Nodejs映射串口写入接收数据 [英] Nodejs map serial port write to receive data

问题描述

我目前正在使用 node-serialport 模块进行串口通信.我将发送一个命令 ATEC，它会以 ECHO 响应.

I am currently using node-serialport module for serial port communication. I will send a command ATEC and it will respond with ECHO.

但是，这个发送和接收数据的过程是异步的(发送数据后，在data事件中不知道数据什么时候到达)，示例代码如下:

However, this process of sending and receiving data is async(after i send the data, i will not know when the data will arrive in the data event), the example code is below:

//Register the data event from the serial port
port.on('data', (data) => {
    console.log(data);
});

//Send data using serialport
port.write('ATEC');

无论如何我可以这样写吗?

Is there anyway I could write it in this way?

//When i send the command, I could receive the data
port.write('ATEC').then((data)=> {
    console.log(data);
});

这有可能实现吗?

在使用 request 客户端的 http 通信中，我们可以做一些类似

In http communication using request client, we could do something like

request.get('http:\\google.com')
    .on('response', (res) => {
        console.log(res);
    });

我想使用 serialport

推荐答案

I wrap a promise in the serial data receive

I wrap a promise in the serial data receive

function sendSync(port, src) {
    return new Promise((resolve, reject) => {
        port.write(src);
        port.once('data', (data) => {
            resolve(data.toString());
        });

        port.once('error', (err) => {
            reject(err);
        });
    });
}

请注意，事件使用 once 而不是 on 来防止事件堆叠(请查看下面的评论以获取更多信息 - 感谢 @DKebler 发现它)

Please take note, the event is using once instead of on to prevent event from stacking (please check the comments below for more information - thanks @DKebler for spotting it)

然后，我可以同步编写如下代码

Then, I could write the code in sync as below

sendSync(port, 'AThello\n').then((data) => {
    //receive data
});

sendSync(port, 'ATecho\n').then((data) => {
    //receive data
});

或者我可以使用生成器，使用 co 包

or I could use a generator, using co package

 co(function* () {
        const echo = yield sendSync(port, 'echo\n');
        const hello = yield sendSync(port, 'hello 123\n');

        return [echo, hello]
    }).then((result) => {
        console.log(result)
    }).catch((err) => {
        console.error(err);
    })

这篇关于Nodejs映射串口写入接收数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！