Comunication with PC and MCU over RS232.

pr2501

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Comunication with PC and MCU over RS232.

· Gepostet: 12.06.2008 - 19:53 Uhr · #1

My APP consist of two edit boxes:
Edit1Read for TX (transfer data from variable "outMCU") and
Edit2Write for RX (receive data into variable " inMCU").

Whats the way to approach to this problem?
What must i do with AVRco and what with Delphi?

miparo

Schreiberling

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Herkunft: Germany
Alter: 59
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Dabei seit: 09 / 2007

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Re: Comunication with PC and MCU over RS232.

· Gepostet: 12.06.2008 - 20:40 Uhr · #2

Hello pr2501,
you need for Delphi Cport(TComport) then you can do:

Code

Procedure TForm1.ComPort1RxChar(Sender: TObject; Count: Integer);
Var ch: char;
Begin
  // receive event from the UART component
  If SLIPactive1 Then Begin
    Try
      While Form1.ComPort1.Read(ch, 1) = 1 Do Begin
        EditBoxTx.Text:=ch;
      End;
    Except
    End;
  End;
End;

Code

procedure Sendbyte;
Begin
   Str := 'Hello';
  ComPort1.WriteStr(Str); // string type variable
  ComPort1.Write(Str[1], Length(Str)); // no defined type
//  Comport1.Write(pB^, count); // Array ?
end;

In AVRco look at Page 64 3.11

When you transfer more than one byte the SLIP Function is the best way

miparo

pr2501

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Re: Comunication with PC and MCU over RS232.

· Gepostet: 14.06.2008 - 08:24 Uhr · #3

Thank you

And about hardware what do i need?

From (RXD) PD0 and (TXD) PD1
to which pins of com port1 of PC need to be connected?

pr2501

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Re: Comunication with PC and MCU over RS232.

· Gepostet: 14.06.2008 - 08:27 Uhr · #4

I have hardware for programing and i can switch leds on outputs.

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Re: Comunication with PC and MCU over RS232.

· Gepostet: 15.06.2008 - 11:09 Uhr · #5

You must not connect any AVR I/O pin directly to the PC com port! PC com port uses voltages up to +/- 12 volts! You will need a RS232 transceiver like ST202, ST232 or similar devices.

pr2501

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Re: Comunication with PC and MCU over RS232.

· Gepostet: 15.06.2008 - 14:24 Uhr · #6

thank you

Comunication with PC and MCU over RS232.

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