{"id":38381,"date":"2025-05-20T09:18:31","date_gmt":"2025-05-20T01:18:31","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/38381.html"},"modified":"2025-05-20T09:18:31","modified_gmt":"2025-05-20T01:18:31","slug":"stm32-usart%e4%b8%b2%e5%8f%a3%e9%80%9a%e4%bf%a1%ef%bc%889%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/38381.html","title":{"rendered":"STM32-USART\u4e32\u53e3\u901a\u4fe1\uff089\uff09"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

\n

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1\u3001\u5b9a\u4e49\u548c\u529f\u80fd<\/p>\n

2\u3001\u786c\u4ef6\u7535\u8def<\/p>\n

3\u3001\u7535\u5e73\u6807\u51c6<\/p>\n

4\u3001\u4e32\u53e3\u53c2\u6570\u53ca\u65f6\u5e8f\u56fe<\/p>\n

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\n

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\"\"<\/p>\n

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\u4e8c\u3001\u4e32\u53e3\u901a\u4fe1\u4ecb\u7ecd<\/h2>\n

1\u3001\u5b9a\u4e49\u548c\u529f\u80fd<\/h3>\n

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51\u5355\u7247\u673a\u5185\u90e8\u81ea\u5e26UART（\u901a\u7528\u5f02\u6b65\u6536\u53d1\u5668），\u53ef\u5b9e\u73b0\u5355\u7247\u673a\u7684\u4e32\u53e3\u901a\u4fe1\u3002<\/p>\n

2\u3001\u786c\u4ef6\u7535\u8def<\/h3>\n

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TXD\u4e0eRXD\u8981\u4ea4\u53c9\u8fde\u63a5；<\/p>\n

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\"\"<\/p>\n

3\u3001\u7535\u5e73\u6807\u51c6<\/h3>\n

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（1）TTL\u7535\u5e73：+5V\u8868\u793a1，0V\u8868\u793a0；<\/p>\n

（2）RS232\u7535\u5e73：-3V ~ -15V\u8868\u793a1，+3V ~ +15V\u8868\u793a0；<\/p>\n

（3）RS485\u7535\u5e73：\u4e24\u7ebf\u7535\u538b\u5dee+2V ~ +6V\u8868\u793a1，-2V ~ -6V\u8868\u793a0（\u5dee\u5206\u4fe1\u53f7）\u3002 \u00a0<\/p>\n

4\u3001\u4e32\u53e3\u53c2\u6570\u53ca\u65f6\u5e8f\u56fe<\/h3>\n

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\"\"<\/p>\n

\"\"<\/p>\n

\u4e09\u3001USART\u4e32\u53e3\u5916\u8bbe<\/h2>\n

\u200b\u901a\u7528\u540c\u6b65\/\u5f02\u6b65\u6536\u53d1\u5668，\u7b80\u79f0USART（Universal Synchronous\/Asynchronous Receiver\/Transmitter），\u572851\u5355\u7247\u673a\u4e2d\u8fd8\u4f1a\u53ebUART，\u4e5f\u5c31\u662f\u901a\u7528\u5f02\u6b65\u6536\u53d1\u5668\u3002STM32\u4e2d\u8fd9\u4e2a\u540c\u6b65\u529f\u80fd\u7528\u7684\u5f88\u5c11，\u6240\u4ee5\u4e24\u8005\u533a\u522b\u4e0d\u5927\u3002<\/p>\n

USART\u662fSTM32\u5185\u90e8\u96c6\u6210\u7684\u786c\u4ef6\u5916\u8bbe，\u53ef\u6839\u636e\u6570\u636e\u5bc4\u5b58\u5668\u7684\u4e00\u4e2a\u5b57\u8282\u6570\u636e\u81ea\u52a8\u751f\u6210\u6570\u636e\u5e27\u65f6\u5e8f，\u4eceTX\u5f15\u811a\u53d1\u9001\u51fa\u53bb，\u4e5f\u53ef\u81ea\u52a8\u63a5\u6536RX\u5f15\u811a\u7684\u6570\u636e\u5e27\u65f6\u5e8f，\u62fc\u63a5\u4e3a\u4e00\u4e2a\u5b57\u8282\u6570\u636e，\u5b58\u653e\u5728\u6570\u636e\u5bc4\u5b58\u5668\u91cc\u3002<\/p>\n

