From 2db0caf47dbc642428dc260832090af83f6a8e1c Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Thu, 24 Mar 2016 01:49:12 +0100
Subject: added serial port handling


diff --git a/src/rhctl/main.go b/src/rhctl/main.go
index 430c287..e86eeb0 100644
--- a/src/rhctl/main.go
+++ b/src/rhctl/main.go
@@ -74,12 +74,19 @@ func main() {
 
 	var wg sync.WaitGroup
 
+	port, err := SerialOpenAndHandle("/dev/ttyUSB0", B38400)
+	if err != nil {
+		rhl.Println("Error opening serial:", err)
+		return
+	}
+	port.tx <- "hello world\n"
+
 	if webAddr.Get().(string) != "" {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
 			rhl.Println("starting web-api:", webAddr.Get().(string))
-			//StartControlWeb(webAddr.Get().(string))
+			//StartWeb(webAddr.Get().(string))
 			rhl.Println("web-api finished")
 		}()
 	}
diff --git a/src/rhctl/serialport.go b/src/rhctl/serialport.go
new file mode 100644
index 0000000..d805bdc
--- /dev/null
+++ b/src/rhctl/serialport.go
@@ -0,0 +1,87 @@
+//
+//  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 main
+
+import (
+	"bufio"
+	"syscall"
+
+	"github.com/schleibinger/sio"
+)
+
+type Baudrate uint32
+
+const (
+	B1200   Baudrate = syscall.B1200
+	B2400            = syscall.B2400
+	B4800            = syscall.B4800
+	B9600            = syscall.B9600
+	B19200           = syscall.B19200
+	B38400           = syscall.B38400
+	B57600           = syscall.B57600
+	B115200          = syscall.B115200
+)
+
+type SerialLine string
+
+type SerialPort struct {
+	port *sio.Port
+	rx   <-chan SerialLine
+	tx   chan<- SerialLine
+}
+
+func SerialRead(c chan<- SerialLine, port *sio.Port) {
+	scanner := bufio.NewScanner(port)
+	scanner.Split(bufio.ScanLines)
+	for scanner.Scan() {
+		if err := scanner.Err(); err != nil {
+			panic(err.Error())
+		}
+		data := scanner.Text()
+		if len(data) == 0 {
+			continue
+		}
+		c <- SerialLine(data)
+	}
+}
+
+func SerialWrite(c <-chan SerialLine, port *sio.Port) {
+	for data := range c {
+		port.Write([]byte(data))
+	}
+	port.Close()
+}
+
+func SerialOpenAndHandle(device string, speed Baudrate) (port *SerialPort, err error) {
+	port = &SerialPort{}
+	if port.port, err = sio.Open(device, uint32(speed)); err != nil {
+		return
+	}
+	tx := make(chan SerialLine, 1)
+	rx := make(chan SerialLine, 20)
+	go SerialRead(rx, port.port)
+	go SerialWrite(tx, port.port)
+
+	port.rx = rx
+	port.tx = tx
+	return
+}
-- 
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