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PIC and Computer interaction

 
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amal



Joined: 24 Aug 2005
Posts: 2
Location: vietnam

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PIC and Computer interaction
PostPosted: Wed Sep 07, 2005 8:28 am     Reply with quote
Hello!!
I try to use PC to control my PIC, but i don't know how to make my own interface (a program on PC to control PIC). Somebody can tell me some tips to write a program to control serial port or parallel port (with C or VB...)? Thanks
sseidman



Joined: 14 Mar 2005
Posts: 159

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PostPosted: Wed Sep 07, 2005 9:08 am     Reply with quote
I/O port programming in windows is non-trivial, even for console applications. Many folks just use a terminal emulation like hyperterminal to talk directly with the serial port.

If you want to use C++, I'd download a library like http://www.codeproject.com/system/serial.asp or
http://www.marshallsoft.com/
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Wed Sep 07, 2005 11:02 am     Reply with quote
sseidman wrote:
I/O port programming in windows is non-trivial, even for console applications. Many folks just use a terminal emulation like hyperterminal to talk directly with the serial port.

If you want to use C++, I'd download a library like http://www.codeproject.com/system/serial.asp or
http://www.marshallsoft.com/


I/O port programming in windows is trivial, especially with VB. VB provides the MSCOMM control. You can find tons of examples doing this.

To do it in Visual C++ isn't that bad either. Here's a snippet from my bootloader app
Code:

/****************************************************************************

    FUNCTION:   EnterBootMode

    PURPOSE:   This function is provided to open communications to the
            PIC through a serial port and place the PIC into bootmode.
            The function returns a handle to the opened port or returns a negative number on an error.

****************************************************************************/
INT APIENTRY EnterBootMode(LPSTR ComPort, DWORD BitRate, DWORD ReadTimeOut)
{
   HANDLE hComm;
   DCB dcb = {0};
   COMMTIMEOUTS CommTmOut = {0};
   
   // Get a handle to the port.
   hComm = CreateFile( ComPort, 
                       GENERIC_READ | GENERIC_WRITE,
                       0,
                       NULL,
                       OPEN_EXISTING,
                       FILE_ATTRIBUTE_NORMAL,
                       0);
   if (hComm == INVALID_HANDLE_VALUE)
      return -1;

   // Get the current state of the port
   FillMemory(&dcb, sizeof(dcb), 0);

   if (!GetCommState(hComm, &dcb)){
      return -1;
   }
   else{
      dcb.BaudRate = BitRate;
      dcb.Parity = NOPARITY;
      dcb.StopBits = ONESTOPBIT;
      dcb.fDtrControl = DTR_CONTROL_DISABLE;
      dcb.fRtsControl = RTS_CONTROL_DISABLE;
      dcb.fOutX = FALSE;
      dcb.fInX = FALSE;
      dcb.fOutxCtsFlow = FALSE;
      dcb.fOutxDsrFlow = FALSE;
      dcb.ByteSize = 8;
   }
      
   if (!SetCommState(hComm, &dcb))
      return -1;


   //Set the timeout conditions
   if (!GetCommTimeouts(hComm, &CommTmOut)){
      return -1;
   }
   else{
      CommTmOut.ReadIntervalTimeout = MAXDWORD;
      CommTmOut.ReadTotalTimeoutMultiplier = MAXDWORD;
      CommTmOut.ReadTotalTimeoutConstant = ReadTimeOut;
   }

   if (!SetCommTimeouts(hComm, &CommTmOut))
      return -1;

   //Send the boot command
   if (SendText(hComm, BootCmd, SIZEOFBOOTCMD) != SIZEOFBOOTCMD)
   {
      CloseHandle(hComm);
      return -1;
   }
    CloseHandle(hComm);
    return 0;
}
amal



Joined: 24 Aug 2005
Posts: 2
Location: vietnam

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PostPosted: Mon Sep 12, 2005 5:31 am     Reply with quote
Sorry about my late reply.
Your information is really helpful. Thanks for showing me the way!!! Razz
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