ACE下串口编程

首先看下相关的类，在ACE下使用非常简单，后面是ACE自带的一个列子。

/** * @class ACE_TTY_IO * * @brief Class definitions for platform specific TTY features. * * This class represents an example interface for a specific * device (a serial line). It extends the capability of the * underlying DEV_IO class by adding a control method that takes * a special structure (Serial_Params) as argument to allow a * comfortable user interface (away from that annoying termios * structure, which is very specific to UNIX). */

什么是tty？

tty是终端设备的统称，tty一词源于Teletypes，或者teletypewriters，原来指的是电传打字机，是通过串行线用打印机键盘通过阅读和发送信息的东西，后来这东西被键盘与显示器取代，所以现在叫终端比较合适。ACE中的这个ACE_TTY_IO类不长，这里全部拿来看下。

class ACE_Export ACE_TTY_IO : public ACE_DEV_IO{public:  enum Control_Mode  {    SETPARAMS,              ///< Set control parameters.    GETPARAMS               ///< Get control parameters.  };  struct ACE_Export Serial_Params  {    Serial_Params (void);    /** Specifies the baudrate at which the communnication port operates. */    int baudrate;    /** Specifies the minimum number of bytes in input buffer before XON char        is sent. Negative value indicates that default value should        be used (Win32). */    int xonlim;    /** Specifies the maximum number of bytes in input buffer before XOFF char        is sent. Negative value indicates that default value should        be used (Win32). */    int xofflim;    /** Specifies the minimum number of characters for non-canonical        read (POSIX). */    unsigned int readmincharacters;    /** Specifies the time to wait before returning from read. Negative value        means infinite timeout. */    int readtimeoutmsec;    /** Enable/disable parity checking. */    bool parityenb;    /** Specifies the parity mode. POSIX supports "even" and "odd" parity.        Additionally Win32 supports "mark" and "space" parity modes. */    const char *paritymode;    /** Enable & set CTS mode. Note that RTS & CTS are enabled/disabled        together on some systems (RTS/CTS is enabled if either        <code>ctsenb</code> or <code>rtsenb</code> is set). */    bool ctsenb;    /** Enable & set RTS mode. Note that RTS & CTS are enabled/disabled        together on some systems (RTS/CTS is enabled if either        <code>ctsenb</code> or <code>rtsenb</code> is set).        - 0 = Disable RTS.        - 1 = Enable RTS.        - 2 = Enable RTS flow-control handshaking (Win32).        - 3 = Specifies that RTS line will be high if bytes are available              for transmission. After transmission RTS will be low (Win32). */    int rtsenb;    /** Enable/disable software flow control on input. */    bool xinenb;    /** Enable/disable software flow control on output. */    bool xoutenb;    /** Specifies if device is a modem (POSIX). If not set modem status        lines are ignored. */    bool modem;    /** Enable/disable receiver (POSIX). */    bool rcvenb;    /** Controls whether DSR is disabled or enabled (Win32). */    bool dsrenb;    /** Controls whether DTR is disabled or enabled. */    bool dtrdisable;    /** Data bits. Valid values 5, 6, 7 and 8 data bits.        Additionally Win32 supports 4 data bits. */    unsigned char databits;    /** Stop bits. Valid values are 1 and 2. */    unsigned char stopbits;  };  /** Interface for reading/writing serial device parameters. */  int control (Control_Mode cmd, Serial_Params *arg) const;#if defined (ACE_NEEDS_DEV_IO_CONVERSION)  /** This is necessary to pass ACE_TTY_IO as parameter to DEV_Connector. */  operator ACE_DEV_IO &();#endif /* ACE_NEEDS_DEV_IO_CONVERSION */};

ACE的读Demo，所在目录ACE_wrappers\examples\IPC_SAP\DEV_SAP

#include "ace/DEV_Addr.h"#include "ace/DEV_Connector.h"#include "ace/TTY_IO.h"int ACE_TMAIN (int argc, ACE_TCHAR *argv[]){  if (argc < 2)    ACE_ERROR_RETURN ((LM_ERROR,                       ACE_TEXT ("usage: %s device-filename\n"),                       argv[0]),                      1);  ACE_TTY_IO read_dev;  ACE_DEV_Connector con;  if (con.connect (read_dev,                   ACE_DEV_Addr (argv[1])) == -1)    ACE_ERROR_RETURN ((LM_ERROR,                       ACE_TEXT ("%p\n"),                       argv[1]),                      1);  ACE_TTY_IO::Serial_Params myparams;  myparams.baudrate = 19200;  myparams.xonlim = 0;  myparams.xofflim = 0;  myparams.readmincharacters = 0;  myparams.readtimeoutmsec = 10*1000; // 10 seconds  myparams.paritymode = "EVEN";  myparams.ctsenb = false;  myparams.rtsenb = 0;  myparams.xinenb = false;  myparams.xoutenb = false;  myparams.modem = false;  myparams.rcvenb = true;  myparams.dsrenb = false;  myparams.dtrdisable = false;  myparams.databits = 8;  myparams.stopbits = 1;  if (read_dev.control (ACE_TTY_IO::SETPARAMS,                        &myparams) == -1)    ACE_ERROR_RETURN ((LM_ERROR,                       ACE_TEXT ("%p control\n"),                       argv[1]),                      1);  // Read till character 'q'.  for (char readback = 'x'; readback != 'q'; )    {      ssize_t bytes_read =        read_dev.recv ((void *) &readback, 1);      if (bytes_read == 1)          ACE_DEBUG ((LM_DEBUG,                      ACE_TEXT ("read: %c\n"),                      readback));      else if (bytes_read == 0)          ACE_DEBUG ((LM_DEBUG,                      ACE_TEXT ("timeout!\n")));      else if (bytes_read == -1)          ACE_ERROR_RETURN ((LM_ERROR,                             ACE_TEXT ("%p  recv\n"),                             argv[1]), 1);    }  return 0;}