LPC81x ISP c# code help

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LPC81x ISP c# code help

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Contributor I

Dear all,

I use for some years now the LPC811 and LPC812 microcontroller. Programming is done with Flash Magic and a FTDI C232HD USB 2.0 Hi-Speed to UART Cable where RTS is connected to PIO0_12 (ISP entry) and DTR to PIO0_5 (Reset). This works without any issue.

Now I want to write small c# windows programs for some ISP tasks, which shall be used during production and test.
My first try is a command line tool that shall read the UID of the microcontroller.

using System;
using System.IO.Ports;
using System.Threading;

public class PortChat
{
    static bool _continue;
    static SerialPort _serialPort;


    public static void Main()
    {
        _serialPort = new SerialPort("COM4", 115200, Parity.None, 8, StopBits.One);

        // Set the read/write timeouts
        _serialPort.ReadTimeout = 1000;
        _serialPort.WriteTimeout = 100;
        
        _serialPort.Open();
        _continue = true;
        
        //ISP-Entry to 0V
        _serialPort.RtsEnable = true;

        Thread.Sleep(100);
        //Reset-Pin to 0V
        _serialPort.DtrEnable = true;

        Thread.Sleep(100);
        //Reset-Pin to 3.3V
        _serialPort.DtrEnable = false;

        Thread.Sleep(100);

        Console.WriteLine("UID:");
        _serialPort.WriteLine("N");

        while (_continue)
        {
            try
            {
                string inputmessage = _serialPort.ReadLine();
                Console.WriteLine(inputmessage);
            }
            catch (TimeoutException)
            {
                _continue = false;
                Console.WriteLine("Nothing received");
                Thread.Sleep(2000);
            }
        }

        //ISP-Entry
        _serialPort.RtsEnable = false;

        Thread.Sleep(50);
        //Reset-Pin
        _serialPort.DtrEnable = true;
        
        Thread.Sleep(50);
        //Reset-Pin
        _serialPort.DtrEnable = false;
        _serialPort.Close();
     }   
}


Unfortunatly that doesn't work.
The communication with the same device via Flash Magic or generally via UART with other small c# programs works all well.
Any help or good ideas would be very much appreciated.

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