Serial port or usb port

[Pitufo]

Is there such a code in C++ that can read the information coming in from the serial port or the usb port? Can someone please help me...

[ahoodin]

Well the only way I think that question is valid is when it comes to virtual ports. Currently it is possible to map a USB port to a COM port. Then data from that port should be treated as serial data, and any serial port APIs *should* work.

[Codeplug]

From a serial port: http://msdn.microsoft.com/en-us/library/ms810467.aspx
From a USB port: You write a driver for the device. If the device already has a driver, what kind of device is it?

gg

[Pitufo]

it is a microcontroller

[Pitufo]

for example, if i want to use this code to open a serial port, which libraries do i use?

using namespace std;

int main()
{
HANDLE hComm;
hComm = CreateFile( gszPort,
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
0);
if (hComm == INVALID_HANDLE_VALUE)
// error opening port; abort
}

[ahoodin]

First you better install a virtual serial port driver. I used to use one to synch up my Palm Pilot. Time to google my friend.

[Pitufo]

thanks

[ahoodin]

Youre welcome pitufo.

:D

[Pitufo]

I have this code but does it work with usb port?

#include <windows.h>
#include <commctrl.h>
#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;

int main()
{

//1 Opening the serial port
HANDLE hUsb;
hUsb = CreateFile("USB3",
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
0);
if(hUsb==INVALID_HANDLE_VALUE){
if(GetLastError()==ERROR_FILE_NOT_FOUND){
cout<<"Serial port does not exist";
}
//some other error occurred. Inform user.
}

//2 Setting Parameters
DCB dcbSerial;
DCB dcbSerialParams = {0};
dcbSerial.DCBlength=sizeof(dcbSerialParams);
if (!GetCommState(hUsb, &dcbSerialParams)) {
//error getting state
}
dcbSerialParams.BaudRate=CBR_9600;
dcbSerialParams.ByteSize=8;
dcbSerialParams.StopBits=ONESTOPBIT;
dcbSerialParams.Parity=NOPARITY;
if(!SetCommState(hSerial, &dcbSerialParams)){
//error setting serial port state
}

//3 Setting timeouts
COMMTIMEOUTS timeouts={0};
timeouts.ReadIntervalTimeout=50;
timeouts.ReadTotalTimeoutConstant=50;
timeouts.ReadTotalTimeoutMultiplier=10;
timeouts.WriteTotalTimeoutConstant=50;
timeouts.WriteTotalTimeoutMultiplier=10;
if(!SetCommTimeouts(hSerial, &timeouts)){
//error occureed. Inform user
}

//4 Reading/Writing data
char szBuff[100] = {0};
DWORD dwBytesRead = 0;
if(!ReadFile(hSerial, szBuff, 100, &dwBytesRead, NULL)){

//error occurred. Report to user.
}

//5 Closing down
CloseHandle(hSerial);
return 0;
}

[mariocampeau]

I'm curious. Did your code worked? Because I am also looking for a way to read USB data coming from a MCU into a ICH-7 Intel board.

[fantasy1215]

Well the only way I think that question is valid is when it comes to virtual ports. Currently it is possible to map a USB port to a COM port. Then data from that port should be treated as serial data, and any serial port APIs *should* work.
Can you tell more in detail?