VC串口编程DCB.fparity设置失败

vincent29 2011-08-08 10:28:26

源代码如下：



GetCommState(hSerialPort, &dcb);

printf("dcb.BaudRate = %d\n", dcb.BaudRate);

printf("dcb.fParity = %d\n", dcb.fParity);

    #if 1

    dcb.DCBlength = sizeof(DCB);

    dcb.BaudRate = 115200;

    dcb.fBinary = TRUE;

    dcb.fParity = 1;

    dcb.fOutxCtsFlow = FALSE;

    dcb.fOutxDsrFlow = FALSE;

    dcb.fDtrControl = DTR_CONTROL_DISABLE;

    dcb.fDsrSensitivity = FALSE;

    dcb.fTXContinueOnXoff = TRUE;

    dcb.fOutX = FALSE;

    dcb.fInX = FALSE;

    dcb.fErrorChar = FALSE;

    dcb.fNull = FALSE;

    dcb.fRtsControl = RTS_CONTROL_DISABLE;

    dcb.fAbortOnError = FALSE;

    dcb.XonLim = 0;

    dcb.XoffLim = 0;

    dcb.ByteSize = 8;

    dcb.Parity = EVENPARITY;

    dcb.StopBits = ONESTOPBIT;

    dcb.XonChar = 17;

    dcb.XoffChar = 19;

    dcb.ErrorChar = 0;

    dcb.EofChar = 0;

    dcb.EvtChar = 0;

    dcb.wReserved = 0;

    //

    // Set the new serial port configuration.

    //

    printf("set %d \n", SetCommState(hSerialPort, &dcb));

printf("after set dcb.fParity = %d\n", dcb.fParity);

printf("after set dcb.Parity = %d\n", dcb.Parity);

printf("get last error %d\n", GetLastError());

printf("get %d \n",  GetCommState(hSerialPort, &dcb));

printf("dcb.BaudRate = %d\n", dcb.BaudRate);

printf("dcb.fParity = %d\n", dcb.fParity);

printf(" dcb.Parity = %d\n", dcb.Parity);

printf("dcb.ByteSize = %d\n", dcb.ByteSize);

//===================

输出结果为：

dcb.BaudRate = 115200
dcb.fParity = 0
set 1
after set dcb.fParity = 1
after set dcb.Parity = 2
get last error 0
get 1
dcb.BaudRate = 115200
dcb.fParity = 0
dcb.Parity = 2
dcb.ByteSize = 8

为什么唯独只有这个fParity设置不对，我现在PC和ARM通讯出错，估计是因为这个引起的，
大家发表一下意见啊。分全部给了

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b43713337 2012-08-01

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dcb.fParity =TRUE;
or dcb.fParity =FALSE 肯定没问题

JohnYale 2012-07-15

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提前
一年了这个问题还没解决？
我也遇到了同样的问题，而且SetCommState的返回值是true

vincent29 2011-08-08

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继续等答案

vincent29 2011-08-08

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顶一下，急用啊。

zgl7903 2011-08-08

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dcb.fParity = 1; // enable parity checking
dcb.Parity=x; // 0-4=no,odd,even,mark,space

学飞的笨鸟 2011-08-08

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还有查看DCB 结构的定义为：
typedef struct _DCB {
DWORD DCBlength;
DWORD BaudRate;
DWORD fBinary :1;
DWORD fParity :1;
DWORD fOutxCtsFlow :1;
DWORD fOutxDsrFlow :1;
DWORD fDtrControl :2;
DWORD fDsrSensitivity :1;
DWORD fTXContinueOnXoff :1;
DWORD fOutX :1;
DWORD fInX :1;
DWORD fErrorChar :1;
DWORD fNull :1;
DWORD fRtsControl :2;
DWORD fAbortOnError :1;
DWORD fDummy2 :17;
WORD wReserved;
WORD XonLim;
WORD XoffLim;
BYTE ByteSize;
BYTE Parity;
BYTE StopBits;
char XonChar;
char XoffChar;
char ErrorChar;
char EofChar;
char EvtChar;
WORD wReserved1;
} DCB;
可见，fParity为位域(bit field)，其取值只能为“0”或“1”。

学飞的笨鸟 2011-08-08