{"id":766,"date":"2025-06-15T21:42:33","date_gmt":"2025-06-15T13:42:33","guid":{"rendered":"https:\/\/www.yanwenkai.com\/?p=766"},"modified":"2025-06-17T16:34:03","modified_gmt":"2025-06-17T08:34:03","slug":"%e7%ae%80%e5%8d%95%e4%bb%8b%e7%bb%8d%e4%b8%b2%e5%8f%a3%e3%80%81rs232%e3%80%81rs485%e5%9c%a8%e5%8d%95%e7%89%87%e6%9c%ba%e4%b8%8e%e5%b5%8c%e5%85%a5%e5%bc%8flinux%e7%b3%bb%e7%bb%9f%e4%b8%ad%e7%9a%84","status":"publish","type":"post","link":"https:\/\/www.yanwenkai.com\/?p=766","title":{"rendered":"\u7b80\u5355\u4ecb\u7ecd\u4e32\u53e3\u3001RS232\u3001RS485\u5728\u5355\u7247\u673a\u4e0e\u5d4c\u5165\u5f0flinux\u7cfb\u7edf\u4e2d\u7684\u4f7f\u7528"},"content":{"rendered":"

1 \u524d\u8a00<\/h1>\n

  \u4e32\u53e3\u901a\u4fe1\u534f\u8bae\u4e0espi\u3001i2c\u662f\u5d4c\u5165\u5f0f\u57fa\u7840\u76843\u4e2a\u901a\u4fe1\u534f\u8bae\u3002\u4e4b\u524d\u4ec5\u5728\u8c03\u8bd5\u8bbe\u5907\u65f6\u4f7f\u7528\u4e32\u53e3\u529f\u80fd\uff0c\u6ca1\u6df1\u5165\u4e86\u89e3\u8fc7\u4e32\u53e3\uff0c\u4ee5\u4e3a\u5c31\u662f\u4e2a\u7b80\u5355\u7684\u534f\u8bae\uff1b\u6700\u8fd1\u5de5\u4f5c\u7528\u5230\u4e86RS484\u534f\u8bae\u540e\uff0c\u7a0d\u5fae\u6df1\u5165\u4e86\u89e3\u4e86\u4e00\u4e0b\uff0c\u53d1\u73b0\u4e32\u53e3\u6d89\u53ca\u5230\u7684\u4e1c\u897f\u592a\u591a\u4e86\u3002\u4ece\u786c\u4ef6\u5230linux\u7cfb\u7edf\u7684\u6574\u4e2atty\u5b50\u7cfb\u7edf\u6846\u67b6\uff0c\u5230\u5e94\u7528\u5c42\u7684\u534f\u8bae\u5c01\u88c5\u53d1\u9001\uff0c\u592a\u591a\u592a\u7e41\u6742\u4e86\uff0c\u6df1\u5165\u8d77\u6765\u6beb\u65e0\u5934\u7eea\u3002\u8fd8\u597d\u5b83\u7684\u5165\u95e8\u77e5\u8bc6\u6781\u5176\u7b80\u5355\uff0c\u5e94\u7528\u5c42\u7684\u63a5\u53e3\u8d44\u6599\u5f88\u4e30\u5bcc\uff0c\u4f7f\u7528\u8d77\u6765\u5012\u662f\u6ca1\u90a3\u4e48\u9ebb\u70e6\u3002\u57fa\u4e8e\u6b64\uff0c\u6211\u6c47\u96c6\u524d\u4eba\u667a\u6167\u505a\u7bc7\u603b\u7ed3\u6587\u6863\u3002\u81f3\u4e8e\u590d\u6742\u7684tty\u5b50\u7cfb\u7edf\u8fd8\u662f\u5148\u653e\u4e00\u653e\u5427\uff0c\u7b49\u6211\u628a\u57fa\u4e8erv1106\u7684linux\u7684\u5361\u7247\u8ba1\u7b97\u673a\u505a\u51fa\u6765\u4ee5\u540e\uff0c\u57fa\u4e8e\u8fd9\u4e2a\u7cfb\u7edf\u4e13\u95e8\u7814\u7a76\u4e00\u4e0b\u4ece\u786c\u4ef6\u5230\u7cfb\u7edf\u5230\u9a71\u52a8\u5230\u5e94\u7528\u5c42\u7684\u4e32\u53e3\u5168\u6d41\u7a0b\u5b9e\u73b0\uff0c\u4e13\u95e8\u9488\u5bf9tty\u5b50\u7cfb\u7edf\u76f8\u5173\u7684\u6240\u6709\u4e1c\u897f\u641e\u51fa\u4e00\u7bc7\u535a\u5ba2\u6765\u3002<\/p>\n

2 \u603b\u7ebf\u76f8\u5173\u7684\u6982\u5ff5<\/h1>\n

2.1 \u4e32\u53e3\u603b\u7ebf\u76f8\u5173\u7684\u6982\u5ff5<\/h2>\n
\u603b\u7ebf \uff1a\u8fde\u63a5\u591a\u4e2a\u90e8\u4ef6\u7684\u4fe1\u606f\u4f20\u8f93\u7ebf\uff0c\u662f\u5404\u90e8\u4ef6\u5171\u4eab\u7684\u4f20\u8f93\u4ecb\u8d28\u3002\nUART : \u901a\u7528\u7684\u5f02\u6b65\u63a5\u6536\u5668\u548c\u53d1\u9001\u5668\uff0c\u4e32\u53e3\u4e3b\u8981\u662f\u88ab\u7528\u6765\u5b9e\u73b0\u4e24\u4e2a\u8bbe\u5907\u4e4b\u95f4\u7684\u901a\u4fe1\u7684\u3002<\/code><\/pre>\n
2.2 \u4e32\u884c\u603b\u7ebf\u548c\u5e76\u884c\u603b\u7ebf<\/h2>\n
\u4e32\u884c\u901a\u4fe1 : \u6307\u7684\u662f\u540c\u4e00\u65f6\u523b\u53ea\u80fd\u6536\u6216\u53d1\u4e00\u4e2abit\u4f4d\u4fe1\u606f\u3002\u56e0\u6b64\u53ea\u75281\u6839\u4fe1\u53f7\u7ebf\u5373\u53ef\u3002\n\u5e76\u884c\u901a\u4fe1 : \u6307\u7684\u662f\u540c\u4e00\u65f6\u523b\u53ef\u4ee5\u6536\u6216\u53d1\u591a\u4e2abit\u4f4d\u7684\u4fe1\u606f\uff0c\u56e0\u6b64\u9700\u8981\u591a\u6839\u4fe1\u53f7\u7ebf\u624d\u884c \u3002<\/code><\/pre>\n

\n
<\/div>
\n<\/center><\/p>\n
  \u5728\u5b9e\u9645\u7684\u5f00\u53d1\u4e2d\u5177\u4f53\u4f7f\u7528\u7684\u662f\u4e32\u884c\u8fd8\u662f\u5e76\u884c\u6839\u636e\u5b9e\u9645\u7684\u9700\u8981\u8fdb\u884c\u9009\u62e9\u3002<\/p>\n
\u4e32\u884c\uff1aUART , IIC\uff0cSPI , USB\uff0c 485, CAN\n\u5e76\u884c\uff1a\u786c\u76d8\uff0c\u5185\u5b58\u6761\uff0cTF\u5361\uff0cSD\u5361\uff0cMIPS LCD, \u6444\u50cf\u5934<\/code><\/pre>\n
2.3 \u5355\u5de5\uff0c\u5168\u53cc\u5de5\uff0c\u534a\u53cc\u5de5\u603b\u7ebf<\/h2>\n
\u5355\u5de5 : \u8981\u4e48\u6536\uff0c\u8981\u4e48\u53d1\uff0c\u53ea\u80fd\u505a\u63a5\u6536\u8bbe\u5907\u6216\u8005\u53d1\u9001\u8bbe\u5907\u3002\n\u534a\u53cc\u5de5 : \u53ef\u4ee5\u6536\uff0c\u53ef\u4ee5\u53d1\uff0c\u4f46\u662f\u4e0d\u80fd\u540c\u65f6\u6536\u53d1\u3002\n\u5168\u53cc\u5de5 : \u53ef\u4ee5\u5728\u540c\u4e00\u65f6\u523b\u65e2\u63a5\u6536\uff0c\u53c8\u53d1\u9001\u3002<\/code><\/pre>\n

\n
<\/div>
\n<\/center><\/p>\n
\u534a\u53cc\u5de5\uff1aIIC, USB 2.0\uff0c485\uff0c CAN\n\u5168\u53cc\u5de5\uff1aUART, SPI\uff0cUSB3.0<\/code><\/pre>\n
2.4 \u540c\u6b65\u603b\u7ebf\u548c\u5f02\u6b65\u603b\u7ebf<\/h2>\n
  \u540c\u6b65\u901a\u4fe1: \u4e00\u822c\u60c5\u51b5\u4e0b\u540c\u6b65\u901a\u4fe1\u6307\u7684\u662f\u901a\u4fe1\u53cc\u65b9\u6839\u636e\u540c\u6b65\u4fe1\u53f7\u8fdb\u884c\u901a\u4fe1\u7684\u65b9\u5f0f\u3002<\/p>\n
\u6bd4\u5982\u901a\u4fe1\u53cc \u65b9\u6709\u4e00\u4e2a\u5171\u540c\u7684\u65f6\u949f\u4fe1\u53f7\uff0c\u5927\u5bb6\u6839\u636e\u65f6\u949f\u4fe1\u53f7\u7684\u53d8\u5316\u8fdb\u884c\u901a\u4fe1\u3002\n \u4e00\u4e2a\u65f6\u949f\u5468\u671f\u6536\u53d1\u4e00\u4e2abit\u4f4d\u7684\u6570\u636e\u3002<\/code><\/pre>\n

\n
<\/div>
\n<\/center><\/p>\n
  \u5f02\u6b65\u901a\u4fe1: \u662f\u6307\u6570\u636e\u4f20\u8f93\u901f\u5ea6\u5339\u914d\u4f9d\u8d56\u4e8e\u901a\u4fe1\u53cc\u65b9\u6709\u81ea\u5df1\u72ec\u7acb\u7684\u7cfb\u7edf \u65f6\u949f\uff0c\u5927\u5bb6\u7ea6\u5b9a\u597d\u901a\u4fe1\u7684\u901f\u5ea6\u3002<\/p>\n
\u5f02\u6b65\u901a\u4fe1\u4e0d\u9700\u8981\u540c\u6b65\u4fe1\u53f7\uff0c\u4f46\u662f\u5e76\u4e0d \u662f\u8bf4\u901a\u4fe1\u7684\u8fc7\u7a0b\u4e0d\u540c\u6b65\u3002<\/code><\/pre>\n

\n
<\/div>
\n<\/center><\/p>\n
2.5 \u4e32\u53e3\u603b\u7ebf\u7684\u786c\u4ef6\u8fde\u63a5<\/h2>\n

\n
<\/div>
\n<\/center><\/p>\n
  UART : \u901a\u7528\u7684\u5f02\u6b65\u4e32\u884c\u5168\u53cc\u5de5\u603b\u7ebf\u3002<\/p>\n
3 \u4e32\u53e3\u3001rs232\u3001rs485\u7684\u7b80\u5355\u4ecb\u7ecd<\/h1>\n
  \u57fa\u4e8e\u4e0a\u6587\uff0c\u6211\u4eec\u4e86\u89e3\u4e86\u57fa\u7840\u7684\u4e32\u53e3\u5de5\u4f5c\u65b9\u5f0f\u662f\u5f02\u6b65\u4e32\u884c\u5168\u53cc\u5de5\u603b\u7ebf\u3002\u5982\u4e0b\u662f\u5bf9\u4e32\u53e3\u901a\u4fe1\u534f\u8bae\u7684\u89e3\u91ca\uff0c\u540e\u9762\u5b66\u4e60\u540e\u53d1\u73b0\u65e0\u8bba\u662f\u662f\u4e32\u53e3\u8fd8\u662frs232\u6216\u662frs485\u843d\u5230\u6700\u5e95\u5c42\u90fd\u9075\u5faa\u57fa\u672c\u7684\u4e32\u53e3\u901a\u4fe1\u534f\u8bae\u3002<\/p>\n
3.1 \u4e32\u53e3\u603b\u7ebf\u7684\u901a\u4fe1\u534f\u8bae<\/h2>\n
  \u901a\u4fe1\u534f\u8bae\uff1a\u901a\u4fe1\u53cc\u65b9\u7ea6\u5b9a\u597d\u901a\u4fe1\u7684\u56fa\u5b9a\u7684\u683c\u5f0f\uff0c\u4e0d\u5982\u7ea6\u5b9a\u901a\u4fe1\u7684\u901f\u7387\uff0c\u5f00\u59cb\u901a\u4fe1\u548c\u7ed3\u675f\u901a\u4fe1\u7684\u6807\u5fd7\u3002
\n(\u5b66\u4e60\u4efb\u4f55\u4e00\u79cd\u603b\u7ebf\uff0c\u9996\u5148\u8981\u5b66\u4e60\u7684\u662f\u603b\u7ebf\u7684\u901a\u4fe1\u7684\u534f\u8bae\u3002)<\/p>\n

