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#include <iostream>
#include <string>
#include <cstdlib>
#include <windows.h>
#include <cmath>
using namespace std;
HANDLE hSerial;
int initSerialPort()
{
int ok = 0;
hSerial = CreateFile("COM5",
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
0);
if (hSerial == INVALID_HANDLE_VALUE)
{
if(GetLastError() == ERROR_FILE_NOT_FOUND)
{
cout << "COM5 does not exist" << endl;
}
else
{
cout << "Unknown error during opening of COM5\nAllready in use?" << endl;
}
}
else
{
cout << "COM5 opened successfully" << endl;
DCB dcbParameters;
dcbParameters.DCBlength=sizeof(dcbParameters);
if (!GetCommState(hSerial, &dcbParameters))
{
cout << "Error getting serial port state" << endl;
}
else
{
dcbParameters.BaudRate=CBR_9600;
dcbParameters.ByteSize=8;
dcbParameters.StopBits=ONESTOPBIT;
dcbParameters.Parity=EVENPARITY;
if(!SetCommState(hSerial, &dcbParameters))
{
cout << "Error setting config parameters" << endl;
}
else
{
cout << "config parameters configured correctly" << endl;
COMMTIMEOUTS timeouts;
timeouts.ReadIntervalTimeout = 0;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier = 0;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 0;
if(!SetCommTimeouts(hSerial, &timeouts)){
cout << "Error setting timing configuration" << endl;
}
else
{
cout << "Timing parameters set\nCOM5 ready to be used"<< endl;
ok = 1;
}
}
}
}
return ok;
}
std::string getNewPacket()
{
std::string code;
char recvBuffer[40];
DWORD dwBytesRead;
static unsigned char totalBuffer[2048];
static int nextBytePosition = 0;
while(1)
{
if(!ReadFile(hSerial, recvBuffer, sizeof(recvBuffer), &dwBytesRead, NULL))
{
cout << "Error during reading" << endl;
break;
}
if (dwBytesRead == 0)
{
break;
}
else
{
memcpy(&totalBuffer[nextBytePosition], recvBuffer, dwBytesRead);
nextBytePosition += dwBytesRead;
}
}
int stop = 0;
int state = 0;
for(int i = 0 ; (i < nextBytePosition) && (stop == 0) ; i++)
{
switch(state)
{
case 0:
if(totalBuffer[i] == 0x10)
{
state = 1;
}
break;
case 1:
if(totalBuffer[i] == 0x10)
{
i++;
stop = 1;
for(int j = 0 ; j <= i ; j++)
{
char temp[5];
sprintf(temp, "%.2x", totalBuffer[j]);
code.append(temp);
}
memmove(&totalBuffer[0], &totalBuffer[i + 1], (i + 1));
nextBytePosition -= (i + 1);
}
break;
}
}
return code;
}
int main()
{
cout << "Initialize the serial port" << endl;
if(initSerialPort() == 1)
{
do
{
system ("CLS");
std::string code;
code = getNewPacket();
if(code != "")
{
std::string id_strnormal = "42";
std::string start_str = code.substr(0, 2);
std::string id_str = code.substr(2, 2);
if (start_str != "10")
{
//clear buffer
}
if (id_str == id_strnormal)
{
cout << "New data from GPS:" << code << endl;
}
}
}while (1);
CloseHandle(hSerial);
}
system ("pause");
return 0;
}
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