695 lines
18 KiB
C++
695 lines
18 KiB
C++
#include "cwCommon.h"
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#include "cwLog.h"
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#include "cwCommonImpl.h"
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#include "cwMem.h"
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#include "cwSerialPort.h"
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#include <poll.h>
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#include <termios.h>
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#include <unistd.h> // ::close()
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#include <fcntl.h> // O_RDWR
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#include <sys/ioctl.h> // TIOCEXCL
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namespace cw
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{
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namespace serialPort
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{
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typedef struct port_str
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{
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unsigned _userId;
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char* _deviceStr;
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int _deviceH;
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unsigned _baudRate;
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unsigned _cfgFlags;
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callbackFunc_t _cbFunc;
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void* _cbArg;
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struct termios _ttyAttrs;
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struct pollfd* _pollfd;
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struct port_str* _link;
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} port_t;
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typedef struct device_str
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{
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unsigned _recvBufByteN;
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void* _recvBuf;
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port_t* _portL;
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unsigned _pollfdN;
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struct pollfd* _pollfd;
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} device_t;
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inline device_t* _handleToPtr(handle_t h)
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{ return handleToPtr<handle_t,device_t>(h); }
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bool _isPortOpen( port_t* p )
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{ return p->_deviceH != -1; }
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// Given a 'userId' return the assoc'd port record.
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port_t* _idToPort( device_t* d, unsigned userId, bool errorFl = true )
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{
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port_t* p = d->_portL;
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while( p != nullptr )
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{
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if( userId == p->_userId )
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return p;
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p = p->_link;
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}
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if( errorFl )
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cwLogError(kInvalidIdRC,"No port was found with id:%i.",userId);
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return nullptr;
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}
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rc_t _getAttributes( port_t* p, struct termios& attr )
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{
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if( tcgetattr(p->_deviceH, &attr) == -1 )
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return cwLogSysError(kGetAttrFailRC,errno,"Error getting tty attributes from %s.",p->_deviceStr);
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return kOkRC;
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}
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// Called to read the serial device when data is known to be waiting.
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rc_t _receive( device_t* d, port_t* p, unsigned& readN_Ref, void* buf=nullptr, unsigned bufByteN=0 )
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{
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rc_t rc = kOkRC;
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void* b = buf;
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unsigned bN = bufByteN;
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int n = 0;
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readN_Ref = 0;
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if( !_isPortOpen(p) )
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return cwLogWarningRC( kResourceNotAvailableRC, "An attempt was made to read from a closed serial port.");
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// if a buffer was not given
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if( b ==nullptr || bufByteN == 0 )
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{
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b = d->_recvBuf;
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bN = d->_recvBufByteN;
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}
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// if attempt to read the port succeeded ...
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if((n =read( p->_deviceH, b, bN )) != -1 )
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{
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readN_Ref = n;
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if( n>0 && p->_cbFunc != nullptr && (buf == nullptr || bufByteN == 0) )
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p->_cbFunc( p->_cbArg, p->_userId, b, n );
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}
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else
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{
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// ... or failed and it wasn't because the port was empty
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if( errno != EAGAIN)
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rc = cwLogSysError(kReadFailRC,errno,"An attempt to read the serial port '%s' failed.", p->_deviceStr );
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}
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return rc;
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}
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// Block devices waiting for data on a port. If userId is valid then wait for data on a specific port otherwise
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// wait for data on all ports.
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rc_t _poll( device_t* d, unsigned timeOutMs, unsigned& readN_Ref, unsigned userId=kInvalidId, void* buf=nullptr, unsigned bufByteN=0 )
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{
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rc_t rc = kOkRC;
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int sysRC;
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readN_Ref = 0;
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// if there are not ports then there is nothing to do
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if( d->_pollfdN == 0 )
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return rc;
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struct pollfd* pfd = d->_pollfd; // first struct pollfd
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unsigned pfdN = d->_pollfdN; // count of pollfd's
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port_t* p = d->_portL; // port assoc'd with first pollfd
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// if only one port is to be read ...
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if( userId != kInvalidId )
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{
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// ... then locate it
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if((p = _idToPort(d,userId)) == nullptr )
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return kInvalidArgRC;
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pfd = p->_pollfd;
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pfdN = 1;
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}
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// A port to poll must exist
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if( p == nullptr )
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return cwLogError(kInvalidArgRC,"The port with id %i could not be found.",userId);
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// block waiting for data on one of the ports
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if((sysRC = ::poll(pfd,pfdN,timeOutMs)) == 0)
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rc = kTimeOutRC;
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else
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{
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// ::poll() encountered a system exception
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if( sysRC < 0 )
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return cwLogSysError(kReadFailRC,errno,"Poll failed on serial port.");
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// interate through the ports looking for the ones which have data waiting ...
