// handle the serial port communication. When data comes in through
// the serial port write it to the channel for the socket to see. When
// data comes in from the socket over the channel translate the message
// and write to serial port
func handlePort(p *serial.Port, ch chan []byte) {
readCh := make(chan []byte)
go serialRead(p, readCh)
for {
select {
case s := <-ch:
{
// map gui -> micro
trans := mapGui.ItemTranslate(string(s))
_, err := p.Write([]byte(trans))
if err != nil {
fmt.Println(err)
}
}
case r := <-readCh:
{
ch <- r
}
case <-time.After(timeout):
continue
}
}
}
// serial read, we run this in a goroutine so we can block on read
// on data read send through the channel
func serialRead(p *serial.Port, ch chan []byte) {
buf := make([]byte, 256)
for {
n, err := p.Read(buf)
if err != nil && err != io.EOF {
log.Fatal(err)
}
if n > 0 {
ch <- buf[:n]
}
}
}