334 lines
8.7 KiB
Go
334 lines
8.7 KiB
Go
// catprinter_ble.go
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// A Go reimplementation of the CatPrinterBLE utility
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// using Go's BLE stack and Image processing libraries
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package main
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import (
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"context"
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"fmt"
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"image/color"
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"github.com/disintegration/imaging"
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"log"
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"os"
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"os/signal"
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"time"
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ble "github.com/go-ble/ble"
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"github.com/go-ble/ble/linux"
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)
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var (
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mainServiceUUID = ble.MustParse("ae30")
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printCharacteristic = ble.MustParse("ae01")
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notifyCharacteristic = ble.MustParse("ae02")
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dataCharacteristic = ble.MustParse("ae03")
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targetPrinterName = "MXW01"
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scanTimeout = 10 * time.Second
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printCommandHeader = []byte{0x22, 0x21}
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printCommandFooter = byte(0xFF)
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)
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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func reverseBitsInByte(b byte) byte {
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b = (b&0xF0)>>4 | (b&0x0F)<<4
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b = (b&0xCC)>>2 | (b&0x33)<<2
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b = (b&0xAA)>>1 | (b&0x55)<<1
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return b
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}
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func dumpCharacteristics(client ble.Client, svc *ble.Service) {
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chars, err := client.DiscoverCharacteristics(nil, svc)
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if err != nil {
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log.Fatalf("Error discovering characteristics: %v", err)
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}
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log.Printf("Discovered %d characteristics:", len(chars))
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for _, c := range chars {
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props := ""
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if c.Property&ble.CharRead != 0 {
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props += "Read "
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}
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if c.Property&ble.CharWrite != 0 {
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props += "Write "
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}
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if c.Property&ble.CharWriteNR != 0 {
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props += "WriteWithoutResponse "
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}
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if c.Property&ble.CharNotify != 0 {
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props += "Notify "
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}
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if c.Property&ble.CharIndicate != 0 {
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props += "Indicate "
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}
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log.Printf(" UUID: %s, Properties: %s", c.UUID, props)
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}
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}
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func parseNotification(data []byte) {
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if len(data) < 10 || data[0] != 0x22 || data[1] != 0x21 {
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fmt.Println("Invalid notification header")
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return
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}
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cmd := data[2]
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switch cmd {
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case 0xA1: // GetStatus
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battery := data[9]
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temp := data[10]
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statusOk := data[12] == 0
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statusCode := data[6]
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errCode := data[13]
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statusMsg := "Unknown"
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if statusOk {
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switch statusCode {
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case 0x0:
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statusMsg = "Standby"
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case 0x1:
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statusMsg = "Printing"
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case 0x2:
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statusMsg = "Feeding paper"
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case 0x3:
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statusMsg = "Ejecting paper"
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}
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} else {
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switch errCode {
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case 0x1, 0x9:
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statusMsg = "No paper"
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case 0x4:
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statusMsg = "Overheated"
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case 0x8:
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statusMsg = "Low battery"
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}
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}
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fmt.Printf("Status: %v (%s), Battery: %d, Temp: %d\n", statusOk, statusMsg, battery, temp)
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default:
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fmt.Printf("Unhandled command: 0x%02X\n", cmd)
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}
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}
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const (
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linePixels = 384
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bytesPerLine = linePixels / 8
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)
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// Convert image to 1bpp, dithered, and packed bytes
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func loadImageMono(path string) ([]byte, int, error) {
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img, err := imaging.Open(path, imaging.AutoOrientation(true))
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if err != nil {
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return nil, 0, fmt.Errorf("image open error: %v", err)
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}
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ratio := float64(img.Bounds().Dx()) / float64(img.Bounds().Dy())
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height := int(float64(linePixels) / ratio)
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img = imaging.Resize(img, linePixels, height, imaging.Lanczos)
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img = imaging.Grayscale(img)
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img = imaging.AdjustContrast(img, 10)
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pixels := make([]byte, (linePixels*height)/8)
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for y := 0; y < height; y++ {
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for x := 0; x < linePixels; x++ {
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gray := color.GrayModel.Convert(img.At(x, y)).(color.Gray)
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if gray.Y < 127 {
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idx := (y*linePixels + x) / 8
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bit := 7 - (x % 8)
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pixels[idx] |= 1 << bit
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}
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}
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}
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return pixels, height, nil
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}
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func sendImageToPrinter(client ble.Client, dataChr, printChr *ble.Characteristic, path string) error {
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pixels, height, err := loadImageMono(path)
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if err != nil {
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return err
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}
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fmt.Printf("Sending image: %dx%d lines\n", linePixels, height)
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cmd := buildCommand(0xA2, []byte{80}) // intensity 80
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err = client.WriteCharacteristic(printChr, cmd, true)
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if err != nil {
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return fmt.Errorf("intensity set failed: %v", err)
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}
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lines := height
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param := []byte{
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byte(lines & 0xFF), byte(lines >> 8),
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0x30, // reserved
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0x00, // 1bpp mode
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}
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cmd = buildCommand(0xA9, param)
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err = client.WriteCharacteristic(printChr, cmd, true)
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if err != nil {
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return fmt.Errorf("print command failed: %v", err)
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}
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for y := 0; y < lines; y++ {
