59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
package utils
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import (
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"io"
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"log"
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"time"
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"github.com/tarm/serial"
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)
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var (
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device string
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baudrate int
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bytesize byte
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stopbits byte
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port *serial.Port
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portOpened = false
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)
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const readDuration = 500 * time.Millisecond
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// OpenPort open serial port
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func OpenPort(device string, baudrate int, bytesize byte, stopbits byte) error {
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log.Println("opening port device:", device, ", baudrate=", baudrate, ", bytesize=", bytesize, "stopbits=", stopbits)
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config := &serial.Config{Name: device,
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Baud: baudrate,
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Size: bytesize,
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StopBits: serial.StopBits(stopbits),
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ReadTimeout: readDuration}
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var err error
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port, err = serial.OpenPort(config)
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if err != nil {
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log.Fatalln("error in open serial port ", err)
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return err
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}
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log.Println("opened port ", port)
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portOpened = true
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return nil
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}
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//ReadPort read byte array from port
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func ReadPort() ([]byte, int) {
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buffer := make([]byte, 256)
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if !ServerRunning {
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return buffer, 0
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}
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count, err := port.Read(buffer)
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if err != nil && err != io.EOF {
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log.Println("error in read port ", err)
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//TODO: 3 time fail try to
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}
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return buffer, count
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}
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//IsPortOpen check serial port status
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func IsPortOpen() bool {
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return portOpened
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}
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