283 lines
7.3 KiB
Go
283 lines
7.3 KiB
Go
package mxw01
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import (
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"context"
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"errors"
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"fmt"
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"time"
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ble "github.com/go-ble/ble"
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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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DatCharacteristic = 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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type PrintMode byte
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const (
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Mode1bpp PrintMode = 0x00
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Mode4bpp PrintMode = 0x02
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)
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const (
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LinePixels = 384
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MinLines = 86 // firmware refuses to print anything shorter
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DefaultSleep = 6 * time.Millisecond
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)
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type Status struct {
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OK bool `json:"ok"`
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State string `json:"state"`
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BatteryPct int `json:"battery"`
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TempC int `json:"temp"`
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}
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type Version struct {
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Version string `json:"version"`
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PrintType string `json:"printType"`
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}
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func FindPrinter(ctx context.Context, address string) (ble.Advertisement, error) {
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var addr ble.Addr
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var adv ble.Advertisement
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if address != "" {
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addr = ble.NewAddr(address)
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}
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ctxScan, cancel := context.WithTimeout(ctx, ScanTimeout)
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defer cancel()
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err := ble.Scan(ctxScan, false, func(a ble.Advertisement) {
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if address != "" {
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if a.Addr().String() == addr.String() {
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adv = a
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cancel()
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}
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return
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}
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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 && !errors.Is(err, context.Canceled) {
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return nil, fmt.Errorf("scan error: %w", err)
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}
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if adv == nil {
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return nil, fmt.Errorf("printer not found")
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}
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return adv, nil
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}
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func DiscoverChars(client ble.Client) (printChr, notifyChr, dataChr *ble.Characteristic, err error) {
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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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return nil, nil, nil, fmt.Errorf("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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return nil, nil, nil, fmt.Errorf("characteristic discovery failed: %v", err)
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}
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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 NotifyCharacteristic.String():
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notifyChr = c
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case DatCharacteristic.String():
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dataChr = c
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}
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}
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return printChr, notifyChr, dataChr, nil
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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 SendSimpleCommand(client ble.Client, printChr *ble.Characteristic, cmdId byte) error {
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cmd := BuildCommand(cmdId, []byte{0x00})
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return client.WriteCharacteristic(printChr, cmd, true)
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}
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func SendLineCommand(client ble.Client, printChr *ble.Characteristic, cmdId byte, lines uint) error {
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param := []byte{byte(lines & 0xFF), byte(lines >> 8)}
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cmd := BuildCommand(cmdId, param)
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return client.WriteCharacteristic(printChr, cmd, true)
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}
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func ParseNotification(data []byte) (cmd byte, payloadLen int, err error) {
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if len(data) < 6 {
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return 0, 0, fmt.Errorf("malformed notification (too short)")
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}
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if data[0] != 0x22 || data[1] != 0x21 {
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return 0, 0, fmt.Errorf("invalid notification header")
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}
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cmd = data[2]
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payloadLen = int(data[4]) | int(data[5])<<8
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return cmd, payloadLen, nil
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}
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func DecodeStatusNotification(data []byte) (*Status, error) {
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_, _, err := ParseNotification(data)
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if err != nil {
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return nil, err
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}
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if len(data) < 14 {
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return nil, fmt.Errorf("malformed status notification")
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}
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battery := int(data[9])
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temp := int(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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return &Status{OK: statusOk, State: statusMsg, BatteryPct: battery, TempC: temp}, nil
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}
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func DecodeBatteryNotification(data []byte) (int, error) {
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_, _, err := ParseNotification(data)
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if err != nil {
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return 0, err
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}
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if len(data) < 7 {
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return 0, fmt.Errorf("malformed battery notification")
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}
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return int(data[6]), nil
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}
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func DecodePrintTypeNotification(data []byte) (string, error) {
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_, _, err := ParseNotification(data)
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if err != nil {
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return "", err
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}
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if len(data) < 7 {
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return "", fmt.Errorf("malformed printtype notification")
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}
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switch data[6] {
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case 0x01:
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return "High pressure", nil
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case 0xFF:
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return "Unknown", nil
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default:
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return "Low pressure", nil
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}
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}
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func DecodeVersionNotification(data []byte) (*Version, error) {
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_, dataLen, err := ParseNotification(data)
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if err != nil {
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return nil, err
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}
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if len(data) < 15 {
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return nil, fmt.Errorf("malformed version notification (too short)")
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}
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if len(data) < 14+dataLen {
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return nil, fmt.Errorf("malformed version notification")
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}
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ver := string(data[6 : 6+dataLen])
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pt := "Unknown"
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switch data[14] {
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case 0x32:
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pt = "High pressure"
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case 0x31:
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pt = "Low pressure"
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}
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return &Version{Version: ver, PrintType: pt}, nil
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}
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func DecodeQueryCountNotification(data []byte) ([]byte, error) {
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_, _, err := ParseNotification(data)
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if err != nil {
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return nil, err
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}
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if len(data) < 12 {
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return nil, fmt.Errorf("malformed querycount notification")
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}
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out := make([]byte, 6)
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copy(out, data[6:12])
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return out, nil
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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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}
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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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