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for(unsigned i=0; p!=nullptr; p=p->_link,++i)
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if( p->_pollfd->revents & POLLIN )
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{
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unsigned actualReadN = 0;
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// ... then read the data
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if((rc = _receive( d, p, actualReadN, buf, bufByteN )) != kOkRC )
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return rc;
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readN_Ref += actualReadN;
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}
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}
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return rc;
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}
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rc_t _closePort( device_t* d, port_t* p )
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{
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rc_t rc = kOkRC;
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// if the port is already closed
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if( p->_deviceH != -1 )
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{
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// Block until all written output has been sent from the device.
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// Note that this call is simply passed on to the serial device driver.
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// See tcsendbreak(3) ("man 3 tcsendbreak") for details.
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if (tcdrain(p->_deviceH) == -1)
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{
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rc = cwLogSysError(kFlushFailRC,errno,"Error waiting for serial device '%s' to drain.", p->_deviceStr );
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goto errLabel;
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}
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// It is good practice to reset a serial port back to the state in
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// which you found it. This is why we saved the original termios struct
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// The constant TCSANOW (defined in termios.h) indicates that
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// the change should take effect immediately.
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if (tcsetattr(p->_deviceH, TCSANOW, &p->_ttyAttrs) == -1)
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{
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rc = cwLogSysError(kSetAttrFailRC,errno,"Error resetting tty attributes on serial device '%s'.",p->_deviceStr);
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goto errLabel;
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}
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if( ::close(p->_deviceH ) != 0 )
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{
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rc = cwLogSysError(kCloseFailRC,errno,"Port close failed on serial dvice '%s'.", p->_deviceStr);
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goto errLabel;
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}
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}
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// reset the state of the port record
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mem::release(p->_deviceStr);
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p->_userId = kInvalidId;
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p->_deviceH = -1;
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p->_baudRate = 0;
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p->_cfgFlags = 0;
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p->_cbFunc = nullptr;
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p->_cbArg = nullptr;
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p->_pollfd->events = 0;
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p->_pollfd->fd = -1;
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errLabel:
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return rc;
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}
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// Destroy the manager object.
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rc_t _destroy( device_t* d )
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{
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rc_t rc = kOkRC;
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port_t* p = d->_portL;
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while( p != nullptr )
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{
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port_t* p0 = p->_link;
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if((rc = _closePort(d,p)) != kOkRC )
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return rc;
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mem::release(p);
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p = p0;
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}
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mem::release(d->_recvBuf);
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mem::release(d);
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return rc;
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}
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}
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}
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cw::rc_t cw::serialPort::create( handle_t& h, unsigned recvBufByteN )
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{
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rc_t rc;
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if((rc = destroy(h)) != kOkRC )
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return rc;
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device_t* d = mem::allocZ<device_t>();
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if( recvBufByteN > 0 )
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{
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d->_recvBuf = mem::allocZ<uint8_t>( recvBufByteN );
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d->_recvBufByteN = recvBufByteN;
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}
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h.set(d);
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return rc;
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}
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cw::rc_t cw::serialPort::destroy( handle_t& h )
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{
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rc_t rc = kOkRC;
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if( !h.isValid() )
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return rc;
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device_t* d = _handleToPtr(h);
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if((rc = _destroy(d)) != kOkRC )
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return rc;
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h.clear();
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return rc;
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}
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cw::rc_t cw::serialPort::createPort( handle_t h, unsigned userId, const char* deviceStr, unsigned baudRate, unsigned cfgFlags, callbackFunc_t cbFunc, void* cbArg )
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{
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rc_t rc = kOkRC;
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device_t* d = _handleToPtr(h);
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struct termios options;
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port_t* p;
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// locate the port with the given user id
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if((p = _idToPort(d,userId,false)) != nullptr )
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if((rc = _closePort(d,p)) != kOkRC )
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return rc;
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// if a new port record must be allocated
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if( p == nullptr )
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{
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unsigned portN = 0;
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// look for an available port and count the number of existing ports
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for(p=d->_portL; p!=nullptr; p=p->_link,++portN)
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if( !_isPortOpen(p) )
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break;
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if( p == nullptr )
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{
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// allocate and link in the new port desc. record
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p = mem::allocZ<port_t>();
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p->_deviceH = -1;
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// link in the new port as the first port
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p->_link = d->_portL;
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d->_portL = p;
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// A new port has been allocated reallocate the pollfd array
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mem::release(d->_pollfd);
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d->_pollfdN = portN + 1;
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d->_pollfd = mem::allocZ<struct pollfd>(d->_pollfdN);
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// link the port records to the their assoc'd pollfd record in d->_pollfd[]
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port_t* pp = d->_portL;
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for(unsigned i=0; pp!=nullptr; ++i,pp=pp->_link)
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{
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pp->_pollfd = d->_pollfd + i;
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pp->_pollfd->fd = pp->_deviceH;
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pp->_pollfd->events = POLLIN;
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}
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}
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}
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// open the port
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if( (p->_deviceH = ::open(deviceStr, O_RDWR | O_NOCTTY | O_NONBLOCK)) == -1 )
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{
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rc = cwLogSysError(kOpenFailRC,errno,"Error opening serial '%s'",cwStringNullGuard(deviceStr));
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goto errLabel;;
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}
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// Note that open() follows POSIX semantics: multiple open() calls to
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// the same file will succeed unless the TIOCEXCL ioctl is issued.
