{"id":152,"date":"2017-04-11T19:35:56","date_gmt":"2017-04-11T11:35:56","guid":{"rendered":"https:\/\/himmel.tech\/wp\/?p=152"},"modified":"2017-04-11T20:53:12","modified_gmt":"2017-04-11T12:53:12","slug":"%e5%bc%80%e5%8f%91%e6%97%a5%e5%bf%97-170411","status":"publish","type":"post","link":"https:\/\/himmel.tech\/wp\/?p=152","title":{"rendered":"\u5f00\u53d1\u65e5\u5fd7 170411"},"content":{"rendered":"

\u4e4b\u524d\u4e00\u5468\u4e00\u76f4\u5728\u5f04I2C\u548cUART\uff0c\u611f\u89c9\u4e5f\u6ca1\u505a\u592a\u591a\u7684\u4e1c\u897f\uff0c\u5c31\u6ca1\u5355\u72ec\u5199\uff0c\u4eca\u5929\u7b97\u662f\u4e00\u8d77\u8bb0\u4e86\u3002\u53e6\u5916\u4eca\u5929\u201c\u6d77\u8bd5\u201d\uff0c\u9065\u63a7\u65b9\u9762\u6ca1\u5565\u5927\u6bdb\u75c5\uff0c\u8239\u4e5f\u4e0d\u6f0f\u6c34\u3002\u4e0d\u8fc7\u5c31\u662f\u4e00\u6b21\u4e0b\u6c34\u88ab\u6c34\u8349\u7f20\u4f4f\u4e86\uff1b\u6e05\u7406\u4e86\u6c34\u8349\u7b2c\u4e8c\u6b21\u4e0b\u6c34\uff0cL298N\u9a71\u52a8\u82af\u7247\u8fc7\u70ed\u4fdd\u62a4\u4e86\uff0c\u8239\u9014\u4e2d\u5931\u63a7\uff0c\u5dee\u70b9\u88ab\u6c34\u6d47\u4e86\uff0c\u4e5f\u633a\u60ca\u9669\u7684\u3002<\/p>\n

\"\"<\/p>\n

\u770b\u5230\u5de6\u4fa7\u90a3\u4e2a\u55b7\u6c34\u7684\u73a9\u610f\u4e86\u5417\uff1f\u5931\u63a7\u540e\uff0c\u4e0d\u504f\u4e0d\u501a\u5c31\u4ece\u90a3\u4e2a\u6c34\u67f1\u4e0b\u9762\u94bb\u8fc7\u53bb\u4e86\u3002\u4e09\u4e2a\u4eba\u5dee\u70b9\u5413\u5c3f\u4e86\uff0c\u4e5f\u6ca1\u60f3\u8d77\u6765\u62cd\u7167\u7247\uff0c\u53ef\u60dc\u4e86xD<\/p>\n

\u7b80\u5355\u6765\u8bf4\uff0c\u6811\u8393\u6d3e\u7684I2C\u548cUART\u8981\u7528raspi-config\u6253\u5f00\uff0c\u6216\u8005\u76f4\u63a5\u7f16\u8f91\/boot\/config.txt\u4e5f\u53ef\u4ee5\uff0c\u7136\u540e\u5c31\u53ef\u4ee5\u7528\u4e86\u3002\u7136\u540e\u5728\u7a0b\u5e8f\u4e2d\u4f5c\u4e3a\u6587\u4ef6\u6253\u5f00\uff0c\u4f7f\u7528ioctl\u8bbe\u5b9a\u4e86\u6a21\u5f0f\uff0c\u5c31\u53ef\u4ee5\u7b80\u5355\u7684\u7528read(), write()\u8fd9\u4e24\u4e2a\u51fd\u6570\u8bfb\u5199\u4e86\u3002<\/p>\n

\u54e6\uff0c\u5bf9\u4e86\uff0c\u8fd8\u4fee\u590d\u4e86\u4e00\u4e2a\u5b89\u5353\u9065\u63a7\u5668\u5728\u70ed\u70b9\u6a21\u5f0f\u4e0b\u4e0d\u80fd\u9065\u63a7\u8239\u7684bug\u3002\u70ed\u70b9\u6a21\u5f0f\u4e0b\uff0c\u53d7\u9650\u5e7f\u64ad\u4f3c\u4e4e\u4e0d\u4f1a\u53d1\u5230\u70ed\u70b9\u4e0b\u9762\u90a3\u4e2a\u5b50\u7f51\uff0c\u800c\u662f\u4f1a\u53d1\u52304G\u90a3\u8fb9\uff0c\u7ec4\u64ad224.0.0.1\u4f3c\u4e4e\u4e5f\u662f\u3002\u56e0\u6b64\u9700\u8981\u7528Multicast::setNetworkInterface\u6307\u5b9a\u8981\u7528\u7684\u7f51\u7edc\u63a5\u53e3\uff0c\u7136\u540e\u5411224.0.0.1\u53d1\u9001\u7ec4\u64ad\u3002<\/p>\n

