How to Read Data from a Serial Port Continuously with a While-Loop in Go?

Reading from Serial Port with While-Loop in Go

In Go, reading from a serial port requires understanding how Read() operates. While the original program used time.Sleep to pause before reading, a while-loop approach is often preferred for continuous data acquisition. However, it presents a challenge due to the behavior of Read().

In the while-loop implementation, Read() will return data whenever it is available, potentially overwriting the buffer with each loop iteration. To resolve this issue, we need to wait until all incoming data has been received before reading.

One solution is to use a bufio.Reader, which provides a buffered interface for reading from a stream. It allows us to specify a delimiter, such as 'x0a' (line break), and wait until that delimiter is encountered before returning the data.

The revised code below demonstrates how to use bufio.Reader to read data from a serial port until the 'x0a' delimiter is received:

<code class="go">reader := bufio.NewReader(s)
reply, err := reader.ReadBytes('\x0a')
if err != nil {
    panic(err)
}
fmt.Println(reply)</code>

This code will wait until the 'x0a' delimiter is received before returning the data in the 'reply' variable. The buffer used by bufio.Reader ensures that data is not overwritten during multiple Read() calls.

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