\n
<\/div>
\n<\/center><\/p>\n
    \n
  • \u8d77\u59cb\u4f4d\uff1a\u53d1\u9001\u5668\u7ed9\u63a5\u6536\u5668\u53d1\u9001\u6570\u636e\u7684\u5f00\u59cb\u4fe1\u53f7\uff1b<\/li>\n
  • \u6570\u636e\u4e3a\uff1a\u8981\u53d1\u9001\u7684\u6570\u636e\uff0c\u5148\u53d1\u9001\u4f4e\u4f4d\u5728\u53d1\u9001\u9ad8\u4f4d\uff1b<\/li>\n
  • \u6821\u9a8c\u4f4d\uff1a\u5947\u5076\u6821\u9a8c\u4f4d
    \n  \u5947\u6821\u9a8c\uff1a\u6570\u636e\u4f4d\u548c\u6821\u9a8c\u4f4d1\u7684\u4e2a\u6570\u4e4b\u548c\u4e3a\u5947\u6570\uff1b\u5982\u679c\u53d1\u9001\u7684\u6570\u636e\u4e3a0x55, \u6821\u9a8c\u4f4d\u81ea\u52a8\u88651\uff1b\u5982\u679c\u53d1\u9001\u7684\u6570\u636e\u4e3a0x51,\u6821\u9a8c\u4f4d\u81ea\u52a8\u88650.
    \n  \u5076\u6821\u9a8c\uff1a\u6570\u636e\u4f4d\u548c\u6821\u9a8c\u4f4d1\u7684\u4e2a\u6570\u4e4b\u548c\u4e3a\u5076\u6570\uff1b\u5982\u679c\u53d1\u9001\u7684\u6570\u636e\u4e3a0x55, \u6821\u9a8c\u4f4d\u81ea\u52a8\u88650\uff1b\u5982\u679c\u53d1\u9001\u7684\u6570\u636e\u4e3a0x51,\u6821\u9a8c\u4f4d\u81ea\u52a8\u88651.<\/li>\n
  • \u505c\u6b62\u4f4d\uff1a\u4e00\u5e27\u6570\u636e\u53d1\u9001\u7ed3\u675f\uff0c\u6821\u51c6\u65f6\u949f\u3002
    \n  \u4e3a\u4ec0\u4e48\u8981\u6821\u51c6\u65f6\u949f\uff1f\u4e32\u53e3\u91c7\u7528\u7684\u662f\u5f02\u6b65\u603b\u7ebf\uff0c\u5404\u81ea\u91c7\u7528\u5404\u81ea\u72ec\u7acb\u7684\u65f6\u949f\u6e90\uff0c\u867d\u7136\u8981\u6c42\u65f6\u949f\u7684\u9891\u7387\u4fdd\u6301\u4e00\u81f4\uff0c\u4f46\u662f\u65f6\u949f\u4e5f\u4f1a\u5b58\u5728\u4e00\u5b9a\u7684\u8bef\u5dee\uff0c\u518d\u53d1\u9001\u6570\u636e\u7684\u8fc7\u7a0b\u4e2d\u8bef\u5dee\u4f1a\u8fdb\u884c\u7d2f\u79ef\uff0c\u56e0\u6b64\u53d1\u9001\u4e00\u5e27\u6570\u636e\u7ed3\u675f\u4e4b\u540e\u9700\u8981\u6821\u51c6\u65f6\u949f\u3002<\/li>\n
  • \u6ce2\u7279\u7387\/\u6bd4\u7279\u7387\uff1a\u5355\u4f4dbps, 1s\u4e2d\u53d1\u9001\u6570\u636e\u7684bit\u4f4d\u6570\uff0c\u5e38\u7528\u7684\u6ce2\u7279\u7387\u4e3a115200bps\uff0c9600bps.<\/li>\n
  • 8N1 : 8\u4f4d\u6570\u636e\u4f4d\uff0c\u6ca1\u6709\u6821\u9a8c\u4f4d\uff0c1\u4e2a\u505c\u6b62\u4f4d\u3002
    \n

    \n
    <\/div>
    \n<\/center><\/li>\n<\/ul>\n
    3.2 \u4e32\u53e3\u7684\u7b80\u5355\u4ecb\u7ecd<\/h2>\n
      \u5982\u4e0b\u662f\u5178\u578b\u7684\u4e32\u53e3\u63a5\u7ebf\u793a\u610f\u56fe\u3002\u4e32\u53e3\u4e00\u822c3\u6839\u7ebf\uff0c\u5730\u7ebf\u662f\u57fa\u7840\uff0c\u4e3a\u4fe1\u53f7\u7535\u6d41\u63d0\u4f9b\u95ed\u5408\u56de\u8def\u3001\u6d88\u9664\u5171\u6a21\u5e72\u6270\u3001\u63d0\u4f9b\u7535\u4f4d\u57fa\u51c6\uff1btx\u548crx\u662f\u8bfb\u5199\u7ebf\uff0c\u63a5\u7ebf\u65b9\u5f0f\u5982\u4e0b\u6240\u793a\u4ea4\u53c9\u8fde\u63a5\uff0c\u8bfb\u5199\u4e92\u4e0d\u5f71\u54cd\uff0c\u6240\u4ee5\u5b83\u53ef\u4ee5\u540c\u65f6\u6536\u53d1\u662f\u5168\u53cc\u5de5\uff08\u6240\u4ee5\u901a\u4fe1\u7ebf\u8def\u9488\u5bf9\u67d0\u4e00\u65b9\u6765\u8bf4\uff0c\u53ef\u4ee5\u53ea\u6709\u4e00\u6761\u901a\u4fe1\u7ebf\u8def\uff0c\u53ea\u53d1\u9001\u4e0d\u63a5\u6536\uff0c\u6216\u8005\u53ea\u63a5\u6536\u4e0d\u53d1\u9001\uff1b\u4e5f\u53ef\u4ee5\u6709\u4e24\u6761\uff0c\u65e2\u53d1\u9001\u53c8\u63a5\u6536\uff09\uff1b\u53c8\u56e0\u4e3a\u6ca1\u6709\u65f6\u949f\u7ebf\uff0c\u6240\u4ee5\u4f20\u8f93\u65f6\u4f9d\u9760\u5404\u81ea\u8bbe\u5907\u7684\u65f6\u949f\u9891\u7387\uff0c\u662f\u5f02\u6b65\u603b\u7ebf\u3002\uff08\u56e0\u6b64\u53ea\u8981\u4fdd\u8bc1\u57fa\u7840\u7684\u914d\u7f6e\u53c2\u6570\u6ca1\u95ee\u9898\u5373\u53ef\u4f7f\u7528\u3002\uff09<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
      \u4e0b\u56fe\u662f\u4e32\u53e3\u6570\u636e\u53d1\u9001\u793a\u610f\u56fe\uff0c\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u65f6\u57df\u793a\u610f\u56fe\uff0c\u5c31\u662f\u4fe1\u53f7\u968f\u7740\u65f6\u95f4\u53d8\u5316\u7684\u5bf9\u5e94\u5173\u7cfb\u3002\u6bd4\u5982\u5728\u5355\u7247\u673a\u7684\u53d1\u9001\u5f15\u811a\u4e0a\uff0c\u5de6\u8fb9\u7684\u662f\u5148\u53d1\u751f\u7684\uff0c\u53f3\u8fb9\u7684\u662f\u540e\u53d1\u751f\u7684\uff0c\u6570\u636e\u4f4d\u7684\u5207\u6362\u65f6\u95f4\u5c31\u662f\u6ce2\u7279\u7387\u5206\u4e4b\u4e00\u79d2\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
      \u8981\u89c2\u5bdf\u5230\u5b9e\u9645\u7684\u4e32\u53e3\u901a\u4fe1\uff0c\u4e5f\u53ef\u4ee5\u7528\u903b\u8f91\u5206\u6790\u4eea\u6216\u8005\u793a\u6ce2\u5668\u7b49\u4eea\u5668\u6d4b\u91cf\u5355\u7247\u673a\u7684\u4e32\u53e3\u901a\u4fe1\uff0c\u5982\u4e0b\u56fe\u662f\u901a\u8fc7\u4e32\u53e3\u8c03\u8bd5\u52a9\u624b\u7ed9\u5355\u7247\u673a\u53d1\u9001\u4e86\u4e00\u4e2a0xE4\u6570\u636e\uff0c\u4f7f\u7528Kingst LA5016\u903b\u8f91\u5206\u6790\u4eea\u6d4b\u91cf\u7684\u4e00\u7ec4\u6ce2\u7279\u7387\u4e3a9600\u7684\u4e32\u53e3\u4fe1\u53f7\u3002\u4ece\u4e0b\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c\u5de6\u4fa7\u9996\u5148\u662f\u4e00\u4e2a\u8d77\u59cb\u4f4d\u4f4e\u7535\u5e73\uff08\u7eff\u5706\u70b9\u6807\u5fd7\uff09\uff0c\u7136\u540e\u662f8\u4f4d\u6570\u636e\uff08\u767d\u5706\u70b9\u6807\u5fd7\uff09\uff0c\u4f4e\u4f4d\u5728\u5de6\u8fb9\uff0c\u9ad8\u4f4d\u5728\u53f3\u8fb9\uff0c\u6700\u540e\u4e00\u4f4d\u505c\u6b62\u4f4d\uff08\u7ea2\u65b9\u70b9\u6807\u5fd7\uff09\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
    3.3 rs232\u7684\u7b80\u5355\u4ecb\u7ecd<\/h2>\n
      \u5728\u67d0\u4e9b\u5de5\u4e1a\u5e94\u7528\u573a\u666f\u4e0b\uff0c\u7ecf\u5e38\u4f1a\u9047\u52309\u9488\u7684\u4e32\u884c\u63a5\u53e3\uff0c\u8fd9\u4e2a\u4e32\u884c\u63a5\u53e3\u53eb\u505aRS232\u63a5\u53e3\u3002\u5728\u7269\u7406\u7ed3\u6784\u4e0a\u5206\u4e3a9\u9488\u7684\u548c9\u5b54\u7684\uff0c\u4e00\u822c\u79f0\u4e3a\u516c\u5934\u548c\u6bcd\u5934\uff0c\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
      RS232\u63a5\u53e3\u4e00\u5171\u67099\u4e2a\u5f15\u811a\uff0c\u5206\u522b\u5b9a\u4e49\u662f\uff1a1\u3001\u8f7d\u6ce2\u68c0\u6d4bDCD\uff1b2\u3001\u63a5\u6536\u6570\u636eRXD\uff1b3\u3001\u53d1\u9001\u6570\u636eTXD\uff1b4\u3001\u6570\u636e\u7ec8\u7aef\u51c6\u5907\u597dDTR\uff1b5\u3001\u4fe1\u53f7\u5730\u7ebfSG\uff1b6\u3001\u6570\u636e\u51c6\u5907\u597dDSR\uff1b7\u3001\u8bf7\u6c42\u53d1\u9001RTS\uff1b8\u3001\u6e05\u9664\u53d1\u9001CTS\uff1b9\u3001\u632f\u94c3\u63d0\u793aRI\u3002
    \n  \u8981\u8ba9\u8fd9\u4e2a\u4e32\u53e3\u4e0e\u5355\u7247\u673aUART\u901a\u4fe1\uff0c\u53ea\u9700\u8981\u5173\u5fc3\u5176\u4e2d\u76842\u811aRXD\u30013\u811aTXD\u548c5\u811aGND\u3002\u867d\u7136\u8fd9\u4e09\u4e2a\u5f15\u811a\u7684\u540d\u5b57\u4e0e\u5355\u7247\u673a\u4e0a\u7684\u4e32\u53e3\u540d\u5b57\u4e00\u6837\uff0c\u4f46\u662f\u4e0d\u80fd\u76f4\u63a5\u4e0e\u5355\u7247\u673a\u5bf9\u8fde\u901a\u4fe1\u3002\u5bf9\u4e8eRS232\u6807\u51c6\u6765\u8bf4\uff0c\u5b83\u662f\u4e2a\u53cd\u903b\u8f91\uff0c\u4e5f\u53eb\u505a\u8d1f\u903b\u8f91\u3002\u4e3a\u4f55\u53eb\u8d1f\u903b\u8f91\uff1f\u5b83\u7684TXD\u548cRXD\u7684\u7535\u538b\uff0c-3V\uff5e-15V\u7535\u538b\u4ee3\u8868\u662f1\uff0c+3\uff5e+15V\u7535\u538b\u4ee3\u8868\u662f0\u3002\u4f4e\u7535\u5e73\u4ee3\u8868\u7684\u662f1\uff0c\u800c\u9ad8\u7535\u5e73\u4ee3\u8868\u7684\u662f0\uff0c\u6240\u4ee5\u79f0\u4e4b\u4e3a\u8d1f\u903b\u8f91\u3002\u4f7f\u7528Kingst LA5016\u903b\u8f91\u5206\u6790\u4eea\u6d4b\u91cfRS232\u6ce2\u5f62\u5982\u56fe5\u6240\u793a\uff0c\u5728\u8d1f\u903b\u8f91\u7684\u914d\u7f6e\u4e0b\uff0c\u6ca1\u6709\u4fe1\u53f7\u7684\u65f6\u5019\u4e3a\u4f4e\u7535\u5e73\uff0c\u4e00\u4f4d\u9ad8\u4f4d\u8d77\u59cb\u4f4d\uff08\u7eff\u5706\u70b9\u6807\u5fd7\uff09\uff0c8\u4f4d\u6570\u636e\u4f4d\uff08\u767d\u5706\u70b9\u6807\u5fd7\uff09\uff0c1\u4f4d\u505c\u6b62\u4f4d\uff08\u7ea2\u65b9\u70b9\u6807\u5fd7\uff09\uff0c\u9ad8\u7535\u5e73\u4ee3\u8868\u20180\u2019\uff0c\u4f4e\u7535\u5e73\u4ee3\u8868\u20181\u2019\uff0c\u89e3\u6790\u7684\u6570\u636e\u662f0xE4\u3002
    \n  \u56e0\u4e3aRS232\u7535\u5e73\u662f\u8d1f\u903b\u8f91\uff0c\u4e14\u7535\u5e73\u503c\u53ef\u4ee5\u9ad8\u8fbe\u5341\u51e0V\uff0c\u800c\u901a\u5e38\u5355\u7247\u673a\u5f15\u811a\u662f\u517c\u5bb9\u7684TTL\u7535\u5e73\u6807\u51c6\u3002\u90a3\u4e48RS232\u63a5\u53e3\u60f3\u8981\u4e0e\u5355\u7247\u673a\u76f8\u8fde\u63a5\uff0c\u5c31\u9700\u8981\u7528\u4e00\u4e2a\u7535\u5e73\u8f6c\u6362\u82af\u7247(\u6bd4\u5982MAX232)\u6765\u5b8c\u6210\uff0c\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
      \u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u5e38\u4f1a\u9047\u5230\u677f\u5b50\u4e0a\u7684\u4e32\u53e3\u53ea\u5f15\u51fa\u4e86\u6700\u57fa\u672c\u76843\u6839\u7ebf\uff0c\u800c\u8c03\u8bd5\u65f6\u60f3\u8981\u4f7f\u7528\u4e5f\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\u5176\u6807\u51c6\u7684232\u63a5\u53e3\uff0c\u56e0\u6b64\u6700\u5e38\u4f7f\u7528\u7684\u5c31\u662f\u5982\u4e0b\u6240\u793a\u7684usb\u8f6c232\u4e32\u53e3\u7ebf\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
    3.4 rs485\u7684\u7b80\u5355\u4ecb\u7ecd<\/h2>\n
      \u5728\u5de5\u4e1a\u63a7\u5236\u3001\u7535\u529b\u901a\u8baf\u3001\u667a\u80fd\u4eea\u8868\u7b49\u9886\u57df\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\u662f\u91c7\u7528\u4e32\u53e3\u901a\u4fe1\u7684\u65b9\u5f0f\u8fdb\u884c\u6570\u636e\u4ea4\u6362\u3002\u6700\u521d\u91c7\u7528\u7684\u65b9\u5f0f\u662fRS232\u63a5\u53e3\uff0c\u7531\u4e8e\u5de5\u4e1a\u73b0\u573a\u6bd4\u8f83\u590d\u6742\uff0c\u5404\u79cd\u7535\u6c14\u8bbe\u5907\u4f1a\u5728\u73af\u5883\u4e2d\u4ea7\u751f\u6bd4\u8f83\u591a\u7684\u7535\u78c1\u5e72\u6270\uff0c\u4f1a\u5bfc\u81f4\u4fe1\u53f7\u4f20\u8f93\u9519\u8bef\u3002\u9664\u6b64\u4e4b\u5916\uff0cRS232\u63a5\u53e3\u53ea\u80fd\u5b9e\u73b0\u70b9\u5bf9\u70b9\u901a\u4fe1\uff0c\u4e0d\u5177\u5907\u8054\u7f51\u529f\u80fd\uff0c\u6700\u5927\u4f20\u8f93\u8ddd\u79bb\u4e5f\u53ea\u80fd\u8fbe\u5230\u5341\u51e0\u7c73\uff0c\u4e0d\u80fd\u6ee1\u8db3\u8fdc\u8ddd\u79bb\u901a\u4fe1\u8981\u6c42\u3002\u800cRS485\u5219\u89e3\u51b3\u4e86\u8fd9\u4e9b\u95ee\u9898\uff0c\u6570\u636e\u4fe1\u53f7\u91c7\u7528\u5dee\u5206\u4f20\u8f93\u65b9\u5f0f\uff0c\u53ef\u4ee5\u6709\u6548\u7684\u89e3\u51b3\u5171\u6a21\u5e72\u6270\u95ee\u9898\uff0c\u6700\u5927\u8ddd\u79bb\u53ef\u8fbe1200\u7c73\uff0c\u5e76\u4e14\u5141\u8bb8\u591a\u4e2a\u6536\u53d1\u8bbe\u5907\u63a5\u5230\u540c\u4e00\u6761\u603b\u7ebf\u4e0a\u3002
    \n  RS485\u91c7\u7528\u5dee\u5206\u4fe1\u53f7\u8fdb\u884c\u901a\u4fe1\uff0c\u603b\u7ebf\u75312\u6761\u7ebf\u7ec4\u6210\uff0c\u5206\u522b\u547d\u540d\u4e3aA\u548cB\uff0c\u5f53A\u7aef\u7535\u5e73\u5927\u4e8eB\u7aef\u7535\u5e73\u65f6\u4ee3\u88681\uff0cB\u7aef\u7535\u5e73\u5927\u4e8eA\u7aef\u7535\u5e73\u65f6\u4ee3\u88680\u3002\u6240\u4ee5RS485\u4e5f\u4e0d\u80fd\u76f4\u63a5\u4e0e\u5355\u7247\u673a\u5f15\u811a\u76f4\u63a5\u8fde\u63a5\uff0c\u800c\u662f\u9700\u8981\u4e13\u7528\u7684RS485\u8f6c\u63a5\u82af\u7247\u624d\u53ef\u4ee5\u4e0e\u5355\u7247\u673aUART\u63a5\u53e3\u8fde\u63a5\uff0c\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
      MAX485\u82af\u72475\u811a\u548c8\u811a\u662f\u7535\u6e90\u5f15\u811a\uff1b6\u811a\u548c7\u811a\u5c31\u662fRS485\u901a\u4fe1\u4e2d\u7684A\u548cB\u4e24\u4e2a\u5f15\u811a\uff1b1\u811a\u548c4\u811a\u5206\u522b\u63a5\u5230\u5355\u7247\u673a\u7684RXD\u548cTXD\u5f15\u811a\u4e0a\uff0c\u4f7f\u7528\u5355\u7247\u673aUART\u8fdb\u884c\u6570\u636e\u63a5\u6536\u548c\u53d1\u9001\uff1b2\u811a\u548c3\u811a\u662f\u65b9\u5411\u5f15\u811a\uff0c\u5176\u4e2d2\u811a\u662f\u4f4e\u7535\u5e73\u4f7f\u80fd\u63a5\u6536\u5668\uff0c3\u811a\u662f\u9ad8\u7535\u5e73\u4f7f\u80fd\u8f93\u51fa\u9a71\u52a8\u5668\uff0c\u53ef\u4ee5\u628a\u8fd9\u4e24\u4e2a\u5f15\u811a\u8fde\u5230\u4e00\u8d77\uff0c\u5e73\u65f6\u4e0d\u53d1\u9001\u6570\u636e\u7684\u65f6\u5019\uff0c\u4fdd\u6301\u8fd9\u4e24\u4e2a\u5f15\u811a\u662f\u4f4e\u7535\u5e73\uff0c\u8ba9MAX485\u5904\u4e8e\u63a5\u6536\u72b6\u6001\uff0c\u5f53\u9700\u8981\u53d1\u9001\u6570\u636e\u7684\u65f6\u5019\uff0c\u628a\u8fd9\u4e2a\u5f15\u811a\u62c9\u9ad8\uff0c\u53d1\u9001\u6570\u636e\uff0c\u53d1\u9001\u5b8c\u6bd5\u540e\u518d\u62c9\u4f4e\u8fd9\u4e2a\u5f15\u811a\u5c31\u53ef\u4ee5\u4e86\u3002\u4e3a\u4e86\u63d0\u9ad8RS485\u7684\u6297\u5e72\u6270\u80fd\u529b\uff0c\u901a\u5e38\u4f1a\u5728\u603b\u7ebf\u7684\u4e24\u7aef\uff0c\u5728A\u548cB\u4e4b\u95f4\u5e76\u63a5\u4e00\u4e2a120\u03a9\u7684\u7535\u963b\u3002
    \n  UART\u3001RS232\u3001RS485\u5728\u901a\u4fe1\u7684\u6570\u636e\u683c\u5f0f\u4e0a\u662f\u76f8\u540c\u7684\uff0c\u4e09\u8005\u533a\u522b\u4e3b\u8981\u662f\u903b\u8f91\u7535\u5e73\u7684\u5224\u5b9a\u65b9\u5f0f\u4e0d\u540c\u3002RS232\u4e0eRS485\u5728\u7ecf\u8fc7\u4e13\u7528\u7684\u7535\u5e73\u8f6c\u6362\u82af\u7247\u8f6c\u6210TTL\u7535\u5e73\u540e\u5c31\u4e0e\u6807\u51c6\u7684UART\u76f8\u540c\u4e86\uff0c\u53ef\u4ee5\u540c\u6837\u7531\u5355\u7247\u673a\u7684UART\u5916\u8bbe\u6765\u5b9e\u73b0\u901a\u4fe1\u6570\u636e\u7684\u6536\u53d1\u3002<\/p>\n
    4 \u57fa\u4e8e\u5355\u7247\u673a\u9a71\u52a8\u4e32\u53e3<\/h1>\n
    4.1 \u5206\u6790UART\u7684\u7535\u8def\u56fe<\/h2>\n
      \u8981\u5b9e\u73b0\u4e32\u53e3\u57fa\u672c\u529f\u80fd\u4e00\u822c\u4f1a\u5f15\u51fa2\u6839\u8bfb\u5199\u5f15\u811a\u5f15\u811a\uff0c\u5982\u4e0b\u662f\u60f3\u8981\u6700\u7ec8\u9a71\u52a8\u4e32\u53e3\u7684\u6574\u4f53\u903b\u8f91\u6d41\u7a0b\u3002
    \n\uff08\u591a\u529f\u80fd\u590d\u7528\u5f15\u811a\uff1a\u4e00\u4e2a\u5f15\u811a\u5177\u6709\u591a\u4e2a\u529f\u80fd\uff0c\u8fd9\u6837\u7684\u5f15\u811a\u5c31\u53eb\u505a\u591a\u529f\u80fd\u590d\u7528\u5f15\u811a\uff0c\u518d\u540c\u4e00\u65f6\u523b\u53ea\u80fd\u5c06\u5f15\u811a\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u529f\u80fd\u3002\u4e32\u53e3\u5b9e\u9a8c\u4f7f\u7528\u7684GPIO\u5f15\u811a\u5c31\u662f\u4f7f\u7528\u7684\u4e32\u53e3\u7684\u590d\u7528\u7684\u529f\u80fd\u3002\uff09<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
      \u5982\u4e0b\u662fpcd\u539f\u7406\u56fe\u4e2d\u5bf9\u5e94\u7684\u5f15\u811a\u7f16\u53f7\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center>
    \n

