Quick read of serial port in Go

serial-read.go

package main

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

// Command Line Args
// EX: ./serial -com=COM1 -baud=115200
var (
	com  string
	baud int
)

// Set Defaults
func init() {
	flag.StringVar(&com, "com", "COM1", "The COM port to read data from")
	flag.IntVar(&baud, "baud", 115200, "The Baud Rate")
}

func main() {

	flag.Parse()

	// Program Info
	log.Printf("Starting with port %s at baud rate %d", com, baud)

	// Setup Serial Port
	c := &serial.Config{Name: com, Baud: baud}
	s, err := serial.OpenPort(c)
	if err != nil {
		log.Fatal(err)
	}

	log.Print("Reading Bytes in...")

	buf := make([]byte, 2048)

	r, err := s.Read(buf)
	if err != nil {
		log.Fatal(err)
	}

	// Print Bytes Read
	log.Printf("% #x ", buf[:r])
	file, err := os.Create("test.txt")
	if err != nil {
		log.Fatal(err)
	}

	defer file.Close()

	w := bufio.NewWriter(file)
	for _, abyte := range buf {
		fmt.Fprintf(w, "% #x ", abyte)
	}
	write_err := w.Flush()

	if write_err != nil {
		log.Fatal(write_err)
	}
}