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// This will prevent additional opens except by root-owned processes.
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// See tty(4) ("man 4 tty") and ioctl(2) ("man 2 ioctl") for details.
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if( ioctl(p->_deviceH, TIOCEXCL) == -1 )
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{
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rc = cwLogSysError(kResourceNotAvailableRC,errno,"The serial device '%s' is already in use.", cwStringNullGuard(deviceStr));
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goto errLabel;
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}
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// Now that the device is open, clear the O_NONBLOCK flag so
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// subsequent I/O will block.
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// See fcntl(2) ("man 2 fcntl") for details.
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/*
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if (fcntl(_deviceH, F_SETFL, 0) == -1)
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{
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_error("Error clearing O_NONBLOCK %s - %s(%d).", pr.devFilePath.c_str(), strerror(errno), errno);
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goto errLabel;
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}
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*/
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// Get the current options and save them so we can restore the
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// default settings later.
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if (tcgetattr(p->_deviceH, &p->_ttyAttrs) == -1)
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{
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rc = cwLogSysError(kGetAttrFailRC,errno,"Error getting tty attributes from the device '%s'.",deviceStr);
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goto errLabel;
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}
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// The serial port attributes such as timeouts and baud rate are set by
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// modifying the termios structure and then calling tcsetattr to
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// cause the changes to take effect. Note that the
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// changes will not take effect without the tcsetattr() call.
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// See tcsetattr(4) ("man 4 tcsetattr") for details.
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options = p->_ttyAttrs;
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// Set raw input (non-canonical) mode, with reads blocking until either
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// a single character has been received or a 100ms timeout expires.
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// See tcsetattr(4) ("man 4 tcsetattr") and termios(4) ("man 4 termios")
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// for details.
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cfmakeraw(&options);
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options.c_cc[VMIN] = 1;
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options.c_cc[VTIME] = 1;
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// The baud rate, word length, and handshake options can be set as follows:
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// set baud rate
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cfsetspeed(&options, baudRate);
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options.c_cflag |= CREAD | CLOCAL; // ignore modem controls
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// set data word size
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cwClrBits(options.c_cflag, CSIZE); // clear the word size bits
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cwEnaBits(options.c_cflag, CS5, cwIsFlag(cfgFlags, kDataBits5Fl));
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cwEnaBits(options.c_cflag, CS6, cwIsFlag(cfgFlags, kDataBits6Fl));
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cwEnaBits(options.c_cflag, CS7, cwIsFlag(cfgFlags, kDataBits7Fl));
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cwEnaBits(options.c_cflag, CS8, cwIsFlag(cfgFlags, kDataBits8Fl));
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cwClrBits(options.c_cflag, PARENB); // assume no-parity
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// if the odd or even parity flag is set
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if( cwIsFlag( cfgFlags, kEvenParityFl) || cwIsFlag( cfgFlags, kOddParityFl ) )
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{
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cwSetBits(options.c_cflag, PARENB);
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if( cwIsFlag(cfgFlags, kOddParityFl ) )
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cwSetBits( options.c_cflag, PARODD);
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}
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// set two stop bits
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cwEnaBits( options.c_cflag, CSTOPB, cwIsFlag(cfgFlags, k2StopBitFl));
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// set hardware flow control
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//cwEnaBits(options.c_cflag, CCTS_OFLOW, cwIsFlag(cfgFlags, kCTS_OutFlowCtlFl));
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//cwEnaBits(options.c_cflag, CRTS_IFLOW, cwIsFlag(cfgFlags, kRTS_InFlowCtlFl));
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//cwEnaBits(options.c_cflag, CDTR_IFLOW, cwIsFlag(cfgFlags, kDTR_InFlowCtlFl));
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//cwEnaBits(options.c_cflag, CDSR_OFLOW, cwIsFlag(cfgFlags, kDSR_OutFlowCtlFl));
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//cwEnaBits(options.c_cflag, CCAR_OFLOW, cwIsFlag(cfgFlags, kDCD_OutFlowCtlFl));
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cwClrBits(options.c_cflag,CRTSCTS); // turn-off hardware flow control
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// 7 bit words, enable even parity, CTS out ctl flow, RTS in ctl flow
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// note: set PARODD and PARENB to enable odd parity)
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//options.c_cflag |= (CS7 | PARENB | CCTS_OFLOW | CRTS_IFLOW );
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// Cause the new options to take effect immediately.