    \n
    <\/div>
    \n<\/center><\/p>\n
    4.2 \u5206\u6790\u82af\u7247\u624b\u518c<\/h2>\n
      \u5355\u7247\u673a\u7684\u4f7f\u7528\u6d41\u7a0b\u65e0\u5916\u4e4e\u8bfb\u6570\u636e\u624b\u518c\uff0c\u67e5\u770b\u76f8\u5173\u7684\u5bc4\u5b58\u5668\uff0c\u521d\u59cb\u5316\u5bc4\u5b58\u5668\u914d\u7f6e\uff0c\u5982\u4e0b\u662f\u5173\u4e8e\u4e32\u53e3\u7684\u5bc4\u5b58\u5668\u7684\u5206\u6790\u53ca\u53c2\u6570\u914d\u7f6e\u3002<\/p>\n
    4.2.1 \u5206\u67902.5.2\u7ae0\u8282<\/h3>\n
      \u786e\u5b9aRCC,GPIOB,GPIOG,UART4\u5916\u8bbe\u5206\u522b\u63a5\u5230\u54ea\u6839\u603b\u7ebf\u4e0a\uff0c\u4ee5\u53ca\u5916\u8bbe\u5bc4\u5b58\u5668\u5bf9\u5e94\u7684\u57fa\u5730\u5740\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center>
    \n

    \n
    <\/div>
    \n<\/center><\/p>\n
    4.2.2 \u5206\u6790RCC\u7ae0\u8282<\/h3>\n
      \u4f7f\u80fdGPIOB,GPIOG\u548cUART4\u5916\u8bbe\u7684\u65f6\u949f\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center>
    \n

    \n
    <\/div>
    \n<\/center><\/p>\n
    4.2.3 \u5206\u6790GPIO\u7ae0\u8282<\/h3>\n
      \u8bbe\u7f6e\u5f15\u811a\u4e3a\u4e32\u53e3\u529f\u80fd\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
    4.2.3.1 GPIOx_MODER\u5bc4\u5b58\u5668<\/h4>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
    4.2.3.2 GPIOx_AFRL\u5bc4\u5b58\u5668<\/h4>\n

    \n
    <\/div>
    \n<\/center>
    \n

    \n
    <\/div>
    \n<\/center>
    \n

    \n
    <\/div>
    \n<\/center><\/p>\n
    4.2.3.3 GPIOx_AFRH\u5bc4\u5b58\u5668<\/h4>\n

    \n
    <\/div>
    \n<\/center>
    \n

    \n
    <\/div>
    \n<\/center>
    \n

    \n
    <\/div>
    \n<\/center><\/p>\n
    4.2.4 \u5206\u6790UART4\u7ae0\u8282<\/h3>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
    4.2.4.1 USART_CR1\u5bc4\u5b58\u5668<\/h4>\n

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    <\/div>
    \n<\/center>
    \n

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    <\/div>
    \n<\/center>
    \n

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    \n<\/center>
    \n

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    <\/div>
    \n<\/center>
    \n

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    \n<\/center>
    \n

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    \n<\/center>
    \n

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    \n<\/center>
    \n

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    \n<\/center>
    \n

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    \n<\/center>
    \n

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    \n<\/center><\/p>\n
    4.2.4.2 USART_CR2\u5bc4\u5b58\u5668<\/h4>\n

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    <\/div>
    \n<\/center>
    \n

    \n
    <\/div>
    \n<\/center><\/p>\n
    4.2.4.3 USART_BRR\u5bc4\u5b58\u5668<\/h4>\n

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    <\/div>
    \n<\/center>
    \n

    \n
    <\/div>
    \n<\/center><\/p>\n
        \u5047\u8bbeusart_ker_ck_pres = 64Mhz, \u6ce2\u7279\u7387\u4e3a115200bps,\n\n    \u91c7\u6837\u7387\u4e3a16\u500d\uff0c \u5219USART_BRR[15:0] = 64000000 \/ 115200 = 555 = 0x22B\n\n    \u91c7\u6837\u7387\u4e3a8\u500d\uff0c \u5219USART_BRR[15:0] = ?\n        USARTDIV = 2 * 64000000 \/ 115200 = 1110 = 0x456\n        USART_BRR[15:0] = 0x453<\/code><\/pre>\n
    4.2.4.4 USART_RDR\u5bc4\u5b58\u5668<\/h4>\n

