On 24.02.2012 09:38, salorob wrote:
Hi Robert,
I have to be honest, i don't have a clue where to start with this. At this
point my lack of deeper knowledge of C and linux made me decide to try mono
on an embedded device.
I've attached a sample of the recipe from my former post.
The code is untested because I don't have such a device.
Robert
using System;
using System.IO.Ports;
using System.Reflection;
using System.Runtime.InteropServices;
public static class SerialPortExtensions
{
public static int GetHandle (this SerialPort self)
{
var streamField = typeof (SerialPort).GetField ("stream", BindingFlags.Instance | BindingFlags.NonPublic);
object stream = streamField.GetValue (self);
var fdField = stream.GetType ().GetField ("fd", BindingFlags.Instance | BindingFlags.NonPublic);
object fd = fdField.GetValue (stream);
return (int) fd;
}
public static int EnableRS485(this SerialPort self)
{
int handle = self.GetHandle ();
var data = new SerialRS485Ioctl ();
data.flags = SER_RS485_ENABLED;
return ioctl (handle, TIOCSRS485, ref data);
}
const uint SER_RS485_ENABLED = 1;
const int TIOCSRS485 = 0x542F;
[DllImport("libc")]
static extern int ioctl(int fd, int request, ref SerialRS485Ioctl data);
}
public struct SerialRS485Ioctl
{
public uint flags;
public uint delay_rts_before_send;
public uint delay_rts_after_send;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)]
public uint[] padding;
}
class Test
{
static void Main ()
{
var port = new SerialPort ("/dev/ttyS1");
port.Open();
Console.WriteLine (port.EnableRS485 ());
}
}
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