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社区首页 >问答首页 >node-serialport组合JSON块

问node-serialport组合JSON块
EN

Stack Overflow用户
提问于 2020-12-19 05:25:24
回答 1查看 24关注 0票数 1

我有一个Raspberry PI通过串行端口连接到ESP32控制器

我能够读取从串口接收的数据(控制器以多个块的形式发送大型JSON )

代码语言：javascript
复制
serial = new SerialPort(
    usb, {
      baudRate: 115200,
      dataBits: 8,
      parity: 'none',
      stopBits: 1,
    }, err => {
  
      if (!!err) {
        isOpened = false
        const error = 'Error opening serial port: ' + u.stringify(err)
        handleError(error)
      }else{
        isOpened = true
        log.info(sig, 'Serial Port opened')
      }
  })

如果没有解析器，数据将如下所示：

代码语言：javascript
复制
    2020/12/18 21:03:48.956 info:  [SERI write] message sent

    2020/12/18 21:03:49.020 debug:  [SERI handleData] Data: {
        "type": "answer",
        "orig_message": {
            "type": "message",
            "command":  "identify"
        },
        "timestamp":    1608239027,
        "heap-size":    284132,
        "controller":   "MM1",
        "firmware": "0.1-ex",
        "io":   [{
                "name": "I1",
                "type": "input"
            }, {
                "nam
    2020/12/18 21:03:49.037 debug:  [SERI handleData] Data: e": "I2",
                "type": "input"
            }, {
                "name": "I3",
                "type": "input"
            }, {
                "name": "I4",
                "type": "input"
            }, {
                "name": "I5",
                "type": "input"
            }, {
                "name": "I6",
                "type": "input"
            }, {
                "name": "I7",
                "type": "inp
    2020/12/18 21:03:49.059 debug:  [SERI handleData] Data: ut"
            }, {
                "name": "TO.0",
                "type": "output"
            }, {
                "name": "TO.1",
                "type": "output"
            }, {
                "name": "A0",
                "type": "analog"
            }, {
                "name": "A1",
                "type": "analog"
            }, {
                "name": "A2",
                "type": "analog"
            }, {
                "
    2020/12/18 21:03:49.071 debug:  [SERI handleData] Data: name":  "A3",
                "type": "analog"
            }, {
                "name": "A4",
                "type": "analog"
            }, {
                "name": "A5",
                "type": "analog"
            }],
        "error":    0
    }

添加解析器后(尝试了多个不同的解析器)，数据将显示为单独的行：

解析器：

代码语言：javascript
复制
const parser = serial.pipe(new Readline({ delimiter: '\r\n', encoding: 'utf8' }))

  parser.on('data', data => {
    handleData(data)
  })