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    \n<\/center><\/p>\n
    4.2.4.5 USART_TDR\u5bc4\u5b58\u5668<\/h4>\n

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    \n<\/center><\/p>\n
    4.2.4.6 USART_PRESC\u5bc4\u5b58\u5668<\/h4>\n

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    \n<\/center><\/p>\n
    4.2.4.7 USART_ISR\u5bc4\u5b58\u5668<\/h4>\n

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    \n<\/center>
    \n

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    <\/div>
    \n<\/center><\/p>\n
    TXE : \u53d1\u9001\u6570\u636e\u5bc4\u5b58\u5668\u662f\u5426\u4e3a\u7a7a\u4f4d\n\u5982\u679c\u53d1\u9001\u6570\u636e\u5bc4\u5b58\u5668\u4e3a\u7a7a\uff0c\u5219\u53ef\u4ee5\u53d1\u9001\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\uff1b\n\u5982\u679c\u53d1\u9001\u6570\u636e\u5bc4\u5b58\u5668\u4e0d\u4e3a\u7a7a\uff0c\u5219\u4e0d\u53ef\u4ee5\u53d1\u9001\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\u3002\n\n\u5f53\u53d1\u9001\u5bc4\u5b58\u5668\u4e2d\u7684\u6570\u636e\u88ab\u4f20\u9001\u5230\u53d1\u9001\u79fb\u4f4d\u5bc4\u5b58\u5668\u4e2d\u65f6\uff0c\u786c\u4ef6\u81ea\u52a8\u5c06TXE\u4f4d\u7f6e1\uff1b\n\u5f53\u5411\u53d1\u9001\u5bc4\u5b58\u5668\u4e2d\u5199\u5165\u6570\u636e\u65f6\uff0c\u786c\u4ef6\u81ea\u52a8\u5c06TXE\u4f4d\u6e050.\n\n\u8bfbTXE\u4f4d\u4e3a0\u65f6\uff0c\u8868\u793a\u53d1\u9001\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u6709\u6570\u636e\uff0c\u4e0d\u53ef\u4ee5\u53d1\u9001\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\uff1b\n\u8bfbTXE\u4e3a\u4e3a1\u65f6\uff0c\u8868\u793a\u53d1\u9001\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u6ca1\u6709\u6570\u636e\uff0c\u53ef\u4ee5\u53d1\u9001\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\u3002\n<\/code><\/pre>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
        TC : \u53d1\u9001\u5b8c\u6210\u4f4d\n\n    \u5f53\u53d1\u9001\u5bc4\u5b58\u5668\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u6570\u636e\u6570\u636e\u53d1\u9001\u5b8c\u6210\u5e76\u4e14TXE\u4f4d\u88ab\u7f6e1\uff0c\u786c\u4ef6\u81ea\u52a8\u5c06TC\u4f4d\u7f6e1\uff1b\n    \u5f53\u5411\u53d1\u9001\u5bc4\u5b58\u5668\u4e2d\u5199\u5165\u6570\u636e\u65f6\uff0c\u786c\u4ef6\u81ea\u52a8\u5c06TC\u4f4d\u6e050.\n\n    \u8bfbTC\u4f4d\u4e3a0\u65f6\uff0c\u8868\u793a\u6700\u540e\u4e00\u4e2a\u6570\u636e\u6ca1\u6709\u53d1\u9001\u5b8c\u6210\uff0c\u4e0d\u53ef\u4ee5\u53d1\u9001\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\uff1b\n    \u8bfbTC\u4e3a\u4e3a1\u65f6\uff0c\u8868\u793a\u6700\u540e\u4e00\u4e2a\u6570\u636e\u53d1\u9001\u5b8c\u6210\uff0c\u53ef\u4ee5\u53d1\u9001\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\u3002<\/code><\/pre>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
        RXNE : \u8bfb\u6570\u636e\u5bc4\u5b58\u5668\u975e\u7a7a\u4f4d\n\n    \u5982\u679c\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e3a\u7a7a\uff0c\u5219\u4e0d\u53ef\u4ee5\u4ece\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u8bfb\u53d6\u6570\u636e\uff1b\n    \u5982\u679c\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e0d\u4e3a\u7a7a\uff0c\u5219\u53ef\u4ee5\u4ece\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u8bfb\u53d6\u6570\u636e\u3002\n\n    \u5f53\u63a5\u6536\u79fb\u4f4d\u5bc4\u5b58\u5668\u4e2d\u7684\u6570\u636e\u88ab\u4f20\u9001\u5230\u63a5\u6536\u5bc4\u5b58\u5668\u4e2d\u65f6\uff0c\u786c\u4ef6\u81ea\u52a8\u5c06RXNE\u4f4d\u7f6e1\uff1b\n    \u5f53\u4ece\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u8bfb\u53d6\u6570\u636e\u4e4b\u540e\uff0c\u786c\u4ef6\u81ea\u52a8\u5c06RXNE\u4f4d\u6e050.\n\n    \u8bfbRXNE\u4f4d\u4e3a0\u65f6\uff0c\u8868\u793a\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u6ca1\u6709\u6570\u636e\uff0c\u4e0d\u53ef\u4ee5\u4ece\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u8bfb\u6570\u636e\uff1b\n    \u8bfbRXNE\u4f4d\u4e3a1\u65f6\uff0c\u8868\u793a\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u6709\u6570\u636e\uff0c\u53ef\u4ee5\u4ece\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u8bfb\u6570\u636e\u3002<\/code><\/pre>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
      \u5982\u4e0a\u5c31\u662f\u521d\u59cb\u5316\u4e32\u53e3\u6240\u9700\u914d\u7f6e\u7684\u6240\u6709\u4e32\u53e3\u4e86\u3002\u9664\u4e86\u57fa\u672c\u7684gpio\u5f15\u811a\u548c\u65f6\u949f\u5bc4\u5b58\u5668\u521d\u59cb\u5316\u5916\uff0c\u4e3b\u8981\u662f\u4e32\u53e3\u6ce2\u7279\u7387\u7684\u521d\u59cb\u5316\uff0c\u548c\u8bfb\u5199\u5bc4\u5b58\u5668\u5916\u52a0uart\u4e2d\u65ad\u548c\u72b6\u6001\u5bc4\u5b58\u5668\uff08ISR\uff09\u7684\u914d\u7f6e\uff08\u901a\u8fc7\u5176\u4e2d\u7684\u7b2c5\u4f4d\u548c\u7b2c7\u4f4d\u5373\u53ef\u5224\u65ad\u51fa\u4ec0\u4e48\u65f6\u5019\u53ef\u8bfb\u53ef\u5199\uff09,\u641e\u61c2\u8fd9\u4e9b\u5bc4\u5b58\u5668\u7684\u914d\u7f6e\uff0c\u4e32\u53e3\u5c31\u53ef\u4ee5\u7b80\u5355\u62ff\u634f\u4e86\u3002<\/p>\n
    4.3 \u57fa\u4e8e\u5355\u7247\u673a\u5bc4\u5b58\u5668\u7684\u4e32\u53e3\u9a71\u52a8\u793a\u4f8b<\/h2>\n
    4.3.1 \u91cd\u5b9a\u5411\u4e32\u53e3\u8f93<\/h3>\n
      \u5b9e\u9645\u4f7f\u7528\u4e32\u53e3\u65f6\uff0c\u4e3a\u4e86\u7edf\u4e00\u63a5\u53e3\u3001\u63d0\u9ad8\u6548\u7387\u3001\u907f\u514d\u76f4\u63a5\u64cd\u4f5c\u5bc4\u5b58\u5668\uff0c\u65b9\u4fbf\u4e32\u53e3\u6253\u5370\u4fe1\u606f\u5230\u7ec8\u7aef\uff0c\u9700\u8981\u628aprintf\u91cd\u5b9a\u5411\u4e00\u4e0b\uff08\u4eba\u8bdd\u5c31\u662f\u6267\u884c\u7a0b\u5e8f\u65f6\u6ca1\u6709\u7edf\u4e00\u7684\u63a5\u53e3\uff0c\u60f3\u8ba9\u4e32\u53e3\u6253\u5370\u4fe1\u606f\u6bd4\u8f83\u9ebb\u70e6\uff0c\u7edf\u4e00\u4f7f\u7528printf\u6bd4\u8f83\u7701\u4e8b\uff09\u3002<\/p>\n
    main.c\nextern void printf(const char *fmt, ...);\n\nprintf.c\nvoid printf (const char *fmt, ...)\n{\n    va_list args;\n    char printbuffer[100];\n    va_start (args, fmt);\n\n    \/* For this to work, printbuffer must be larger than\n     * anything we ever want to print.\n     *\/\n    vsprintf (printbuffer, fmt, args);\n    va_end (args);\n    __uart_puts (printbuffer);\n}\n\nuart.c\nvoid __uart_putc(const char data)\n{\n    while (!(USART4->ISR & (0x1 << 7)));\n    USART4->TDR = data;\n    if (data == '\\n')\n        __uart_putc('\\r');\n}<\/code><\/pre>\n
      \u5982\u679c\u5c31\u60f3\u4f7f\u7528\u5bc4\u5b58\u5668\u6253\u5370\u6570\u636e\u4e5f\u884c\uff0c\u5982\u4e0b\u662f\u6211\u5b9e\u73b0\u7684\u4f7f\u7528\u5bc4\u5b58\u5668\u6253\u5370\u5b57\u7b26\u4e32\u7684\u51fd\u6570\u5c01\u88c5\u3002<\/p>\n
    \/\/ \u53d1\u9001\u4e00\u4e2a\u5b57\u8282\u7684\u51fd\u6570\nvoid hal_send_char(const char ch)\n{\n    \/\/ 1. \u5224\u65ad\u53d1\u9001\u5bc4\u5b58\u5668\u662f\u5426\u4e3a\u7a7a\uff0c\u5982\u679c\u4e3a\u7a7a\u53d1\u9001\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\uff0c\n    \/\/ \u5982\u679c\u4e0d\u4e3a\u7a7a\u7b49\u5f85\u53d1\u9001\u6570\u636e\u5bc4\u5b58\u5668\u4e3a\u7a7a\u3002  USART4_ISR[7]\n    while(!(USART4->ISR & (0x1 << 7)));\n    \/\/ 2. \u53d1\u9001\u6570\u636e\uff0c\u5411\u53d1\u9001\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u5199\u5165\u6570\u636e USART4_TDR[7:0]\n    USART4->TDR = ch;\n}\n\nvoid hal_send_string(const char *str)\n{\n    \/\/ 1. \u8c03\u7528\u53d1\u9001\u5b57\u7b26\u7684\u51fd\u6570\u4e00\u4e2a\u4e00\u4e2a\u7684\u53d1\u9001\uff0c\u5b57\u7b26\u4e32\u7684\u7ed3\u5c3e\u4e3a\u2018\\0\u2019\n     while (*str != '\\0') {\n        hal_send_char(*str);\n        str++;\n    }\n\n}<\/code><\/pre>\n
      \u8fd8\u6709\u5e93\u51fd\u6570\u7684\u91cd\u5b9a\u5411\u65b9\u5f0f\uff0c\u6211\u8fd9\u8fb9\u6ca1\u4ee3\u7801\uff0c\u4e0d\u8fc7\u6b8a\u9014\u540c\u5f52\uff0c\u90fd\u662f\u4e00\u6837\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002\uff08\u65f6\u95f4\u4e45\u8fdc\u6211\u8fd9\u6ca1\u6709\u53ef\u4ee5\u6253\u5370\u7684\u5f00\u53d1\u677f\uff0c\u6253\u5370\u6548\u679c\u5927\u5bb6\u5c31\u81ea\u5df1\u8111\u8865\u5427\uff09<\/p>\n
