MicroController Connection

"sorry, i don't quite understand what you are trying to mean..."

You say, when you connect the PC and microcontroller to gether, it doesn't work.

What you neeed to determine is why it doesn't work - then you can fix it!

There are 3 possibilities:

1. There's a problem at the PC end;
2. There's a problem at the microcontroller end;
3. There's problems at both ends!

Dan's suggestion is to help you check if the microcontroller end is working: by removing your PC software from the equation, and using a terminal emulator instead, you can verify that the microcontroller end is working.

You should start by running the microcontroller software in the simulator - this eliminates any problems due to your hardware.
Set the simulator up so that it uses a PC COM port for its serial IO (see the Manual).

In the simulator, you can single-step, examine variables, etc, etc...

"sorry, i don't quite understand what you are trying to mean..."

You say, when you connect the PC and microcontroller to gether, it doesn't work.

What you neeed to determine is why it doesn't work - then you can fix it!

There are 3 possibilities:

1. There's a problem at the PC end;
2. There's a problem at the microcontroller end;
3. There's problems at both ends!

Dan's suggestion is to help you check if the microcontroller end is working: by removing your PC software from the equation, and using a terminal emulator instead, you can verify that the microcontroller end is working.

You should start by running the microcontroller software in the simulator - this eliminates any problems due to your hardware.
Set the simulator up so that it uses a PC COM port for its serial IO (see the Manual).

In the simulator, you can single-step, examine variables, etc, etc...

is there some one that can help me write a program for read and write?? using Visual C++

You should use MSComm ActiveX control (mscomm32.ocx) under Visual C++ which is quite easy to use. I could send you a sample if you want to.

Jean-Pierre

none of my beeswax, but what does this have to do with Keil software?

Are there no websites for PC programming.

so, 1) this is not the place and 2) the right place will, probably, have more answers.

Erik

"is there some one that can help me write a program for read and write?? using Visual C++"

You need to do some serious study!
This is not something that can be taught in just a few brief posts on a forum like this!
(and, anyhow, this forum is for Keil - not Microsoft tools!)

There are hundreds of books available on "Teach Yourself MSVC Programming", or you could look for taught courses in your locality.

"Are there no websites for PC programming."

For all Microsoft development issues, your first port of call should be the MS Developer Network, MSDN:
http://msdn.microsoft.com/

Teach Yourself C++ in 24 Hours: Complete Starter Kit
Jessie Liberty, David Horvath

http://www.amazon.co.uk/exec/obidos/ASIN/0672326817/qid=1132708016/sr=2-1/ref=sr_2_11_1/203-5826643-3305507

can pls send me??

know how to send 80h to the microcontroller and returning 55H??

MSDN has examples of serial communication programming on a Win32 platform.

There are hundreds upon hundreds of Win32 programming websites on the internet, however Keil's Discussion Forum is not among them.

My Usenet news server lists 2111 Microsoft-related newsgroups.

Given all of that, I think your time would be much better spent inquiring about PC-related topics on PC-related venues, and not here, but that's just my opinion.

know how to send 80h to the microcontroller and returning 55H??

This does, for a change, sound like an uC problem

HOWEVER, we here are willing to HELP you, but not to do it for you.

post YOUR code and help will be forthcoming.

Erik

"how to send 80h to the microcontroller"

That is a PC programming excercise - eg, MSVC - for which you need to find a PC programming forum

"and returning 55H??"

Now you need a microprocessor system (both hardware and software) to receive the 80H and send a 55H.

Look at the CSAMPLE example in your Keil\C51\examples\ folder - it illustrates receiving data and sending responses on the 8051 serial port.

erm... i did the codings... its like this...

void CSerialComm::Send(HANDLE *pComm, CString str)
{
	unsigned char StopByte=0x1;
	unsigned long int n_out;

	str = "0x80";
	WriteFile(*pComm, str, str.GetLength(),&n_out , NULL);
	WriteFile(*pComm, &StopByte, 1, &n_out, NULL);
}

void CSerialComm::Receive(HANDLE *pComm, CString str1)
{
	char cRxByte;
	DWORD dwRead;

	while(cRxByte!=0x1)
	{
		ReadFile(*pComm, &cRxByte, 1, &dwRead, NULL);
		str1+=cRxByte;
	}
	MessageBox("Acknowledge Received");
	//	MessageBox(str1);
}

void CSerialComm::initComm(HANDLE *pComm)
{
//	HANDLE hComm;

//	hComm = CreateFile( "COM1:",
//                    GENERIC_READ | GENERIC_WRITE,
//                    0,
//                    0,
//                    OPEN_EXISTING,
//                    FILE_FLAG_OVERLAPPED,
//                  0);
//	if (hComm == INVALID_HANDLE_VALUE)
//	{
//	}
   // error opening port; abort



	*pComm = CreateFile("COM1:", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
	if (*pComm ==INVALID_HANDLE_VALUE)
	{
		//MessageBox("Please input value !");
	}

	//FillMemory(&dcb, sizeof(dcb), 0);
	dcb.DCBlength = sizeof(dcb);
	dcb.BaudRate = CBR_9600;
	dcb.fBinary = TRUE;
	dcb.fDtrControl = DTR_CONTROL_DISABLE;
	dcb.fRtsControl = RTS_CONTROL_DISABLE;
	dcb.ByteSize = 8;
	dcb.Parity = NOPARITY;
	dcb.StopBits = ONESTOPBIT;

	if (!SetCommState(*pComm, &dcb))
	{
		//MessageBox("Wrong Port");
	}
}

"tell me wats wrong..."

You're asking in the wrong forum, that's what's wrong!

That's PC code - so you need to ask about it in a PC forum!

What have you done to debug it?
MSVC includes a debugger!

Yes indeed it's the wrong forum. However I could send you a functionnal sample so at least you could try to solve your micro-controller communications problems with people sharing there knowledge on this forum (however HyperTerminal is enough for this purpose...). For this I need an e-mail.

Jean-Pierre

candy_5689@yahoo.com