Windows與ARM2440串口通信的問(wèn)題

Wind-Son

寫了一個(gè)Windows下模擬超級(jí)終端與串口通信的程序�，F(xiàn)在已經(jīng)能相互通信，但有一個(gè)問(wèn)題：每次我往串口寫入數(shù)據(jù)后，這個(gè)數(shù)據(jù)馬上會(huì)被負(fù)責(zé)讀串口的線程讀到。怎么能象超級(jí)終端里那樣讀和寫完全分開(kāi)？請(qǐng)問(wèn)怎么解決？

[ 本帖最后由 Wind-Son 于 2008-11-19 11:47 編輯 ]

Wind-Son

代碼：

BOOL CComS::Connect(ComParam* p) {     CString name;     ASSERT(p);     if (m_hCom) {         ErrMsg(IDS_ERR_COM_AREADY_OPEN);         return FALSE;     }     name.Format(_T("COM%d"), p->u.Coms.ID);     m_hCom = ::CreateFile(name,         GENERIC_READ|GENERIC_WRITE,         0,         NULL,         OPEN_EXISTING,         /*FILE_ATTRIBUTE_NORMAL|*/FILE_FLAG_OVERLAPPED,         NULL);     if (m_hCom == INVALID_HANDLE_VALUE) {         ReportLastErr();         return FALSE;     }     DCB LocalDCB;     LocalDCB.DCBlength = sizeof(LocalDCB);     if (!::GetCommState(m_hCom, &LocalDCB)) {         ReportLastErr();         ::CloseHandle(m_hCom);         return FALSE;     }     LocalDCB.BaudRate = p->u.Coms.Baudrate;     LocalDCB.fBinary = TRUE;     LocalDCB.fParity = FALSE;     LocalDCB.fOutxCtsFlow = FALSE;     LocalDCB.fOutxDsrFlow = FALSE;     LocalDCB.fDtrControl = DTR_CONTROL_DISABLE;//DTR_CONTROL_HANDSHAKE;     LocalDCB.fRtsControl = RTS_CONTROL_DISABLE;//DTR_CONTROL_HANDSHAKE;     LocalDCB.fOutX = FALSE;     LocalDCB.fInX = FALSE;     LocalDCB.fNull = FALSE;     LocalDCB.fNull=FALSE;     LocalDCB.ByteSize = 8;     LocalDCB.Parity = NOPARITY;     LocalDCB.StopBits = ONESTOPBIT;     if (!::SetCommState(m_hCom, &LocalDCB)) {         ReportLastErr();         ::CloseHandle(m_hCom);         return FALSE;     }     DWORD err;     if (!::ClearCommError(m_hCom, &err, NULL)) {         ReportLastErr();         return FALSE;     }     memset(&m_ComOverlap, 0, sizeof(OVERLAPPED));     m_ComOverlap.hEvent = ::CreateEvent(NULL, TRUE, FALSE, NULL);     m_Event = ::CreateEvent(NULL, TRUE, FALSE, NULL);     int byteUsedTime = 14400 / 115200 +1 + 1000;     COMMTIMEOUTS timeouts = {20 + byteUsedTime, byteUsedTime, 1000, byteUsedTime , 20};     SetCommTimeouts(m_hCom, &timeouts) ;     SetCommMask(m_hCom, EV_RXCHAR|EV_TXEMPTY );//設(shè)置事件驅(qū)動(dòng)的類型     SetupComm(m_hCom, 10204, 5210);     PurgeComm(m_hCom, PURGE_RXCLEAR|PURGE_TXCLEAR|PURGE_RXABORT|PURGE_TXABORT);     InitializeCriticalSection(&m_Critical);     return TRUE; } BOOL CComS::Disconnect() {     DWORD err;     if (!::ClearCommError(m_hCom, &err, NULL))         ReportLastErr();     if (!::CloseHandle(m_hCom))         ReportLastErr();     SetEvent(m_ComOverlap.hEvent);     Sleep(100);     if (!::CloseHandle(m_ComOverlap.hEvent))         ReportLastErr();     if (!::CloseHandle(m_Event))         ReportLastErr();     m_hCom = NULL;     return TRUE; }

