package rfid
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import (
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"encoding/binary"
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"encoding/hex"
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"fmt"
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"time"
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"github.com/tarm/serial"
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)
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func NewReader(devName string, baud, readDuration int) *Reader {
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return &Reader{
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DevName: devName,
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Baud: baud,
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ReadDuration: readDuration,
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}
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}
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type Reader struct {
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DevName string
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Baud int
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ReadDuration int
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DevPort *serial.Port
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}
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func (r *Reader) OpenSerial() (err error) {
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config := &serial.Config{
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Name: r.DevName,
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Baud: r.Baud,
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ReadTimeout: 2 * time.Second,
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}
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r.DevPort, err = serial.OpenPort(config)
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return err
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}
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func (r *Reader) CloseSerial() error {
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return r.DevPort.Close()
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}
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// AutoReadStart 开启自动读取, 返回写入的指令长度和错误
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func (r *Reader) StartAutoRead() error {
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cmd := "5A0001010B00100001000B0001021000050000000101005EE2"
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data, _ := hex.DecodeString(cmd)
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_, err := r.DevPort.Write(data)
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if err != nil {
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return nil
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}
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// todo parse response
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r.ReadResponse()
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return err
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}
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// StopAutoRead 停止读取
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func (r *Reader) StopAutoRead() error {
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cmd := "5A000102FF0000885A"
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data, _ := hex.DecodeString(cmd)
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_, err := r.DevPort.Write(data)
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if err != nil {
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return nil
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}
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// todo parse response
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r.ReadResponse()
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return err
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}
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func (r *Reader) ReadResponse() (int, error) {
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buf := make([]byte, 1024) // 根据协议最大数据长度调整缓冲区
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return r.DevPort.Read(buf)
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}
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func (r *Reader) ScanSpecificEPC(target string, minCount int) (bool, error) {
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err := r.StartAutoRead()
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if err != nil {
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return false, err
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}
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defer r.StopAutoRead()
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stop := time.After(time.Duration(r.ReadDuration) * time.Second)
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// 根据协议最大数据长度调整缓冲区
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buf := make([]byte, 1024)
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scanCount := 0
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for {
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select {
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case <-stop:
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fmt.Println("读取已超时")
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return false, nil
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default:
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for i := 0; i < 1024; i++ {
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buf[i] = 0 // 清零或其他处理
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}
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n, err := r.DevPort.Read(buf)
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if err != nil {
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return false, err
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}
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if n == 0 || n < 8 {
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continue // 如果没有读取到数据
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}
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// 检查帧头
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if buf[0] != 0x5A {
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continue // 忽略错误帧
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}
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fmt.Printf("Recive message %x\n", buf[:n]) // 打印协议控制字进行调试
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// 校验CRC
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//fmt.Printf("Crc %x\n",buf[n-2 : n])
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receivedCrc := binary.BigEndian.Uint16(buf[n-2 : n])
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computedCrc := CRC16XMODEM(buf[1 : n-2])
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if receivedCrc != (computedCrc & 0xFFFF) {
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fmt.Println("CRC check failed")
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continue
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}
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// 解析协议控制字 (仅在需要时使用)
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//fmt.Printf("Control Word: %x\n", buf[1:5]) // 打印协议控制字进行调试
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controlWord := binary.BigEndian.Uint32(buf[1:5])
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if controlWord != ControlWordEPCReadResponse6C {
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fmt.Printf("Control Word: %d, rec word %d\n", ControlWordEPCReadResponse6C, controlWord)
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continue
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}
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// 解析EPC数据长度
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epcLength := binary.BigEndian.Uint16(buf[7:9])
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//fmt.Printf("EPC length %d, EPC %x \n", epcLength, buf[9:9+epcLength])
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// 回调传送epc数据
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//callBack(buf[9 : 9+epcLength])
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epcData := fmt.Sprintf("%x", buf[9:9+epcLength])
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if epcData == target {
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scanCount++
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if scanCount > minCount {
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return true, nil
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}
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}
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fmt.Printf("read epc %s, target epc: %s", epcData, target)
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}
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}
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}
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