当前位置：文江博客话题详情

如何用c程序进行串口通信？

发布于 2024-07-19 08:05:43 字数 50 浏览 9 评论 0原文

使用vc++编译器如何访问串口。 Bioscom()函数可以在Turbo C中使用。

原文

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

囍孤女 2024-07-26 08:05:43

您必须像这样使用 CreateFile 打开适当的 com 设备。适应您的需求。

// Handle of the communication connection 
void *comHandle;

// Port parameters, set to your own needs
unsigned portIndex;
unsigned baudRate;
unsigned dataBits;
Parity   parity;
unsigned stopBits;
bool     handShake;
int      readIntervalTimeout;
int      readTotalTimeoutMultiplier;
int      readTotalTimeoutConstant;
int      writeTotalTimeoutMultiplier;
int      writeTotalTimeoutConstant;
DCB dcb;
COMMTIMEOUTS ct;

// Create COM-device name string 
char comDevice[20];
sprintf(comDevice, "\\\\.\\COM%d", portIndex);

// Open serial port
_comHandle = CreateFile(comDevice, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (comHandle == INVALID_HANDLE_VALUE)
{
  return false;
}


ct.ReadIntervalTimeout         = readIntervalTimeout;        
ct.ReadTotalTimeoutMultiplier  = readTotalTimeoutMultiplier; 
ct.ReadTotalTimeoutConstant    = readTotalTimeoutConstant;   
ct.WriteTotalTimeoutMultiplier = writeTotalTimeoutMultiplier;
ct.WriteTotalTimeoutConstant   = writeTotalTimeoutConstant;  

if (!GetCommState(_comHandle,&dcb))
{
  disconnect();
  return false;
}

dcb.BaudRate        = baudRate;  
dcb.ByteSize        = (BYTE)dataBits;
dcb.Parity          = (parity == None) ? NOPARITY : ((parity == Even) ? EVENPARITY : ODDPARITY);
dcb.StopBits        = (stopBits > 1) ? TWOSTOPBITS : ONESTOPBIT;
dcb.fRtsControl     = handShake ? RTS_CONTROL_HANDSHAKE : RTS_CONTROL_ENABLE;
dcb.fOutxCtsFlow    = handShake;
dcb.fOutxDsrFlow    = handShake;
dcb.fDtrControl     = handShake ? DTR_CONTROL_HANDSHAKE : DTR_CONTROL_ENABLE;
dcb.fDsrSensitivity = handShake;
dcb.fOutX           = FALSE;
dcb.fInX            = FALSE;
dcb.fErrorChar      = FALSE;
dcb.fNull           = FALSE;
dcb.fAbortOnError   = TRUE;

// Set port state
if( !SetCommState(_omHandle, &dcb) ||
    !SetCommTimeouts(comHandle, &ct) ||
    !SetupComm(comHandle, 64, 64) ||
    !PurgeComm(comHandle, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR))
{
  disconnect();
  return false;
}

阅读相应的 MSDN 条目以了解所调用的各种函数。另外，为了简洁起见，我省略了断开连接方法。

you have to open the appropriate com-device with CreateFile like so. Adapt to your needs.

// Handle of the communication connection 
void *comHandle;

// Port parameters, set to your own needs
unsigned portIndex;
unsigned baudRate;
unsigned dataBits;
Parity   parity;
unsigned stopBits;
bool     handShake;
int      readIntervalTimeout;
int      readTotalTimeoutMultiplier;
int      readTotalTimeoutConstant;
int      writeTotalTimeoutMultiplier;
int      writeTotalTimeoutConstant;
DCB dcb;
COMMTIMEOUTS ct;

// Create COM-device name string 
char comDevice[20];
sprintf(comDevice, "\\\\.\\COM%d", portIndex);

// Open serial port
_comHandle = CreateFile(comDevice, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (comHandle == INVALID_HANDLE_VALUE)
{
  return false;
}


ct.ReadIntervalTimeout         = readIntervalTimeout;        
ct.ReadTotalTimeoutMultiplier  = readTotalTimeoutMultiplier; 
ct.ReadTotalTimeoutConstant    = readTotalTimeoutConstant;   
ct.WriteTotalTimeoutMultiplier = writeTotalTimeoutMultiplier;
ct.WriteTotalTimeoutConstant   = writeTotalTimeoutConstant;  

if (!GetCommState(_comHandle,&dcb))
{
  disconnect();
  return false;
}

dcb.BaudRate        = baudRate;  
dcb.ByteSize        = (BYTE)dataBits;
dcb.Parity          = (parity == None) ? NOPARITY : ((parity == Even) ? EVENPARITY : ODDPARITY);
dcb.StopBits        = (stopBits > 1) ? TWOSTOPBITS : ONESTOPBIT;
dcb.fRtsControl     = handShake ? RTS_CONTROL_HANDSHAKE : RTS_CONTROL_ENABLE;
dcb.fOutxCtsFlow    = handShake;
dcb.fOutxDsrFlow    = handShake;
dcb.fDtrControl     = handShake ? DTR_CONTROL_HANDSHAKE : DTR_CONTROL_ENABLE;
dcb.fDsrSensitivity = handShake;
dcb.fOutX           = FALSE;
dcb.fInX            = FALSE;
dcb.fErrorChar      = FALSE;
dcb.fNull           = FALSE;
dcb.fAbortOnError   = TRUE;

// Set port state
if( !SetCommState(_omHandle, &dcb) ||
    !SetCommTimeouts(comHandle, &ct) ||
    !SetupComm(comHandle, 64, 64) ||
    !PurgeComm(comHandle, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR))
{
  disconnect();
  return false;
}

Read the appropriate MSDN entries for the various functions called. Also, I've left out the disconnect method for brevity reasons.

回复收藏 0 原文