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if (tcsetattr(p->_deviceH, TCSANOW, &options) == -1)
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{
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rc = cwLogSysError(kSetAttrFailRC,errno,"Error setting tty attributes on serial device %.", deviceStr);
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goto errLabel;
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}
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p->_userId = userId;
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p->_deviceStr = cw::mem::allocStr( deviceStr );
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p->_baudRate = baudRate;
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p->_cfgFlags = cfgFlags;
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p->_cbFunc = cbFunc;
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p->_cbArg = cbArg;
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p->_pollfd->fd = p->_deviceH;
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p->_pollfd->events = POLLIN;
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h.set(d);
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errLabel:
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if( rc != kOkRC )
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_closePort(d,p);
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return rc;
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}
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cw::rc_t cw::serialPort::destroyPort(handle_t h, unsigned userId )
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{
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rc_t rc = kOkRC;
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if( !isopen(h,userId) )
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return rc;
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device_t* d = _handleToPtr(h);
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port_t* p;
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// find the port to close
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if((p = _idToPort(d,userId)) == nullptr )
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return kInvalidArgRC;
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// Close the selected port
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// Note that closed ports are simply marked as closed (deviceH==-1) but not removed from the list.
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if((rc = _closePort(d,p)) != kOkRC )
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return rc;
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h.clear();
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return rc;
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}
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unsigned cw::serialPort::portCount( handle_t h )
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{
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device_t* d = _handleToPtr(h);
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return d->_pollfdN;
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}
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unsigned cw::serialPort::portIndexToId( handle_t h, unsigned index )
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{
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device_t* d = _handleToPtr(h);
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unsigned i = 0;
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for(port_t* p=d->_portL; p!=nullptr; p=p->_link,++i)
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if( i == index )
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return p->_userId;
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return kInvalidId;
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}
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bool cw::serialPort::isopen( handle_t h, unsigned userId )
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{
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device_t* d = _handleToPtr(h);
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port_t* p;
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if((p = _idToPort(d,userId)) == nullptr )
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return false;
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return _isPortOpen(p);
