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win_serialport_impl.c
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win_serialport_impl.c
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/* Ruby/SerialPort
* Guillaume Pierronnet <moumar@netcourrier.com>
* Alan Stern <stern@rowland.harvard.edu>
* Daniel E. Shipton <dshipton@redshiptechnologies.com>
* Hector G. Parra <hector@hectorparra.com>
* Jens Alexander Ewald <jens@ififelse.net>
*
* This code is hereby licensed for public consumption under either the
* GNU GPL v2 or greater.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* For documentation on serial programming, see the excellent:
* "Serial Programming Guide for POSIX Operating Systems"
* written Michael R. Sweet.
* http://www.easysw.com/~mike/serial/
*/
#include "serialport.h"
#if defined(OS_MSWIN) || defined(OS_BCCWIN) || defined(OS_MINGW)
#include <stdio.h> /* Standard input/output definitions */
#include <io.h> /* Low-level I/O definitions */
#include <fcntl.h> /* File control definitions */
#include <windows.h> /* Windows standard function definitions */
static char sGetCommState[] = "GetCommState";
static char sSetCommState[] = "SetCommState";
static char sGetCommTimeouts[] = "GetCommTimeouts";
static char sSetCommTimeouts[] = "SetCommTimeouts";
static HANDLE get_handle_helper(obj)
VALUE obj;
{
#ifdef RUBY_1_9
rb_io_t *fptr;
#else
OpenFile *fptr;
#endif
GetOpenFile(obj, fptr);
#ifdef RUBY_1_9
return (HANDLE) _get_osfhandle(fptr->fd);
#else
return (HANDLE) _get_osfhandle(fileno(fptr->f));
#endif
}
/* hack to work around the fact that Ruby doesn't use GetLastError? */
static void _rb_win32_fail(const char *function_call) {
rb_raise(
rb_eRuntimeError,
"%s failed: GetLastError returns %d",
function_call, GetLastError( )
);
}
VALUE RB_SERIAL_EXPORT sp_create_impl(class, _port)
VALUE class, _port;
{
#ifdef RUBY_1_9
rb_io_t *fp;
#else
OpenFile *fp;
#endif
int fd;
HANDLE fh;
int num_port;
char *str_port;
char port[260]; /* Windows XP MAX_PATH. See http://msdn.microsoft.com/en-us/library/aa365247(VS.85).aspx */
DCB dcb;
NEWOBJ(sp, struct RFile);
rb_secure(4);
OBJSETUP(sp, class, T_FILE);
MakeOpenFile((VALUE) sp, fp);
switch(TYPE(_port))
{
case T_FIXNUM:
num_port = FIX2INT(_port);
if (num_port < 0)
{
rb_raise(rb_eArgError, "illegal port number");
}
snprintf(port, sizeof(port) - 1, "\\\\.\\COM%d", num_port + 1); /* '0' is actually COM1, etc. */
port[sizeof(port) - 1] = 0;
break;
case T_STRING:
Check_SafeStr(_port);
#ifdef RUBY_1_9
str_port = RSTRING_PTR(_port);
#else
str_port = RSTRING(_port)->ptr;
#endif
if (str_port[0] != '\\') /* Check for Win32 Device Namespace prefix "\\.\" */
{
snprintf(port, sizeof(port) - 1, "\\\\.\\%s", str_port);
port[sizeof(port) - 1] = 0;
}
else
{
snprintf(port, sizeof(port) - 1, "%s", str_port);
port[sizeof(port) - 1] = 0;
}
break;
default:
rb_raise(rb_eTypeError, "wrong argument type");
break;
}
fd = open(port, O_BINARY | O_RDWR);
if (fd == -1)
{
rb_sys_fail(port);
}
fh = (HANDLE) _get_osfhandle(fd);
if (SetupComm(fh, 1024, 1024) == 0)
{
close(fd);
rb_raise(rb_eArgError, "not a serial port");