<\/p>\n

\u5148\u8bf4\u4e32\u53e3\uff0c\u6211\u7528\u7684\u6811\u8393\u6d3e3b\uff0c\u542c\u8bf41\u548c2\u8fd8\u597d\uff0c3\u7684\u72ec\u7acb\u4e32\u53e3\u662f\u6ca1\u6709\u65f6\u949f\u6e90\u7684\uff0c\u9760\u5185\u6838\u63d0\u4f9b\u65f6\u949f\uff0c\u4f46\u5185\u6838\u65f6\u949f\u53c8\u4e0d\u662f\u5f88\u9760\u8c31\uff0c\u6240\u4ee5\u6709\u65f6\u5019\u4f1a\u5931\u7075\u3002\u6211\u5b9e\u9645\u4f7f\u7528\u65f6\uff0c\u611f\u89c9\u4e5f\u662f\u65f6\u597d\u65f6\u574f\u7684\uff0c\u5e72\u8106\u628a\u7956\u4f20\u7684PL2303\u7ed9\u63d2\u4e86\u4e0a\u53bb\uff0c\u6539\u7528\/dev\/ttyUSB0\uff0c\u6bd4\u539f\u6765\u7a33\u5b9a\u7684\u591a\u3002<\/p>\n

\u53e6\u5916\u4e32\u53e3\u4e00\u5927\u8c03\u8bd5\u795e\u5668\uff0cminicom\u3002\u975e\u5e38\u597d\u7528\uff0c\u5148sudo minicom -s\u8bbe\u7f6e\u4e86\u53c2\u6570\uff0c\u7136\u540esave as dfl\uff0c\u4e4b\u540e\u6bcf\u6b21minicom\u5c31\u884c\u4e86\u3002\u4e0d\u8fc7minicom\u662f\u6309\u4e00\u4e2a\u952e\u53d1\u9001\u4e00\u4e2a\u952e\u7684ASCII\u7801\uff0c\u6709\u65f6\u5019\u53ef\u80fd\u4e5f\u4f1a\u4e0d\u592a\u65b9\u4fbf\uff0c\u8fd9\u662f\u5c31\u9700\u8981echo “XXX” > \/dev\/ttyUSB0\u4e86\u3002<\/p>\n

I2C\u7684\u8bdd\uff0c\u6709\u4e00\u4e2ai2c-tools\uff0c\u91cc\u9762\u6709i2cdetect i2cdump i2cget i2cset\uff0c\u5206\u522b\u53ef\u4ee5\u7528\u6765\u63a2\u6d4bi2c\u8bbe\u5907\uff0cdump\u67d0\u5668\u4ef6\u6240\u6709\u5bc4\u5b58\u5668\u7684\u503c\uff0c\u83b7\u53d6\/\u8bbe\u7f6e\u67d0\u4e2a\/\u67d0\u51e0\u4e2a\u5bc4\u5b58\u5668\u7684\u503c\uff0c\u975e\u5e38\u65b9\u4fbf\u3002\u5177\u4f53\u4f7f\u7528\u8bf7\u770bman\u9875\u9762\u3002<\/p>\n

\u90a3\u4e48\uff0c\u7a0b\u5e8f\u4e2d\u5982\u4f55\u4f7f\u7528\u8fd9\u51e0\u4e2a\u63a5\u53e3\u5462\uff1f\u521d\u59cb\u5316\u7684\u65f6\u5019\u8981\u7279\u522b\u8bbe\u7f6e\u4e00\u4e0b\uff0c\u5176\u4ed6\u7684\u5c31\u666e\u901a\u7684read\u548cwrite\u5c31\u53ef\u4ee5\u4e86\uff0c\u8ddfLinux\u4e0b\u8bfb\u5199\u6587\u4ef6\u662f\u4e00\u6837\u7684\u3002<\/p>\n

\u4e32\u53e3\uff1a\u521d\u59cb\u5316\u7684\u65f6\u5019\u6253\u5f00\u8bbe\u5907\u6587\u4ef6\uff0c\u5e76\u8bbe\u7f6e\u4e32\u53e3\u53c2\u6570\uff0c\u7136\u540e\u8bfb\u5199\u3002<\/p>\n

