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我一直在用C++編寫一個串行端口應用程序，它可以通過虛擬串行端口處理雙向通信到我爲ARM寫的藍牙堆棧微處理器。一些非固定數量的寫入後，串行端口導致死鎖（C++）
我相當肯定的嵌入式方面很好，因爲在另一個主要從微處理器接收數據的應用程序中不會導致崩潰。在這個應用程序中，我使用一個簡單的協議將二進制數據從C++串口應用程序發送到64字節的微處理器，以控制何時停止發送等等。
我處理這兩個應用程序的方式非常相似，所以我想知道當我發送數據而不是接收它時導致問題時是否有區別。
代碼編寫和調試在Visual Studio 2010中
有一件事我發現真是難得的是，這個應用程序使用一個USB轉串口線連接但在虛擬COM端口僵局！同時調試處理器似乎沒有任何問題，所以可能會導致這個問題？
編輯
Hacving看着更深的坑偏偏執行調用堆棧：
[email protected]（）+ 0×15字節
它基本上進入像這樣：
Initialis E：
brate = CBR_112500;
com_name[0]='C';
com_name[1]='O';
com_name[2]='M';
com_name[3]=com_name[4]=com_name[5]=com_name[6]=0;
printf("Select COM Port: ");
scanf("%s", &com_name[3]);
if (Connect(com_name,brate)!=SLCONNECT_OK)
{
printf("\t\t\t\t....Could not open to port, exiting\r\n");
}
連接：
在這裏，我本來創建第二個線程來處理讀取，但決定也許是死鎖的原因。然後我刪除線程並同步運行所有內容，但仍然存在相同的問題。
int Connect(const char *portname,int baudrate)
{
DCB dev_cont_block;
if (port_h != INVALID_HANDLE_VALUE)
{
return(SLCONNECT_ALREADY_CONNECTED);
}
if(strlen(portname)>4) // if COM10 or above use \\.\COM10
{
char *longportname;
int i;
longportname = (char *) malloc(strlen(portname)+5);
if(longportname != NULL)
{
longportname[0] = '\\';
longportname[1] = '\\';
longportname[2] = '.';
longportname[3] = '\\';
for(i=0;i<strlen(portname);i++)
longportname[4+i]=portname[i];
longportname[4+i] = 0;
port_h = CreateFile(longportname, GENERIC_READ | GENERIC_WRITE ,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
delete(longportname);
}
else
return(SLCONNECT_CONNECT_FAILED);
}
else
port_h = CreateFile(portname, GENERIC_READ | GENERIC_WRITE ,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
if (port_h==INVALID_HANDLE_VALUE)
{
return(SLCONNECT_CONNECT_FAILED);
}
if (GetCommState(port_h,&dev_cont_block))
{
dev_cont_block.BaudRate = baudrate;
dev_cont_block.ByteSize = 8;
dev_cont_block.StopBits = ONESTOPBIT;
dev_cont_block.fParity = FALSE;
dev_cont_block.Parity = NOPARITY;
dev_cont_block.fOutxCtsFlow = TRUE;
dev_cont_block.fOutxDsrFlow = FALSE;
dev_cont_block.fRtsControl = RTS_CONTROL_DISABLE;
if (!SetCommState(port_h, &dev_cont_block)) return(SLCONNECT_SETUP_PORT_FAILED);
}
else return(SLCONNECT_SETUP_PORT_FAILED);
PurgeComm(port_h,PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR);
keepLooping=1;
///_beginthread(Watcher,0,this);
//WatcherThread = (HANDLE)_beginthreadex(NULL, 0, Watcher, this, 0, NULL);
return(SLCONNECT_OK);
}
主要應用
我在這裏等待用戶命令啓動，將其發送到uprocessor，等待響應，送包，等待響應等，直到完整的二進制文件被髮送。
我在這裏省略了一些不相關的部分，比如我如何處理文件的結尾等等。
sendbuf[0] = 'x'; // The 'x' is just a placeholder
sendbuf[1] = 'x';
sendbuf[2] = 'x';
sendbuf[3] = 'x';
sendbuf[4] = 'x';
sendbuf[5] = 'x';
sendbuf[6] = 'x';
sendbuf[7] = 'x';
printf("Press 1 to begin Upgrade\r\n");
if(_getch() == '1')
{
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
if(Send('x') == SLSEND_OK)
{
printf("=> Note 'Set Firmware Mode'");
}
}
while(1)
{
while(true)
{
ClearCommError(port_h,&l_dwErrors, &l_ComStat);
if(l_ComStat.cbInQue)
{
ReadFile(port_h, &data, 1, &Received, NULL);
if(Received == 1)
{
Received = DllRxD(DataBuffer,64, data);
if(Received > 0)
{
if (DataBuffer[0] == 'x') //Note received
{
printf("\n\r=> Note ");
if(DataBuffer[3] == 'x' && DataBuffer[4] == 'x')
{
if(DataBuffer[5] == 'x')
{
if(DataBuffer[6] == 0x00)
{
printf("'Firmware Packet Received Sucessfully'");
result = 1;
break;
}
else
{
printf("'Error In Packet Message [0x0%d]'",(unsigned int)DataBuffer[6]);
result = -1;
break;
}
}
}
if(DataBuffer[3] =='x' && DataBuffer[4] == 'x')
{
if(DataBuffer[5] == 'x')
{
printf("Mode has changed to: Firmware Upgrade Mode");
result = 2;
break;
}
}
}
else
{
printf("=> ERRROR 'Unexpected Message'");
result = -2;
break;
}
}
}
}
}//while(true)
if(result == 1 || result == 2)
{
UpdateCRC('x', &crc);
UpdateCRC('x', &crc);
UpdateCRC('x', &crc);
UpdateCRC('x', &crc);
UpdateCRC('x', &crc);
UpdateCRC('x', &crc);
UpdateCRC('x', &crc);
UpdateCRC('x', &crc);
for (i = 0; i < 64; i++)
{
fread(&Packet[i],1,1,pFile);
if(feof(pFile))
Packet[i] = 0xFF;
if(Packet[i] == 'x')
{
UpdateCRC(Packet[i],&crc);
UpdateCRC(Packet[i],&crc);
}
else
UpdateCRC(Packet[i],&crc);
}
UpdateCRC('x', &crc);
UpdateCRC('x', &crc);
Send(x); //framing
Send(x);
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
Send('x');
for (i = 0; i < 64; i++)
{
if(Packet[i] == 'x')
{
Send(Packet[i]); **//this set of sends is where i receive the deadlock error message, it's not always the same place it happens though**
Send(Packet[i]);
}
else
Send(Packet[i]);
}
Send('x');
Send('x');
Send((crc >> 8));
if(Send((crc & 0xFF)) == SLSEND_OK)
{
printf("\n\r\t\t\t\t....Packet Sent (%u Bytes Total)",counter*64);
}
發送
這是實際的發送功能
int Send(unsigned char sdata)
{
unsigned long bytesWritten=0;
unsigned int rtn;
**//This is where the program stops in the source code i can view**
//Error received is "this is the next statement to execute when this thread returns from it's current function"
rtn = WriteFile(port_h,&sdata,1,&bytesWritten,NULL);
if (rtn)
return(SLSEND_OK);
else
return(SLSEND_UNKNOWN_ERROR);
}
我已經開始處理超時現在和數據終端就緒線，我已經嘗試啓用和禁用它（我使用沒有真正的硬件線，因爲它遍佈藍牙），仍然有相同的死鎖。 「這是線程從當前函數返回時要執行的下一個語句」位於我稱之爲writefile的行上 – 2015-02-11 10:34:21