{"id":92016,"date":"2026-08-09T00:16:52","date_gmt":"2026-08-08T16:16:52","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/92016.html"},"modified":"2026-08-09T00:16:52","modified_gmt":"2026-08-08T16:16:52","slug":"90-%e6%a8%a1%e6%8b%9f-iic-%e9%80%9a%e4%bf%a1%e4%b8%ad-gpio-%e6%a8%a1%e5%bc%8f%e9%85%8d%e7%bd%ae%e7%9a%84%e5%85%b3%e9%94%ae%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e5%bc%80%e6%bc%8f%e8%be%93%e5%87%ba","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/92016.html","title":{"rendered":"90.\u6a21\u62df IIC \u901a\u4fe1\u4e2d GPIO \u6a21\u5f0f\u914d\u7f6e\u7684\u5173\u952e\uff1a\u4e3a\u4ec0\u4e48\u5f00\u6f0f\u8f93\u51fa\u662f\u5fc5\u987b\u7684\uff1f"},"content":{"rendered":"<p>\u5728\u5d4c\u5165\u5f0f\u5f00\u53d1\u4e2d&#xff0c;\u8f6f\u4ef6\u6a21\u62df IIC&#xff08;\u4e24\u7ebf\u4e32\u884c\u901a\u4fe1&#xff09;\u662f\u4e00\u9879\u5e38\u89c1\u9700\u6c42&#xff0c;\u6bd4\u5982\u8bfb\u53d6\u6e29\u5ea6\u4f20\u611f\u5668\u3001OLED \u5c4f\u5e55\u7b49\u5916\u8bbe\u3002\u4f46\u5f88\u591a\u5f00\u53d1\u8005\u4f1a\u9047\u5230\u4e00\u4e2a\u7ecf\u5178\u95ee\u9898&#xff1a;\u524d 8 \u4f4d\u6570\u636e\u4f20\u8f93\u6b63\u5e38&#xff0c;\u7b2c 9 \u4f4d\u5e94\u7b54&#xff08;ACK&#xff09;\u5374\u5f02\u5e38&#xff0c;\u6570\u636e\u7ebf\u5361\u5728\u4e2d\u95f4\u7535\u5e73&#xff0c;\u5bfc\u81f4\u901a\u4fe1\u5931\u8d25\u3002\u672c\u6587\u5c06\u7ed3\u5408\u5b9e\u9645\u6848\u4f8b&#xff0c;\u6df1\u5165\u5206\u6790\u8fd9\u4e2a\u95ee\u9898\u7684\u6839\u6e90&#xff0c;\u5e76\u63d0\u4f9b\u5b8c\u6574\u7684\u4ee3\u7801\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<h3>\u4e00\u3001\u95ee\u9898\u73b0\u8c61&#xff1a;\u524d 8 \u4f4d\u6b63\u5e38&#xff0c;\u7b2c 9 \u4f4d\u5e94\u7b54\u5f02\u5e38<\/h3>\n<p>\u6211\u4eec\u5148\u770b\u4e00\u4e2a\u5178\u578b\u7684\u6a21\u62df IIC \u6ce2\u5f62&#xff1a;<\/p>\n<ul>\n<li>SCL \u65f6\u949f\u4fe1\u53f7\u524d 8 \u4e2a\u5468\u671f\u6b63\u5e38<\/li>\n<li>SDA \u6570\u636e\u7ebf\u5728\u7b2c 9 \u4e2a\u5468\u671f&#xff08;\u5e94\u7b54\u4f4d&#xff09;\u5361\u5728 1.6V \u5de6\u53f3\u7684\u4e2d\u95f4\u7535\u5e73<\/li>\n<li>\u5355\u7247\u673a\u65e0\u6cd5\u91c7\u6837\u5230\u6709\u6548\u4f4e\u7535\u5e73&#xff0c;\u5224\u65ad\u4e3a NACK&#xff08;\u65e0\u5e94\u7b54&#xff09;<\/li>\n<\/ul>\n<p>\u4ece\u6ce2\u5f62\u53ef\u4ee5\u770b\u51fa&#xff0c;\u524d 8 \u4f4d\u6570\u636e\u4f20\u8f93\u6b63\u5e38&#xff0c;\u4f46\u7b2c 9 \u4f4d\u5e94\u7b54\u4f4d\u51fa\u73b0\u4e86\u7535\u5e73\u5f02\u5e38&#xff0c;\u8fd9\u662f\u5f88\u591a\u6a21\u62df IIC \u9879\u76ee\u4e2d\u5e38\u89c1\u7684 &#034;\u5751&#034;\u3002<\/p>\n<h3>\u4e8c\u3001\u95ee\u9898\u6839\u6e90&#xff1a;GPIO \u6a21\u5f0f\u914d\u7f6e\u9519\u8bef<\/h3>\n<h4>2.1 \u9519\u8bef\u7684\u914d\u7f6e&#xff1a;\u63a8\u633d\u8f93\u51fa<\/h4>\n<p>\u5f88\u591a\u5f00\u53d1\u8005\u5728\u914d\u7f6e\u6a21\u62df IIC \u65f6&#xff0c;\u4f1a\u5c06 SDA \u5f15\u811a\u914d\u7f6e\u4e3a\u63a8\u633d\u8f93\u51fa\u6a21\u5f0f\u3002\u63a8\u633d\u8f93\u51fa\u7684\u7279\u70b9\u662f&#xff1a;<\/p>\n<ul>\n<li>\u8f93\u51fa\u9ad8\u7535\u5e73\u65f6&#xff0c;\u7531\u5355\u7247\u673a\u5185\u90e8\u4e0a\u7ba1\u4e3b\u52a8\u63a8\u9ad8\u5230 VDD<\/li>\n<li>\u8f93\u51fa\u4f4e\u7535\u5e73\u65f6&#xff0c;\u7531\u5355\u7247\u673a\u5185\u90e8\u4e0b\u7ba1\u4e3b\u52a8\u62c9\u4f4e\u5230 GND<\/li>\n<\/ul>\n<p>\u5728\u6a21\u62df IIC \u7684\u5e94\u7b54\u9636\u6bb5&#xff0c;\u7a0b\u5e8f\u4f1a\u6267\u884cSDA &#061; 1;&#xff0c;\u610f\u56fe\u662f &#034;\u91ca\u653e&#034;SDA \u7ebf&#xff0c;\u8ba9\u4ece\u8bbe\u5907&#xff08;\u5982\u6e29\u5ea6\u4f20\u611f\u5668&#xff09;\u53ef\u4ee5\u62c9\u4f4e SDA \u6765\u53d1\u9001 ACK \u4fe1\u53f7\u3002\u4f46\u5728\u63a8\u633d\u8f93\u51fa\u6a21\u5f0f\u4e0b&#xff0c;SDA &#061; 1;\u5e76\u4e0d\u662f\u91ca\u653e\u603b\u7ebf&#xff0c;\u800c\u662f\u5355\u7247\u673a\u4e3b\u52a8\u5c06 SDA \u63a8\u9ad8\u5230 VDD\u3002<\/p>\n<h4>2.2 \u51b2\u7a81\u7684\u4ea7\u751f&#xff1a;\u63a8\u633d\u8f93\u51fa vs \u5f00\u6f0f\u8f93\u51fa<\/h4>\n<p>\u6b64\u65f6&#xff0c;\u4ece\u8bbe\u5907&#xff08;\u6e29\u5ea6\u4f20\u611f\u5668&#xff09;\u7684 SDA \u5f15\u811a\u901a\u5e38\u914d\u7f6e\u4e3a\u5f00\u6f0f\u8f93\u51fa\u6a21\u5f0f&#xff0c;\u5728\u5e94\u7b54\u65f6\u4f1a\u4e3b\u52a8\u62c9\u4f4e SDA \u7ebf\u3002\u8fd9\u5c31\u5bfc\u81f4\u4e86\u51b2\u7a81&#xff1a;<\/p>\n<ul>\n<li>\u5355\u7247\u673a\u63a8\u633d\u8f93\u51fa&#xff1a;\u4e3b\u52a8\u63a8\u9ad8 SDA \u5230 VDD<\/li>\n<li>\u4ece\u8bbe\u5907\u5f00\u6f0f\u8f93\u51fa&#xff1a;\u4e3b\u52a8\u62c9\u4f4e SDA \u5230 GND<\/li>\n<\/ul>\n<p>\u4e24\u4e2a\u8bbe\u5907 &#034;\u786c\u78b0\u786c&#034;&#xff0c;SDA \u7ebf\u7684\u7535\u5e73\u88ab\u62c9\u5230\u4e2d\u95f4\u503c&#xff08;\u5982 1.6V&#xff09;&#xff0c;\u65e2\u4e0d\u662f\u6709\u6548\u7684\u9ad8\u7535\u5e73\u4e5f\u4e0d\u662f\u6709\u6548\u7684\u4f4e\u7535\u5e73&#xff0c;\u5bfc\u81f4\u5355\u7247\u673a\u65e0\u6cd5\u91c7\u6837\u5230\u4ece\u8bbe\u5907\u7684\u5e94\u7b54\u4fe1\u53f7\u3002<\/p>\n<h3>\u4e09\u3001\u6b63\u786e\u7684\u89e3\u51b3\u65b9\u6848&#xff1a;\u5f00\u6f0f\u8f93\u51fa &#043; \u4e0a\u62c9\u7535\u963b<\/h3>\n<h4>3.1 \u5f00\u6f0f\u8f93\u51fa\u7684\u539f\u7406<\/h4>\n<p>\u5f00\u6f0f\u8f93\u51fa&#xff08;Open-Drain&#xff09;\u7684\u7279\u70b9\u662f&#xff1a;<\/p>\n<ul>\n<li>\u8f93\u51fa\u9ad8\u7535\u5e73\u65f6&#xff0c;\u5185\u90e8\u4e0a\u7ba1\u5173\u95ed&#xff0c;\u5f15\u811a\u5904\u4e8e\u9ad8\u963b\u6001&#xff0c;\u7531\u5916\u90e8\u4e0a\u62c9\u7535\u963b\u5c06\u7535\u5e73\u62c9\u5230 VDD<\/li>\n<li>\u8f93\u51fa\u4f4e\u7535\u5e73\u65f6&#xff0c;\u5185\u90e8\u4e0b\u7ba1\u5f00\u542f&#xff0c;\u5c06\u5f15\u811a\u62c9\u5230 GND<\/li>\n<\/ul>\n<p>\u5728\u6a21\u62df IIC \u4e2d&#xff0c;\u5f00\u6f0f\u8f93\u51fa\u662f\u5fc5\u987b\u7684&#xff0c;\u56e0\u4e3a&#xff1a;<\/p>\n<li>IIC \u603b\u7ebf\u5141\u8bb8\u591a\u4e2a\u8bbe\u5907\u5171\u4eab\u540c\u4e00\u603b\u7ebf&#xff0c;\u4efb\u4f55\u8bbe\u5907\u90fd\u53ef\u4ee5\u4e3b\u52a8\u62c9\u4f4e\u603b\u7ebf&#xff0c;\u4f46\u4e0d\u80fd\u5f3a\u5236\u9a71\u52a8\u9ad8\u7535\u5e73<\/li>\n<li>\u5f00\u6f0f\u8f93\u51fa\u53ef\u4ee5\u907f\u514d\u603b\u7ebf\u51b2\u7a81&#xff0c;\u786e\u4fdd\u53ea\u6709\u4e00\u4e2a\u8bbe\u5907\u5728\u62c9\u4f4e\u603b\u7ebf<\/li>\n<h4>3.2 \u5b8c\u6574\u7684\u4ee3\u7801\u5b9e\u73b0<\/h4>\n<p>\u4ee5\u4e0b\u662f\u57fa\u4e8e STM32 LL \u5e93\u7684\u6a21\u62df IIC \u5b8c\u6574\u4ee3\u7801\u793a\u4f8b&#xff0c;\u5305\u542b\u6b63\u786e\u7684 GPIO \u914d\u7f6e\u548c\u901a\u4fe1\u51fd\u6570&#xff1a;<\/p>\n<p>#include &#034;stm32f1xx_ll_bus.h&#034;<br \/>\n#include &#034;stm32f1xx_ll_gpio.h&#034;<br \/>\n#include &#034;stm32f1xx_ll_rcc.h&#034;<\/p>\n<p>\/\/ \u5b9a\u4e49IIC\u5f15\u811a&#xff08;\u6839\u636e\u5b9e\u9645\u786c\u4ef6\u4fee\u6539&#xff09;<br \/>\n#define IIC_SCL_PORT GPIOB<br \/>\n#define IIC_SCL_PIN  LL_GPIO_PIN_6<br \/>\n#define IIC_SDA_PORT GPIOB<br \/>\n#define IIC_SDA_PIN  LL_GPIO_PIN_7<\/p>\n<p>\/\/ \u5ef6\u65f6\u51fd\u6570&#xff08;\u6839\u636e\u7cfb\u7edf\u65f6\u949f\u8c03\u6574&#xff09;<br \/>\n#define IIC_DELAY_US(us) LL_mDelay(us)<\/p>\n<p>\/**<br \/>\n * &#064;brief \u521d\u59cb\u5316\u6a21\u62dfIIC\u7684GPIO\u5f15\u811a<br \/>\n * &#064;note \u5fc5\u987b\u914d\u7f6e\u4e3a\u5f00\u6f0f\u8f93\u51fa\u6a21\u5f0f&#xff0c;\u5916\u90e8\u6dfb\u52a04.7k\u03a9\u4e0a\u62c9\u7535\u963b<br \/>\n *\/<br \/>\nvoid IIC_GPIO_Init(void)<br \/>\n{<br \/>\n    \/\/ \u4f7f\u80fdGPIOB\u65f6\u949f<br \/>\n    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOB);<\/p>\n<p>    \/\/ \u914d\u7f6eSCL\u5f15\u811a\u4e3a\u5f00\u6f0f\u8f93\u51fa<br \/>\n    LL_GPIO_SetPinMode(IIC_SCL_PORT, IIC_SCL_PIN, LL_GPIO_MODE_OUTPUT);<br \/>\n    LL_GPIO_SetPinOutputType(IIC_SCL_PORT, IIC_SCL_PIN, LL_GPIO_OUTPUT_OPENDRAIN);<br \/>\n    LL_GPIO_SetPinSpeed(IIC_SCL_PORT, IIC_SCL_PIN, LL_GPIO_SPEED_FREQ_HIGH);<br \/>\n    LL_GPIO_SetPinPull(IIC_SCL_PORT, IIC_SCL_PIN, LL_GPIO_PULL_NO); \/\/ \u4f9d\u8d56\u5916\u90e8\u4e0a\u62c9<\/p>\n<p>    \/\/ \u914d\u7f6eSDA\u5f15\u811a\u4e3a\u5f00\u6f0f\u8f93\u51fa<br \/>\n    LL_GPIO_SetPinMode(IIC_SDA_PORT, IIC_SDA_PIN, LL_GPIO_MODE_OUTPUT);<br \/>\n    LL_GPIO_SetPinOutputType(IIC_SDA_PORT, IIC_SDA_PIN, LL_GPIO_OUTPUT_OPENDRAIN);<br \/>\n    LL_GPIO_SetPinSpeed(IIC_SDA_PORT, IIC_SDA_PIN, LL_GPIO_SPEED_FREQ_HIGH);<br \/>\n    LL_GPIO_SetPinPull(IIC_SDA_PORT, IIC_SDA_PIN, LL_GPIO_PULL_NO); \/\/ \u4f9d\u8d56\u5916\u90e8\u4e0a\u62c9<\/p>\n<p>    \/\/ \u521d\u59cb\u72b6\u6001&#xff1a;SCL\u548cSDA\u90fd\u4e3a\u9ad8\u7535\u5e73&#xff08;\u91ca\u653e\u603b\u7ebf&#xff09;<br \/>\n    LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n}<\/p>\n<p>\/**<br \/>\n * &#064;brief \u4ea7\u751fIIC\u8d77\u59cb\u4fe1\u53f7<br \/>\n *\/<br \/>\nvoid IIC_Start(void)<br \/>\n{<br \/>\n    \/\/ SDA\u62c9\u4f4e\u524d&#xff0c;SCL\u5fc5\u987b\u4e3a\u9ad8<br \/>\n    LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ SDA\u62c9\u4f4e&#xff0c;\u4ea7\u751f\u8d77\u59cb\u4fe1\u53f7<br \/>\n    LL_GPIO_ResetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ SCL\u62c9\u4f4e&#xff0c;\u51c6\u5907\u53d1\u9001\u6570\u636e<br \/>\n    LL_GPIO_ResetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<br \/>\n}<\/p>\n<p>\/**<br \/>\n * &#064;brief \u4ea7\u751fIIC\u505c\u6b62\u4fe1\u53f7<br \/>\n *\/<br \/>\nvoid IIC_Stop(void)<br \/>\n{<br \/>\n    \/\/ SDA\u62c9\u4f4e\u524d&#xff0c;SCL\u5fc5\u987b\u4e3a\u9ad8<br \/>\n    LL_GPIO_ResetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ SCL\u62c9\u9ad8<br \/>\n    LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ SDA\u62c9\u9ad8&#xff0c;\u4ea7\u751f\u505c\u6b62\u4fe1\u53f7<br \/>\n    LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(5);<br \/>\n}<\/p>\n<p>\/**<br \/>\n * &#064;brief \u53d1\u9001\u4e00\u4e2a\u5b57\u8282\u6570\u636e<br \/>\n * &#064;param data \u8981\u53d1\u9001\u7684\u6570\u636e<br \/>\n * &#064;return 0: \u6536\u5230ACK; 1: \u6536\u5230NACK<br \/>\n *\/<br \/>\nuint8_t IIC_SendByte(uint8_t data)<br \/>\n{<br \/>\n    uint8_t i, ack;<\/p>\n<p>    \/\/ \u4ece\u9ad8\u4f4d\u5230\u4f4e\u4f4d\u53d1\u90018\u4f4d\u6570\u636e<br \/>\n    for(i &#061; 0; i &lt; 8; i&#043;&#043;)<br \/>\n    {<br \/>\n        \/\/ \u62c9\u4f4eSCL&#xff0c;\u51c6\u5907\u8bbe\u7f6e\u6570\u636e<br \/>\n        LL_GPIO_ResetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n        IIC_DELAY_US(3);<\/p>\n<p>        \/\/ \u8bbe\u7f6eSDA\u7535\u5e73<br \/>\n        if(data &amp; 0x80)<br \/>\n        {<br \/>\n            LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n        }<br \/>\n        else<br \/>\n        {<br \/>\n            LL_GPIO_ResetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n        }<br \/>\n        data &lt;&lt;&#061; 1;<br \/>\n        IIC_DELAY_US(2);<\/p>\n<p>        \/\/ \u62c9\u9ad8SCL&#xff0c;\u8ba9\u4ece\u8bbe\u5907\u91c7\u6837\u6570\u636e<br \/>\n        LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n        IIC_DELAY_US(5);<br \/>\n    }<\/p>\n<p>    \/\/ \u63a5\u6536\u4ece\u8bbe\u5907\u5e94\u7b54<br \/>\n    \/\/ \u91ca\u653eSDA&#xff0c;\u8ba9\u4ece\u8bbe\u5907\u53ef\u4ee5\u62c9\u4f4e<br \/>\n    LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(2);<\/p>\n<p>    \/\/ \u62c9\u9ad8SCL&#xff0c;\u91c7\u6837\u5e94\u7b54\u4fe1\u53f7<br \/>\n    LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ \u8bfb\u53d6SDA\u7535\u5e73&#xff1a;0&#061;ACK, 1&#061;NACK<br \/>\n    ack &#061; LL_GPIO_IsInputPinSet(IIC_SDA_PORT, IIC_SDA_PIN);<\/p>\n<p>    \/\/ \u62c9\u4f4eSCL&#xff0c;\u51c6\u5907\u4e0b\u4e00\u6b21\u4f20\u8f93<br \/>\n    LL_GPIO_ResetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    return ack;<br \/>\n}<\/p>\n<p>\/**<br \/>\n * &#064;brief \u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u6570\u636e<br \/>\n * &#064;param ack 0: \u53d1\u9001ACK; 1: \u53d1\u9001NACK<br \/>\n * &#064;return \u8bfb\u53d6\u5230\u7684\u6570\u636e<br \/>\n *\/<br \/>\nuint8_t IIC_ReadByte(uint8_t ack)<br \/>\n{<br \/>\n    uint8_t i, data &#061; 0;<\/p>\n<p>    \/\/ \u91ca\u653eSDA&#xff0c;\u8ba9\u4ece\u8bbe\u5907\u53ef\u4ee5\u53d1\u9001\u6570\u636e<br \/>\n    LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(2);<\/p>\n<p>    \/\/ \u4ece\u9ad8\u4f4d\u5230\u4f4e\u4f4d\u8bfb\u53d68\u4f4d\u6570\u636e<br \/>\n    for(i &#061; 0; i &lt; 8; i&#043;&#043;)<br \/>\n    {<br \/>\n        \/\/ \u62c9\u4f4eSCL&#xff0c;\u51c6\u5907\u8bfb\u53d6\u6570\u636e<br \/>\n        LL_GPIO_ResetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n        IIC_DELAY_US(3);<\/p>\n<p>        \/\/ \u62c9\u9ad8SCL&#xff0c;\u91c7\u6837\u6570\u636e<br \/>\n        LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n        IIC_DELAY_US(5);<\/p>\n<p>        \/\/ \u8bfb\u53d6SDA\u7535\u5e73<br \/>\n        data &lt;&lt;&#061; 1;<br \/>\n        if(LL_GPIO_IsInputPinSet(IIC_SDA_PORT, IIC_SDA_PIN))<br \/>\n        {<br \/>\n            data |&#061; 0x01;<br \/>\n        }<br \/>\n        IIC_DELAY_US(2);<br \/>\n    }<\/p>\n<p>    \/\/ \u53d1\u9001\u5e94\u7b54\u4fe1\u53f7<br \/>\n    if(ack &#061;&#061; 0)<br \/>\n    {<br \/>\n        \/\/ \u53d1\u9001ACK&#xff1a;\u62c9\u4f4eSDA<br \/>\n        LL_GPIO_ResetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    }<br \/>\n    else<br \/>\n    {<br \/>\n        \/\/ \u53d1\u9001NACK&#xff1a;\u91ca\u653eSDA<br \/>\n        LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    }<br \/>\n    IIC_DELAY_US(2);<\/p>\n<p>    \/\/ \u62c9\u9ad8SCL&#xff0c;\u8ba9\u4ece\u8bbe\u5907\u91c7\u6837\u5e94\u7b54<br \/>\n    LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ \u62c9\u4f4eSCL&#xff0c;\u51c6\u5907\u4e0b\u4e00\u6b21\u4f20\u8f93<br \/>\n    LL_GPIO_ResetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ \u91ca\u653eSDA<br \/>\n    LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(2);<\/p>\n<p>    return data;<br \/>\n}<\/p>\n<p>\/**<br \/>\n * &#064;brief \u7b49\u5f85\u4ece\u8bbe\u5907\u5e94\u7b54<br \/>\n * &#064;return 0: \u6536\u5230ACK; 1: \u8d85\u65f6\u672a\u6536\u5230ACK<br \/>\n *\/<br \/>\nuint8_t IIC_WaitAck(void)<br \/>\n{<br \/>\n    uint8_t timeout &#061; 255;<\/p>\n<p>    \/\/ \u91ca\u653eSDA<br \/>\n    LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(2);<\/p>\n<p>    \/\/ \u62c9\u9ad8SCL<br \/>\n    LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ \u7b49\u5f85SDA\u88ab\u62c9\u4f4e<br \/>\n    while(LL_GPIO_IsInputPinSet(IIC_SDA_PORT, IIC_SDA_PIN))<br \/>\n    {<br \/>\n        timeout&#8211;;<br \/>\n        if(timeout &#061;&#061; 0)<br \/>\n        {<br \/>\n            IIC_Stop();<br \/>\n            return 1; \/\/ \u8d85\u65f6<br \/>\n        }<br \/>\n    }<\/p>\n<p>    \/\/ \u62c9\u4f4eSCL<br \/>\n    LL_GPIO_ResetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    return 0; \/\/ \u6536\u5230ACK<br \/>\n}<\/p>\n<p>\/**<br \/>\n * &#064;brief \u53d1\u9001ACK\u4fe1\u53f7<br \/>\n *\/<br \/>\nvoid IIC_SendAck(void)<br \/>\n{<br \/>\n    \/\/ \u62c9\u4f4eSDA<br \/>\n    LL_GPIO_ResetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(2);<\/p>\n<p>    \/\/ \u62c9\u9ad8SCL<br \/>\n    LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ \u62c9\u4f4eSCL<br \/>\n    LL_GPIO_ResetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ \u91ca\u653eSDA<br \/>\n    LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(2);<br \/>\n}<\/p>\n<p>\/**<br \/>\n * &#064;brief \u53d1\u9001NACK\u4fe1\u53f7<br \/>\n *\/<br \/>\nvoid IIC_SendNack(void)<br \/>\n{<br \/>\n    \/\/ \u91ca\u653eSDA<br \/>\n    LL_GPIO_SetOutputPin(IIC_SDA_PORT, IIC_SDA_PIN);<br \/>\n    IIC_DELAY_US(2);<\/p>\n<p>    \/\/ \u62c9\u9ad8SCL<br \/>\n    