结果：

代码语言：javascript
复制
2020/12/18 20:28:03.137 info:  [SERI write] message sent
2020/12/18 20:28:03.208 debug:  [SERI handleData] Data: {
2020/12/18 20:28:03.211 debug:  [SERI handleData] Data:     "type": "answer",
2020/12/18 20:28:03.212 debug:  [SERI handleData] Data:     "orig_message": {
2020/12/18 20:28:03.214 debug:  [SERI handleData] Data:         "type": "message",
2020/12/18 20:28:03.215 debug:  [SERI handleData] Data:         "command":  "identify"
2020/12/18 20:28:03.217 debug:  [SERI handleData] Data:     },
2020/12/18 20:28:03.218 debug:  [SERI handleData] Data:     "timestamp":    1608236881,
2020/12/18 20:28:03.220 debug:  [SERI handleData] Data:     "heap-size":    284132,
2020/12/18 20:28:03.221 debug:  [SERI handleData] Data:     "controller":   "MM1",
2020/12/18 20:28:03.222 debug:  [SERI handleData] Data:     "firmware": "0.1-ex",
2020/12/18 20:28:03.224 debug:  [SERI handleData] Data:     "io":   [{
2020/12/18 20:28:03.225 debug:  [SERI handleData] Data:             "name": "I1",
2020/12/18 20:28:03.227 debug:  [SERI handleData] Data:             "type": "input"
2020/12/18 20:28:03.228 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.235 debug:  [SERI handleData] Data:             "name": "I2",
2020/12/18 20:28:03.237 debug:  [SERI handleData] Data:             "type": "input"
2020/12/18 20:28:03.238 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.239 debug:  [SERI handleData] Data:             "name": "I3",
2020/12/18 20:28:03.240 debug:  [SERI handleData] Data:             "type": "input"
2020/12/18 20:28:03.241 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.242 debug:  [SERI handleData] Data:             "name": "I4",
2020/12/18 20:28:03.243 debug:  [SERI handleData] Data:             "type": "input"
2020/12/18 20:28:03.244 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.245 debug:  [SERI handleData] Data:             "name": "I5",
2020/12/18 20:28:03.246 debug:  [SERI handleData] Data:             "type": "input"
2020/12/18 20:28:03.247 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.248 debug:  [SERI handleData] Data:             "name": "I6",
2020/12/18 20:28:03.249 debug:  [SERI handleData] Data:             "type": "input"
2020/12/18 20:28:03.250 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.251 debug:  [SERI handleData] Data:             "name": "I7",
2020/12/18 20:28:03.257 debug:  [SERI handleData] Data:             "type": "input"
2020/12/18 20:28:03.259 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.260 debug:  [SERI handleData] Data:             "name": "TO.0",
2020/12/18 20:28:03.261 debug:  [SERI handleData] Data:             "type": "output"
2020/12/18 20:28:03.262 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.263 debug:  [SERI handleData] Data:             "name": "TO.1",
2020/12/18 20:28:03.264 debug:  [SERI handleData] Data:             "type": "output"
2020/12/18 20:28:03.264 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.265 debug:  [SERI handleData] Data:             "name": "A0",
2020/12/18 20:28:03.266 debug:  [SERI handleData] Data:             "type": "analog"
2020/12/18 20:28:03.267 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.268 debug:  [SERI handleData] Data:             "name": "A1",
2020/12/18 20:28:03.269 debug:  [SERI handleData] Data:             "type": "analog"
2020/12/18 20:28:03.270 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.271 debug:  [SERI handleData] Data:             "name": "A2",
2020/12/18 20:28:03.272 debug:  [SERI handleData] Data:             "type": "analog"
2020/12/18 20:28:03.273 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.274 debug:  [SERI handleData] Data:             "name": "A3",
2020/12/18 20:28:03.275 debug:  [SERI handleData] Data:             "type": "analog"
2020/12/18 20:28:03.276 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.277 debug:  [SERI handleData] Data:             "name": "A4",
2020/12/18 20:28:03.278 debug:  [SERI handleData] Data:             "type": "analog"
2020/12/18 20:28:03.279 debug:  [SERI handleData] Data:         }, {
2020/12/18 20:28:03.280 debug:  [SERI handleData] Data:             "name": "A5",
2020/12/18 20:28:03.280 debug:  [SERI handleData] Data:             "type": "analog"
2020/12/18 20:28:03.281 debug:  [SERI handleData] Data:         }],
2020/12/18 20:28:03.282 debug:  [SERI handleData] Data:     "error":    0
2020/12/18 20:28:03.283 debug:  [SERI handleData] Data: }

那么，如何将这些块组合成一个完整的JSON对象呢？

raspberry-pi
node-serialport
EN

回答 1

Stack Overflow用户

发布于 2020-12-19 21:54:26

好的，看起来我找到了一些变通方法，不确定它是否是最好的：

我使用的是库stream-json

我在串行流中添加了一个解析器：

代码语言：javascript
复制
const stream = serial.pipe(parser())

然后附加来自同一个库的汇编程序：

代码语言：javascript
复制
const assembler = Assembler.connectTo(stream)

  assembler.on('done', asm => {
    handleData(asm.current)
  })

这给了我完整的JavaScript对象：

代码语言：javascript
复制
Data: {"type":"answer","orig_message":{"type":"message","command":"identify"},"timestamp":1608299108,"heap-size":284132,"controller":"MM1","firmware":"0.1-ex","io":[{"name":"I1","type":"input"},{"name":"I2","type":"input"},{"name":"I3","type":"input"},{"name":"I4","type":"input"},{"name":"I5","type":"input"},{"name":"I6","type":"input"},{"name":"I7","type":"input"},{"name":"TO.0","type":"output"},{"name":"TO.1","type":"output"},{"name":"A0","type":"analog"},{"name":"A1","type":"analog"},{"name":"A2","type":"analog"},{"name":"A3","type":"analog"},{"name":"A4","type":"analog"},{"name":"A5","type":"analog"}],"error":0}
票数 1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/65364106

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