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//
// rhctl
//
// Copyright (C) 2009-2016 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhctl.
//
// rhctl is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// rhctl is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with rhctl. If not, see <http://www.gnu.org/licenses/>.
//
package goserial
import (
"bufio"
"errors"
"log"
"strconv"
"syscall"
"github.com/schleibinger/sio"
)
type Baudrate struct {
value uint32
code uint32
}
func NewBaudrate(value uint32) (b *Baudrate, err error) {
b = &Baudrate{}
err = b.FromUint(value)
return
}
func (b Baudrate) String() string {
return strconv.FormatUint(uint64(b.value), 10)
}
func (b Baudrate) MarshalText() (data []byte, err error) {
data = []byte(b.String())
return
}
func (b Baudrate) MarshalJSON() (data []byte, err error) {
data = []byte(b.String())
return
}
func (b Baudrate) MarshalTOML() (data []byte, err error) {
data = []byte(b.String())
return
}
func (b Baudrate) MarshalYAML() (data []byte, err error) {
data = []byte(b.String())
return
}
func (b *Baudrate) FromUint(value uint32) error {
b.value = value
switch b.value {
case 50:
b.code = syscall.B50
case 75:
b.code = syscall.B75
case 110:
b.code = syscall.B110
case 134:
b.code = syscall.B134
case 150:
b.code = syscall.B150
case 200:
b.code = syscall.B200
case 300:
b.code = syscall.B300
case 600:
b.code = syscall.B600
case 1200:
b.code = syscall.B1200
case 1800:
b.code = syscall.B1800
case 2400:
b.code = syscall.B2400
case 4800:
b.code = syscall.B4800
case 9600:
b.code = syscall.B9600
case 19200:
b.code = syscall.B19200
case 38400:
b.code = syscall.B38400
case 57600:
b.code = syscall.B57600
case 115200:
b.code = syscall.B115200
case 230400:
b.code = syscall.B230400
case 460800:
b.code = syscall.B460800
case 500000:
b.code = syscall.B500000
case 576000:
b.code = syscall.B576000
case 921600:
b.code = syscall.B921600
case 1000000:
b.code = syscall.B1000000
case 1152000:
b.code = syscall.B1152000
case 1500000:
b.code = syscall.B1500000
case 2000000:
b.code = syscall.B2000000
case 2500000:
b.code = syscall.B2500000
case 3000000:
b.code = syscall.B3000000
case 3500000:
b.code = syscall.B3500000
case 4000000:
b.code = syscall.B4000000
default:
return errors.New("invalid baudrate")
}
return nil
}
func (b *Baudrate) fromString(str string) error {
vuint, err := strconv.ParseUint(str, 10, 32)
if err != nil {
return err
}
return b.FromUint(uint32(vuint))
}
func (b *Baudrate) UnmarshalText(data []byte) error {
return b.fromString(string(data))
}
func (b *Baudrate) UnmarshalJSON(data []byte) error {
return b.fromString(string(data))
}
func (b *Baudrate) UnmarshalTOML(data []byte) error {
return b.fromString(string(data))
}
func (b *Baudrate) UnmarshalYAML(data []byte) error {
return b.fromString(string(data))
}
type Port struct {
port *sio.Port
RX <-chan string
TX chan<- string
newline string
}
func serialReader(c chan<- string, port *sio.Port, stop chan<- bool) {
defer func() {
port.Close()
stop <- true
}()
scanner := bufio.NewScanner(port)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
data := scanner.Text()
if len(data) == 0 {
continue
}
c <- data
}
if err := scanner.Err(); err != nil {
log.Printf("device(%s): read error: %s", port.LocalAddr(), err) // TODO: this needs to be configurable
} else {
log.Printf("device(%s): closed", port.LocalAddr()) // TODO: this needs to be configurable
}
}
func serialWriter(c <-chan string, port *sio.Port, newline string, stop chan<- bool) {
defer func() {
port.Close()
stop <- true
}()
for data := range c {
port.Write([]byte(data + newline))
}
}
func (port *Port) Run(stop chan<- bool) (err error) {
tx := make(chan string, 10)
rx := make(chan string, 20)
go serialReader(rx, port.port, stop)
go serialWriter(tx, port.port, port.newline, stop)
port.RX = rx
port.TX = tx
return
}
func Open(device string, rate Baudrate, newline string) (port *Port, err error) {
port = &Port{newline: newline}
if port.port, err = sio.Open(device, rate.code); err != nil {
return
}
return
}
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