    4.3.2 \u4e32\u53e3\u4ee3\u7801\u5b9e\u73b0<\/h3>\n
    void hal\\_uart4\\_init(void)\n{\n\/\/ 1. \u4f7f\u80fdGPIOB,GPIOG\u5916\u8bbe\u7684\u65f6\u949f RCC\\_MP\\_AHB4ENSETR\\[1]\\[6] = 0b1\nRCC->MP\\_AHB4ENSETR = (0x1 << 1) | (0x1 << 6);\n\/\/ 2. \u8bbe\u7f6ePB2, \u548c PG11\u5f15\u811a\u4e3a\u590d\u7528\u7684\u529f\u80fd\n\/\/ GPIOB\\_MODER\\[5:4] = 0b10  GPIOG\\_MODER\\[23:22] = 0b10\nGPIOB->MODER &= (~(0x3 << 4));\nGPIOB->MODER |= (0x2 << 4);\nGPIOG->MODER &= (~(0x3 << 22));\nGPIOG->MODER |= (0x2 << 22);\n\/\/ 3. \u8bbe\u7f6ePB2\u5f15\u811a\u4e3aUART4\\_RX\u529f\u80fd  GPIOB\\_AFRL\\[11:8] --> AF8 --> 0b1000\n\/\/ \u8bbe\u7f6ePG11\u5f15\u811a\u4e3aUART4\\_TX\u529f\u80fd  GPIOG\\_AFRH\\[15:12] --> AF6 --> 0b0110\nGPIOB->AFRL &= (~(0xF << 8));\nGPIOB->AFRL |= (0x8 << 8);\nGPIOG->AFRH &= (~(0xF << 12));\nGPIOG->AFRH |= (0x6 << 12);\n\/\/ 4. \u4f7f\u80fdUART4\u5916\u8bbe\u7684\u65f6\u949f  RCC\\_MP\\_APB1ENSETR\\[16] = 0b1\nRCC->MP\\_APB1ENSETR = (0x1 << 16);\n\/\/ 5. \u5224\u65adUART4\u4e32\u53e3\u662f\u5426\u4f7f\u80fd\uff0c\u5982\u679c\u4f7f\u80fd\u5219\u7981\u6b62\u4e32\u53e3\nif (USART4->CR1 & (0x1 << 0)) {\ndelay\\_ms(2000);  \/\/ \u7b49\u5f85\u4e4b\u524d\u7684\u4e32\u53e3\u7684\u6570\u636e\u53d1\u9001\u5b8c\u6210\u4e4b\u540e\u5728\u7981\u6b62\u4e32\u53e3\nUSART4->CR1 &= (\\~(0x1 << 0));  \/\/ \u7981\u6b62\u4e32\u53e3\u7684\u4f7f\u80fd\n}\\\n\/\/ 6. \u8bbe\u7f6e\u6570\u636e\u4f4d\u4e3a8\u4f4d\u7684\u6570\u636e\u5bbd\u5ea6 USART4\\_CR1\\[28]\\[12] = 0b00\nUSART4->CR1 &= ~((0x1 << 28) | (0x1 << 12));\n\/\/ 7. \u7981\u6b62\u6821\u9a8c\u4f4d\uff0c\u4e0d\u4f7f\u7528\u6821\u9a8c  USART4\\_CR1\\[10] = 0b0\nUSART4->CR1 &= ~(0x1 << 10);\n\/\/ 8. \u8bbe\u7f6e\u4e32\u53e3\u7684\u91c7\u6837\u7387\u4e3a16\u500d\u6216\u80058\u500d\uff0c\u6700\u7ec8\u4f1a\u5f71\u54cd\u6ce2\u7279\u7387\u7684\u8ba1\u7b97  USART4\\_CR1\\[15]\nUSART4->CR1 &= ~(0x1 << 15);\n\/\/ 9. \u8bbe\u7f6e\u505c\u6b62\u4f4d\u7684\u4e2a\u6570\u4e3a1\u4f4d  USART4\\_CR2\\[13:12] = 0b00\nUSART4->CR2 &= ~(0x3 << 12);\n\/\/ 10. \u8bbe\u7f6e\u4e32\u53e3\u65f6\u949f\u7684\u5206\u9891\u5bc4\u5b58\u5668 USART4\\_PRERC\\[3:0]  \u6700\u7ec8\u4e5f\u4f1a\u5f71\u54cd\u6ce2\u7279\u7387\u7684\u8ba1\u7b97\n\/\/ usart\\_ker\\_ck \u65f6\u949f\u6e90\u7684\u9891\u7387\u7b49\u4e8e 64MHz\n\/\/ usart\\_ker\\_ck\\_pesc = usart\\_ker\\_ck \/ USART4\\_PRESC\\[3:0]\nUSART4->PRESC &= \\~(0xF << 0);\n\/\/ 11. \u8bbe\u7f6e\u4e32\u53e3\u7684\u6ce2\u7279\u7387\u4e3a115200bps  USART4\\_BRR\\[15:0]\nUSART4->BRR = 0x22B;\n\/\/ 12. \u4f7f\u80fd\u4e32\u53e3\u53d1\u9001\u5668  USART4\\_CR1\\[3] = 0x1\nUSART4->CR1 |= (0x1 << 3);\n\/\/ 13. \u4f7f\u80fd\u4e32\u53e3\u63a5\u6536\u5668  USART4\\_CR1\\[2] = 0x1\nUSART4->CR1 |= (0x1 << 2);\n\/\/ 14. \u4f7f\u80fd\u4e32\u53e3        USART4\\_CR1\\[0] = 0x1\nUSART4->CR1 |= (0x1 << 0);\n}\n\/\/ \u53d1\u9001\u4e00\u4e2a\u5b57\u8282\u7684\u51fd\u6570\nvoid hal\\_send\\_char(const char ch)\n{\n\/\/ 1. \u5224\u65ad\u53d1\u9001\u5bc4\u5b58\u5668\u662f\u5426\u4e3a\u7a7a\uff0c\u5982\u679c\u4e3a\u7a7a\u53d1\u9001\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\uff0c\n\/\/ \u5982\u679c\u4e0d\u4e3a\u7a7a\u7b49\u5f85\u53d1\u9001\u6570\u636e\u5bc4\u5b58\u5668\u4e3a\u7a7a\u3002  USART4\\_ISR\\[7]\nwhile(!(USART4->ISR & (0x1 << 7)));\n\/\/ 2. \u53d1\u9001\u6570\u636e\uff0c\u5411\u53d1\u9001\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u5199\u5165\u6570\u636e USART4\\_TDR\\[7:0]\nUSART4->TDR = ch;\nif (ch == '\\n')\nhal\\_send\\_char('\\r');\n}\n\n\/\/ \u53d1\u9001\u5b57\u7b26\u4e32\u7684\u51fd\u6570\nvoid hal\\_send\\_string(const char \\*str)\n{\n\/\/ 1. \u8c03\u7528\u53d1\u9001\u5b57\u7b26\u7684\u51fd\u6570\u4e00\u4e2a\u4e00\u4e2a\u7684\u53d1\u9001\uff0c\u5b57\u7b26\u4e32\u7684\u7ed3\u5c3e\u4e3a\u2018\\0\u2019\nwhile (\\*str != '\\0') {\nhal\\_send\\_char(\\*str);\nstr++;\n}\n}\n\n\/\/ \u63a5\u6536\u4e00\u4e2a\u5b57\u7b26\u7684\u51fd\u6570\nchar hal\\_recv\\_char(void)\n{\nchar ch;\n\/\/ 1. \u5224\u65ad\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u662f\u5426\u6709\u6709\u6548\u7684\u6570\u636e\uff0c\u5982\u679c\u6709\u6570\u636e\u5219\u8bfb\u53d6\u6570\u636e\n\/\/   \u5982\u679c\u6ca1\u6709\u6709\u6548\u7684\u6570\u636e\uff0c\u5219\u7b49\u5f85\u6709\u6709\u6548\u7684\u6570\u636e\u4e4b\u540e\u5728\u8bfb\u53d6\u3002 USART4\\_ISR\\[5]\nwhile(!(USART4->ISR & (0x1 << 5)));\n\/\/ 2. \u4ece\u63a5\u6536\u6570\u636e\u5bc4\u5b58\u5668\u4e2d\u8bfb\u53d6\u6570\u636e\u5230ch\u53d8\u91cf\u4e2d   USART4\\_RDR\\[7:0]\nch = (char)USART4->RDR;\nreturn ch;\n}\n\n\/\/ \u63a5\u6536\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u51fd\u6570\n\nchar  buffer\\[LEN] = {0};\nchar \\* hal\\_recv\\_string(char str\\[])\n{\n\/\/ 1. \u4e00\u4e2a\u5b57\u7b26\u4e00\u4e2a\u5b57\u7b26\u7684\u63a5\u6536\uff0c\u63a5\u6536\u5230\u4e4b\u540e\u5c06\u6570\u636e\u5b58\u5230buffer\u7f13\u51b2\u533a\u4e2d\uff0c\n\/\/ \u6700\u591a\u63a5\u653649\uff0c\u63a5\u6536\u7ed3\u675f\u4e4b\u540e\u7ed3\u5c3e\u9700\u8981\u8865'\\0'.\n\/\/ \u63a5\u6536\u7684\u60c5\u51b5\uff0c\u4e00\u79cd\u662f\u63a5\u653649\u4e2a\u5b57\u7b26\u7ed3\u675f\uff0c\u53e6\u4e00\u79cd\u662f\u6309\u4e0benter\u952e\u4e4b\u540e\u7ed3\u675f\n\/\/ enter\u952e\u662f\u4e00\u4e2a\u5b57\u7b26'\\r'.\n\n    unsigned int i;\n    for (i = 0; i < LEN - 1;i++) {\n        buffer[i] = hal_recv_char();  \/\/ \u63a5\u6536\u4e00\u4e2a\u5b57\u7b26\n        hal_send_char(buffer[i]);   \/\/ \u5b57\u7b26\u518d\u7ec8\u7aef\u56de\u663e\n        if (buffer[i] == '\\r') {\n            break;\n        }\n    }\n    buffer[i] = '\\0';   \/\/ \u5b57\u7b26\u4e32\u7684\u7ed3\u5c3e\u8865'\\0'\n    hal_send_char('\\n');\n    return buffer;\n\n}<\/code><\/pre>\n
      \u5982\u4e0a\u5c31\u662f\u5355\u7247\u673a\u9a71\u52a8\u4e32\u53e3\u7684\u5168\u90e8\u5185\u5bb9\u3002\u603b\u5f97\u6765\u8bf4\u5c31\u662f\u6839\u636e\u6570\u636e\u624b\u518c\u7684\u5bf9\u5e94\u7ae0\u8282\u8bfb\u53d6\u5bc4\u5b58\u5668\u914d\u7f6e\uff0c\u9010\u4e2a\u914d\u7f6e\u5bc4\u5b58\u5668\u4fe1\u606f\uff0c\u6700\u540e\u5373\u53ef\u5411\u8bfb\u5199\u5bc4\u5b58\u5668\u53d1\u9001\u6216\u8bfb\u53d6\u6570\u636e\u5b9e\u73b0\u4e32\u53e3\u529f\u80fd\u4e86\u3002<\/p>\n
    5 \u57fa\u4e8elinux\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7684\u4e32\u53e3\u9a71\u52a8\u65b9\u5f0f<\/h1>\n
      \u4f7f\u7528linux\u7cfb\u7edf\u4e0b\u7684\u4e32\u53e3\u9a71\u52a8\u5c31\u7565\u663e\u590d\u6742\u4e86\uff0c\u4e0d\u8fc7\u4e07\u53d8\u4e0d\u79bb\u5176\u5b97\uff0c\u6838\u5fc3\u601d\u8def\u662f\u4e00\u6837\u7684\u3002\u5728\u9a71\u52a8\u548c\u8bbe\u5907\u6811\u90fd\u6ca1\u95ee\u9898\u7684\u60c5\u51b5\u4e0b\u76f4\u63a5\u4f7f\u7528\u5b98\u65b9\u63d0\u4f9b\u7684\u63a5\u53e3\u51fd\u6570\u521d\u59cb\u5316\u4e32\u53e3\u5373\u53ef\u76f4\u63a5\u4f7f\u7528\u4e86\u3002\u552f\u4e00\u9700\u8981\u6ce8\u610f\u7684\u5c31\u662f\u8c03\u7528\u4e32\u53e3\u8bfb\u5199\u51fd\u6570\u524d\uff0c\u5728\u5e94\u7528\u5c42\u5b9a\u4e49\u81ea\u5df1\u7684\u6570\u636e\u5e27\u683c\u5f0f\u65b9\u4fbf\u5904\u7406\u3002
    \n  \u5728Linux\u4e2drs232\u548crs485\u7684\u4f7f\u7528\u4e5f\u4e0d\u96be\u3002\u56e0\u4e3a\u6570\u636e\u4ece\u5e94\u7528\u5c42\u5230cpu\u8fd9\u6bb5\u6d41\u7a0b\u4e2d\uff0c\u5b83\u7684\u5904\u7406\u7528\u7684\u8fd8\u662f\u4e32\u53e3\uff0c\u6700\u540e\u6570\u636e\u7531\u4e32\u53e3\u51fa\u6765\u540e\u518d\u7ecf\u8fc7\u4e13\u95e8\u7684rs232\u548crs485\u82af\u7247\u8f6c\u6362\u6210\u6240\u9700\u7684\u7535\u5e73\u548c\u5dee\u5206\u4fe1\u53f7\uff0c\u5373\u53ef\u53d1\u7ed9\u673a\u5668\u7684\u53e6\u4e00\u7aef\u63a5\u6536\u3002<\/p>\n
    5.1 \u786c\u4ef6\u63a5\u7ebf<\/h2>\n
      linux\u8fd9\u91cc\u4ee5luckfox\u7684\u4e32\u53e3\u6559\u7a0b\u4e3a\u57fa\u7840\uff0c\u5982\u4e0b\u662f\u745e\u82af\u5faerv1106\u82af\u7247\u7684\u5f00\u53d1\u677f\u5f15\u811a\u529f\u80fd\u56fe\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
