1\u8d77\u901a\u4fe1\u3002<\/p>\n<h4>2.3 \u505c\u6b62\u6761\u4ef6&#xff08;STOP&#xff09;<\/h4>\n<p>\u505c\u6b62\u6761\u4ef6\u662f IIC \u901a\u4fe1\u7684\u7ed3\u675f\u6807\u5fd7&#xff0c;\u540c\u6837\u7531\u4e3b\u673a\u4ea7\u751f\u3002\u5176\u65f6\u5e8f\u8981\u6c42\u4e3a&#xff1a;\u5728 SCL \u4fdd\u6301\u9ad8\u7535\u5e73\u671f\u95f4&#xff0c;SDA \u7531\u4f4e\u7535\u5e73\u8df3\u53d8\u4e3a\u9ad8\u7535\u5e73\u3002<\/p>\n<p>\u505c\u6b62\u6761\u4ef6\u4ea7\u751f\u540e&#xff0c;\u603b\u7ebf\u6062\u590d\u7a7a\u95f2\u72b6\u6001&#xff0c;\u91ca\u653e\u603b\u7ebf\u63a7\u5236\u6743\u3002<\/p>\n<h4>2.4 \u6570\u636e\u6709\u6548\u6027<\/h4>\n<p>IIC \u534f\u8bae\u89c4\u5b9a&#xff0c;\u6570\u636e\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u5fc5\u987b\u6ee1\u8db3\u4ee5\u4e0b\u65f6\u5e8f\u8981\u6c42&#xff1a;<\/p>\n<ul>\n<li>\u6570\u636e\u7a33\u5b9a\u671f&#xff1a;\u5728 SCL \u9ad8\u7535\u5e73\u671f\u95f4&#xff0c;SDA \u4e0a\u7684\u6570\u636e\u5fc5\u987b\u4fdd\u6301\u7a33\u5b9a&#xff0c;\u4e0d\u5141\u8bb8\u53d1\u751f\u53d8\u5316\u3002<\/li>\n<li>\u6570\u636e\u53d8\u5316\u671f&#xff1a;\u5728 SCL \u4f4e\u7535\u5e73\u671f\u95f4&#xff0c;SDA \u4e0a\u7684\u6570\u636e\u624d\u5141\u8bb8\u53d1\u751f\u53d8\u5316\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e00\u89c4\u5b9a\u786e\u4fdd\u4e86\u63a5\u6536\u65b9\u5728 SCL \u9ad8\u7535\u5e73\u91c7\u6837\u65f6&#xff0c;\u8bfb\u53d6\u5230\u7684\u6570\u636e\u662f\u7a33\u5b9a\u53ef\u9760\u7684\u3002<\/p>\n<h4>2.5 \u5e94\u7b54\u673a\u5236&#xff08;ACK\/NACK&#xff09;<\/h4>\n<p>IIC\u534f\u8bae\u91c7\u7528\u5e94\u7b54\u673a\u5236\u6765\u786e\u8ba4\u6570\u636e\u63a5\u6536\u662f\u5426\u6210\u529f\u3002\u6bcf\u4f20\u8f93\u4e00\u4e2a\u5b57\u8282&#xff08;8\u4f4d\u6570\u636e&#xff09;\u540e&#xff0c;\u63a5\u6536\u65b9\u9700\u8981\u8fd4\u56de\u4e00\u4e2a\u5e94\u7b54\u4f4d&#xff1a;<\/p>\n<ul>\n<li>ACK&#xff08;\u5e94\u7b54&#xff09;&#xff1a;\u63a5\u6536\u65b9\u5728\u7b2c9\u4e2a\u65f6\u949f\u5468\u671f\u5c06SDA\u62c9\u4f4e&#xff0c;\u8868\u793a\u6210\u529f\u63a5\u6536\u6570\u636e&#xff0c;\u53ef\u4ee5\u7ee7\u7eed\u4f20\u8f93\u3002<\/li>\n<li>NACK&#xff08;\u975e\u5e94\u7b54&#xff09;&#xff1a;\u63a5\u6536\u65b9\u5728\u7b2c9\u4e2a\u65f6\u949f\u5468\u671f\u4fdd\u6301SDA\u4e3a\u9ad8\u7535\u5e73&#xff0c;\u8868\u793a\u672a\u6210\u529f\u63a5\u6536\u6216\u4e0d\u518d\u63a5\u6536\u6570\u636e\u3002<\/li>\n<\/ul>\n<p>\u4e3b\u673a\u5728\u53d1\u9001\u6570\u636e\u540e&#xff0c;\u9700\u8981\u91ca\u653eSDA\u5e76\u7b49\u5f85\u4ece\u673a\u7684\u5e94\u7b54\u4fe1\u53f7&#xff1b;\u4ece\u673a\u5728\u63a5\u6536\u6570\u636e\u540e&#xff0c;\u9700\u8981\u4e3b\u52a8\u62c9\u4f4eSDA\u4ee5\u4ea7\u751f\u5e94\u7b54\u3002<\/p>\n<h4>2.6 \u5b8c\u6574\u6570\u636e\u4f20\u8f93\u65f6\u5e8f<\/h4>\n<p>\u4e00\u6b21\u5b8c\u6574\u7684IIC\u6570\u636e\u4f20\u8f93\u8fc7\u7a0b\u5982\u4e0b&#xff1a;<\/p>\n<li>\u4e3b\u673a\u4ea7\u751f\u8d77\u59cb\u6761\u4ef6&#xff08;START&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u4ece\u673a\u5730\u5740&#xff08;7\u4f4d\u5730\u5740 &#043; 1\u4f4d\u8bfb\u5199\u6807\u5fd7\u4f4d&#xff09;&#xff0c;\u51718\u4f4d\u3002<\/li>\n<li>\u4ece\u673a\u8fd4\u56de\u5e94\u7b54\u4f4d&#xff08;ACK&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740\u6216\u6570\u636e&#xff08;\u6bcf\u5b57\u8282\u540e\u8ddf\u4e00\u4e2a\u5e94\u7b54\u4f4d&#xff09;\u3002<\/li>\n<li>\u6839\u636e\u8bfb\u5199\u65b9\u5411&#xff0c;\u7ee7\u7eed\u4f20\u8f93\u6570\u636e\u6216\u5207\u6362\u65b9\u5411\u3002<\/li>\n<li>\u4e3b\u673a\u4ea7\u751f\u505c\u6b62\u6761\u4ef6&#xff08;STOP&#xff09;&#xff0c;\u7ed3\u675f\u901a\u4fe1\u3002<\/li>\n<h4>2.7 \u65f6\u5e8f\u56fe\u8bf4\u660e<\/h4>\n<p>IIC\u65f6\u5e8f\u56fe\u662f\u7406\u89e3\u534f\u8bae\u7684\u5173\u952e\u5de5\u5177&#xff0c;\u4e0b\u9762\u7528\u6587\u5b57\u63cf\u8ff0\u6807\u51c6\u65f6\u5e8f\u56fe\u7684\u5404\u4e2a\u9636\u6bb5&#xff1a;<\/p>\n<p>\u8d77\u59cb\u9636\u6bb5&#xff1a;SCL\u4e3a\u9ad8&#xff0c;SDA\u4ece\u9ad8\u8df3\u53d8\u4e3a\u4f4e&#xff0c;\u4ea7\u751fSTART\u4fe1\u53f7\u3002<\/p>\n<p>\u5730\u5740\u4f20\u8f93\u9636\u6bb5&#xff1a;\u4e3b\u673a\u5728SCL\u7684\u9a71\u52a8\u4e0b&#xff0c;\u9010\u4f4d\u53d1\u9001\u4ece\u673a\u5730\u5740&#xff0c;\u5148\u53d1\u9001\u6700\u9ad8\u4f4d&#xff08;MSB&#xff09;&#xff0c;\u51717\u4f4d\u5730\u5740&#xff0c;\u968f\u540e\u53d1\u90011\u4f4d\u8bfb\u5199\u6807\u5fd7&#xff08;0\u8868\u793a\u5199&#xff0c;1\u8868\u793a\u8bfb&#xff09;\u3002<\/p>\n<p>\u5e94\u7b54\u9636\u6bb5&#xff1a;\u7b2c9\u4e2a\u65f6\u949f\u5468\u671f&#xff0c;\u4ece\u673a\u62c9\u4f4eSDA&#xff0c;\u4ea7\u751fACK\u5e94\u7b54\u3002<\/p>\n<p>\u6570\u636e\u4f20\u8f93\u9636\u6bb5&#xff1a;\u4e3b\u673a\u7ee7\u7eed\u53d1\u9001\u6570\u636e\u5b57\u8282&#xff0c;\u6bcf\u4e2a\u5b57\u82828\u4f4d&#xff0c;\u6bcf\u5b57\u8282\u540e\u8ddf\u4e00\u4e2aACK\u5e94\u7b54\u4f4d\u3002\u6570\u636e\u5728SCL\u9ad8\u7535\u5e73\u671f\u95f4\u4fdd\u6301\u7a33\u5b9a&#xff0c;\u5728SCL\u4f4e\u7535\u5e73\u671f\u95f4\u53d8\u5316\u3002<\/p>\n<p>\u505c\u6b62\u9636\u6bb5&#xff1a;SCL\u4e3a\u9ad8&#xff0c;SDA\u4ece\u4f4e\u8df3\u53d8\u4e3a\u9ad8&#xff0c;\u4ea7\u751fSTOP\u4fe1\u53f7&#xff0c;\u603b\u7ebf\u91ca\u653e\u3002<\/p>\n<h4>2.8 \u8bfb\u5199\u64cd\u4f5c\u793a\u4f8b<\/h4>\n<p>\u5199\u64cd\u4f5c\u6d41\u7a0b&#xff1a;\u4e3b\u673a\u53d1\u9001START \u2192 \u53d1\u9001\u4ece\u673a\u5730\u5740&#043;\u5199\u6807\u5fd7&#xff08;0&#xff09;\u2192 \u7b49\u5f85ACK \u2192 \u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740 \u2192 \u7b49\u5f85ACK \u2192 \u53d1\u9001\u6570\u636e \u2192 \u7b49\u5f85ACK \u2192 \u53d1\u9001STOP\u3002<\/p>\n<p>\u8bfb\u64cd\u4f5c\u6d41\u7a0b&#xff1a;\u4e3b\u673a\u53d1\u9001START \u2192 \u53d1\u9001\u4ece\u673a\u5730\u5740&#043;\u5199\u6807\u5fd7&#xff08;0&#xff09;\u2192 \u7b49\u5f85ACK \u2192 \u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740 \u2192 \u7b49\u5f85ACK \u2192 \u91cd\u65b0\u53d1\u9001START&#xff08;\u91cd\u590d\u8d77\u59cb\u6761\u4ef6&#xff09;\u2192 \u53d1\u9001\u4ece\u673a\u5730\u5740&#043;\u8bfb\u6807\u5fd7&#xff08;1&#xff09;\u2192 \u7b49\u5f85ACK \u2192 \u8bfb\u53d6\u6570\u636e \u2192 \u4e3b\u673a\u53d1\u9001NACK \u2192 \u53d1\u9001STOP\u3002<\/p>\n<h3>3. STM32\u4e2d\u7684IIC\u5b9e\u73b0<\/h3>\n<h4>3.1 \u786c\u4ef6IIC<\/h4>\n<p>STM32\u7cfb\u5217\u82af\u7247\u5185\u7f6eIIC\u5916\u8bbe&#xff0c;\u652f\u6301\u4e3b\u673a\u6a21\u5f0f\u548c\u4ece\u673a\u6a21\u5f0f&#xff0c;\u5177\u5907\u4e2d\u65ad\u548cDMA\u4f20\u8f93\u80fd\u529b\u3002\u786c\u4ef6IIC\u7684\u4f18\u70b9\u662fCPU\u5360\u7528\u4f4e\u3001\u65f6\u5e8f\u7cbe\u786e&#xff0c;\u4f46\u914d\u7f6e\u76f8\u5bf9\u590d\u6742&#xff0c;\u4e14\u90e8\u5206\u578b\u53f7\u7684\u786c\u4ef6IIC\u5b58\u5728\u517c\u5bb9\u6027\u95ee\u9898\u3002<\/p>\n<h4>3.2 \u8f6f\u4ef6\u6a21\u62dfIIC<\/h4>\n<p>\u8f6f\u4ef6\u6a21\u62dfIIC\u901a\u8fc7GPIO\u5f15\u811a\u624b\u52a8\u7ffb\u8f6c\u7535\u5e73&#xff0c;\u6309\u7167IIC\u65f6\u5e8f\u8981\u6c42\u9010\u4f4d\u4f20\u8f93\u6570\u636e\u3002\u5176\u4f18\u70b9\u662f\u7075\u6d3b\u3001\u517c\u5bb9\u6027\u597d\u3001\u4e0d\u53d7\u82af\u7247\u578b\u53f7\u9650\u5236&#xff0c;\u7f3a\u70b9\u662f\u5360\u7528CPU\u8d44\u6e90\u8f83\u591a\u3002<\/p>\n<h4>3.3 \u4e0a\u62c9\u7535\u963b<\/h4>\n<p>\u7531\u4e8eIIC\u603b\u7ebf\u91c7\u7528\u5f00\u6f0f\u8f93\u51fa\u7ed3\u6784&#xff0c;SDA\u548cSCL\u5fc5\u987b\u5916\u63a5\u4e0a\u62c9\u7535\u963b\u3002\u5178\u578b\u4e0a\u62c9\u7535\u963b\u503c\u4e3a4.7k\u03a9&#xff08;\u6807\u51c6\u6a21\u5f0f&#xff09;\u62162.2k\u03a9&#xff08;\u5feb\u901f\u6a21\u5f0f&#xff09;&#xff0c;\u5177\u4f53\u53d6\u503c\u9700\u6839\u636e\u603b\u7ebf\u7535\u5bb9\u548c\u901a\u4fe1\u901f\u7387\u786e\u5b9a\u3002<\/p>\n<h3>4. FM24CL04 EEPROM \u8be6\u89e3<\/h3>\n<p>FM24CL04 \u662f Cypress&#xff08;\u73b0 Infineon&#xff09;\u63a8\u51fa\u7684\u4e00\u6b3e4Kbit \u94c1\u7535\u5b58\u50a8\u5668&#xff08;FRAM&#xff09;&#xff0c;\u91c7\u7528 IIC \u63a5\u53e3\u4e0e\u4e3b\u673a\u901a\u4fe1\u3002\u4e0e\u4f20\u7edf\u7684 EEPROM \u76f8\u6bd4&#xff0c;FRAM \u5177\u6709\u5199\u5165\u901f\u5ea6\u5feb\u3001\u64e6\u5199\u5bff\u547d\u957f\u3001\u529f\u8017\u4f4e\u7b49\u663e\u8457\u4f18\u52bf&#xff0c;\u975e\u5e38\u9002\u5408\u9700\u8981\u9891\u7e41\u8bfb\u5199\u6570\u636e\u7684\u5e94\u7528\u573a\u666f\u3002<\/p>\n<h4>4.1 \u4e3b\u8981\u7279\u6027<\/h4>\n<ul>\n<li>\u5b58\u50a8\u5bb9\u91cf&#xff1a;4Kbit&#xff08;512 \u00d7 8 \u4f4d&#xff09;&#xff0c;\u7ec4\u7ec7\u4e3a\u4e24\u4e2a 256 \u5b57\u8282\u7684\u5b58\u50a8\u533a\u3002<\/li>\n<li>\u63a5\u53e3\u7c7b\u578b&#xff1a;\u6807\u51c6 IIC \u63a5\u53e3&#xff0c;\u652f\u6301 100kHz \u6807\u51c6\u6a21\u5f0f\u548c 400kHz \u5feb\u901f\u6a21\u5f0f\u3002<\/li>\n<li>\u5199\u5165\u901f\u5ea6&#xff1a;\u65e0\u9700\u7b49\u5f85\u5199\u5165\u5468\u671f&#xff0c;\u5199\u5165\u540e\u7acb\u5373\u53ef\u8bfb&#xff0c;\u5199\u5165\u901f\u5ea6\u8fdc\u5feb\u4e8e\u4f20\u7edf EEPROM\u3002<\/li>\n<li>\u64e6\u5199\u5bff\u547d&#xff1a;\u9ad8\u8fbe 10 \u4ebf\u6b21\u8bfb\u5199\u5faa\u73af&#xff0c;\u8fdc\u8d85\u666e\u901a EEPROM \u7684 100 \u4e07\u6b21\u3002<\/li>\n<li>\u6570\u636e\u4fdd\u6301&#xff1a;\u6389\u7535\u540e\u6570\u636e\u53ef\u4fdd\u6301 10 \u5e74\u4ee5\u4e0a\u3002<\/li>\n<li>\u5de5\u4f5c\u7535\u538b&#xff1a;2.7V ~ 3.6V&#xff0c;\u517c\u5bb9 3.3V \u7cfb\u7edf\u3002<\/li>\n<li>\u5c01\u88c5\u5f62\u5f0f&#xff1a;\u5e38\u89c1 SOP-8 \u5c01\u88c5&#xff0c;\u5f15\u811a\u4e0e\u6807\u51c6 24C04 EEPROM \u517c\u5bb9\u3002<\/li>\n<\/ul>\n<h4>4.2 \u5668\u4ef6\u5730\u5740\u4e0e\u5b58\u50a8\u533a\u6620\u5c04<\/h4>\n<p>FM24CL04 \u7684\u4ece\u673a\u5730\u5740\u4e3a 7 \u4f4d&#xff0c;\u683c\u5f0f\u4e3a 1010 A2 A1 A0&#xff0c;\u5176\u4e2d A2\u3001A1 \u4e3a\u786c\u4ef6\u5730\u5740\u5f15\u811a&#xff0c;A0 \u4e3a\u5b58\u50a8\u533a\u9009\u62e9\u4f4d\u3002\u7531\u4e8e\u82af\u7247\u5185\u90e8\u5212\u5206\u4e3a\u4e24\u4e2a 256 \u5b57\u8282\u7684\u5b58\u50a8\u533a&#xff0c;A0 \u4f4d\u7528\u4e8e\u9009\u62e9\u8bbf\u95ee\u54ea\u4e2a\u5b58\u50a8\u533a&#xff1a;<\/p>\n<ul>\n<li>A0 &#061; 0&#xff1a;\u8bbf\u95ee\u5b58\u50a8\u533a 0&#xff08;\u5730\u5740 0x00 ~ 0xFF&#xff09;\u3002<\/li>\n<li>A0 &#061; 1&#xff1a;\u8bbf\u95ee\u5b58\u50a8\u533a 1&#xff08;\u5730\u5740 0x00 ~ 0xFF&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u56e0\u6b64&#xff0c;FM24CL04 \u7684\u5b8c\u6574\u4ece\u673a\u5730\u5740\u4e3a 0xA0&#xff08;\u5199&#xff09;\/ 0xA1&#xff08;\u8bfb&#xff09;&#xff08;\u5bf9\u5e94\u5b58\u50a8\u533a 0&#xff09;&#xff0c;\u6216 0xA2&#xff08;\u5199&#xff09;\/ 0xA3&#xff08;\u8bfb&#xff09;&#xff08;\u5bf9\u5e94\u5b58\u50a8\u533a 1&#xff09;&#xff0c;\u5177\u4f53\u53d6\u51b3\u4e8e A2\u3001A1 \u5f15\u811a\u7684\u63a5\u6cd5\u3002<\/p>\n<h4>4.3 \u5199\u64cd\u4f5c\u65f6\u5e8f<\/h4>\n<p>FM24CL04 \u7684\u5199\u64cd\u4f5c\u4e0e\u6807\u51c6 IIC EEPROM \u7c7b\u4f3c&#xff0c;\u4f46\u65e0\u9700\u7b49\u5f85\u5185\u90e8\u5199\u5468\u671f\u3002\u5177\u4f53\u6d41\u7a0b\u5982\u4e0b&#xff1a;<\/p>\n<li>\u4e3b\u673a\u53d1\u9001\u8d77\u59cb\u6761\u4ef6&#xff08;START&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u4ece\u673a\u5730\u5740 &#043; \u5199\u6807\u5fd7&#xff08;\u5982 0xA0&#xff09;\u3002<\/li>\n<li>\u4ece\u673a\u8fd4\u56de\u5e94\u7b54\u4f4d&#xff08;ACK&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u5b57\u8282\u5730\u5740&#xff08;0x00 ~ 0xFF&#xff0c;\u5bf9\u5e94\u6240\u9009\u5b58\u50a8\u533a\u5185\u7684\u5730\u5740&#xff09;\u3002<\/li>\n<li>\u4ece\u673a\u8fd4\u56de\u5e94\u7b54\u4f4d&#xff08;ACK&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u6570\u636e\u5b57\u8282&#xff0c;\u6bcf\u5b57\u8282\u540e\u4ece\u673a\u8fd4\u56de ACK\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u505c\u6b62\u6761\u4ef6&#xff08;STOP&#xff09;&#xff0c;\u5199\u5165\u5b8c\u6210\u3002<\/li>\n<p>\u7531\u4e8e FRAM \u65e0\u9700\u5199\u5468\u671f&#xff0c;\u4e3b\u673a\u53ef\u4ee5\u5728\u53d1\u9001 STOP \u540e\u7acb\u5373\u53d1\u8d77\u4e0b\u4e00\u6b21\u8bfb\u5199\u64cd\u4f5c&#xff0c;\u65e0\u9700\u50cf\u4f20\u7edf EEPROM \u90a3\u6837\u8f6e\u8be2 ACK \u6216\u7b49\u5f85\u5ef6\u65f6\u3002<\/p>\n<h4>4.4 \u8bfb\u64cd\u4f5c\u65f6\u5e8f<\/h4>\n<p>FM24CL04 \u652f\u6301\u4e24\u79cd\u8bfb\u64cd\u4f5c\u65b9\u5f0f&#xff1a;\u5f53\u524d\u5730\u5740\u8bfb\u548c\u968f\u673a\u5730\u5740\u8bfb\u3002<\/p>\n<p>\u968f\u673a\u5730\u5740\u8bfb\u6d41\u7a0b&#xff1a;<\/p>\n<li>\u4e3b\u673a\u53d1\u9001\u8d77\u59cb\u6761\u4ef6&#xff08;START&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u4ece\u673a\u5730\u5740 &#043; \u5199\u6807\u5fd7&#xff08;\u5982 0xA0&#xff09;\u3002<\/li>\n<li>\u4ece\u673a\u8fd4\u56de\u5e94\u7b54\u4f4d&#xff08;ACK&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u5b57\u8282\u5730\u5740&#xff08;\u76ee\u6807\u8bfb\u53d6\u5730\u5740&#xff09;\u3002<\/li>\n<li>\u4ece\u673a\u8fd4\u56de\u5e94\u7b54\u4f4d&#xff08;ACK&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u91cd\u65b0\u53d1\u9001\u8d77\u59cb\u6761\u4ef6&#xff08;\u91cd\u590d\u8d77\u59cb\u6761\u4ef6&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u4ece\u673a\u5730\u5740 &#043; \u8bfb\u6807\u5fd7&#xff08;\u5982 0xA1&#xff09;\u3002<\/li>\n<li>\u4ece\u673a\u8fd4\u56de\u5e94\u7b54\u4f4d&#xff08;ACK&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u8bfb\u53d6\u6570\u636e\u5b57\u8282&#xff0c;\u6bcf\u5b57\u8282\u540e\u4e3b\u673a\u53d1\u9001 ACK&#xff08;\u9664\u6700\u540e\u4e00\u5b57\u8282\u53d1\u9001 NACK&#xff09;\u3002<\/li>\n<li>\u4e3b\u673a\u53d1\u9001\u505c\u6b62\u6761\u4ef6&#xff08;STOP&#xff09;&#xff0c;\u8bfb\u53d6\u5b8c\u6210\u3002<\/li>\n<h4>4.5 \u4e0e STM32 \u7684\u786c\u4ef6\u8fde\u63a5<\/h4>\n<p>FM24CL04 \u4e0e STM32 \u7684\u8fde\u63a5\u975e\u5e38\u7b80\u5355&#xff0c;\u53ea\u9700\u4e24\u6839 IIC \u4fe1\u53f7\u7ebf\u52a0\u4e0a\u62c9\u7535\u963b&#xff1a;<\/p>\n<ul>\n<li>SDA&#xff1a;\u8fde\u63a5\u5230 STM32 \u7684 IIC \u6570\u636e\u5f15\u811a&#xff08;\u5982 PB7&#xff09;\u3002<\/li>\n<li>SCL&#xff1a;\u8fde\u63a5\u5230 STM32 \u7684 IIC \u65f6\u949f\u5f15\u811a&#xff08;\u5982 PB6&#xff09;\u3002<\/li>\n<li>VCC&#xff1a;\u8fde\u63a5\u5230 3.3V \u7535\u6e90\u3002<\/li>\n<li>GND&#xff1a;\u8fde\u63a5\u5230\u5730\u3002<\/li>\n<li>WP&#xff1a;\u5199\u4fdd\u62a4\u5f15\u811a&#xff0c;\u63a5\u5730\u8868\u793a\u5141\u8bb8\u5199\u5165&#xff0c;\u63a5\u9ad8\u7535\u5e73\u8868\u793a\u5199\u4fdd\u62a4\u3002<\/li>\n<li>A2\u3001A1&#xff1a;\u5730\u5740\u5f15\u811a&#xff0c;\u901a\u5e38\u63a5\u5730\u3002<\/li>\n<\/ul>\n<p>SDA \u548c SCL \u9700\u8981\u5916\u63a5\u4e0a\u62c9\u7535\u963b&#xff08;\u5178\u578b\u503c 4.7k\u03a9&#xff09;&#xff0c;\u4e0e STM32 \u7684 IIC \u5916\u8bbe\u6216\u8f6f\u4ef6\u6a21\u62df IIC \u914d\u5408\u4f7f\u7528\u3002<\/p>\n<h4>4.6 \u5e94\u7528\u573a\u666f<\/h4>\n<p>FM24CL04 \u51ed\u501f\u5176\u9ad8\u901f\u5199\u5165\u548c\u8d85\u957f\u5bff\u547d&#xff0c;\u5e7f\u6cdb\u5e94\u7528\u4e8e\u4ee5\u4e0b\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\u6570\u636e\u91c7\u96c6\u7cfb\u7edf&#xff1a;\u9891\u7e41\u8bb0\u5f55\u4f20\u611f\u5668\u6570\u636e&#xff0c;\u65e0\u9700\u62c5\u5fc3\u64e6\u5199\u5bff\u547d\u3002<\/li>\n<li>\u53c2\u6570\u5b58\u50a8&#xff1a;\u4fdd\u5b58\u7cfb\u7edf\u914d\u7f6e\u53c2\u6570\u3001\u6821\u51c6\u6570\u636e\u7b49\u3002<\/li>\n<li>\u6389\u7535\u4fdd\u62a4&#xff1a;\u5728\u7cfb\u7edf\u6389\u7535\u77ac\u95f4\u5feb\u901f\u4fdd\u5b58\u5173\u952e\u72b6\u6001\u3002<\/li>\n<li>\u65e5\u5fd7\u8bb0\u5f55&#xff1a;\u8bb0\u5f55\u8fd0\u884c\u65e5\u5fd7\u3001\u6545\u969c\u4fe1\u606f\u7b49\u3002<\/li>\n<\/ul>\n<h3>5. STM32F4xx I2C\u63a7\u5236\u5668<\/h3>\n<p>STM32F4xx\u7cfb\u5217\u5fae\u63a7\u5236\u5668\u5185\u7f6e\u4e86\u529f\u80fd\u5b8c\u5584\u7684I2C\u5916\u8bbe\u63a7\u5236\u5668&#xff0c;\u652f\u6301\u4e3b\u673a\u6a21\u5f0f\u548c\u4ece\u673a\u6a21\u5f0f&#xff0c;\u5177\u5907\u4e2d\u65ad\u3001DMA\u4f20\u8f93\u4ee5\u53ca\u591a\u4e3b\u673a\u4ef2\u88c1\u7b49\u9ad8\u7ea7\u7279\u6027\u3002\u672c\u8282\u5c06\u8be6\u7ec6\u4ecb\u7ecdSTM32F4xx I2C\u63a7\u5236\u5668\u7684\u5185\u90e8\u7ed3\u6784\u3001\u5bc4\u5b58\u5668\u914d\u7f6e\u4ee5\u53ca\u5b9e\u9645\u5e94\u7528\u65b9\u6cd5\u3002<\/p>\n<h4>5.1 