关于HP hw6515的GPS

[yangfan1981]

我的程序是采用单独线程轮询串口获取数据的方式。

刚开始可以正常获取$GPGGA $GPGSV $GPRMC等GPS数据。

后来莫名其妙的就获取不到了。得到的全是$PGLOR,RID,PPC,BTL.....

很晕。网上搜了，说不是设备原因，是程序的原因。

望高手帮忙解答

[yangfan1981]

怎么没人回复啊！

[yangfan1981]

UINT PortReadThread(LPVOID lpvoid)
{
DWORD dwCommModemStatus;

// Specify a set of events to be monitored for the port.
SetCommMask (m_hPort, EV_RXCHAR | EV_CTS | EV_DSR | EV_RLSD | EV_RING);
//=============================
int ReadFalge=0,ReadCount=0;

while (m_hPort != INVALID_HANDLE_VALUE)
{
// Wait for an event to occur for the port.
WaitCommEvent (m_hPort, &dwCommModemStatus, 0);

// Re-specify the set of events to be monitored for the port.
SetCommMask (m_hPort, EV_RXCHAR | EV_CTS | EV_DSR | EV_RING);

if (dwCommModemStatus & EV_RXCHAR)
{
// Loop for waiting for the data.
int K;
BYTE bText[MAXLENGTH];

K = 0;

for(;;)
{
DWORD nLength;
COMSTAT ComStat;
DWORD dwErrorFlags;
BYTE bBuffer[MAXLENGTH];

ClearCommError(m_hPort,&dwErrorFlags,&ComStat);

nLength = 1; //每次只读一个字节
ReadFile(m_hPort,bBuffer,nLength,&nLength,NULL);

if(bBuffer[0] == '\n')
{
bText[K] = 0;

if ((bText[0] == '$') & (bText[1] == 'G') & (bText[2] == 'P') &
(bText[3] == 'G') & (bText[4] == 'G') & (bText[5] == 'A') )
{
WriteGGAToFile(bText);
}
else if ((bText[0] == '$') & (bText[1] == 'G') & (bText[2] == 'P') &
(bText[3] == 'G') & (bText[4] == 'S') & (bText[5] == 'V') )
{
WriteGSVToFile(bText);
}
else if ((bText[0] == '$') & (bText[1] == 'G') & (bText[2] == 'P') &
(bText[3] == 'R') & (bText[4] == 'M') & (bText[5] == 'C') )
{
WriteRMCToFile(bText);
}

K = 0;

}
else if(bBuffer[0] == '$')
{
K = 0;
bText[K] = bBuffer[0];
K++;
}
else
{
bText[K] = bBuffer[0];
K++;
}
Sleep(1);
}
}
// Retrieve modem control-register values.s
// GetCommModemStatus (m_hPort, &dwCommModemStatus);
}

return true;
}