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-rw-r--r--brother-info/main.go207
1 files changed, 207 insertions, 0 deletions
diff --git a/brother-info/main.go b/brother-info/main.go
new file mode 100644
index 0000000..b65b1dc
--- /dev/null
+++ b/brother-info/main.go
@@ -0,0 +1,207 @@
+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)
+}