eveson

沒(méi)明白問(wèn)題在哪里

Wind-Son

代碼2：

BOOL CComS::Send(LPBYTE pBuf, int len, DWORD MaxTime) {     BOOL ret = FALSE;     OVERLAPPED overlap;     ASSERT(m_hCom != NULL);     ASSERT(len < 2000);     DWORD written = 0;     SetEvent(m_ComOverlap.hEvent);     memset(&overlap, 0, sizeof(OVERLAPPED));     overlap.hEvent = ::CreateEvent(NULL, TRUE, FALSE, NULL);     EnterCriticalSection(&m_Critical);     BYTE Buf[100] = "rbbttqqyybb";     //if (!::WriteFile(m_hCom, Buf, 10, &written, &overlap)) {     if (!::WriteFile(m_hCom, pBuf, len, &written, &overlap)) {         if (::GetLastError() == ERROR_IO_PENDING) {             if (::WaitForSingleObject(overlap.hEvent, MaxTime) == WAIT_OBJECT_0) {                 if (!GetOverlappedResult(m_hCom, &overlap, &written, FALSE))                     ReportLastErr();                 ret = TRUE;             }         }     } else {         ret = TRUE;     }     if (!::CloseHandle(overlap.hEvent))         ReportLastErr();     LeaveCriticalSection(&m_Critical);     return ret; } DWORD CComS::Receive(LPBYTE pDestBuf, int length, DWORD MaxTime) { #define RX_BUF_LEN    10000     static BYTE buffer[RX_BUF_LEN];     static int curOut = -1, curLen = 0;     int tmp, len;     ASSERT(m_hCom != NULL);     ASSERT(length < 2000);     tmp = length;         if (curLen) {         len = min(length, curLen);         memcpy(pDestBuf, &buffer[curOut], len);         length -= len;         pDestBuf += len;         curOut += len;         curLen -= len;         if (length == 0)             return len;     }     ASSERT(curLen == 0);     EnterCriticalSection(&m_Critical);     DWORD dwEvtMask = 0;     OVERLAPPED os;     memset(&os, 0, sizeof(OVERLAPPED));     os.hEvent = m_Event;     ResetEvent(m_Event);     SetCommMask(m_hCom, EV_RXCHAR|EV_TXEMPTY);     COMSTAT ComStat;     DWORD dwLength, dwErrorFlags, dwBytesRead;     if (!WaitCommEvent(m_hCom, &dwEvtMask, &os)) {         if (::WaitForSingleObject(m_ComOverlap.hEvent, 0) == WAIT_OBJECT_0) {             ResetEvent(m_ComOverlap.hEvent);             goto out;         }         if (GetLastError() != ERROR_IO_PENDING)             goto out;         if (::WaitForSingleObject(m_Event, 300) == WAIT_OBJECT_0) {             if (!GetOverlappedResult(m_hCom, &os, &dwBytesRead, FALSE)) {                 ReportLastErr();                 goto out;             }             //break;         }         //dwEvtMask = 0;     }     if (dwEvtMask & EV_TXEMPTY) {         //PurgeComm(m_hCom, PURGE_TXCLEAR|PURGE_TXABORT);         goto out;     }     if (!(dwEvtMask & EV_RXCHAR))         goto out;         ClearCommError(m_hCom, &dwErrorFlags, &ComStat) ;     dwLength = ComStat.cbInQue;     if (dwLength > 0) {                        ResetEvent(os.hEvent);         ASSERT(dwLength <= RX_BUF_LEN);         if (!ReadFile(m_hCom, buffer, dwLength,             &dwBytesRead, &os)) {             ReportLastErr();         }         //GetOverlappedResult(m_hCom, &os, &dwBytesRead, TRUE);         len = min((int)dwBytesRead, length);         memcpy(pDestBuf, buffer, len);         curLen = dwBytesRead - len;         curOut = len;         length -= len;                 } out:     LeaveCriticalSection(&m_Critical);     return tmp - length; }

Wind-Son

原帖由 eveson 于 2008-11-19 11:41 發(fā)表
沒(méi)明白問(wèn)題在哪里

本來(lái)應(yīng)該是接收線程只可以讀到從開(kāi)發(fā)板發(fā)上來(lái)的數(shù)據(jù)（上行數(shù)據(jù)），可實(shí)際上發(fā)送到板子上的數(shù)據(jù)（下行數(shù)據(jù)）也被它讀到了
上行和下行的數(shù)據(jù)混到一起了

[ 本帖最后由 Wind-Son 于 2008-11-19 11:46 編輯 ]

stranger_dl

讀寫保護(hù)��！或者雙通道，

eveson

怎么會(huì)啊，串口應(yīng)該會(huì)有接受buffer和發(fā)送buffer的啊。

Wind-Son

原帖由 eveson 于 2008-11-19 16:49 發(fā)表
怎么會(huì)啊，串口應(yīng)該會(huì)有接受buffer和發(fā)送buffer的啊。

我也覺(jué)得很奇怪，搞了兩天都沒(méi)解決。按理流文件發(fā)出去的數(shù)據(jù)都讀不回來(lái)才對(duì)啊

eveson

好好檢查下代碼吧，肯定哪個(gè)地方不小心讓你寫錯(cuò)了。