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}
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cw::rc_t cw::serialPort::send( handle_t h, unsigned userId, const void* byteA, unsigned byteN )
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{
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rc_t rc = kOkRC;
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device_t* d = _handleToPtr(h);
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port_t* p;
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if( byteN == 0 )
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return rc;
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|
if((p = _idToPort(d,userId)) == nullptr )
|
|
return kInvalidArgRC;
|
|
|
|
|
|
// implement a non blocking write - if less than all the bytes were written then iterate
|
|
unsigned i = 0;
|
|
do
|
|
{
|
|
int n = 0;
|
|
if((n = write( p->_deviceH, ((char*)byteA)+i, byteN-i )) == -1 )
|
|
{
|
|
rc = cwLogSysError(kWriteFailRC,errno,"Write failed on serial port '%s'.", p->_deviceStr );
|
|
break;
|
|
}
|
|
|
|
i += n;
|
|
|
|
|
|
}while( i<byteN );
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
// Non-blocking read
|
|
cw::rc_t cw::serialPort::receive_nb( handle_t h, unsigned userId, unsigned& readN_Ref, void* buf, unsigned bufN)
|
|
{
|
|
rc_t rc = kOkRC;
|
|
device_t* d = _handleToPtr(h);
|
|
port_t* p;
|
|
|
|
if((p = _idToPort(d,userId)) == nullptr )
|
|
return kInvalidArgRC;
|
|
|
|
return _receive( d, p, readN_Ref, buf,bufN );
|
|
|
|
return rc;
|
|
}
|
|
|
|
cw::rc_t cw::serialPort::receive( handle_t h, unsigned timeOutMs, unsigned& readN_Ref)
|
|
{
|
|
device_t* d = _handleToPtr(h);
|
|
|
|
return _poll(d,timeOutMs,readN_Ref);
|
|
|
|
}
|
|
|
|
cw::rc_t cw::serialPort::receive( handle_t h, unsigned timeOutMs, unsigned& readN_Ref, unsigned userId, void* buf, unsigned bufByteN )
|
|
{
|
|
device_t* d = _handleToPtr(h);
|
|
port_t* p;
|
|
|
|
if((p = _idToPort(d,userId)) == nullptr )
|
|
return kInvalidArgRC;
|
|
|
|
return _poll(d,timeOutMs,readN_Ref,userId,buf,bufByteN);
|
|
}
|
|
|
|
const char* cw::serialPort::device( handle_t h, unsigned userId)
|
|
{
|
|
device_t* d = _handleToPtr(h);
|
|
port_t* p;
|
|
if((p = _idToPort(d,userId)) == NULL)
|
|
return NULL;
|
|
|
|
return p->_deviceStr;
|
|
}
|
|
|
|
unsigned cw::serialPort::baudRate( handle_t h, unsigned userId )
|
|
{
|
|
device_t* d = _handleToPtr(h);
|
|
port_t* p;
|
|
if((p = _idToPort(d,userId)) == NULL)
|
|
return 0;
|
|
|
|
return p->_baudRate;
|
|
}
|
|
|
|
unsigned cw::serialPort::cfgFlags( handle_t h, unsigned userId )
|
|
{
|
|
device_t* d = _handleToPtr(h);
|
|
port_t* p;
|
|
if((p = _idToPort(d,userId)) == NULL)
|
|
return 0;
|
|
|
|
return p->_cfgFlags;
|
|
}
|
|
|
|
unsigned cw::serialPort::readInBaudRate( handle_t h, unsigned userId )
|
|
{
|
|
struct termios attr;
|
|
device_t* d = _handleToPtr(h);
|
|
port_t* p;
|
|
if((p = _idToPort(d,userId)) == NULL)
|
|
return 0;
|
|
|
|
if((_getAttributes(p,attr)) != kOkRC )
|
|
return 0;
|
|
|
|
return cfgetispeed(&attr);
|
|
|
|
}
|
|
|
|
unsigned cw::serialPort::readOutBaudRate( handle_t h, unsigned userId )
|
|
{
|
|
struct termios attr;
|
|
device_t* d = _handleToPtr(h);
|
|
port_t* p;
|
|
if((p = _idToPort(d,userId)) == NULL)
|
|
return 0;
|
|
|
|
if((_getAttributes(p,attr)) != kOkRC )
|
|
return 0;
|
|
|
|
return cfgetospeed(&attr);
|
|
|
|
}
|
|
|
|
unsigned cw::serialPort::readCfgFlags( handle_t h, unsigned userId )
|
|
{
|
|
struct termios attr;
|
|
unsigned result = 0;
|
|
device_t* d = _handleToPtr(h);
|
|
port_t* p;
|
|
|
|
if((p = _idToPort(d,userId)) == NULL)
|
|
return 0;
|
|
|
|
if((_getAttributes(p,attr)) == false )
|
|
return 0;
|
|
|
|
switch( attr.c_cflag & CSIZE )
|
|
{
|
|
case CS5:
|
|
cwSetBits( result, kDataBits5Fl);
|
|
break;
|
|
|
|
case CS6:
|
|
cwSetBits( result, kDataBits6Fl );
|
|
break;
|
|
|
|
case CS7:
|
|
cwSetBits( result, kDataBits7Fl);
|
|
break;
|
|
|
|
case CS8:
|
|
cwSetBits( result, kDataBits8Fl);
|
|
break;
|
|
}
|
|
|
|
cwEnaBits( result, k2StopBitFl, cwIsFlag( attr.c_cflag, CSTOPB ));
|
|
cwEnaBits( result, k1StopBitFl, !cwIsFlag( attr.c_cflag, CSTOPB ));
|
|
|
|
if( cwIsFlag( attr.c_cflag, PARENB ) )
|
|
{
|
|
cwEnaBits( result, kOddParityFl, cwIsFlag( attr.c_cflag, PARODD ));
|
|
cwEnaBits( result, kEvenParityFl, !cwIsFlag( attr.c_cflag, PARODD ));
|
|
}
|
|
|
|
return result;
|
|
|
|
}
|
|
|