      \u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u4f5c\u4e3a\u4e32\u53e3\u590d\u7528\u7684\u5f15\u811a\u6709\u56db\u7ec4\uff0cUART2\u3001UART3\u3001UART4\u3001UART5\uff1b\u5176\u4e2dUART2\u662f\u8c03\u8bd5\u4e32\u53e3\u3002<\/p>\n
    5.1.1 \u6838\u5fc3\u5f15\u811a\u529f\u80fd\u89e3\u6790<\/h3>\n
      \u770b\u4e0a\u56fe\u9996\u5148\u5c31\u4f1a\u4ea7\u751f\u7b2c\u4e00\u4e2a\u95ee\u9898\uff0c\u4e3a\u5565\u6709\u7684\u4e32\u53e3\u7ec4\u53ea\u6709\u4fe9\u5f15\u811arx\u548ctx\uff0c\u6709\u7684\u5c31\u540c\u65f6\u53c8cts\u548crts\u3001tx\u548crx\uff0c\u4ece\u524d\u6587\u53ef\u4ee5\u770b\u51fa\uff0c\u4e32\u53e3\u901a\u4fe1\u662f\u5f02\u6b65\u5168\u53cc\u5de5\u901a\u4fe1\uff0c\u56e0\u6b64\uff0c\u6700\u57fa\u7840\u7684\u529f\u80fd\u5b9e\u73b0\u53ea\u9700\u8981tx\u548crx\u5373\u53ef\uff0c\u90a3\u5176\u4ed6\u5f15\u811a\u7684\u4f5c\u7528\u662f\u5565\u5462\uff1f
    \n  \u5982\u4e0b\u662f\u5bf9\u5f15\u811a\u529f\u80fd\u7684\u89e3\u91ca\uff1a<\/p>\n
    CTS\uff08Clear to Send\uff09\u4e0eRTS\uff08Request to Send\uff09\n- \u4f5c\u7528\uff1a\u5c5e\u4e8e\u786c\u4ef6\u6d41\u63a7\u4fe1\u53f7\uff0c\u7528\u4e8e\u534f\u8c03\u8bbe\u5907\u95f4\u6570\u636e\u4f20\u8f93\u7684\u65f6\u5e8f\u3002\n- RTS\uff1a\u53d1\u9001\u65b9\u901a\u8fc7\u62c9\u9ad8RTS\u4fe1\u53f7\u8868\u793a\u201c\u8bf7\u6c42\u53d1\u9001\u6570\u636e\u201d\n- CTS\uff1a\u63a5\u6536\u65b9\u51c6\u5907\u597d\u540e\u62c9\u9ad8CTS\u4fe1\u53f7\uff0c\u8868\u793a\u201c\u5141\u8bb8\u53d1\u9001\u201d\n- \u5e94\u7528\u573a\u666f\uff1a\u9632\u6b62\u6570\u636e\u6ea2\u51fa\uff0c\u5c24\u5176\u5728\u9ad8\u901f\u6216\u9ad8\u8d1f\u8f7d\u901a\u4fe1\u4e2d\u3002\u4f8b\u5982\uff0c\u5f53\u63a5\u6536\u7f13\u51b2\u533a\u6ee1\u65f6\uff0cCTS\u4f1a\u7f6e\u4f4e\u4ee5\u6682\u505c\u53d1\u9001<\/code><\/pre>\n
    5.1.2 \u786c\u4ef6\u6d41\u63a7\u4e0eISR\u5bc4\u5b58\u5668\u533a\u522b<\/h3>\n
      \u8fd9\u53c8\u5f15\u51fa\u65b0\u7684\u95ee\u9898\uff0c\u4ece\u529f\u80fd\u4e0a\u770b\u548c\u5355\u7247\u673a\u4e2d\u7684ISR\u5bc4\u5b58\u5668\u529f\u80fd\u7c7b\u4f3c\uff0c\u662f\u5728linux\u4e0a\u7684\u53e6\u4e00\u79cd\u8868\u8ff0\uff1f\u7ee7\u7eed\u67e5\u8be2\u53d1\u73b0\u5e76\u975e\u5982\u6b64\u3002
    \n  \u745e\u82af\u5fae RV1106 \u7684 UART4 \u63a5\u53e3\u652f\u6301 CTS\uff08Clear to Send\uff09\u548c RTS\uff08Request to Send\uff09\u529f\u80fd\uff0c\u5e76\u975e\u76f4\u63a5\u7531\u5355\u7247\u673a\u4e2d\u7684 ISR\uff08\u4e2d\u65ad\u72b6\u6001\u5bc4\u5b58\u5668\uff09\u201c\u62d3\u5c55\u201d\u800c\u6765\uff0c\u800c\u662f UART \u63a7\u5236\u5668\u786c\u4ef6\u672c\u8eab\u652f\u6301\u7684\u786c\u4ef6\u6d41\u63a7\uff08Hardware Flow Control\uff09\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u5177\u4f53\u5206\u6790\uff1a
    \n1.\u786c\u4ef6\u6d41\u63a7\u7684\u672c\u8d28
    \n  CTS\/RTS \u662f UART \u901a\u4fe1\u4e2d\u6807\u51c6\u7684\u786c\u4ef6\u6d41\u63a7\u4fe1\u53f7\uff0c\u7528\u4e8e\u89e3\u51b3\u6570\u636e\u4f20\u8f93\u65f6\u7684\u7f13\u51b2\u533a\u6ea2\u51fa\u95ee\u9898\uff1a
    \n  RTS\uff08\u8f93\u51fa\u4fe1\u53f7\uff09\uff1a\u901a\u77e5\u63a5\u6536\u65b9\u201c\u672c\u8bbe\u5907\u5df2\u51c6\u5907\u597d\u63a5\u6536\u6570\u636e\u201d\u3002
    \n  CTS\uff08\u8f93\u5165\u4fe1\u53f7\uff09\uff1a\u63a5\u6536\u65b9\u901a\u8fc7\u8be5\u4fe1\u53f7\u544a\u77e5\u53d1\u9001\u65b9\u201c\u662f\u5426\u5141\u8bb8\u53d1\u9001\u6570\u636e\u201d\u3002
    \n  \u8fd9\u79cd\u673a\u5236\u72ec\u7acb\u4e8e\u6570\u636e\u5bc4\u5b58\u5668\uff08\u5982\u53d1\u9001\/\u63a5\u6536\u7f13\u51b2\u533a\uff09\uff0c\u7531 UART \u63a7\u5236\u5668\u7684\u4e13\u7528\u786c\u4ef6\u903b\u8f91\u5b9e\u73b0\uff0c\u65e0\u9700\u901a\u8fc7\u8f6f\u4ef6\u8f6e\u8be2 ISR \u5bc4\u5b58\u5668\u6765\u6a21\u62df\u3002
    \n2.RV1106 \u7684 UART \u63a7\u5236\u5668\u8bbe\u8ba1
    \n  RV1106 \u7684 UART \u6a21\u5757\u7b26\u5408\u901a\u7528\u4e32\u884c\u63a7\u5236\u5668\u89c4\u8303\uff0c\u5176\u6d41\u63a7\u529f\u80fd\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0\uff1a
    \n  \u4e13\u7528\u5bc4\u5b58\u5668\u63a7\u5236\uff1a\u5982\u63a7\u5236\u5bc4\u5b58\u5668\uff08UART_CR\uff09\u4e2d\u7684 CTSE\uff08CTS \u4f7f\u80fd\u4f4d\uff09\u548c RTSE\uff08RTS \u4f7f\u80fd\u4f4d\uff09\uff0c\u7528\u4e8e\u5f00\u542f\u786c\u4ef6\u6d41\u63a7\u3002
    \n  \u72b6\u6001\u5bc4\u5b58\u5668\u53cd\u9988\uff1aISR \u5bc4\u5b58\u5668\u4e2d\u7684\u6807\u5fd7\u4f4d\uff08\u5982 CTSIF\uff09\u4ec5\u7528\u4e8e\u53cd\u6620 CTS \u5f15\u811a\u7684\u7535\u5e73\u53d8\u5316\u72b6\u6001\uff0c\u800c\u975e\u201c\u751f\u6210\u201d\u6d41\u63a7\u529f\u80fd\u672c\u8eab\u3002
    \n\uff08\u4f8b\u5982\uff1a\u5f53 CTS \u5f15\u811a\u88ab\u5bf9\u65b9\u8bbe\u5907\u62c9\u4f4e\u65f6\uff0cCTSIF \u7f6e\u4f4d\u89e6\u53d1\u4e2d\u65ad\uff0c\u4f46\u6d41\u63a7\u7684\u54cd\u5e94\u4ecd\u7531\u786c\u4ef6\u81ea\u52a8\u5904\u7406\u3002\uff09
    \n3.\u4e0e\u5355\u7247\u673a ISR \u5bc4\u5b58\u5668\u7684\u533a\u522b
    \n  \u5355\u7247\u673a\u573a\u666f\uff1a\u90e8\u5206\u4f4e\u7aef\u5355\u7247\u673a\u53ef\u80fd\u7f3a\u4e4f\u786c\u4ef6\u6d41\u63a7\u6a21\u5757\uff0c\u9700\u901a\u8fc7\u8f6f\u4ef6\u6a21\u62df\uff08\u5982\u7528 GPIO \u548c ISR \u4e2d\u65ad\u624b\u52a8\u63a7\u5236\u7535\u5e73\uff09\u3002\u4f46 RV1106 \u4f5c\u4e3a\u9ad8\u6027\u80fd SoC\uff0c\u5176 UART \u63a7\u5236\u5668\u5df2\u96c6\u6210\u5b8c\u6574\u7684\u786c\u4ef6\u6d41\u63a7\u7535\u8def\u3002
    \n  RV1106 \u7684\u5b9e\u73b0\uff1aCTS\/RTS \u529f\u80fd\u7531 UART \u63a7\u5236\u5668\u7684\u7269\u7406\u5f15\u811a\u548c\u5185\u90e8\u72b6\u6001\u673a\u76f4\u63a5\u7ba1\u7406\uff0c\u5f00\u53d1\u8005\u53ea\u9700\u914d\u7f6e\u76f8\u5173\u5bc4\u5b58\u5668\u5373\u53ef\u542f\u7528\uff0c\u65e0\u9700\u8f6f\u4ef6\u5e72\u9884\uff08UART4 \u7684 CTS\/RTS \u5f15\u811a\u53ef\u901a\u8fc7 30Pin \u6269\u5c55\u63a5\u53e3\u5f15\u51fa\uff0c\uff09\u3002<\/p>\n
    \/\/ \u793a\u4f8b\uff1a\u4f7f\u80fd\u786c\u4ef6\u6d41\u63a7\nuart_port->cr |= UART_CR_CTSE | UART_CR_RTSE;  \/\/ \u8bbe\u7f6e\u63a7\u5236\u5bc4\u5b58\u5668<\/code><\/pre>\n
      RV1106 \u7684 UART4 \u7684 CTS\/RTS \u529f\u80fd\u662f\u82af\u7247\u786c\u4ef6\u539f\u751f\u652f\u6301\u7684\u6d41\u63a7\u673a\u5236\uff0c\u901a\u8fc7\u4e13\u7528\u5bc4\u5b58\u5668\u548c\u7269\u7406\u5f15\u811a\u5b9e\u73b0\uff0c\u4e0e ISR \u5bc4\u5b58\u5668\u4ec5\u5b58\u5728\u72b6\u6001\u53cd\u9988\u5173\u7cfb\uff0c\u800c\u975e\u7531\u5176\u201c\u62d3\u5c55\u201d\u800c\u6765\u3002\u5176\u8bbe\u8ba1\u7b26\u5408\u4e3b\u6d41 UART \u63a7\u5236\u5668\u6807\u51c6\uff08\u5982 ARM Cortex-A \u7cfb\u5217\u5916\u8bbe\uff09\uff0c\u53ef\u6709\u6548\u63d0\u5347\u9ad8\u901f\u901a\u4fe1\u7684\u53ef\u9760\u6027\u3002
    \n  \u5b9e\u9645\u4f7f\u7528\u65f6\u6ca1\u592a\u538b\u69a8uart\u4e32\u53e3\u7684\u6027\u80fd\uff0c\u5bf9\u6d41\u63a7\u6ca1\u6709\u592a\u591a\u7814\u7a76\uff0c\u53d1\u73b0\u5b83\u4e0d\u50cf\u5355\u7247\u673a\u4e2d\u7684ISR\u5bc4\u5b58\u5668\u4e00\u6837\u9700\u8981\u5728\u8f6f\u4ef6\u5c42\u9762\u9891\u7e41\u64cd\u4f5c\uff0c\u64cd\u4f5c\u90fd\u7531\u5185\u6838\u6765\u5b8c\u6210\uff0c\u4f7f\u7528\u8d77\u6765\u66f4\u65b9\u4fbf\u3002<\/p>\n
    5.1.2 \u8bbe\u5907\u8282\u70b9<\/h3>\n
      \u6b63\u5e38\u6765\u8bf4\u4e32\u53e3\u9a71\u52a8\u9ed8\u8ba4\u96c6\u6210\u5728\u5185\u6838\u4e2d\uff0c\u57284.x\u4ee5\u4e0a\u7684\u5185\u6838\u65e0\u9700\u8003\u8651\u9002\u914d\u95ee\u9898\u3002\u9a71\u52a8\u9ed8\u8ba4\u652f\u6301232\u548c485\u534f\u8bae\uff0c\u552f\u4e00\u9700\u8981\u8003\u8651\u7684\u662f485\u662f\u534a\u53cc\u5de5\u901a\u4fe1\u7684\uff0c\u5b83\u7684DE\u5f15\u811a\u63a7\u5236\u8f93\u51fa\u8f93\u5165\u65b9\u5411\uff0c\u9700\u8981\u989d\u5916\u5173\u6ce8\u4e00\u4e0b\uff08\u5b9e\u9645\u4e0a\u5c31\u662f\u5728\u4f20\u8f93\u6570\u636e\u65f6\u62c9\u4f4e\u62c9\u9ad8\u7535\u5e73\uff0c\u5728\u5e94\u7528\u5c42\u6216\u9a71\u52a8\u5c42\u90fd\u5f88\u597d\u5904\u7406\uff0c\u4e0d\u662f\u96be\u70b9\uff09\u3002<\/p>\n