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slice := pixels[y*bytesPerLine : (y+1)*bytesPerLine]
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reversed := make([]byte, bytesPerLine)
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for i := 0; i < bytesPerLine; i++ {
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reversed[i] = reverseBitsInByte(slice[i])
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}
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err := client.WriteCharacteristic(dataChr, reversed, true)
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if err != nil {
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return fmt.Errorf("line %d write failed: %v", y, err)
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}
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time.Sleep(6 * time.Millisecond)
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}
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cmd = buildCommand(0xAD, []byte{0x00}) // flush
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err = client.WriteCharacteristic(printChr, cmd, true)
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if err != nil {
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return fmt.Errorf("flush failed: %v", err)
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}
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return nil
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}
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func main() {
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if len(os.Args) < 2 {
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fmt.Println("Usage: catprinter-ble <image_path>")
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return
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}
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imagePath := os.Args[1]
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ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
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defer stop()
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d, err := linux.NewDevice()
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if err != nil {
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log.Fatalf("Failed to open BLE device: %v", err)
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}
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ble.SetDefaultDevice(d)
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log.Println("Scanning for printer...")
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var adv ble.Advertisement
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ctxScan, cancel := context.WithTimeout(ctx, 10*time.Second)
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err = ble.Scan(ctxScan, false, func(a ble.Advertisement) {
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if a.LocalName() == targetPrinterName {
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adv = a
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cancel()
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}
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}, nil)
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if err != nil && err != context.Canceled {
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log.Fatalf("Scan error: %v", err)
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}
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if adv == nil {
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log.Println("Printer not found.")
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return
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}
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log.Println("Connecting...")
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client, err := ble.Dial(ctx, adv.Addr())
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if err != nil {
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log.Fatalf("Connect failed: %v", err)
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}
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defer client.CancelConnection()
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mtu, err := client.ExchangeMTU(100)
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if err != nil {
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log.Printf("MTU negotiation failed, continuing with default MTU. Reason: %v", err)
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} else {
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log.Printf("Negotiated ATT MTU: %d", mtu)
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}
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services, err := client.DiscoverServices([]ble.UUID{mainServiceUUID})
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if err != nil || len(services) == 0 {
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log.Fatalf("Service discovery failed: %v", err)
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}
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svc := services[0]
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chars, err := client.DiscoverCharacteristics(nil, svc)
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if err != nil {
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log.Fatalf("Char discovery failed: %v", err)
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}
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var printChr, dataChr *ble.Characteristic
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for _, c := range chars {
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switch c.UUID.String() {
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case printCharacteristic.String():
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printChr = c
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case dataCharacteristic.String():
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dataChr = c
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}
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}
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if printChr == nil || dataChr == nil {
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log.Fatalf("Required characteristics missing")
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}
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err = sendImageToPrinter(client, dataChr, printChr, imagePath)
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if err != nil {
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log.Fatalf("Failed to print image: %v", err)
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}
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log.Println("Done!")
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}
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func buildCommand(cmdId byte, payload []byte) []byte {
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cmd := append([]byte{}, printCommandHeader...)
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cmd = append(cmd, cmdId)
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cmd = append(cmd, 0x00) // reserved
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cmd = append(cmd, byte(len(payload)&0xFF), byte(len(payload)>>8))
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cmd = append(cmd, payload...)
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cmd = append(cmd, calculateCRC8(payload))
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cmd = append(cmd, printCommandFooter)
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return cmd
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}
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func calculateCRC8(data []byte) byte {
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table := [256]byte{
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0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
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0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
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0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
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0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
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0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
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0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
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0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
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0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
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0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
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0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
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0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
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0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
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0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
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0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
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0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
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0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
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0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
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0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
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0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
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0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
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0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
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0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
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0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
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0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
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0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
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0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
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0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
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0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
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0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
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0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
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0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
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0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3}
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crc := byte(0)
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for _, b := range data {
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crc = table[crc^b]
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}
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return crc
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}
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