I2C\u63a7\u5236\u5668\u5185\u90e8\u7ed3\u6784<\/h4>\n<p>STM32F4xx\u7684I2C\u5916\u8bbe\u4e3b\u8981\u7531\u4ee5\u4e0b\u529f\u80fd\u6a21\u5757\u7ec4\u6210&#xff1a;<\/p>\n<ul>\n<li>\u65f6\u949f\u63a7\u5236\u5355\u5143&#xff1a;\u8d1f\u8d23\u4ea7\u751fSCL\u65f6\u949f\u4fe1\u53f7&#xff0c;\u652f\u6301\u6807\u51c6\u6a21\u5f0f&#xff08;100kHz&#xff09;\u3001\u5feb\u901f\u6a21\u5f0f&#xff08;400kHz&#xff09;\u4ee5\u53ca\u5feb\u901f\u6a21\u5f0f&#043;&#xff08;1MHz&#xff09;\u3002<\/li>\n<li>\u6570\u636e\u79fb\u4f4d\u5bc4\u5b58\u5668&#xff1a;\u5b9e\u73b0SDA\u6570\u636e\u7684\u4e32\u884c\u53d1\u9001\u4e0e\u63a5\u6536&#xff0c;\u652f\u63017\u4f4d\u548c10\u4f4d\u5730\u5740\u6a21\u5f0f\u3002<\/li>\n<li>\u5730\u5740\u6bd4\u8f83\u5668&#xff1a;\u5728\u4ece\u673a\u6a21\u5f0f\u4e0b\u81ea\u52a8\u6bd4\u8f83\u63a5\u6536\u5230\u7684\u5730\u5740\u4e0e\u81ea\u8eab\u5730\u5740&#xff0c;\u5339\u914d\u65f6\u4ea7\u751f\u4e2d\u65ad\u3002<\/li>\n<li>\u72b6\u6001\u5bc4\u5b58\u5668&#xff1a;\u8bb0\u5f55\u901a\u4fe1\u8fc7\u7a0b\u4e2d\u7684\u5404\u79cd\u72b6\u6001\u6807\u5fd7&#xff0c;\u5982\u8d77\u59cb\u6761\u4ef6\u3001\u505c\u6b62\u6761\u4ef6\u3001\u5e94\u7b54\u72b6\u6001\u7b49\u3002<\/li>\n<li>\u63a7\u5236\u5bc4\u5b58\u5668&#xff1a;\u914d\u7f6eI2C\u7684\u5de5\u4f5c\u6a21\u5f0f\u3001\u4e2d\u65ad\u4f7f\u80fd\u3001DMA\u8bf7\u6c42\u7b49\u53c2\u6570\u3002<\/li>\n<li>\u6570\u636e\u5bc4\u5b58\u5668&#xff1a;\u7528\u4e8e\u8bfb\u5199\u5f85\u53d1\u9001\u6216\u5df2\u63a5\u6536\u7684\u6570\u636e\u5b57\u8282\u3002<\/li>\n<\/ul>\n<h4>5.2 I2C\u5f15\u811a\u914d\u7f6e<\/h4>\n<p>STM32F4xx\u7684I2C\u5916\u8bbe\u901a\u5e38\u53ef\u4ee5\u6620\u5c04\u5230\u591a\u4e2aGPIO\u5f15\u811a&#xff0c;\u4ee5I2C1\u4e3a\u4f8b&#xff0c;\u5176\u5f15\u811a\u6620\u5c04\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>I2C1_SCL&#xff1a;\u53ef\u6620\u5c04\u5230 PB6\u3001PB8 \u7b49\u5f15\u811a\u3002<\/li>\n<li>I2C1_SDA&#xff1a;\u53ef\u6620\u5c04\u5230 PB7\u3001PB9 \u7b49\u5f15\u811a\u3002<\/li>\n<li>I2C2_SCL&#xff1a;\u53ef\u6620\u5c04\u5230 PB10\u3001PF1 \u7b49\u5f15\u811a\u3002<\/li>\n<li>I2C2_SDA&#xff1a;\u53ef\u6620\u5c04\u5230 PB11\u3001PF0 \u7b49\u5f15\u811a\u3002<\/li>\n<li>I2C3_SCL&#xff1a;\u53ef\u6620\u5c04\u5230 PA8\u3001PH7 \u7b49\u5f15\u811a\u3002<\/li>\n<li>I2C3_SDA&#xff1a;\u53ef\u6620\u5c04\u5230 PC9\u3001PH8 \u7b49\u5f15\u811a\u3002<\/li>\n<\/ul>\n<p>\u5728\u4f7f\u7528I2C\u5916\u8bbe\u524d&#xff0c;\u9700\u8981\u5c06\u5bf9\u5e94\u7684GPIO\u5f15\u811a\u914d\u7f6e\u4e3a\u590d\u7528\u529f\u80fd&#xff08;AF&#xff09;\u6a21\u5f0f&#xff0c;\u5e76\u8bbe\u7f6e\u4e3a\u5f00\u6f0f\u8f93\u51fa\u3001\u5e26\u4e0a\u62c9\u7535\u963b\u3002\u4ee5I2C1\u4f7f\u7528PB6\u548cPB7\u4e3a\u4f8b&#xff0c;GPIO\u914d\u7f6e\u4ee3\u7801\u5982\u4e0b&#xff1a;<\/p>\n<p>\/\/ \u4f7f\u80fdGPIOB\u548cI2C1\u65f6\u949f<br \/>\nRCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);<br \/>\nRCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);<\/p>\n<p>\/\/ \u914d\u7f6ePB6\u4e3aSCL&#xff0c;PB7\u4e3aSDA&#xff0c;\u590d\u7528\u529f\u80fdAF4<br \/>\nGPIO_InitTypeDef GPIO_InitStructure;<br \/>\nGPIO_InitStructure.GPIO_Pin &#061; GPIO_Pin_6 | GPIO_Pin_7;<br \/>\nGPIO_InitStructure.GPIO_Mode &#061; GPIO_Mode_AF;<br \/>\nGPIO_InitStructure.GPIO_Speed &#061; GPIO_Speed_50MHz;<br \/>\nGPIO_InitStructure.GPIO_OType &#061; GPIO_OType_OpenDrain;<br \/>\nGPIO_InitStructure.GPIO_PuPd &#061; GPIO_PuPd_UP;<br \/>\nGPIO_Init(GPIOB, &amp;GPIO_InitStructure);<\/p>\n<p>\/\/ \u5c06PB6\u3001PB7\u8fde\u63a5\u5230I2C1\u7684\u590d\u7528\u529f\u80fd<br \/>\nGPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);<br \/>\nGPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);<\/p>\n<h4>5.3 I2C\u521d\u59cb\u5316\u914d\u7f6e<\/h4>\n<p>\u5b8c\u6210GPIO\u914d\u7f6e\u540e&#xff0c;\u9700\u8981\u5bf9I2C\u5916\u8bbe\u8fdb\u884c\u521d\u59cb\u5316&#xff0c;\u8bbe\u7f6e\u901a\u4fe1\u901f\u7387\u3001\u5730\u5740\u6a21\u5f0f\u7b49\u53c2\u6570\u3002\u4f7f\u7528\u6807\u51c6\u5916\u8bbe\u5e93\u7684\u521d\u59cb\u5316\u4ee3\u7801\u5982\u4e0b&#xff1a;<\/p>\n<p>I2C_InitTypeDef I2C_InitStructure;<\/p>\n<p>\/\/ I2C1\u914d\u7f6e\u4e3a\u5feb\u901f\u6a21\u5f0f&#xff0c;400kHz<br \/>\nI2C_InitStructure.I2C_Mode &#061; I2C_Mode_I2C;<br \/>\nI2C_InitStructure.I2C_DutyCycle &#061; I2C_DutyCycle_2;<br \/>\nI2C_InitStructure.I2C_OwnAddress &#061; 0x00;  \/\/ \u4e3b\u673a\u6a21\u5f0f&#xff0c;\u81ea\u8eab\u5730\u5740\u53ef\u8bbe\u4e3a0<br \/>\nI2C_InitStructure.I2C_Ack &#061; I2C_Ack_Enable;<br \/>\nI2C_InitStructure.I2C_AcknowledgedAddress &#061; I2C_AcknowledgedAddress_7bit;<br \/>\nI2C_InitStructure.I2C_ClockSpeed &#061; 400000;  \/\/ 400kHz<\/p>\n<p>I2C_Init(I2C1, &amp;I2C_InitStructure);<br \/>\nI2C_Cmd(I2C1, ENABLE);<\/p>\n<p>\u5728\u914d\u7f6eI2C\u65f6\u949f\u9891\u7387\u65f6&#xff0c;\u9700\u8981\u6ce8\u610fAPB1\u603b\u7ebf\u7684\u65f6\u949f\u9891\u7387\u3002I2C\u7684\u65f6\u949f\u7531APB1\u65f6\u949f\u5206\u9891\u5f97\u5230&#xff0c;\u8ba1\u7b97\u516c\u5f0f\u4e3a&#xff1a;<\/p>\n<p>\/\/ I2C\u65f6\u949f\u9891\u7387 &#061; APB1\u65f6\u949f\u9891\u7387 \/ (2 \u00d7 (CCR &#043; 1))&#xff0c;\u5feb\u901f\u6a21\u5f0f<br \/>\n\/\/ \u6216 I2C\u65f6\u949f\u9891\u7387 &#061; APB1\u65f6\u949f\u9891\u7387 \/ (2 \u00d7 CCR)&#xff0c;\u6807\u51c6\u6a21\u5f0f<\/p>\n<h4>5.4 \u4e3b\u673a\u53d1\u9001\u6570\u636e<\/h4>\n<p>\u4f5c\u4e3a\u4e3b\u673a\u53d1\u9001\u6570\u636e\u65f6&#xff0c;\u9700\u8981\u4f9d\u6b21\u5b8c\u6210\u8d77\u59cb\u6761\u4ef6\u3001\u53d1\u9001\u4ece\u673a\u5730\u5740\u3001\u53d1\u9001\u6570\u636e\u3001\u505c\u6b62\u6761\u4ef6\u7b49\u6b65\u9aa4\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5411FM24CL04\u5199\u5165\u6570\u636e\u7684\u5b8c\u6574\u793a\u4f8b&#xff1a;<\/p>\n<p>void I2C_WriteByte(uint8_t slaveAddr, uint8_t regAddr, uint8_t data)<br \/>\n{<br \/>\n    \/\/ \u53d1\u9001\u8d77\u59cb\u6761\u4ef6<br \/>\n    I2C_GenerateSTART(I2C1, ENABLE);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));<\/p>\n<p>    \/\/ \u53d1\u9001\u4ece\u673a\u5730\u5740 &#043; \u5199\u6807\u5fd7<br \/>\n    I2C_Send7bitAddress(I2C1, slaveAddr, I2C_Direction_Transmitter);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));<\/p>\n<p>    \/\/ \u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740<br \/>\n    I2C_SendData(I2C1, regAddr);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));<\/p>\n<p>    \/\/ \u53d1\u9001\u6570\u636e<br \/>\n    I2C_SendData(I2C1, data);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));<\/p>\n<p>    \/\/ \u53d1\u9001\u505c\u6b62\u6761\u4ef6<br \/>\n    I2C_GenerateSTOP(I2C1, ENABLE);<br \/>\n}<\/p>\n<h4>5.5 \u4e3b\u673a\u63a5\u6536\u6570\u636e<\/h4>\n<p>\u4e3b\u673a\u63a5\u6536\u6570\u636e\u65f6&#xff0c;\u9700\u8981\u5148\u53d1\u9001\u4ece\u673a\u5730\u5740\u548c\u5bc4\u5b58\u5668\u5730\u5740&#xff0c;\u7136\u540e\u91cd\u65b0\u53d1\u9001\u8d77\u59cb\u6761\u4ef6\u5e76\u5207\u6362\u4e3a\u63a5\u6536\u6a21\u5f0f\u3002\u4ee5\u4e0b\u662f\u4eceFM24CL04\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u7684\u793a\u4f8b&#xff1a;<\/p>\n<p>uint8_t I2C_ReadByte(uint8_t slaveAddr, uint8_t regAddr)<br \/>\n{<br \/>\n    uint8_t data &#061; 0;<\/p>\n<p>    \/\/ \u53d1\u9001\u8d77\u59cb\u6761\u4ef6<br \/>\n    I2C_GenerateSTART(I2C1, ENABLE);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));<\/p>\n<p>    \/\/ \u53d1\u9001\u4ece\u673a\u5730\u5740 &#043; \u5199\u6807\u5fd7&#xff08;\u5148\u5199\u5bc4\u5b58\u5668\u5730\u5740&#xff09;<br \/>\n    I2C_Send7bitAddress(I2C1, slaveAddr, I2C_Direction_Transmitter);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));<\/p>\n<p>    \/\/ \u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740<br \/>\n    I2C_SendData(I2C1, regAddr);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));<\/p>\n<p>    \/\/ \u91cd\u65b0\u53d1\u9001\u8d77\u59cb\u6761\u4ef6&#xff08;\u91cd\u590d\u8d77\u59cb&#xff09;<br \/>\n    I2C_GenerateSTART(I2C1, ENABLE);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));<\/p>\n<p>    \/\/ \u53d1\u9001\u4ece\u673a\u5730\u5740 &#043; \u8bfb\u6807\u5fd7<br \/>\n    I2C_Send7bitAddress(I2C1, slaveAddr, I2C_Direction_Receiver);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));<\/p>\n<p>    \/\/ \u8bfb\u53d6\u6570\u636e&#xff0c;\u53d1\u9001NACK\u540e\u505c\u6b62<br \/>\n    I2C_AcknowledgeConfig(I2C1, DISABLE);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));<br \/>\n    data &#061; I2C_ReceiveData(I2C1);<br \/>\n    I2C_GenerateSTOP(I2C1, ENABLE);<br \/>\n    I2C_AcknowledgeConfig(I2C1, ENABLE);<\/p>\n<p>    return data;<br \/>\n}<\/p>\n<h4>5.6 \u4f7f\u7528DMA\u8fdb\u884c\u6279\u91cf\u4f20\u8f93<\/h4>\n<p>\u5bf9\u4e8e\u5927\u91cf\u6570\u636e\u7684\u4f20\u8f93&#xff0c;\u4f7f\u7528DMA\u53ef\u4ee5\u663e\u8457\u964d\u4f4eCPU\u8d1f\u8f7d\u3002STM32F4xx\u7684I2C\u5916\u8bbe\u652f\u6301DMA\u8bf7\u6c42&#xff0c;\u914d\u7f6eDMA\u4f20\u8f93\u7684\u6b65\u9aa4\u5982\u4e0b&#xff1a;<\/p>\n<li>\u914d\u7f6eDMA\u901a\u9053&#xff0c;\u8bbe\u7f6e\u6570\u636e\u4f20\u8f93\u65b9\u5411\u3001\u6570\u636e\u5bbd\u5ea6\u548c\u4f20\u8f93\u6570\u91cf\u3002<\/li>\n<li>\u4f7f\u80fdI2C\u7684DMA\u8bf7\u6c42\u529f\u80fd\u3002<\/li>\n<li>\u542f\u52a8DMA\u4f20\u8f93&#xff0c;I2C\u4f1a\u81ea\u52a8\u89e6\u53d1DMA\u8bf7\u6c42\u3002<\/li>\n<li>\u4f20\u8f93\u5b8c\u6210\u540e&#xff0c;DMA\u4ea7\u751f\u4e2d\u65ad\u901a\u77e5CPU\u3002<\/li>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528DMA\u5411FM24CL04\u5199\u5165\u591a\u4e2a\u5b57\u8282\u7684\u793a\u4f8b&#xff1a;<\/p>\n<p>void I2C_DMA_Write(uint8_t slaveAddr, uint8_t regAddr, uint8_t *buffer, uint16_t len)<br \/>\n{<br \/>\n    \/\/ \u914d\u7f6eDMA1\u901a\u90536\u7528\u4e8eI2C1\u53d1\u9001<br \/>\n    DMA_InitTypeDef DMA_InitStructure;<br \/>\n    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);<\/p>\n<p>    DMA_InitStructure.DMA_Channel &#061; DMA_Channel_0;<br \/>\n    DMA_InitStructure.DMA_PeripheralBaseAddr &#061; (uint32_t)&amp;I2C1-&gt;DR;<br \/>\n    DMA_InitStructure.DMA_Memory0BaseAddr &#061; (uint32_t)buffer;<br \/>\n    DMA_InitStructure.DMA_DIR &#061; DMA_DIR_MemoryToPeripheral;<br \/>\n    DMA_InitStructure.DMA_BufferSize &#061; len;<br \/>\n    DMA_InitStructure.DMA_PeripheralInc &#061; DMA_PeripheralInc_Disable;<br \/>\n    DMA_InitStructure.DMA_MemoryInc &#061; DMA_MemoryInc_Enable;<br \/>\n    DMA_InitStructure.DMA_PeripheralDataSize &#061; DMA_PeripheralDataSize_Byte;<br \/>\n    DMA_InitStructure.DMA_MemoryDataSize &#061; DMA_MemoryDataSize_Byte;<br \/>\n    DMA_InitStructure.DMA_Mode &#061; DMA_Mode_Normal;<br \/>\n    DMA_InitStructure.DMA_Priority &#061; DMA_Priority_High;<br \/>\n    DMA_InitStructure.DMA_FIFOMode &#061; DMA_FIFOMode_Disable;<br \/>\n    DMA_Init(DMA1_Stream6, &amp;DMA_InitStructure);<\/p>\n<p>    \/\/ \u53d1\u9001\u8d77\u59cb\u6761\u4ef6\u548c\u4ece\u673a\u5730\u5740<br \/>\n    I2C_GenerateSTART(I2C1, ENABLE);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));<br \/>\n    I2C_Send7bitAddress(I2C1, slaveAddr, I2C_Direction_Transmitter);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));<\/p>\n<p>    \/\/ \u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740<br \/>\n    I2C_SendData(I2C1, regAddr);<br \/>\n    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));<\/p>\n<p>    \/\/ \u4f7f\u80fdDMA\u8bf7\u6c42\u5e76\u542f\u52a8\u4f20\u8f93<br \/>\n    I2C_DMACmd(I2C1, ENABLE);<br \/>\n    