I am new to netduino so I have a simple question (or, it should be simple). What I want to do is to send an integer (string) via rs232 from my winform app to my netduino plus 2, and then, my netduino should read that integer and blink an onboard led that many times.
I have read online tutorial on that topic and found some examples that should provide communication between my PC and Netduino.
Yes, I did got an echo from it. I am getting an echo even if I disconnect my netduino and hide it in my pocket :). So much for my understanding of that gadget.
How can I send an info to my Netduino via rs232 cabel that he can read, understand and act accordingly?
There is a code straight from the the web:
For NETDUINO:
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.Netduino;
using System.IO.Ports;
namespace NetduinoApplication1
{
public class Program
{
static SerialPort serial;
public static void Main()
{
// initialize the serial port for COM1 (using D0 & D1)
serial = new SerialPort(SerialPorts.COM1, 9600, Parity.None, 8, StopBits.One);
// open the serial-port, so we can send & receive data
serial.Open();
// add an event-handler for handling incoming data
serial.DataReceived += new SerialDataReceivedEventHandler(serial_DataReceived);
OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);
for (int i = 0; i < 3; i++)
{
led.Write(true); // turn on the LED
Thread.Sleep(250); // sleep for 250ms
led.Write(false); // turn off the LED
Thread.Sleep(250); // sleep for 250ms
}
// wait forever...
Thread.Sleep(Timeout.Infinite);
}
static void serial_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
// create a single byte array
byte[] bytes = new byte[1];
// as long as there is data waiting to be read
while (serial.BytesToRead > 0)
{
// read a single byte
serial.Read(bytes, 0, bytes.Length);
// send the same byte back
serial.Write(bytes, 0, bytes.Length);
OutputPort led1 = new OutputPort(Pins.ONBOARD_LED, false);
led1.Write(true); // turn on the LED
Thread.Sleep(250); // sleep for 250ms
led1.Write(false); // turn off the LED
Thread.Sleep(250); // sleep for 250ms
}
}
}
}
And the code for my console:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
namespace ConsoleRSS
{
class Program
{
static SerialPort serial;
static void Main(string[] args)
{
// provide some usage information
System.Console.WriteLine("enter some text and hit ENTER.");
System.Console.WriteLine("enter 'x' and hit ENTER to exit.");
System.Console.WriteLine();
// initialize the serial port for COM3 (could be other port, depends on system)
serial = new SerialPort("COM3", 9600, Parity.None, 8, StopBits.One);
// open the serial-port, so we can send & receive data
serial.Open();
// add an event-handler for handling incoming data
serial.DataReceived += new SerialDataReceivedEventHandler(serial_DataReceived);
// this will hold each line entered
string line = string.Empty;
// as long as an x is not entered
while (line.ToLowerInvariant() != "x")
{
// read a single line from the console
line = System.Console.ReadLine();
// convert the line to bytes
byte[] utf8Bytes = System.Text.Encoding.UTF8.GetBytes(line);
// send the bytes over the serial-port
serial.Write(utf8Bytes, 0, utf8Bytes.Length);
}
}
static void serial_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
// wait a little for the buffer to fill
System.Threading.Thread.Sleep(100);
// create an array for the incoming bytes
byte[] bytes = new byte[serial.BytesToRead];
// read the bytes
serial.Read(bytes, 0, bytes.Length);
// convert the bytes into a string
string line = System.Text.Encoding.UTF8.GetString(bytes);
// write the received bytes, as a string, to the console
System.Console.WriteLine("echo: " + line);
System.Console.WriteLine();
}
}
}