LL_GPIO_SetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<\/p>\n<p>    \/\/ \u62c9\u4f4eSCL<br \/>\n    LL_GPIO_ResetOutputPin(IIC_SCL_PORT, IIC_SCL_PIN);<br \/>\n    IIC_DELAY_US(5);<br \/>\n}<\/p>\n<h3>\u56db\u3001\u5176\u4ed6\u53ef\u80fd\u7684 NACK \u539f\u56e0\u6392\u67e5<\/h3>\n<p>\u867d\u7136 GPIO \u6a21\u5f0f\u914d\u7f6e\u9519\u8bef\u662f\u6700\u5e38\u89c1\u7684\u539f\u56e0&#xff0c;\u4f46\u6a21\u62df IIC \u901a\u4fe1\u5931\u8d25\u8fd8\u53ef\u80fd\u6709\u5176\u4ed6\u539f\u56e0&#xff1a;<\/p>\n<li>\u5730\u5740\u9519\u8bef&#xff1a;\u786e\u4fdd\u4ece\u8bbe\u5907\u5730\u5740\u6b63\u786e&#xff0c;\u5305\u62ec\u8bfb\u5199\u4f4d\u7684\u8bbe\u7f6e<\/li>\n<li>\u4f9b\u7535\u95ee\u9898&#xff1a;\u68c0\u67e5\u4ece\u8bbe\u5907\u4f9b\u7535\u662f\u5426\u6b63\u5e38&#xff0c;\u7535\u538b\u662f\u5426\u5728\u5141\u8bb8\u8303\u56f4\u5185<\/li>\n<li>\u4e0a\u62c9\u7535\u963b\u95ee\u9898&#xff1a;\u786e\u4fdd\u5916\u90e8\u4e0a\u62c9\u7535\u963b\u963b\u503c\u5408\u9002&#xff08;\u901a\u5e38 4.7k\u03a9&#xff09;&#xff0c;\u4e0d\u8981\u8fc7\u5927\u6216\u8fc7\u5c0f<\/li>\n<li>\u5f15\u811a\u590d\u7528\u95ee\u9898&#xff1a;\u786e\u4fdd IIC \u5f15\u811a\u6ca1\u6709\u88ab\u5176\u4ed6\u5916\u8bbe\u590d\u7528<\/li>\n<li>\u65f6\u5e8f\u95ee\u9898&#xff1a;\u786e\u4fdd\u5ef6\u65f6\u51fd\u6570\u6b63\u786e&#xff0c;\u901a\u4fe1\u901f\u7387\u5728\u4ece\u8bbe\u5907\u5141\u8bb8\u8303\u56f4\u5185<\/li>\n<h3>\u4e94\u3001\u603b\u7ed3<\/h3>\n<p>\u6a21\u62df IIC \u901a\u4fe1\u4e2d&#xff0c;GPIO \u6a21\u5f0f\u914d\u7f6e\u662f\u5173\u952e\u4e2d\u7684\u5173\u952e\u3002\u5fc5\u987b\u5c06 SDA \u548c SCL \u5f15\u811a\u914d\u7f6e\u4e3a\u5f00\u6f0f\u8f93\u51fa\u6a21\u5f0f&#xff0c;\u5e76\u6dfb\u52a0\u5916\u90e8\u4e0a\u62c9\u7535\u963b&#xff0c;\u8fd9\u6837\u624d\u80fd\u6b63\u786e\u5b9e\u73b0\u603b\u7ebf\u7684 &#034;\u91ca\u653e&#034; \u548c &#034;\u62c9\u4f4e&#034; \u64cd\u4f5c&#xff0c;\u907f\u514d\u603b\u7ebf\u51b2\u7a81\u5bfc\u81f4\u7684\u5e94\u7b54\u5f02\u5e38\u3002<\/p>\n<p>\u5e0c\u671b\u672c\u6587\u7684\u5206\u6790\u548c\u4ee3\u7801\u793a\u4f8b\u80fd\u5e2e\u52a9\u4f60\u89e3\u51b3\u6a21\u62df IIC \u901a\u4fe1\u4e2d\u7684\u5e38\u89c1\u95ee\u9898&#xff0c;\u8ba9\u4f60\u7684\u5d4c\u5165\u5f0f\u9879\u76ee\u66f4\u52a0\u7a33\u5b9a\u53ef\u9760\u3002<\/p>\n<p>\u5982\u679c\u4f60\u4e5f\u9047\u5230\u8fc7\u7c7b\u4f3c\u7684 IIC \u901a\u4fe1\u95ee\u9898&#xff0c;\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u7559\u8a00\u8ba8\u8bba&#xff01;<\/p>\n<p>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u5d4c\u5165\u5f0f\u5f00\u53d1\u4e2d&#xff0c;\u8f6f\u4ef6\u6a21\u62df