DMA_Cmd(DMA1_Stream6, ENABLE);<\/p>\n<p>    \/\/ \u7b49\u5f85\u4f20\u8f93\u5b8c\u6210<br \/>\n    while (!DMA_GetFlagStatus(DMA1_Stream6, DMA_FLAG_TCIF6));<br \/>\n    DMA_Cmd(DMA1_Stream6, DISABLE);<br \/>\n    I2C_DMACmd(I2C1, DISABLE);<\/p>\n<p>    \/\/ \u53d1\u9001\u505c\u6b62\u6761\u4ef6<br \/>\n    I2C_GenerateSTOP(I2C1, ENABLE);<br \/>\n}<\/p>\n<h4>5.7 \u72b6\u6001\u6807\u5fd7\u51fd\u6570<\/h4>\n<p>\u5728\u6807\u51c6\u5916\u8bbe\u5e93\u4e2d&#xff0c;I2C_GetFlagStatus \u548c I2C_ClearFlag \u662f\u7528\u4e8e\u67e5\u8be2\u548c\u6e05\u9664 I2C \u5916\u8bbe\u72b6\u6001\u6807\u5fd7\u7684\u4e24\u4e2a\u91cd\u8981\u51fd\u6570&#xff0c;\u5e38\u7528\u4e8e\u8f6e\u8be2\u65b9\u5f0f\u5224\u65ad\u901a\u4fe1\u72b6\u6001\u6216\u5904\u7406\u5f02\u5e38\u60c5\u51b5\u3002<\/p>\n<p>I2C_GetFlagStatus \u7528\u4e8e\u8bfb\u53d6 I2C \u5916\u8bbe\u7684\u6307\u5b9a\u72b6\u6001\u6807\u5fd7\u4f4d&#xff0c;\u5176\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p>FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG);<\/p>\n<p>\u8be5\u51fd\u6570\u8fd4\u56de SET \u6216 RESET&#xff0c;\u7528\u4e8e\u5224\u65ad\u5bf9\u5e94\u6807\u5fd7\u662f\u5426\u7f6e\u4f4d\u3002\u5e38\u7528\u6807\u5fd7\u5305\u62ec&#xff1a;<\/p>\n<ul>\n<li>I2C_FLAG_BUSY&#xff1a;\u603b\u7ebf\u5fd9\u6807\u5fd7&#xff0c;\u7f6e\u4f4d\u8868\u793a\u603b\u7ebf\u6b63\u5728\u901a\u4fe1\u3002<\/li>\n<li>I2C_FLAG_AF&#xff1a;\u5e94\u7b54\u5931\u8d25\u6807\u5fd7&#xff0c;\u7f6e\u4f4d\u8868\u793a\u4ece\u673a\u672a\u5e94\u7b54\u3002<\/li>\n<li>I2C_FLAG_BTF&#xff1a;\u5b57\u8282\u53d1\u9001\u5b8c\u6210\u6807\u5fd7&#xff0c;\u7f6e\u4f4d\u8868\u793a\u6570\u636e\u5bc4\u5b58\u5668\u5df2\u7a7a\u4e14\u79fb\u4f4d\u5bc4\u5b58\u5668\u5df2\u53d1\u9001\u5b8c\u6bd5\u3002<\/li>\n<li>I2C_FLAG_TXE&#xff1a;\u6570\u636e\u5bc4\u5b58\u5668\u7a7a\u6807\u5fd7&#xff0c;\u7f6e\u4f4d\u8868\u793a\u53ef\u4ee5\u5199\u5165\u4e0b\u4e00\u4e2a\u6570\u636e\u3002<\/li>\n<li>I2C_FLAG_RXNE&#xff1a;\u6570\u636e\u5bc4\u5b58\u5668\u975e\u7a7a\u6807\u5fd7&#xff0c;\u7f6e\u4f4d\u8868\u793a\u5df2\u63a5\u6536\u5230\u6570\u636e\u3002<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u793a\u4f8b&#xff1a;<\/p>\n<p>\/\/ \u7b49\u5f85\u6570\u636e\u53d1\u9001\u5b8c\u6210<br \/>\nwhile (I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF) &#061;&#061; RESET);<\/p>\n<p>\/\/ \u68c0\u67e5\u4ece\u673a\u662f\u5426\u5e94\u7b54<br \/>\nif (I2C_GetFlagStatus(I2C1, I2C_FLAG_AF) &#061;&#061; SET)<br \/>\n{<br \/>\n    \/\/ \u4ece\u673a\u65e0\u5e94\u7b54&#xff0c;\u5904\u7406\u9519\u8bef<br \/>\n}<\/p>\n<p>I2C_ClearFlag \u7528\u4e8e\u624b\u52a8\u6e05\u9664\u6307\u5b9a\u7684\u72b6\u6001\u6807\u5fd7\u4f4d&#xff0c;\u5176\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p>void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG);<\/p>\n<p>\u5f53\u901a\u4fe1\u5f02\u5e38\u5bfc\u81f4\u67d0\u4e9b\u6807\u5fd7&#xff08;\u5982\u5e94\u7b54\u5931\u8d25\u6807\u5fd7 AF\u3001\u603b\u7ebf\u9519\u8bef\u6807\u5fd7 BERR&#xff09;\u4e00\u76f4\u4fdd\u6301\u7f6e\u4f4d\u65f6&#xff0c;\u9700\u8981\u8c03\u7528\u8be5\u51fd\u6570\u6e05\u9664\u6807\u5fd7&#xff0c;\u4ee5\u4fbf\u6062\u590d\u6b63\u5e38\u901a\u4fe1\u3002\u4f7f\u7528\u793a\u4f8b&#xff1a;<\/p>\n<p>\/\/ \u6e05\u9664\u5e94\u7b54\u5931\u8d25\u6807\u5fd7<br \/>\nI2C_ClearFlag(I2C1, I2C_FLAG_AF);<\/p>\n<p>\/\/ \u6e05\u9664\u603b\u7ebf\u9519\u8bef\u6807\u5fd7<br \/>\nI2C_ClearFlag(I2C1, I2C_FLAG_BERR);<\/p>\n<p>\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d&#xff0c;\u5efa\u8bae\u5728\u6bcf\u6b21\u901a\u4fe1\u5f00\u59cb\u524d\u5148\u6e05\u9664\u76f8\u5173\u6807\u5fd7&#xff0c;\u907f\u514d\u4e0a\u4e00\u6b21\u901a\u4fe1\u9057\u7559\u7684\u6807\u5fd7\u5f71\u54cd\u672c\u6b21\u5224\u65ad&#xff1b;\u5728\u901a\u4fe1\u8fc7\u7a0b\u4e2d\u5219\u901a\u8fc7 I2C_GetFlagStatus \u8f6e\u8be2\u5173\u952e\u6807\u5fd7&#xff0c;\u786e\u4fdd\u6bcf\u4e00\u6b65\u64cd\u4f5c\u90fd\u6b63\u786e\u5b8c\u6210\u3002<\/p>\n<h4>5.8 \u5e38\u89c1\u95ee\u9898\u4e0e\u8c03\u8bd5\u6280\u5de7<\/h4>\n<p>\u5728\u4f7f\u7528STM32F4xx I2C\u63a7\u5236\u5668\u65f6&#xff0c;\u53ef\u80fd\u4f1a\u9047\u5230\u4ee5\u4e0b\u5e38\u89c1\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\u603b\u7ebf\u5fd9&#xff08;BUSY&#xff09;\u6807\u5fd7\u65e0\u6cd5\u6e05\u9664&#xff1a;\u5f53\u901a\u4fe1\u5f02\u5e38\u4e2d\u65ad\u65f6&#xff0c;I2C\u603b\u7ebf\u7684BUSY\u6807\u5fd7\u53ef\u80fd\u4e00\u76f4\u4fdd\u6301\u7f6e\u4f4d\u3002\u89e3\u51b3\u65b9\u6cd5\u662f\u5c06I2C\u5916\u8bbe\u590d\u4f4d&#xff08;I2C_SoftwareResetCmd&#xff09;&#xff0c;\u6216\u5207\u6362GPIO\u5f15\u811a\u7535\u5e73\u5f3a\u5236\u91ca\u653e\u603b\u7ebf\u3002<\/li>\n<li>SCL\u65f6\u949f\u9891\u7387\u4e0d\u51c6\u786e&#xff1a;\u68c0\u67e5APB1\u65f6\u949f\u9891\u7387\u914d\u7f6e\u662f\u5426\u6b63\u786e&#xff0c;\u4ee5\u53caCCR\u5bc4\u5b58\u5668\u7684\u5206\u9891\u503c\u662f\u5426\u8ba1\u7b97\u51c6\u786e\u3002<\/li>\n<li>\u4ece\u673a\u65e0\u5e94\u7b54&#xff08;NACK&#xff09;&#xff1a;\u68c0\u67e5\u4ece\u673a\u5730\u5740\u662f\u5426\u6b63\u786e\u3001\u4e0a\u62c9\u7535\u963b\u662f\u5426\u63a5\u597d\u3001\u4ece\u673a\u662f\u5426\u5904\u4e8e\u6b63\u5e38\u5de5\u4f5c\u72b6\u6001\u3002<\/li>\n<li>DMA\u4f20\u8f93\u6570\u636e\u9519\u4f4d&#xff1a;\u786e\u4fddDMA\u914d\u7f6e\u7684\u6570\u636e\u5bbd\u5ea6\u4e0eI2C\u6570\u636e\u5bc4\u5b58\u5668\u4e00\u81f4&#xff08;\u5747\u4e3a8\u4f4d&#xff09;&#xff0c;\u5e76\u6b63\u786e\u8bbe\u7f6e\u4f20\u8f93\u65b9\u5411\u3002<\/li>\n<li>\u4e2d\u65ad\u4f18\u5148\u7ea7\u51b2\u7a81&#xff1a;\u5f53I2C\u4e2d\u65ad\u4e0eDMA\u4e2d\u65ad\u540c\u65f6\u4f7f\u7528\u65f6&#xff0c;\u9700\u8981\u5408\u7406\u8bbe\u7f6eNVIC\u4f18\u5148\u7ea7&#xff0c;\u907f\u514d\u6570\u636e\u4e22\u5931\u3002<\/li>\n<\/ul>\n<p>\u8c03\u8bd5I2C\u901a\u4fe1\u65f6&#xff0c;\u5efa\u8bae\u4f7f\u7528\u903b\u8f91\u5206\u6790\u4eea\u6216\u793a\u6ce2\u5668\u89c2\u5bdfSDA\u548cSCL\u7684\u6ce2\u5f62&#xff0c;\u786e\u8ba4\u8d77\u59cb\u6761\u4ef6\u3001\u5730\u5740\u3001\u6570\u636e\u548c\u505c\u6b62\u6761\u4ef6\u662f\u5426\u7b26\u5408\u534f\u8bae\u8981\u6c42\u3002<\/p>\n<h4>5.9 \u8f6f\u4ef6\u6a21\u62df IIC \u793a\u4f8b&#xff08;GPIO \u4f4d\u64cd\u4f5c&#xff09;<\/h4>\n<p>\u9664\u4e86\u4f7f\u7528 STM32 \u786c\u4ef6 I2C \u5916\u8bbe\u5916&#xff0c;\u4e5f\u53ef\u4ee5\u901a\u8fc7 GPIO \u5f15\u811a\u624b\u52a8\u7ffb\u8f6c\u7535\u5e73\u6765\u8f6f\u4ef6\u6a21\u62df IIC \u65f6\u5e8f\u3002\u8fd9\u79cd\u65b9\u5f0f\u4e0d\u4f9d\u8d56\u82af\u7247\u5185\u90e8 I2C \u5916\u8bbe&#xff0c;\u517c\u5bb9\u6027\u66f4\u597d&#xff0c;\u5e38\u7528\u4e8e\u8c03\u8bd5\u6216\u5bf9\u65f6\u5e8f\u8981\u6c42\u4e0d\u9ad8\u7684\u573a\u666f\u3002\u4e0b\u9762\u7ed9\u51fa\u4e00\u4e2a\u5b8c\u6574\u7684\u8f6f\u4ef6\u6a21\u62df IIC \u8bfb\u5199\u793a\u4f8b\u3002<\/p>\n<p>\u9996\u5148\u5b9a\u4e49 SCL \u548c SDA \u5f15\u811a&#xff0c;\u5176\u4e2d SDA \u9700\u8981\u540c\u65f6\u652f\u6301\u8f93\u5165\u548c\u8f93\u51fa&#xff1a;<\/p>\n<p>#define SCL     PBout(8)<br \/>\n#define SDA_R   PBin(9)<br \/>\n#define SDA_W   PBout(9)<\/p>\n<p>\u8d77\u59cb\u6761\u4ef6&#xff1a;\u5728 SCL \u4fdd\u6301\u9ad8\u7535\u5e73\u671f\u95f4&#xff0c;SDA \u7531\u9ad8\u7535\u5e73\u8df3\u53d8\u4e3a\u4f4e\u7535\u5e73\u3002\u5efa\u7acb\u65f6\u95f4 Tsu \u81f3\u5c11\u4e3a 4.7us&#xff0c;\u4fdd\u6301\u65f6\u95f4 Thd \u81f3\u5c11\u4e3a 4.0us&#xff0c;\u56e0\u6b64\u5ef6\u65f6\u53d6 4us \u4ee5\u4e0a&#xff1a;<\/p>\n<p>void i2c_start(void)<br \/>\n{<br \/>\n    SCL &#061; 1;<br \/>\n    SDA_W &#061; 1;<br \/>\n    delay_us(4);<br \/>\n    SDA_W &#061; 0;<br \/>\n    delay_us(4);<br \/>\n}<\/p>\n<p>\u505c\u6b62\u6761\u4ef6&#xff1a;\u5728 SCL \u4fdd\u6301\u9ad8\u7535\u5e73\u671f\u95f4&#xff0c;SDA \u7531\u4f4e\u7535\u5e73\u8df3\u53d8\u4e3a\u9ad8\u7535\u5e73&#xff1a;<\/p>\n<p>void i2c_stop(void)<br \/>\n{<br \/>\n    SCL &#061; 0;<br \/>\n    SDA_W &#061; 0;<br \/>\n    delay_us(4);<br \/>\n    SCL &#061; 1;<br \/>\n    SDA_W &#061; 1;<br \/>\n    delay_us(4);<br \/>\n}<\/p>\n<p>\u4e3b\u673a\u53d1\u9001\u4e00\u4e2a\u5b57\u8282&#xff1a;\u6570\u636e\u5728 SCL \u4f4e\u7535\u5e73\u671f\u95f4\u53d8\u5316&#xff0c;\u5728 SCL \u9ad8\u7535\u5e73\u671f\u95f4\u4fdd\u6301\u7a33\u5b9a&#xff0c;\u4ece\u9ad8\u4f4d&#xff08;MSB&#xff09;\u5f00\u59cb\u9010\u4f4d\u53d1\u9001&#xff1a;<\/p>\n<p>void i2c_send_byte(uint8_t c)<br \/>\n{<br \/>\n    int i;<br \/>\n    SCL &#061; 0;              \/\/ \u62c9\u4f4e\u65f6\u949f\u7ebf&#xff0c;\u5141\u8bb8 SDA \u6539\u53d8<br \/>\n    delay_us(2);<br \/>\n    for (i &#061; 0; i &lt; 8; i&#043;&#043;)<br \/>\n    {<br \/>\n        SDA_W &#061; !!(c &amp; (1 &lt;&lt; (7 &#8211; i)));  \/\/ \u5148\u53d1\u9ad8\u4f4d<br \/>\n        delay_us(2);<br \/>\n        SCL &#061; 1;          \/\/ \u9501\u5b58\u6570\u636e&#xff0c;\u8ba9\u4ece\u673a\u53ef\u4ee5\u8bc6\u522b<br \/>\n        delay_us(2);<br \/>\n        SCL &#061; 0;<br \/>\n        delay_us(2);<br \/>\n    }<br \/>\n    SDA_W &#061; 1;            \/\/ \u4e00\u4e2a\u5b57\u8282\u53d1\u9001\u5b8c\u6bd5&#xff0c;\u91ca\u653e\u6570\u636e\u7ebf&#xff0c;\u7b49\u5f85\u5bf9\u65b9\u56de ACK<br \/>\n    delay_us(2);<br \/>\n}<\/p>\n<p>\u4e3b\u673a\u63a5\u6536\u4e00\u4e2a\u5b57\u8282&#xff1a;\u540c\u6837\u5728 SCL \u4f4e\u7535\u5e73\u671f\u95f4\u5141\u8bb8 SDA \u53d8\u5316&#xff0c;\u5728\u9ad8\u7535\u5e73\u671f\u95f4\u91c7\u6837\u8bfb\u53d6&#xff0c;\u4ece\u9ad8\u4f4d\u5f00\u59cb\u9010\u4f4d\u63a5\u6536&#xff1a;<\/p>\n<p>uint8_t i2c_recv_byte(void)<br \/>\n{<br \/>\n    uint8_t recv &#061; 0;<br \/>\n    int i;<br \/>\n    for (i &#061; 0; i &lt; 8; i&#043;&#043;)<br \/>\n    {<br \/>\n        SCL &#061; 0;          \/\/ \u53ea\u6709\u5728\u65f6\u949f\u7ebf\u4e3a\u4f4e\u7535\u5e73\u65f6&#xff0c;SDA \u624d\u80fd\u6539\u53d8<br \/>\n        delay_us(2);<\/p>\n<p>        SCL &#061; 1;          \/\/ \u65f6\u949f\u7ebf\u4e3a\u9ad8\u7535\u5e73&#xff0c;\u8ba9 SDA \u4fdd\u6301\u7a33\u5b9a<br \/>\n        delay_us(2);<\/p>\n<p>        recv |&#061; SDA_R &lt;&lt; (7 &#8211; i);  \/\/ \u5148\u63a5\u6536\u9ad8\u4f4d&#xff08;\u5927\u7aef\u5f0f&#xff09;<br \/>\n    }<br \/>\n    SCL &#061; 0;              \/\/ \u62c9\u4f4e\u65f6\u949f\u7ebf&#xff0c;\u5141\u8bb8\u5bf9\u65b9\u7ee7\u7eed\u53d1\u6570\u636e<br \/>\n    return recv;<br \/>\n}<\/p>\n<p>\u4e3b\u673a\u53d1\u9001\u5e94\u7b54\u4f4d&#xff08;ACK\/NACK&#xff09;&#xff1a;\u5728 SCL \u4f4e\u7535\u5e73\u671f\u95f4\u8bbe\u7f6e SDA \u7535\u5e73&#xff0c;\u9ad8\u7535\u5e73\u671f\u95f4\u9501\u5b58\u7ed9\u4ece\u673a\u8bc6\u522b&#xff1a;<\/p>\n<p>void i2c_ack(uint8_t ack)   \/\/ \u56de ACK<br \/>\n{<br \/>\n    SCL &#061; 0;<br \/>\n    delay_us(2);<br \/>\n    SDA_W &#061; ack;<br \/>\n    delay_us(2);<br \/>\n    SCL &#061; 1;<br \/>\n    delay_us(2);<br \/>\n    SCL &#061; 0;              \/\/ \u62c9\u4f4e\u65f6\u949f\u7ebf&#xff0c;\u5141\u8bb8\u5bf9\u65b9\u7ee7\u7eed\u53d1\u6570\u636e<br \/>\n}<\/p>\n<p>\u4e3b\u673a\u7b49\u5f85\u4ece\u673a\u5e94\u7b54&#xff1a;\u91ca\u653e SDA \u540e\u62c9\u9ad8 SCL&#xff0c;\u68c0\u6d4b