65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
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/*
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Package serial provides a cross-platform serial reader and writer.
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*/
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package serial
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import (
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"errors"
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"io"
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"time"
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)
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var (
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// ErrTimeout is occurred when timing out.
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ErrTimeout = errors.New("serial: timeout")
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)
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// Config is common configuration for serial port.
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type Config struct {
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// Device path (/dev/ttyS0)
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Address string
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// Baud rate (default 19200)
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BaudRate int
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// Data bits: 5, 6, 7 or 8 (default 8)
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DataBits int
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// Stop bits: 1 or 2 (default 1)
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StopBits int
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// Parity: N - None, E - Even, O - Odd (default E)
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// (The use of no parity requires 2 stop bits.)
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Parity string
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// Read (Write) timeout.
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Timeout time.Duration
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// Configuration related to RS485
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RS485 RS485Config
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}
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// platform independent RS485 config. Thie structure is ignored unless Enable is true.
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type RS485Config struct {
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// Enable RS485 support
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Enabled bool
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// Delay RTS prior to send
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DelayRtsBeforeSend time.Duration
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// Delay RTS after send
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DelayRtsAfterSend time.Duration
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// Set RTS high during send
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RtsHighDuringSend bool
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// Set RTS high after send
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RtsHighAfterSend bool
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// Rx during Tx
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RxDuringTx bool
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}
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// Port is the interface for controlling serial port.
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type Port interface {
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io.ReadWriteCloser
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// Connect connects to the serial port.
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Open(*Config) error
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}
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// Open opens a serial port.
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func Open(c *Config) (p Port, err error) {
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p = New()
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err = p.Open(c)
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return
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}
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