    \n
    <\/div>
    \n<\/center><\/p>\n
      \u5982\u4e0b\u662f\u5bf9DE\u5f15\u811a\u5728\u5e94\u7528\u5c42\u4f7f\u7528\u65f6\u76842\u79cd\u5904\u7406\u65b9\u5f0f\uff1a<\/p>\n
    5.1.2.1 \u65e0\u9700\u8bbe\u5907\u6811\u914d\u7f6e\u7684\u6761\u4ef6<\/h4>\n
      \u5f15\u811a\u672a\u88ab\u590d\u7528\u4e14\u9ed8\u8ba4\u529f\u80fd\u4e3aGPIO\u82e5\u76ee\u6807GPIO\u5728\u786c\u4ef6\u8bbe\u8ba1\u4e2d\u5df2\u9ed8\u8ba4\u4f5c\u4e3a\u666e\u901a\u8f93\u5165\/\u8f93\u51fa\u5f15\u811a\uff0c\u4e14\u672a\u88ab\u5176\u4ed6\u529f\u80fd\uff08\u5982I2C\u3001SPI\u7b49\uff09\u590d\u7528\uff0c\u5219\u53ef\u76f4\u63a5\u901a\u8fc7sysfs\u64cd\u4f5c\u3002<\/p>\n
    echo 227 > \/sys\/class\/gpio\/export # \u5bfc\u51faGPIO227[8,10](@ref)\necho out > \/sys\/class\/gpio\/gpio227\/direction\necho 1 > \/sys\/class\/gpio\/gpio227\/value #\u8f93\u51fa\u9ad8\u7535\u5e73<\/code><\/pre>\n
      \u82af\u7247\u5382\u5546\u5df2\u9884\u8bbeGPIO\u63a7\u5236\u5668\u5927\u591a\u6570SoC\uff08\u5982\u6811\u8393\u6d3e\u3001i.MX\u7cfb\u5217\uff09\u5728\u8bbe\u5907\u6811\u4e2d\u5df2\u5b9a\u4e49GPIO\u63a7\u5236\u5668\u7684\u57fa\u5730\u5740\u548c\u529f\u80fd\uff0c\u7528\u6237\u53ea\u9700\u6309\u7f16\u53f7\u8ba1\u7b97\u5b9e\u9645\u5f15\u811a\u503c\uff08\u4f8b\u5982\u57fa\u5730\u5740 + \u5f15\u811a\u53f7\uff09\uff0c\u65e0\u9700\u989d\u5916\u914d\u7f6e<\/p>\n
    5.1.2.2 \u5fc5\u987b\u8bbe\u5907\u6811\u914d\u7f6e\u7684\u573a\u666f<\/h4>\n
      \u5f15\u811a\u88ab\u5176\u4ed6\u529f\u80fd\u590d\u7528\u82e5\u76ee\u6807\u5f15\u811a\u9ed8\u8ba4\u7528\u4e8e\u5176\u4ed6\u5916\u8bbe\uff08\u5982UART\u3001PWM\u7b49\uff09\uff0c\u9700\u901a\u8fc7\u8bbe\u5907\u6811\u89e3\u9664\u590d\u7528\u5e76\u58f0\u660e\u4e3aGPIO\u3002<\/p>\n
    - \u5728\u8bbe\u5907\u6811\u4e2d\u5173\u95edI2C\u5360\u7528\uff1a\n&i2c4 {\n    status = \"disabled\";  \/\/ \u7981\u7528I2C4\u91ca\u653eGPIO\u5f15\u811a[5](@ref)\n};\n- \u91cd\u65b0\u914d\u7f6e\u5f15\u811a\u4e3aGPIO\u6a21\u5f0f\uff1a\npinctrl_my_gpio: my_gpio_grp {\n    fsl,pins = <\n        MX8MM_IOMUXC_I2C4_SDA_GPIO5_IO21 0x19  \/\/ \u590d\u7528\u4e3aGPIO5_IO21\n    >;\n};<\/code><\/pre>\n
      \u9a71\u52a8\u9700\u7ed1\u5b9aGPIO\u8d44\u6e90\u82e5\u9700\u8981\u5728\u5185\u6838\u9a71\u52a8\u4e2d\u52a8\u6001\u7533\u8bf7GPIO\uff08\u5982\u4e2d\u65ad\u5904\u7406\uff09\uff0c\u5219\u5fc5\u987b\u5728\u8bbe\u5907\u6811\u4e2d\u58f0\u660e\u5f15\u811a\u7f16\u53f7\u548c\u5c5e\u6027\uff0c\u4f9b\u9a71\u52a8\u901a\u8fc7of_get_named_gpio()\u89e3\u6790\u3002
    \n  \u7136\u540e\u9009\u62e9\u5c06de\u5f15\u811a\u7684\u5904\u7406\u903b\u8f91\u653e\u5728\u9a71\u52a8\u4e2d\u8fd8\u662f\u5e94\u7528\u5c42\uff0c\u53cd\u6b63\u662f\u5728\u53d1\u9001\u6570\u636e\u524d\u5c06\u5f15\u811a\u7f6e\u4e3a\u9ad8\uff0c\u53d1\u9001\u5b8c\u540e\u7f6e\u4e3a\u4f4e\u63a5\u6536\u6570\u636e\uff0c\u8003\u8651\u597d\u901a\u4fe1\u534f\u8bae\u548c\u65f6\u95f4\u95f4\u9694\u5c31\u597d\u4e86\uff0c\u653e\u5728\u54ea\u5b9e\u73b0\u90fd\u4e00\u6837\u3002<\/p>\n
    5.2 \u5e94\u7528\u5c42\u4e32\u53e3\u5b9e\u73b0<\/h2>\n
      \u6211\u8fd9\u91cc\u4f7f\u7528\u7684\u662frs485\u7684\u4e32\u53e3\u4ee3\u7801\u4f5c\u4e3a\u793a\u4f8b\uff0c\u4f46\u5b9e\u9645\u4e0a232\u548c485\u8fd8\u6709\u4e32\u53e3\u7684\u4f7f\u7528\u65b9\u6cd5\u533a\u522b\u4e0d\u5927\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\u5168\u53cc\u5de5\u548c\u534a\u53cc\u5de5\u4ee5\u53cade\u5f15\u811a\u7684\u533a\u522b\u3002\u7535\u5e73\u8f6c\u6362\u4e4b\u7c7b\u7684\u534f\u8bae\u95ee\u9898\u90fd\u6709\u76f8\u5e94\u7684\u82af\u7247\u66ff\u4f60\u5b8c\u6210\u4e86\uff0c\u4e0d\u9700\u8981\u5e94\u7528\u5c42\u6765\u5904\u7406\uff08\u5f53\u7136\u5982\u679c\u5bf9\u4e32\u53e3\u6027\u80fd\u6709\u9ad8\u8981\u6c42\u5f53\u6211\u6ca1\u8bf4\uff0c\u6211\u76ee\u524d\u7684\u9879\u76ee\u5bf9\u4e32\u53e3\u7684\u4f7f\u7528\u6ca1\u90a3\u4e48\u5927\u6570\u636e\u91cf\u4ee5\u53ca\u8fdc\u8ddd\u79bb\u4f20\u8f93\u7684\u9700\u6c42\uff09\u3002<\/p>\n
    5.2.1 \u5b8c\u6574\u4ee3\u7801<\/h3>\n
      \u901a\u8fc7\u4ee5\u4e0b\u7a0b\u5e8f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u4e32\u53e3\u901a\u4fe1\u3002<\/p>\n
    #include \n#include \n#include \n#include \n#include \n#include \nint main() {\n    int serial_port_num;\n    char serial_port[15];\n\n    printf(\"Select a serial port (3\/4): \");\n    scanf(\"%d\", &serial_port_num);   sprintf(serial_port,\"\/dev\/ttyS%d\",serial_port_num);\n    int serial_fd;\n\n    serial_fd = open(serial_port, O_RDWR | O_NOCTTY);\n    if (serial_fd == -1) {\n        perror(\"Failed to open serial port\");\n        return 1;\n    }\n\n    struct termios tty;\n    memset(&tty, 0, sizeof(tty));\n\n    if (tcgetattr(serial_fd, &tty) != 0) {\n        perror(\"Error from tcgetattr\");\n        return 1;\n    }\n\n    cfsetospeed(&tty, B9600);\n    cfsetispeed(&tty, B9600);\n\n    tty.c_cflag &= ~PARENB;\n    tty.c_cflag &= ~CSTOPB;\n    tty.c_cflag &= ~CSIZE;\n    tty.c_cflag |= CS8;\n\n    if (tcsetattr(serial_fd, TCSANOW, &tty) != 0) {\n        perror(\"Error from tcsetattr\");\n        return 1;\n    }\n\n    char tx_buffer[] = \"hello world!\\n\";\n    ssize_t bytes_written = write(serial_fd, tx_buffer, sizeof(tx_buffer));\n    if (bytes_written < 0) {\n        perror(\"Error writing to serial port\");\n        close(serial_fd);\n        return 1;\n    }\n    printf(\"\\rtx_buffer: \\n %s \", tx_buffer);\n\n    char rx_buffer[256];\n    int bytes_read = read(serial_fd, rx_buffer, sizeof(rx_buffer));\n    if (bytes_read > 0) {\n        rx_buffer[bytes_read] = '\\0';\n        printf(\"\\rrx_buffer: \\n %s \", rx_buffer);\n    } else {\n        printf(\"No data received.\\n\");\n    }\n\n    close(serial_fd);\n\n    return 0;\n}<\/code><\/pre>\n
    5.2.2 \u6253\u5f00\u4e32\u53e3<\/h3>\n
      \u8fd9\u6bb5\u4ee3\u7801\u9996\u5148\u8ba9\u7528\u6237\u9009\u62e9\u4f7f\u7528\u4e32\u53e33\u6216\u4e32\u53e34\u8fdb\u884c\u901a\u4fe1\uff0c\u7136\u540e\u6253\u5f00\u4e86\u76f8\u5e94\u7684\u4e32\u53e3\u8bbe\u5907\u6587\u4ef6\uff0c\u5c06\u5176\u6587\u4ef6\u63cf\u8ff0\u7b26\u4fdd\u5b58\u5728 serial_fd \u53d8\u91cf\u4e2d\u3002<\/p>\n
    printf(\"Select a serial port (3\/4): \");\nscanf(\"%d\", &serial_port_num);\n\nsprintf(serial_port,\"\/dev\/ttyS%d\",serial_port_num);\nint serial_fd;\n\nserial_fd = open(serial_port, O_RDWR | O_NOCTTY);\nif (serial_fd == -1) {\n    perror(\"Failed to open serial port\");\n    return 1;\n}<\/code><\/pre>\n
    5.2.3 \u914d\u7f6e\u4e32\u53e3<\/h3>\n
      \u5728\u8fd9\u90e8\u5206\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3a tty \u7684 termios \u7ed3\u6784\u4f53\uff0c\u7528\u4e8e\u914d\u7f6e\u4e32\u53e3\u901a\u4fe1\u7684\u53c2\u6570\u3002\u9996\u5148\uff0c\u6211\u4eec\u4f7f\u7528 memset \u5c06\u5176\u521d\u59cb\u5316\u4e3a0\u3002\u7136\u540e\uff0c\u901a\u8fc7 tcgetattr \u51fd\u6570\u83b7\u53d6\u5f53\u524d\u4e32\u53e3\u7684\u5c5e\u6027\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728 tty \u7ed3\u6784\u4f53\u4e2d\u3002<\/p>\n
    struct termios tty;\nmemset(&tty, 0, sizeof(tty));\n\nif (tcgetattr(serial_fd, &tty) != 0) {\n    perror(\"Error from tcgetattr\");\n    return 1;\n}<\/code><\/pre>\n
      \u5728\u8fd9\u90e8\u5206\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u8bbe\u7f6e\u4e86\u4e32\u53e3\u901a\u4fe1\u7684\u4e00\u4e9b\u53c2\u6570\u3002\u6211\u4eec\u4f7f\u7528 cfsetospeed \u548c cfsetispeed \u51fd\u6570\u5c06\u6ce2\u7279\u7387\u8bbe\u7f6e\u4e3a9600\uff0c\u5206\u522b\u7528\u4e8e\u8bbe\u7f6e\u8f93\u51fa\u548c\u8f93\u5165\u7684\u6ce2\u7279\u7387\uff1b\u6e05\u9664 PARENB \u6807\u5fd7\uff0c\u4ee5\u7981\u7528\u5947\u5076\u6821\u9a8c\uff1b\u901a\u8fc7 c_cflag \u5c5e\u6027\u64cd\u4f5c\u6807\u5fd7\u6765\u6e05\u9664 CSTOPB \u6807\u5fd7\uff0c\u4ee5\u4f7f\u7528\u4e00\u4e2a\u505c\u6b62\u4f4d\uff1b\u901a\u8fc7\u6e05\u9664 CSIZE \u6807\u5fd7\u6765\u6e05\u9664\u6570\u636e\u4f4d\uff0c\u5e76\u901a\u8fc7 CS8 \u6807\u5fd7\u6765\u8bbe\u7f6e\u6570\u636e\u4f4d\u4e3a8\u4f4d\u3002\u6700\u540e\uff0c\u4f7f\u7528 tcsetattr \u51fd\u6570\u5c06\u4fee\u6539\u540e\u7684\u5c5e\u6027\u8bbe\u7f6e\u4e3a\u4e32\u53e3\u7684\u5f53\u524d\u5c5e\u6027\uff0c\u8fd9\u91cc\u4f7f\u7528\u4e86 TCSANOW \u6807\u5fd7\uff0c\u8868\u793a\u7acb\u5373\u5e94\u7528\u8fd9\u4e9b\u8bbe\u7f6e\u3002<\/p>\n
    cfsetospeed(&tty, B9600);\ncfsetispeed(&tty, B9600);\n\ntty.c_cflag &= ~PARENB;\ntty.c_cflag &= ~CSTOPB;\ntty.c_cflag &= ~CSIZE;\ntty.c_cflag |= CS8;\n\nif (tcsetattr(serial_fd, TCSANOW, &tty) != 0) {\n    perror(\"Error from tcsetattr\");\n    return 1;\n}<\/code><\/pre>\n
    5.2.4 \u53d1\u9001\u6570\u636e<\/h3>\n
      \u8fd9\u6bb5\u4ee3\u7801\u901a\u8fc7\u5411 serial_fd \u5199\u5165\u5b57\u7b26\u4e32\u6570\u636e "hello world!\\n" \u4ee5\u5b9e\u73b0\u4e32\u53e3\u6570\u636e\u53d1\u9001\uff0c\u53d1\u9001\u6210\u529f\u5c06\u5728\u7ec8\u7aef\u6253\u5370\u6570\u636e\u3002<\/p>\n