SDA \u662f\u5426\u88ab\u4ece\u673a\u62c9\u4f4e&#xff08;ACK&#xff09;\u3002\u82e5\u8d85\u65f6\u672a\u5e94\u7b54&#xff0c;\u5219\u53d1\u9001\u505c\u6b62\u6761\u4ef6\u5e76\u8fd4\u56de\u9519\u8bef&#xff1a;<\/p>\n<p>uint8_t i2c_wait_ack(void)<br \/>\n{<br \/>\n    uint8_t timeout &#061; 0;<br \/>\n    SCL &#061; 1;              \/\/ \u9501\u5b58\u6570\u636e&#xff0c;\u4f7f SDA \u4fdd\u6301\u7a33\u5b9a<br \/>\n    delay_us(2);<br \/>\n    while (SDA_R)         \/\/ \u7b49\u5f85 SDA_R \u53d8\u4e3a 0<br \/>\n    {<br \/>\n        timeout&#043;&#043;;<br \/>\n        if (timeout &gt; 250)<br \/>\n        {<br \/>\n            i2c_stop();<br \/>\n            return 1;     \/\/ \u8d85\u65f6&#xff0c;\u4ece\u673a\u65e0\u5e94\u7b54<br \/>\n        }<br \/>\n    }<br \/>\n    SCL &#061; 0;              \/\/ \u62c9\u4f4e\u65f6\u949f\u7ebf&#xff0c;\u5141\u8bb8\u5bf9\u65b9\u7ee7\u7eed\u53d1\u6570\u636e<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u4ee5\u4ece\u673a\u5730\u5740 0b0101110&#xff08;7 \u4f4d\u5730\u5740&#xff09;\u4e3a\u4f8b&#xff0c;\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u65f6&#xff0c;\u4e3b\u673a\u5148\u53d1\u9001\u4ece\u673a\u5730\u5740 &#043; \u8bfb\u6807\u5fd7&#xff08;1&#xff09;&#xff0c;\u5373 0b0101110 1&#xff0c;\u968f\u540e\u7b49\u5f85\u4ece\u673a\u5e94\u7b54&#xff0c;\u518d\u9010\u4f4d\u8bfb\u53d6\u6570\u636e\u3002\u4e0a\u8ff0\u4ee3\u7801\u4e2d\u7684\u5ef6\u65f6\u53c2\u6570&#xff08;4us\u30012us&#xff09;\u5df2\u6ee1\u8db3\u6807\u51c6\u6a21\u5f0f 100kHz \u4e0b\u5efa\u7acb\u65f6\u95f4 Tsu \u2265 4.7us\u3001\u4fdd\u6301\u65f6\u95f4 Thd \u2265 4.0us\u3001\u6570\u636e\u6709\u6548\u65f6\u95f4 \u2265 3.4us \u7684\u65f6\u5e8f\u8981\u6c42\u3002<\/p>\n<h3>6. \u603b\u7ed3<\/h3>\n<p>\u672c\u6587\u56f4\u7ed5 STM32 \u7684 IIC \u901a\u4fe1\u5c55\u5f00&#xff0c;\u4ece\u534f\u8bae\u57fa\u7840\u5230\u5b9e\u9645\u5de5\u7a0b\u5e94\u7528\u8fdb\u884c\u4e86\u7cfb\u7edf\u68b3\u7406\u3002\u6838\u5fc3\u8981\u70b9\u53ef\u4ee5\u5f52\u7eb3\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762&#xff1a;<\/p>\n<ul>\n<li>\u534f\u8bae\u5c42\u9762&#xff1a;IIC \u662f\u4e24\u7ebf\u5236\u3001\u534a\u53cc\u5de5\u7684\u4e32\u884c\u901a\u4fe1\u603b\u7ebf&#xff0c;\u4ec5\u9700 SDA \u548c SCL \u4e24\u6839\u4fe1\u53f7\u7ebf\u3002\u901a\u4fe1\u8fc7\u7a0b\u7531\u8d77\u59cb\u6761\u4ef6&#xff08;START&#xff09;\u3001\u4ece\u673a\u5730\u5740\u3001\u5e94\u7b54\u4f4d&#xff08;ACK\/NACK&#xff09;\u3001\u6570\u636e\u5b57\u8282\u548c\u505c\u6b62\u6761\u4ef6&#xff08;STOP&#xff09;\u7ec4\u6210&#xff0c;\u6570\u636e\u5728 SCL \u9ad8\u7535\u5e73\u671f\u95f4\u4fdd\u6301\u7a33\u5b9a\u3001\u4f4e\u7535\u5e73\u671f\u95f4\u53d8\u5316\u3002<\/li>\n<li>\u5b9e\u73b0\u65b9\u5f0f&#xff1a;STM32 \u652f\u6301\u786c\u4ef6 IIC \u548c\u8f6f\u4ef6\u6a21\u62df IIC \u4e24\u79cd\u65b9\u6848\u3002\u786c\u4ef6 IIC \u7531\u82af\u7247\u5916\u8bbe\u81ea\u52a8\u5904\u7406\u65f6\u5e8f&#xff0c;CPU \u5360\u7528\u4f4e\u3001\u65f6\u5e8f\u7cbe\u786e&#xff0c;\u4f46\u914d\u7f6e\u590d\u6742\u4e14\u90e8\u5206\u578b\u53f7\u5b58\u5728\u517c\u5bb9\u6027\u95ee\u9898&#xff1b;\u8f6f\u4ef6\u6a21\u62df IIC \u901a\u8fc7 GPIO \u7ffb\u8f6c\u7535\u5e73\u5b9e\u73b0&#xff0c;\u7075\u6d3b\u901a\u7528&#xff0c;\u4f46\u5360\u7528 CPU \u8d44\u6e90\u8f83\u591a\u3002<\/li>\n<li>\u5178\u578b\u5668\u4ef6&#xff1a;\u4ee5 FM24CL04 \u94c1\u7535\u5b58\u50a8\u5668&#xff08;FRAM&#xff09;\u4e3a\u4f8b&#xff0c;\u5176\u91c7\u7528 IIC \u63a5\u53e3&#xff0c;\u5199\u5165\u65e0\u9700\u7b49\u5f85\u5199\u5468\u671f\u3001\u64e6\u5199\u5bff\u547d\u9ad8\u8fbe 10 \u4ebf\u6b21&#xff0c;\u975e\u5e38\u9002\u5408\u9891\u7e41\u8bfb\u5199\u548c\u6389\u7535\u4fdd\u62a4\u7b49\u573a\u666f\u3002\u5668\u4ef6\u5730\u5740\u4e3a 1010 A2 A1 A0&#xff0c;\u901a\u8fc7 A0 \u4f4d\u9009\u62e9\u4e24\u4e2a 256 \u5b57\u8282\u5b58\u50a8\u533a\u3002<\/li>\n<li>\u5de5\u7a0b\u5b9e\u8df5&#xff1a;STM32F4xx \u7684 I2C \u63a7\u5236\u5668\u652f\u6301\u4e3b\u673a\/\u4ece\u673a\u6a21\u5f0f\u3001\u4e2d\u65ad\u548c DMA \u4f20\u8f93\u3002\u5f00\u53d1\u65f6\u9700\u6b63\u786e\u914d\u7f6e GPIO \u590d\u7528\u529f\u80fd\u3001\u521d\u59cb\u5316 I2C \u5916\u8bbe&#xff0c;\u5e76\u901a\u8fc7 I2C_GetFlagStatus \u548c I2C_ClearFlag \u8f6e\u8be2\u4e0e\u6e05\u9664\u72b6\u6001\u6807\u5fd7&#xff0c;\u786e\u4fdd\u901a\u4fe1\u53ef\u9760\u3002<\/li>\n<li>\u8c03\u8bd5\u8981\u70b9&#xff1a;\u9047\u5230\u603b\u7ebf\u5fd9\u3001\u4ece\u673a\u65e0\u5e94\u7b54\u3001DMA \u6570\u636e\u9519\u4f4d\u7b49\u95ee\u9898\u65f6&#xff0c;\u5e94\u4f18\u5148\u68c0\u67e5\u5730\u5740\u3001\u4e0a\u62c9\u7535\u963b\u3001\u65f6\u949f\u5206\u9891\u548c\u4e2d\u65ad\u4f18\u5148\u7ea7&#xff0c;\u5e76\u501f\u52a9\u903b\u8f91\u5206\u6790\u4eea\u6216\u793a\u6ce2\u5668\u89c2\u5bdf SDA\/SCL \u6ce2\u5f62\u5b9a\u4f4d\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>\u603b\u4f53\u800c\u8a00&#xff0c;IIC \u534f\u8bae\u672c\u8eab\u5e76\u4e0d\u590d\u6742&#xff0c;\u96be\u70b9\u5728\u4e8e\u65f6\u5e8f\u63a7\u5236\u548c\u5f02\u5e38\u5904\u7406\u3002\u5efa\u8bae\u8bfb\u8005\u5148\u901a\u8fc7\u8f6f\u4ef6\u6a21\u62df IIC \u7406\u89e3\u534f\u8bae\u7ec6\u8282&#xff0c;\u518d\u5207\u6362\u5230\u786c\u4ef6 IIC \u63d0\u5347\u6548\u7387&#xff0c;\u5e76\u7ed3\u5408\u5b9e\u9645\u5668\u4ef6&#xff08;\u5982 FM24CL04&#xff09;\u5b8c\u6210\u8bfb\u5199\u9a8c\u8bc1&#xff0c;\u9010\u6b65\u638c\u63e1 STM32 \u7684 IIC \u5f00\u53d1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. 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