113 lines
2.1 KiB
Go
113 lines
2.1 KiB
Go
package at
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import (
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"fmt"
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"log"
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"time"
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"go.bug.st/serial"
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)
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// Some constants
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const (
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ReadTimeout = time.Second
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InputBufSize = 128
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)
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type atPort struct {
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logger *log.Logger
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baudrate int
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portName string
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port serial.Port
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inputBuf []byte
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}
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type Port interface {
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GetName() string
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GetSerialPort() serial.Port // For extra need
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Connect() error
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Disconnect() error
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IsConnected() bool
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Send(cmd string) (Resp, error)
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}
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func New(logger *log.Logger, portName string, baudrate int) Port {
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return &atPort{
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logger: logger,
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portName: portName,
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baudrate: baudrate,
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inputBuf: make([]byte, InputBufSize),
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}
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}
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func (p *atPort) GetName() string {
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return p.portName
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}
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func (p *atPort) GetSerialPort() serial.Port {
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return p.port
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}
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func (p *atPort) Connect() error {
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p.logger.Println("Connecting to", p.portName, "...")
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s, err := serial.Open(p.portName, &serial.Mode{BaudRate: p.baudrate})
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if err != nil {
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return fmt.Errorf("open port: %w", err)
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}
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// s.Close() There is no open f
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// s.Open()
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p.port = s
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p.port.SetReadTimeout(ReadTimeout)
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p.port.ResetInputBuffer()
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p.port.ResetOutputBuffer()
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return nil
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}
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func (p *atPort) Disconnect() error {
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defer func() {
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p.port = nil
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}()
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if err := p.port.Close(); err != nil {
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return fmt.Errorf("close port: %w", err)
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}
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return nil
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}
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func (p *atPort) IsConnected() bool {
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return p.port != nil
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}
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// Low level write/read function
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func (p *atPort) makeReq(msg string) (string, error) {
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// Write
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p.port.ResetInputBuffer()
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if _, err := p.port.Write([]byte(msg)); err != nil {
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return "", fmt.Errorf("serial port write: %w", err)
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}
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// Read
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readLen, err := p.port.Read(p.inputBuf)
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p.logger.Println(msg, "RAWREAD:", string(p.inputBuf[:readLen]))
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if err != nil {
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return "", fmt.Errorf("port read: %w", err)
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}
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return string(p.inputBuf[:readLen]), nil
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}
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func (p *atPort) Send(cmd string) (Resp, error) {
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cmd += "\r\n"
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rawResp, err := p.makeReq(cmd)
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if err != nil {
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return RespNil, fmt.Errorf("make request: %w", err)
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}
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if len(rawResp) <= 4 {
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return RespNil, fmt.Errorf("read too small msg: %d byte", len(rawResp))
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}
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resp := rawResp[2 : len(rawResp)-2] // Cut \r\n
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return Resp(resp), nil
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}
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