How to Achieve Continuous Serial Port Data Reading Using a While-Loop in Go?

Using a While-Loop to Continuously Read Data from a Serial Port

When interacting with sensors or devices through serial ports, it's often necessary to read incoming data continuously. In this context, the question arises - how to achieve this using a while-loop?

Consider an example Go program used for serial communication:

<code class="go">package main

import (
    "fmt"
    "github.com/tarm/goserial"
    "time"
)

func main() {
    // ... (code to open the serial port and write data)

    time.Sleep(time.Second / 2)

    var buf []byte

    for {
        n, err := s.Read(buf)

        if n > 0 {
            break
        }
    }

    fmt.Println(string(buf[:n]))

    // ... (code to close the serial port)
}</code>

In this snippet, the initial attempt to create a while-loop for continuous reading doesn't work as expected. Unlike a blocking Read() function, the serial package's Read() method returns immediately, even if no data is available. This behavior leads to the overwriting of the buffer and an inability to capture all the incoming data.

To address this issue, a more robust approach is to use a bufio.Reader, which provides buffering capabilities. By using a reader with a defined delimiter (for example, "x0a" for a newline character), one can continuously read until the delimiter is encountered.

Here's a modified code snippet that incorporates this approach:

<code class="go">package main

import (
    "bufio"
    "fmt"
    "github.com/tarm/goserial"
)

func main() {
    // ... (code to open the serial port and write data)

    // Create a bufio.Reader with a defined delimiter
    reader := bufio.NewReader(s)

    // Continuously read data until the delimiter is encountered
    reply, err := reader.ReadBytes('\x0a')

    // Print the received data
    fmt.Println(string(reply))

    // ... (code to close the serial port)
}</code>

By incorporating this change, the program can now read incoming data continuously and reliably, regardless of the data stream rate.

The above is the detailed content of How to Achieve Continuous Serial Port Data Reading Using a While-Loop in Go?. For more information, please follow other related articles on the PHP Chinese website!