138 lines
2.9 KiB
Go
138 lines
2.9 KiB
Go
package card_reader
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import (
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"context"
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"fmt"
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"github.com/munnik/modbus"
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"go.uber.org/zap"
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"io"
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"math"
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"strings"
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"time"
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)
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type Reader interface {
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io.Closer
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SetUnitID(uint8)
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Init() error
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// OnCardInfo 会在卡号信息发生变化时调用回调函数，直到上下文被取消，或者 Reader 被关闭。需要在 goroutine 中调用。
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OnCardInfo(context.Context, func(CardInfo))
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}
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type CardInfo struct {
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Type uint16
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ID string
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}
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type reader struct {
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c *modbus.Client
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}
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func (r *reader) Init() error {
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// 配置读卡间隔时间为 50 毫秒
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err := r.c.WriteRegister(8, 0x0511)
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if err != nil {
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return err
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}
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// 由低到高输出 500 毫秒
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err = r.c.WriteRegister(9, 0xF20A)
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if err != nil {
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return err
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}
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// 读取后自动清空，高字节：00 不清空 01 清空
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err = r.c.WriteRegister(10, 0x0103)
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if err != nil {
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return err
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}
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// 自动读卡号，高字节高4位：0 读一次 1 连续读
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err = r.c.WriteRegister(11, 0x0301)
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if err != nil {
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return err
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}
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return nil
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}
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func (r *reader) OnCardInfo(ctx context.Context, f func(info CardInfo)) {
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for {
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select {
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case <-ctx.Done():
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return
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case <-time.After(100 * time.Millisecond):
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{
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// 读取状态寄存器确认是否信息已经准备好
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status, err := r.c.ReadRegister(29, modbus.HoldingRegister)
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if err != nil {
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zap.S().Errorln("ReadRegister 40030 error:", err)
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break
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} else if status == 0x0000 {
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break
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}
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// 读取卡号长度
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cardLength, err := r.c.ReadRegister(30, modbus.HoldingRegister)
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if err != nil {
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zap.S().Errorln("ReadRegister 40031 error:", err)
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break
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}
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dataLength := cardLength >> 8
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// 读取卡类型
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cardType, err := r.c.ReadRegister(31, modbus.HoldingRegister)
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if err != nil {
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zap.S().Errorln("ReadRegister 40032 error:", err)
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break
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}
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// 读取卡号数据
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cardData, err := r.c.ReadRegisters(32, uint16(math.Round(float64(dataLength)/2)), modbus.HoldingRegister)
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if err != nil {
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zap.S().Errorln("ReadRegister 40033~ error:", err)
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break
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}
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s := make([]string, dataLength)
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for i := 0; i < int(dataLength); i++ {
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if i%2 == 0 {
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s[i] = fmt.Sprintf("%02X", cardData[i/2]>>8)
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} else {
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s[i] = fmt.Sprintf("%02X", cardData[i/2]&0xFF)
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}
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}
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f(CardInfo{
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Type: cardType,
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ID: strings.Join(s, ""),
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})
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}
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}
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}
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}
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func (r *reader) SetUnitID(unitID uint8) {
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_ = r.c.SetUnitID(unitID)
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}
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func (r *reader) Close() error {
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return r.c.Close()
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}
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// NewReader 创建一个新的读卡器
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func NewReader(URL string) (Reader, error) {
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// 配置串口客户端
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c, _ := modbus.NewClient(&modbus.Configuration{
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URL: URL,
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Speed: 9600,
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DataBits: 8,
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Timeout: 2 * time.Second,
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Logger: zap.NewStdLog(zap.L()),
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})
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// 打开串口连接
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err := c.Open()
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if err != nil {
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return nil, err
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}
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return &reader{c}, nil
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}
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