/**************************************************************************
* -Name: win_InitSerial ( port, settings )
*
* -Description: This routine initializes the communications port.
*
* -Arguments: GIZ_PORT porttoopen - communications port to be used
* GIZ_PORT_COM1 - for communications port 1
* GIZ_PORT_COM2 - for communications port 2
* short portsettings - communications port parameters
* modes are OR'd together to achieve comm port settings.
* Default: GIZBAUD_9600 | GIZNONE | GIZONESTOPBIT | GIZEIGHTBITS.
*
* baud rates : GIZBAUD_300, GIZBAUD_600, GIZBAUD_1200,
* GIZBAUD_2400, GIZBAUD_4800, GIZBAUD_9600
*
* -Notes: Gizzmo must have comm port settings of no parity (GIZNONE),
* 1 stop bit (GIZONESTOPBITS), and 8 data bits (GIZEIGHTBITS).
* The baud rate is the only settings that can currently
* be varied. To do this, please review the programmers'
* guide on changing the baud rate.
*
* -Returns : 0 if comm port setup okay
*************************************************************************/
long win_InitSerial ( int port )
{
long err;
DWORD start,current;
char aBuf[16];
DWORD bytesRead;
if((err = setup_dcb( (GIZ_PORT)(port-1), 0, (short)LINES_LOW))!=0)
return err;
SISetLinesLow();
while ((current-start) < PowerOnTimeDelay) current = GetTickCount(); // PowerOnTime delay before launch to let calibrator wake up and stabilize
/* create timeout data structure */
GetCommTimeouts(PortID,&TimeOutData);
TimeOutData.ReadIntervalTimeout = 2500;// millisecs between characters
TimeOutData.ReadTotalTimeoutMultiplier = 250; // millisec multiplier by number of characters
TimeOutData.ReadTotalTimeoutConstant = 2500; // 2.5 sec + nchar * 250 msec total time out(about 3secs);
TimeOutData.WriteTotalTimeoutMultiplier = 250;
TimeOutData.WriteTotalTimeoutConstant = 250;
SetCommTimeouts(PortID,&TimeOutData);
start = GetTickCount();
current = GetTickCount();
SISetLinesHigh();
while ((current-start) < PowerOnTimeDelay) current = GetTickCount(); // PowerOnTime delay before launch to let calibrator wake up and stabilize
ReadFile(
PortID, // handle of file to read
aBuf, // address of buffer that receives data
1, // number of bytes to read: the count byte and the command byte
&bytesRead, // address of number of bytes read
NULL // address of structure for data
);
return (err);
}
__bool CSerialPort::open()
{
char buf[64];
DCB dcb;
COMMTIMEOUTS tout;
if(INVALID_HANDLE_VALUE != m_hFile){
return __true;
}
sprintf(buf, "\\\\.\\COM%d", m_iPortNo);
m_hFile = CreateFile(
buf,
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
0
);
utils_trace(
"COM %d opened as 0x%08x\n",
m_iPortNo,
m_hFile
);
if(INVALID_HANDLE_VALUE==m_hFile){
return __false;
}
get_config_string();
if( !setup_dcb(m_Setting, &dcb) ){
close();
utils_trace(
"COM%d, error in setting string : %s, code %d\n",
m_iPortNo,
m_Setting,
GetLastError()
);
return __false;
}
if( !SetCommState(m_hFile, &dcb) ){
utils_error(
"COM%d, SetCommState failed with %d.\n",
m_iPortNo,
GetLastError()
);
close();
}
utils_trace(
"Ok, COM%d setting applied : '%s'\n",
m_iPortNo,
m_Setting
);
if( !GetCommTimeouts(m_hFile, &tout) ){
close();
utils_trace(
"COM%d, Error in GetCommTimeouts, Code %d.\n",
m_iPortNo,
GetLastError()
);
return __false;
}
tout.ReadIntervalTimeout = MAXDWORD;
tout.ReadTotalTimeoutMultiplier = 0;
tout.ReadTotalTimeoutConstant = 0;
tout.WriteTotalTimeoutMultiplier = 10;
tout.WriteTotalTimeoutConstant = 0;
if(!SetCommTimeouts(m_hFile, &tout)){
utils_trace(
"COM%d, Error in SetCommTimeouts, Code %d.\n",
m_iPortNo,
GetLastError()
);
close();
return __false;
}
m_OverlappedEvent = new CEvent(0, TRUE, FALSE);
if(!m_OverlappedEvent || !m_OverlappedEvent->Handle()){
utils_trace(
"COM%d, error %d creating overlapped event.\n",
m_iPortNo,
GetLastError()
);
close();
return __false;
}
if( !PurgeComm(
m_hFile,
PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR
)
){
utils_error(
"COM%d, Warning : PurgeComm failed with %d\n",
m_iPortNo,
GetLastError()
);
}
COMMCONFIG cfg;
DWORD size;
cfg.dwSize = size = sizeof(cfg);
if( !GetCommConfig(m_hFile, &cfg, &size) ){
utils_error(
"Warning : GetCommConfig failed with %d\n",
GetLastError()
);
}else{
utils_trace(
"COM%d setting is : '%d,%c,%d,%d(%08x)'\n",
m_iPortNo,
cfg.dcb.BaudRate,
Parity(&cfg.dcb),
cfg.dcb.ByteSize,
Stopbits(cfg.dcb.StopBits),
*((DWORD*)&cfg.dcb + 2)
);
}
return __true;
}