int Serial::bind(std::string device) {\n        fd = open(device.c_str(), O_RDWR | O_NOCTTY);\n        struct termios tio;\n        if (fd <0)\n                throw Serial_Exception(Serial_Exception::Device_Not_Found);\n        bzero(&tio, sizeof(tio));\n        tio.c_cflag = B115200 | CS8 | CLOCAL | CREAD; \/\/ 115200 8N1\n        tio.c_iflag = 0;\n        tio.c_oflag = 0;\n        tio.c_lflag = ICANON;\n        tcflush(fd, TCIFLUSH);\n        tcsetattr(fd,TCSANOW,&tio);\n}\n\nvoid\u00a0Serial::write(std::string\u00a0data)\u00a0{\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0(::write(fd,\u00a0data.c_str(),\u00a0data.size())!=data.size())\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0throw\u00a0Serial_Exception(Serial_Exception::Fail_to_Write);\n\n}\n\nstd::string\u00a0Serial::getline()\u00a0{\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0const\u00a0int\u00a0buffer_size\u00a0=\u00a0256;\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0char\u00a0buffer[buffer_size\u00a0+\u00a01];\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0nbytes\u00a0=\u00a0read(fd,\u00a0buffer,\u00a0buffer_size);\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0buffer[nbytes]\u00a0=\u00a00;\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0std::string\u00a0data(buffer);\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while\u00a0(buffer[nbytes-1]\u00a0!=\u00a0'\\n')\u00a0{\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0nbytes\u00a0=\u00a0read(fd,\u00a0buffer\u00a0,buffer_size);\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0buffer[nbytes]\u00a0=\u00a00;\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0data.append(buffer);\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0data;\n\n}\n\n\n<\/pre>\n
I2C\uff1a\u521d\u59cb\u5316\u7684\u65f6\u5019\u6253\u5f00\u8bbe\u5907\u6587\u4ef6\uff0c\u5e76\u6307\u5b9a\u8bbe\u5907\u5730\u5740\uff0c\u7136\u540e\u5199\u5730\u5740\uff0c\u8bfb\u5199\/\u7a81\u53d1\u8bfb\u5199\u6570\u636e\u3002<\/p>\n
void I2C_Device::bind(int deviceID) {\n        fd = open(szI2CFilename, O_RDWR);\n        if (fd < 0)\n                throw I2C_Exception(I2C_Exception::Device_Not_Exist);\n        if (ioctl(fd, I2C_SLAVE, deviceID) < 0)\n                throw I2C_Exception(I2C_Exception::Device_Not_Exist);\n}\n\nvoid I2C_Device::setRegister(uint8_t registerID, uint8_t val) {\n        unsigned char data[2] = {registerID, val};\n        for (int i = RetryLimit; i; --i) {\n                if (write(fd, data, 2) == 2)\n                        return;\n        }\n        throw I2C_Exception(I2C_Exception::Retry_Limit);\n}\n\nuint8_t I2C_Device::getRegister(uint8_t registerID) {\n        int val;\n        for (int i = RetryLimit; i; --i)\n                if (write(fd, &registerID, 1) == 1)\n                        if (read(fd, &val, 1) == 1)\n                                return val;\n        throw I2C_Exception(I2C_Exception::Retry_Limit);\n}\n\nI2C_Device::~I2C_Device() {\n        close(fd);\n}\n<\/pre>\n
\u5176\u5b9e\u8fd8\u86ee\u7b80\u5355\u7684\uff1f<\/p>\n
\u6d77\u8bd5\u6709\u60ca\u65e0\u9669\u7684\uff0c\u867d\u7136\u9a71\u52a8\u80fd\u529b\u4e0d\u591f\u662f\u4e2a\u5927\u95ee\u9898\uff0c\u4f46\u597d\u6b79\u6ca1\u62a5\u5e9f\u2026\u2026\u8fd8\u884c\u8fd8\u884c\uff0c\u4e5f\u6ca1\u767d\u6362\u5fae\u4fe1\u7684\u8fd9\u4e2a\u5934\u50cf\u3002<\/p>\n
\u53ef\u4ee5\uff0c\u8fd9\u5f88\u5409\u7965\u7269\u3002<\/p>\n
\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e4b\u524d\u4e00\u5468\u4e00\u76f4\u5728\u5f04I2C\u548cUART\uff0c\u611f\u89c9\u4e5f\u6ca1\u505a\u592a\u591a\u7684\u4e1c\u897f\uff0c\u5c31\u6ca1\u5355\u72ec\u5199\uff0c\u4eca\u5929\u7b97\u662f\u4e00\u8d77\u8bb0\u4e86\u3002\u53e6\u5916\u4eca\u5929\u201c\u6d77\u8bd5\u201d\uff0c\u9065\u63a7\u65b9 … <\/p>\n
\u7ee7\u7eed\u9605\u8bfb\u201c\u5f00\u53d1\u65e5\u5fd7 170411\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[2],"tags":[],"class_list":["post-152","post","type-post","status-publish","format-standard","hentry","category-development-diary"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p83CFH-2s","_links":{"self":[{"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=\/wp\/v2\/posts\/152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=152"}],"version-history":[{"count":4,"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=\/wp\/v2\/posts\/152\/revisions"}],"predecessor-version":[{"id":159,"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=\/wp\/v2\/posts\/152\/revisions\/159"}],"wp:attachment":[{"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/himmel.tech\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}