    \nchar tx_buffer[] = \"hello world!\\n\";\nssize_t bytes_written = write(serial_fd, tx_buffer, sizeof(tx_buffer));\nif (bytes_written < 0) {\n    perror(\"Error writing to serial port\");\n    close(serial_fd);\n    return 1;\n}\nprintf(\"\\rtx_buffer: \\n %s \", tx_buffer);<\/code><\/pre>\n
    5.2.5 \u63a5\u6536\u6570\u636e<\/h3>\n
      \u8fd9\u6bb5\u4ee3\u7801\u901a\u8fc7\u4ece serial_fd \u8bfb\u53d6\u6570\u636e\u4ee5\u5b9e\u73b0\u4e32\u53e3\u6570\u636e\u63a5\u6536\uff0c\u63a5\u6536\u6210\u529f\u5c06\u5728\u7ec8\u7aef\u6253\u5370\u6570\u636e\u3002<\/p>\n
    char rx_buffer[256];\nint bytes_read = read(serial_fd, rx_buffer, sizeof(rx_buffer));\nif (bytes_read > 0) {\n    rx_buffer[bytes_read] = '\\0';\n    printf(\"\\rrx_buffer: \\n %s \", rx_buffer);\n} else {\n    printf(\"No data received.\\n\");\n}<\/code><\/pre>\n
    6 \u9a71\u52a8\u5c42\u89e3\u6790<\/h1>\n
      \u9a71\u52a8\u5c42\u9762\u662f\u57fa\u4e8etty\u5b50\u7cfb\u7edf\u5b9e\u73b0\u7684\uff0c\u56e0\u6b64\u4f7f\u7528\u65f6\u76f4\u63a5\u4f7f\u7528tty\u5b50\u7cfb\u7edf\u7684\u4e32\u53e3\u9a71\u52a8\uff0c\u6b63\u5e38\u60c5\u51b5\u4e0b\u4e0d\u9700\u8981\u9002\u914d\uff0c\u4f46\u8bfb\u8bfb\u9a71\u52a8\u4ee3\u7801\uff0c\u4e86\u89e3\u4e86\u89e3\u9a71\u52a8\u5b9e\u73b0\u8fd8\u662f\u5f88\u6709\u7528\u7684\uff0c\u6574\u4e2a\u5b50\u7cfb\u7edf\u8fdc\u6bd4spi\u548ci2c\u5b50\u7cfb\u7edf\u590d\u6742\uff0c\u8fd9\u5757\u7b49\u6211\u5236\u4f5c\u5b8c\u81ea\u5df1\u7684\u5f00\u53d1\u677f\u540e\u518d\u66f4\u65b0\u3002<\/p>\n
    6.1 \u4e32\u53e3\u4e0a\u7535\u6d41\u7a0b\u7684\u6d45\u6790<\/h2>\n
      \u5b66\u4e60\u4e32\u53e3\u65f6\u60f3\u5230232\u4e32\u53e3\u4e3a\u5565\u4e00\u4e0a\u7535\u5c31\u80fd\u8f93\u51fa\u7cfb\u7edf\u5f00\u673a\u7684\u4fe1\u606f\uff0c\u80af\u5b9a\u662f\u4e00\u5f00\u59cb\u5c31\u521d\u59cb\u5316\u4e86\u3002\u9996\u5148\u60f3\u5230\u4e86\u5f00\u673a\u542f\u52a8\u6d41\u7a0b\u4e2du-boot\u7684\u4f5c\u7528\u4e4b\u4e00\u5c31\u662f\u521d\u59cb\u5316\u4e32\u53e3\uff0c\u8fd9\u91cc\u4f1a\u914d\u7f6e\u9ed8\u8ba4\u7684\u6ce2\u7279\u7387\u6ce2\u7279\u7387\u7684\u6807\u51c6\u4e0e\u914d\u7f6e\uff1b\u518d\u7ed3\u5408Linux\u7684\u542f\u52a8\u6d41\u7a0b\uff1a<\/p>\n
      \n
    • Bootloader\u9636\u6bb5\uff1a<\/li>\n
    • \u745e\u82af\u5fae\u95ed\u6e90DDR bin\u9ed8\u8ba4\u6ce2\u7279\u7387\u4e3a1.5Mbps\uff0c\u9700\u901a\u8fc7ddrbin_param.txt\u4fee\u6539\u4e3a115200<\/li>\n
    • U-Boot\u7684CONFIG_BAUDRATE\u53c2\u6570\u901a\u5e38\u8bbe\u4e3a115200\u6216 1500000\uff0c\u9700\u4e0eDDR bin\u4e00\u81f4<\/li>\n
    • \u5185\u6838\u9636\u6bb5\uff1a<\/li>\n
    • \u8c03\u8bd5\u4e32\u53e3\u6ce2\u7279\u7387\u901a\u8fc7\u8bbe\u5907\u6811rockchip,baudrate\u5c5e\u6027\u5b9a\u4e49\uff0c\u652f\u6301 115200 \u6216 1.5Mbps<\/li>\n<\/ul>\n
        \u6240\u4ee5\u4e32\u53e3\u521d\u59cb\u5316\u7684\u540c\u65f6\uff0c\u5bf9\u5e94\u5230\u8c03\u8bd5\u754c\u9762\u7684\u6ce2\u7279\u7387\u5c31\u56fa\u5b9a\u4e86\uff08u-boot\u4e0e\u5185\u6838\u79fb\u690d\u65f6\u4e8c\u8005\u4f7f\u7528\u7684\u8bbe\u5907\u6811\u662f\u4e00\u6837\u7684\uff09\u3002
      \n  \u800c\u5230\u8fd9\u91cc\u53c8\u5ef6\u7533\u51fa\u4e00\u4e2a\u95ee\u9898\uff0c\u90a3\u521d\u59cb\u5316\u65f6\u662f\u6240\u6709\u5f15\u811a\u90fd\u521d\u59cb\u5316\u5417\uff1f\u6050\u6015\u4e0d\u662f\u5427\uff0c\u9996\u5148\u7528\u4e0d\u5230\u6240\u6709\u7684\u4e32\u53e3\uff0c\u5176\u6b21\u90fd\u521d\u59cb\u5316\u540e\u5b58\u5728\u4e00\u4e2a\u95ee\u9898\uff0c\u5f00\u673a\u65f6\u95f4\u4f1a\u5ef6\u957f\uff0c\u4ec5\u521d\u59cb\u5316\u4e32\u53e3\u7684\u65f6\u95f4\u56fa\u7136\u5f88\u77ed\uff0c\u4f46\u90fd\u8fd9\u4e2a\u601d\u8def\u6765\uff0c\u6240\u6709\u7684\u7ba1\u811a\u90fd\u6765\u4e00\u904d\uff0c\u90a3\u5f00\u673a\u65f6\u95f4\u5fc5\u7136\u8981\u52a0\u957f\u4e86\u3002
      \n  \u53c8\u67e5\u8d44\u6599\u5916\u52a0\u770brk3568\u7684\u6570\u636e\u624b\u518c\u53d1\u73b0\uff0c\u745e\u82af\u5fae\u7684\u9ed8\u8ba4\u8c03\u8bd5\u4e32\u53e3\u5f15\u811a\u662fuart2\u3002\u5982\u4e0b\u662f\u5bf9\u9ed8\u8ba4\u4e32\u53e3\u5f15\u811a\u7684\u786e\u8ba4\u5206\u6790\uff1a
      \n  1.Bootloader\u9636\u6bb5\u7684\u9ed8\u8ba4\u4e32\u53e3RK3568\u5e73\u53f0\u5728Bootloader\u9636\u6bb5\uff08\u5982U-Boot\uff09\u9ed8\u8ba4\u4f7f\u7528\u7279\u5b9aUART\u4f5c\u4e3a\u8c03\u8bd5\u4e32\u53e3\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u677f\u7ea7\u914d\u7f6e\uff1a<\/p>\n
        \n
      • \u745e\u82af\u5fae\u5b98\u65b9SDK\u9ed8\u8ba4\u5c06 UART2 \u4f5c\u4e3a\u8c03\u8bd5\u4e32\u53e3\uff08\u901a\u8fc7\u8bbe\u5907\u6811fiq-debugger\u8282\u70b9\u914d\u7f6e\uff09<\/li>\n
      • \u82e5\u60a8\u7684\u786c\u4ef6\u901a\u8fc7 UART0 \u5916\u63a5RS232\uff0c\u9700\u68c0\u67e5\u4ee5\u4e0b\u914d\u7f6e\uff1a<\/li>\n
      • \u786e\u8ba4\u5f00\u53d1\u677f\u539f\u7406\u56fe\u4e2dUART0\u662f\u5426\u88ab\u5b9a\u4e49\u4e3a\u8c03\u8bd5\u4e32\u53e3\u3002<\/li>\n
      • \u5728U-Boot\u7684\u8bbe\u5907\u6811\u6587\u4ef6\uff08\u5982rk3568-u-boot.dtsi\uff09\u4e2d\uff0c\u67e5\u770bfiq-debugger\u8282\u70b9\u7684rockchip,serial-id\u5c5e\u6027\u662f\u5426\u4e3a<0>\uff08\u5373UART0\uff09<\/li>\n<\/ul>\n
          2.\u5176\u4ed6\u4e32\u53e3\u7684\u521d\u59cb\u5316Bootloader\u901a\u5e38\u4ec5\u521d\u59cb\u5316\u8c03\u8bd5\u4e32\u53e3\uff0c\u5176\u4ed6UART\u9700\u624b\u52a8\u542f\u7528\uff1a<\/p>\n
          \n
        • \u975e\u8c03\u8bd5\u4e32\u53e3\u9ed8\u8ba4\u5904\u4e8e\u5173\u95ed\u72b6\u6001\uff08status = "disabled"\uff09<\/li>\n
        • \u82e5\u9700\u4f7f\u7528\u5176\u4ed6UART\uff08\u5982UART0\uff09\uff0c\u9700\u4fee\u6539\u8bbe\u5907\u6811\u5c06\u5176status\u8bbe\u4e3a"okay"\u3002<\/li>\n<\/ul>\n
            \u7efc\u5408\u4e0a\u8ff0\u5206\u6790\u786e\u8ba4\u4e86\u745e\u82af\u5fae\u7684\u9ed8\u8ba4\u521d\u59cb\u5316\u4e32\u53e3\u548c\u9ed8\u8ba4\u6ce2\u7279\u7387\u53c2\u6570\uff0c\u4e5f\u4ece\u5934\u5230\u5c3e\u5f04\u660e\u767d\u4e86\u4e32\u53e3\u8c03\u8bd5\u8f93\u51fa\u7684\u5168\u6d41\u7a0b\u548c\u5168\u8def\u5f84\u3002<\/p>\n
            \u5728\u67e5\u8be2\u4e32\u53e3\u65f6\u4e86\u89e3\u5230\u4e32\u53e3\u6709\u4e13\u95e8\u7684\u7c7b\u578b\u7f16\u53f7\uff0c\u901a\u8fc7\u7f16\u53f7\u53ef\u7cbe\u51c6\u8bc6\u522bUSB\u8bbe\u5907\u7c7b\u578b\uff0c\u5e76\u6709\u6548\u533a\u5206\u666e\u901a\u8bbe\u5907\u4e0e\u4e32\u53e3\u8f6c\u6362\u8bbe\u5907\u3002<\/p>\n\n\n\n\n\n\n\n\n
          \u8bbe\u5907\u7c7b\u578b<\/th>\n\u7279\u5f81\u6807\u8bc6<\/th>\n\u5178\u578bVID\/PID\u793a\u4f8b<\/th>\n<\/tr>\n<\/thead>\n
          \u666e\u901a\u5b58\u50a8\u8bbe\u5907<\/td>\n- bInterfaceClass=0x08<\/td>\n- 0781:5530\uff08SanDisk U\u76d8\uff09<\/td>\n<\/tr>\n
          HID\u8bbe\u5907\uff08\u952e\u9f20\uff09<\/td>\n- bInterfaceClass=0x03<\/td>\n-  046d:c52b\uff08\u7f57\u6280\u63a5\u6536\u5668\uff09<\/td>\n<\/tr>\n
          \u4e32\u53e3\u8f6cUSB\u8bbe\u5907<\/td>\n- bInterfaceClass=0x02\/0xFF\uff08\u5382\u5546\u81ea\u5b9a\u4e49\uff09<\/td>\n- 0403:6001\uff08FTDI\uff09<\/td>\n<\/tr>\n
          \u7f51\u7edc\u9002\u914d\u5668<\/td>\n- bInterfaceClass=0x0E\uff08\u65e0\u7ebf\u8bbe\u5907\u7c7b\uff09<\/td>\n- 0bda:8152\uff08Realtek\u7f51\u5361\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
          7 \u603b\u7ed3<\/h1>\n
            \u6ca1\u5565\u53ef\u603b\u7ed3\u7684\uff0c\u6574\u7bc7\u5185\u5bb9\u662f\u5728\u6211\u5b66\u4e60\u4e32\u53e3\u5185\u5bb9\u662f\u878d\u4f1a\u8d2f\u901a\u540e\u6574\u7406\u7684\u4e00\u7bc7\u7b14\u8bb0\uff0c\u6dfb\u52a0\u4e86\u6211\u7684\u4e00\u70b9\u601d\u8003\u603b\u7ed3\u800c\u5df2\uff0c\u6bd4\u8f83\u6d45\u663e\u3002\u6709\u5565\u4e0d\u61c2\u7684\u53ef\u4ee5\u53d1\u6211\u90ae\u7bb1\u8ba8\u8bba\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          1 \u524d\u8a00   \u4e32\u53e3\u901a\u4fe1\u534f\u8bae\u4e0espi\u3001i2c\u662f\u5d4c\u5165\u5f0f\u57fa\u7840\u76843\u4e2a\u901a\u4fe1\u534f\u8bae\u3002\u4e4b\u524d\u4ec5\u5728\u8c03\u8bd5\u8bbe\u5907\u65f6\u4f7f […]<\/p>\n","protected":false},"author":1,"featured_media":810,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55],"tags":[],"class_list":["post-766","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-55"],"_links":{"self":[{"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/posts\/766","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=766"}],"version-history":[{"count":41,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/posts\/766\/revisions"}],"predecessor-version":[{"id":809,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/posts\/766\/revisions\/809"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/media\/810"}],"wp:attachment":[{"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=766"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=766"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=766"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}