Added linux serial support for corsscompiling

serial_linux.go

@@ -0,0 +1,86 @@
+// +build linux,!cgo
+
+package serial
+
+import (
+	"os"
+	"syscall"
+	"io"
+	"unsafe"
+)
+
+func openPort(name string, baud int) (rwc io.ReadWriteCloser, err error) {
+
+    var bauds = map[int]uint32{
+        50:      syscall.B50,
+        75:      syscall.B75,
+        110:     syscall.B110,
+        134:     syscall.B134,
+        150:     syscall.B150,
+        200:     syscall.B200,
+        300:     syscall.B300,
+        600:     syscall.B600,
+        1200:    syscall.B1200,
+        1800:    syscall.B1800,
+        2400:    syscall.B2400,
+        4800:    syscall.B4800,
+        9600:    syscall.B9600,
+        19200:   syscall.B19200,
+        38400:   syscall.B38400,
+        57600:   syscall.B57600,
+        115200:  syscall.B115200,
+        230400:  syscall.B230400,
+        460800:  syscall.B460800,
+        500000:  syscall.B500000,
+        576000:  syscall.B576000,
+        921600:  syscall.B921600,
+        1000000: syscall.B1000000,
+        1152000: syscall.B1152000,
+        1500000: syscall.B1500000,
+        2000000: syscall.B2000000,
+        2500000: syscall.B2500000,
+        3000000: syscall.B3000000,
+        3500000: syscall.B3500000,
+        4000000: syscall.B4000000,
+    }
+
+    rate := bauds[baud]
+
+	f, err := os.OpenFile(name, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
+	if err != nil {
+		return nil, err
+	}
+
+	defer func(){
+		if err != nil && f != nil {
+			f.Close()
+		}
+	}()
+
+	fd := f.Fd()
+    t := syscall.Termios{
+            Iflag:  syscall.IGNPAR,
+            Cflag:  syscall.CS8 | syscall.CREAD | syscall.CLOCAL | rate,
+            Cc:     [32]uint8{syscall.VMIN: 1},
+            Ispeed: rate,
+            Ospeed: rate,
+    }
+
+    if _, _, errno := syscall.Syscall6(
+            syscall.SYS_IOCTL,
+            uintptr(fd),
+            uintptr(syscall.TCSETS),
+            uintptr(unsafe.Pointer(&t)),
+            0,
+            0,
+            0,
+    ); errno != 0 {
+            return nil, errno
+    }
+
+    if err = syscall.SetNonblock(int(fd), false); err != nil {
+        return
+    }
+
+	return f, nil
+}

serial_posix.go

@@ -1,4 +1,4 @@
-// +build !windows
+// +build !windows,cgo
 
 package serial