IIC&#xff08;\u4e24\u7ebf\u4e32\u884c\u901a\u4fe1&#xff09;\u662f\u4e00\u9879\u5e38\u89c1\u9700\u6c42&#xff0c;\u6bd4\u5982\u8bfb\u53d6\u6e29\u5ea6\u4f20\u611f\u5668\u3001OLED \u5c4f\u5e55\u7b49\u5916\u8bbe\u3002\u4f46\u5f88\u591a\u5f00\u53d1\u8005\u4f1a\u9047\u5230\u4e00\u4e2a\u7ecf\u5178\u95ee\u9898&#xff1a;\u524d 8 \u4f4d\u6570\u636e\u4f20\u8f93\u6b63\u5e38&#xff0c;\u7b2c 9 \u4f4d\u5e94\u7b54&#xff08;ACK&#xff09;\u5374\u5f02\u5e38&#xff0c;\u6570\u636e\u7ebf\u5361\u5728\u4e2d\u95f4\u7535\u5e73&#xff0c;\u5bfc\u81f4\u901a\u4fe1\u5931\u8d25\u3002\u672c\u6587\u5c06\u7ed3\u5408\u5b9e\u9645\u6848\u4f8b&#xff0c;\u6df1\u5165\u5206\u6790\u8fd9\u4e2a\u95ee\u9898\u7684\u6839\u6e90&#xff0c;\u5e76\u63d0\u4f9b\u5b8c\u6574\u7684\u4ee3\u7801\u89e3\u51b3\u65b9\u6848\u3002\u4e00\u3001\u95ee\u9898\u73b0\u8c61&amp;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[174,217,270,269,190],"topic":[],"class_list":["post-92016","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-stm32","tag-270","tag-269","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>90.\u6a21\u62df IIC \u901a\u4fe1\u4e2d GPIO \u6a21\u5f0f\u914d\u7f6e\u7684\u5173\u952e\uff1a\u4e3a\u4ec0\u4e48\u5f00\u6f0f\u8f93\u51fa\u662f\u5fc5\u987b\u7684\uff1f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/92016.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"90.\u6a21\u62df IIC \u901a\u4fe1\u4e2d GPIO \u6a21\u5f0f\u914d\u7f6e\u7684\u5173\u952e\uff1a\u4e3a\u4ec0\u4e48\u5f00\u6f0f\u8f93\u51fa\u662f\u5fc5\u987b\u7684\uff1f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u5728\u5d4c\u5165\u5f0f\u5f00\u53d1\u4e2d&#xff0c;\u8f6f\u4ef6\u6a21\u62df IIC&#xff08;\u4e24\u7ebf\u4e32\u884c\u901a\u4fe1&#xff09;\u662f\u4e00\u9879\u5e38\u89c1\u9700\u6c42&#xff0c;\u6bd4\u5982\u8bfb\u53d6\u6e29\u5ea6\u4f20\u611f\u5668\u3001OLED \u5c4f\u5e55\u7b49\u5916\u8bbe\u3002\u4f46\u5f88\u591a\u5f00\u53d1\u8005\u4f1a\u9047\u5230\u4e00\u4e2a\u7ecf\u5178\u95ee\u9898&#xff1a;\u524d 8 \u4f4d\u6570\u636e\u4f20\u8f93\u6b63\u5e38&#xff0c;\u7b2c 9 \u4f4d\u5e94\u7b54&#xff08;ACK&#xff09;\u5374\u5f02\u5e38&#xff0c;\u6570\u636e\u7ebf\u5361\u5728\u4e2d\u95f4\u7535\u5e73&#xff0c;\u5bfc\u81f4\u901a\u4fe1\u5931\u8d25\u3002\u672c\u6587\u5c06\u7ed3\u5408\u5b9e\u9645\u6848\u4f8b&#xff0c;\u6df1\u5165\u5206\u6790\u8fd9\u4e2a\u95ee\u9898\u7684\u6839\u6e90&#xff0c;\u5e76\u63d0\u4f9b\u5b8c\u6574\u7684\u4ee3\u7801\u89e3\u51b3\u65b9\u6848\u3002\u4e00\u3001\u95ee\u9898\u73b0\u8c61&amp;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/92016.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta 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