move to utils package

utils/serial.go

@@ -0,0 +1,45 @@
+package utils
+
+import (
+	"github.com/tarm/serial"
+	"io"
+	"log"
+	"time"
+)
+
+var(
+	device string
+	baudrate int
+	bytesize byte
+	port  *serial.Port
+	portOpened bool
+)
+
+func OpenPort(device string, baudrate int, bytesize byte) error {
+	log.Println("opening port device:", device, ", baudrate=", baudrate, ", bytesize=",bytesize)
+	config := &serial.Config{Name: device, Baud: baudrate, Size: bytesize, ReadTimeout: time.Second * 1}
+	var err error
+	port, err = serial.OpenPort(config)
+	if err!=nil {
+		log.Fatalln("error in open serial port ",   err)
+		return err
+	}
+	log.Println("opened port ", port)
+	portOpened = true
+	return nil
+}
+
+func ReadPort() ([]byte, int){
+	buffer := make([]byte, 256)
+	count,err := port.Read(buffer)
+	if err != nil && err != io.EOF {
+		log.Println("error in read port ", err)
+		//TODO: 3 time fail try to
+	}
+	return buffer, count
+}
+
+func IsPortOpen() bool {
+	return portOpened
+}
+