USART\u81ea\u5e26\u6ce2\u7279\u7387\u53d1\u751f\u5668，\u6700\u9ad8\u8fbe4.5Mbits\/s，\u5b83\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a\u5206\u9891\u5668，\u901a\u8fc7APB2\u603b\u7ebf\u7ed9\u768472MHz\u7684\u9891\u7387，\u5bf9\u5176\u8fdb\u884c\u5206\u9891，\u5f97\u5230\u60f3\u8981\u7684\u6ce2\u7279\u7387\u65f6\u949f，\u6700\u540e\u5728\u8fd9\u4e2a\u65f6\u949f\u4e0b，\u8fdb\u884c\u6536\u53d1\u6570\u636e\u3002 \u6ce2\u7279\u7387\u4e00\u822c\u91c7\u75289600bits\/s\u3001115200bits\/s\u3002<\/p>\n

STM32\u4e2d\u7684\u4e32\u53e3\u901a\u4fe1\u53ef\u914d\u7f6e\u6570\u636e\u4f4d\u957f\u5ea6（8\/9），\u6570\u636e\u4f4d\u4e0d\u9700\u8981\u6821\u9a8c\u4f4d\u5c31\u662f8\u4f4d，\u52a0\u4e0a\u6821\u9a8c\u4f4d\u5c31\u662f9\u4f4d\u3002\u53ef\u9009\u6821\u9a8c\u4f4d（\u65e0\u6821\u9a8c\/\u5947\u6821\u9a8c\/\u5076\u6821\u9a8c）\u3002 \u505c\u6b62\u4f4d\u957f\u5ea6（0.5\/1\/1.5\/2），\u51b3\u5b9a\u4e86\u6570\u636e\u5e27\u7684\u95f4\u9694，\u4e00\u822c\u90fd\u662f\u91c7\u75281\u4f4d\u3002<\/p>\n

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STM32F103C8T6 USART\u8d44\u6e90： USART1\u3001 USART2\u3001 USART3\u3002<\/p>\n

\u56db\u3001USART\u6846\u56fe<\/h2>\n

\"\"<\/p>\n

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\u4e94\u3001USART\u57fa\u672c\u7ed3\u6784<\/h2>\n

\"\"<\/p>\n

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USART\u521d\u59cb\u5316\u6b65\u9aa4： （1）RCC\u5f00\u542f\u65f6\u949f，\u5305\u62ecUSART\u548cGPIO\u7684\u65f6\u949f； （2）GPIO\u521d\u59cb\u5316，\u628aTX\u914d\u7f6e\u6210\u590d\u7528\u8f93\u51fa，RX\u914d\u7f6e\u6210\u8f93\u5165； （3）\u914d\u7f6eUSART； （4）\u5982\u679c\u6709\u63a5\u6536\u6570\u636e，\u8fd8\u9700\u8981\u914d\u7f6e\u4e2d\u65ad，\u52a0\u4e0aITconfig\u548cNVIC； （5）\u5f00\u542fUSART\u3002<\/p>\n<\/p>\n

\u516d\u3001\u4e32\u53e3\u6570\u636e\u5305\u7684\u6536\u53d1<\/h2>\n<\/p>\n

HEX\u6570\u636e\u5305\u548c\u6587\u672c\u6570\u636e\u5305<\/p>\n

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\"\"<\/p>\n

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\"\"<\/p>\n

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\"\"<\/p>\n

\u63a5\u6536HEX\u6570\u636e\u5305\u00a0<\/p>\n

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