Add write timeout and get error command

Signed-off-by: Maartje Eyskens <[email protected]>

const.go

@@ -34,3 +34,12 @@ const (
 	// function type B
 	BarcodeTypeCODE128 BarcodeType = "\x49"
 )
+
+type ErrorStatus byte
+
+const (
+	ErrorNone      ErrorStatus = 0x00
+	ErrorCoverOpen ErrorStatus = 0x04
+	ErrorPaperOut  ErrorStatus = 0x20
+	ErrorGeneric   ErrorStatus = 0x40
+)

demo/main.go

@@ -13,7 +13,12 @@ func main() {
 		return
 	}
 
-	p.Init()
+	err = p.Init()
+	if err != nil {
+		fmt.Print(err)
+		return
+	}
+
 	p.Smooth(true)
 	p.Size(2, 2)
 	p.PrintLn("HELLO GO")
@@ -42,4 +47,6 @@ func main() {
 	p.Feed(2)
 	p.Cut()
 	p.End()
+	// do the next piece of work
+
 }

epson.go

@@ -7,6 +7,9 @@ import (
 	"os"
 	"path"
 	"strings"
+	"time"
+
+	"github.com/davecgh/go-spew/spew"
 
 	"github.com/bjarneh/latinx"
 )
@@ -15,6 +18,7 @@ var ErrorNoDevicesFound = errors.New("No devices found")
 
 type Printer struct {
 	s io.ReadWriteCloser
+	f *os.File
 }
 
 // NewUSBPrinter returns a new printer with a USb Vendor and Product ID
@@ -44,10 +48,14 @@ func NewUSBPrinterByPath(devpath string) (*Printer, error) {
 	}
 	return &Printer{
 		s: f,
+		f: f,
 	}, nil
 }
 
 func (p *Printer) write(cmd string) error {
+	if p.f != nil {
+		p.f.SetWriteDeadline(time.Now().Add(10 * time.Second))
+	}
 	_, err := p.s.Write([]byte(cmd))
 	return err
 }
@@ -183,3 +191,19 @@ func (p *Printer) Barcode(barcode string, format BarcodeType) error {
 
 	return p.Print(fmt.Sprintf("%s", barcode))
 }
+
+func (p *Printer) GetErrorStatus() (ErrorStatus, error) {
+	_, err := p.s.Write([]byte{0x10, 0x04, 0x02})
+	if err != nil {
+		return 0, err
+	}
+	data := make([]byte, 1)
+	_, err = p.s.Read(data)
+	if err != nil {
+		return 0, err
+	}
+
+	spew.Dump(data)
+
+	return ErrorStatus(data[0]), nil
+}