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package main
import (
"io"
"log"
"os"
"time"
)
func decodeBitfieldErrors(b byte, errors [8]string) []string {
var result []string
for i := uint(0); i < 8; i++ {
if b&(1<<i) != 0 {
result = append(result, errors[i])
}
}
return result
}
// -----------------------------------------------------------------------------
type brotherStatus struct {
errors []string
}
// TODO: What exactly do we need? Probably extend as needed.
func decodeStatusInformation(d []byte) brotherStatus {
var status brotherStatus
status.errors = append(status.errors, decodeBitfieldErrors(d[8], [8]string{
"no media", "end of media", "cutter jam", "?", "printer in use",
"printer turned off", "high-voltage adapter", "fan motor error"})...)
status.errors = append(status.errors, decodeBitfieldErrors(d[9], [8]string{
"replace media", "expansion buffer full", "communication error",
"communication buffer full", "cover open", "cancel key",
"media cannot be fed", "system error"})...)
return status
}
// -----------------------------------------------------------------------------
func printStatusInformation(d []byte) {
if d[0] != 0x80 || d[1] != 0x20 || d[2] != 0x42 || d[3] != 0x34 {
log.Println("unexpected status fixed bytes")
}
// Model code.
switch b := d[4]; b {
case 0x38:
log.Println("model: QL-800")
case 0x39:
log.Println("model: QL-810W")
case 0x41:
log.Println("model: QL-820NWB")
default:
log.Println("model:", b)
}
// d[6] seems to be 0x00 in a real-world QL-800.
if d[5] != 0x30 || d[6] != 0x30 || d[7] != 0x00 {
log.Println("unexpected status fixed bytes")
}
// Error information 1.
for _, e := range decodeBitfieldErrors(d[8], [8]string{
"no media", "end of media", "cutter jam", "?", "printer in use",
"printer turned off", "high-voltage adapter", "fan motor error"}) {
log.Println("error:", e)
}
// Error information 2.
for _, e := range decodeBitfieldErrors(d[9], [8]string{
"replace media", "expansion buffer full", "communication error",
"communication buffer full", "cover open", "cancel key",
"media cannot be fed", "system error"}) {
log.Println("error:", e)
}
// Media width.
log.Println("media width:", d[10], "mm")
// Media type.
switch b := d[11]; b {
case 0x00:
log.Println("media: no media")
case 0x4a:
log.Println("media: continuous length tape")
case 0x4b:
log.Println("media: die-cut labels")
default:
log.Println("media:", b)
}
// d[14] seems to be 0x14 in a real-world QL-800.
if d[12] != 0x00 || d[13] != 0x00 || d[14] != 0x3f {
log.Println("unexpected status fixed bytes")
}
// Mode.
log.Println("mode:", d[15])
if d[16] != 0x00 {
log.Println("unexpected status fixed bytes")
}
// Media length.
log.Println("media width:", d[17], "mm")
// Status type.
switch b := d[18]; b {
case 0x00:
log.Println("status type: reply to status request")
case 0x01:
log.Println("status type: printing completed")
case 0x02:
log.Println("status type: error occurred")
case 0x04:
log.Println("status type: turned off")
case 0x05:
log.Println("status type: notification")
case 0x06:
log.Println("status type: phase change")
default:
log.Println("status type:", b)
}
// Phase type.
switch b := d[19]; b {
case 0x00:
log.Println("phase state: receiving state")
case 0x01:
log.Println("phase state: printing state")
default:
log.Println("phase state:", b)
}
// Phase number.
log.Println("phase number:", int(d[20])*256+int(d[21]))
// Notification number.
switch b := d[22]; b {
case 0x00:
log.Println("notification number: not available")
case 0x03:
log.Println("notification number: cooling (started)")
case 0x04:
log.Println("notification number: cooling (finished)")
default:
log.Println("notification number:", b)
}
// d[25] seems to be 0x01 in a real-world QL-800.
if d[23] != 0x00 || d[24] != 0x00 || d[25] != 0x00 || d[26] != 0x00 ||
d[27] != 0x00 || d[28] != 0x00 || d[29] != 0x00 || d[30] != 0x00 ||
d[31] != 0x00 {
log.Println("unexpected status fixed bytes")
}
}
func main() {
// Linux usblp module, located in /drivers/usb/class/usblp.c
// (at least that's where the trails go, I don't understand the code)
f, err := os.OpenFile("/dev/usb/lp0", os.O_RDWR, 0)
if err != nil {
log.Fatalln(err)
}
defer f.Close()
// Flush any former responses in the printer's queue.
for {
dummy := make([]byte, 32)
if _, err := f.Read(dummy); err == io.EOF {
break
}
}
// Clear the print buffer.
invalidate := make([]byte, 400)
if _, err := f.Write(invalidate); err != nil {
log.Fatalln(err)
}
// Initialize.
if _, err := f.WriteString("\x1b\x40"); err != nil {
log.Fatalln(err)
}
// Request status information.
if _, err := f.WriteString("\x1b\x69\x53"); err != nil {
log.Fatalln(err)
}
// We need to poll the device.
status := make([]byte, 32)
for {
if n, err := f.Read(status); err == io.EOF {
time.Sleep(10 * time.Millisecond)
} else if err != nil {
log.Fatalln(err)
} else if n < 32 {
log.Fatalln("invalid read")
} else {
break
}
}
printStatusInformation(status)
}
|