}
dcb.DCBlength = sizeof(dcb);
if (GetCommState(fh, &dcb) == 0)
{
close(fd);
_rb_win32_fail(sGetCommState);
}
dcb.fBinary = TRUE;
dcb.fParity = FALSE;
dcb.fOutxDsrFlow = FALSE;
dcb.fDtrControl = DTR_CONTROL_ENABLE;
dcb.fDsrSensitivity = FALSE;
dcb.fTXContinueOnXoff = FALSE;
dcb.fErrorChar = FALSE;
dcb.fNull = FALSE;
dcb.fAbortOnError = FALSE;
dcb.XonChar = 17;
dcb.XoffChar = 19;
if (SetCommState(fh, &dcb) == 0)
{
close(fd);
_rb_win32_fail(sSetCommState);
}
errno = 0;
fp->mode = FMODE_READWRITE | FMODE_BINMODE | FMODE_SYNC;
#ifdef RUBY_1_9
fp->fd = fd;
#else
fp->f = fdopen(fd, "rb+");
#endif
return (VALUE) sp;
}
VALUE sp_listDevices_impl(class)
VALUE class;
{
// nothing for now
return T_NIL;
}
VALUE RB_SERIAL_EXPORT sp_set_modem_params_impl(argc, argv, self)
int argc;
VALUE *argv, self;
{
HANDLE fh;
DCB dcb;
VALUE _data_rate, _data_bits, _parity, _stop_bits;
int use_hash = 0;
int data_rate, data_bits, parity;
if (argc == 0)
{
return self;
}
if (argc == 1 && T_HASH == TYPE(argv[0]))
{
use_hash = 1;
_data_rate = rb_hash_aref(argv[0], sBaud);
_data_bits = rb_hash_aref(argv[0], sDataBits);
_stop_bits = rb_hash_aref(argv[0], sStopBits);
_parity = rb_hash_aref(argv[0], sParity);
}
fh = get_handle_helper(self);
dcb.DCBlength = sizeof(dcb);
if (GetCommState(fh, &dcb) == 0)
{
_rb_win32_fail(sGetCommState);
}
if (!use_hash)
{
_data_rate = argv[0];
}
if (NIL_P(_data_rate))
{
goto SkipDataRate;
}
Check_Type(_data_rate, T_FIXNUM);
data_rate = FIX2INT(_data_rate);
dcb.BaudRate = data_rate;
SkipDataRate:
if (!use_hash)
{
_data_bits = (argc >= 2 ? argv[1] : INT2FIX(8));
}
if (NIL_P(_data_bits))
{
goto SkipDataBits;
}
Check_Type(_data_bits, T_FIXNUM);
data_bits = FIX2INT(_data_bits);
if (4 <= data_bits && data_bits <= 8)
{
dcb.ByteSize = data_bits;
}
else
{
rb_raise(rb_eArgError, "unknown character size");
}
SkipDataBits:
if (!use_hash)
{
_stop_bits = (argc >= 3 ? argv[2] : INT2FIX(1));
}
if (NIL_P(_stop_bits))
{
goto SkipStopBits;
}
Check_Type(_stop_bits, T_FIXNUM);
switch (FIX2INT(_stop_bits))
{
case 1:
dcb.StopBits = ONESTOPBIT;
break;
case 2:
dcb.StopBits = TWOSTOPBITS;
break;
default:
rb_raise(rb_eArgError, "unknown number of stop bits");
break;
}
SkipStopBits:
if (!use_hash)
{
_parity = (argc >= 4 ? argv[3] : (dcb.ByteSize == 8 ?
INT2FIX(NOPARITY) : INT2FIX(EVENPARITY)));
}
if (NIL_P(_parity))
{
goto SkipParity;
}
Check_Type(_parity, T_FIXNUM);
parity = FIX2INT(_parity);
switch (parity)
{
case EVENPARITY:
case ODDPARITY:
case MARKPARITY:
case SPACEPARITY:
case NOPARITY:
dcb.Parity = parity;
break;
default:
rb_raise(rb_eArgError, "unknown parity");
break;
}
SkipParity:
if (SetCommState(fh, &dcb) == 0)
{
_rb_win32_fail(sSetCommState);
}
return argv[0];
}
void RB_SERIAL_EXPORT get_modem_params_impl(self, mp)
VALUE self;
struct modem_params *mp;
{
HANDLE fh;
DCB dcb;
fh = get_handle_helper(self);
dcb.DCBlength = sizeof(dcb);
if (GetCommState(fh, &dcb) == 0)
{
_rb_win32_fail(sGetCommState);
}
mp->data_rate = dcb.BaudRate;
mp->data_bits = dcb.ByteSize;
mp->stop_bits = (dcb.StopBits == ONESTOPBIT ? 1 : 2);
mp->parity = dcb.Parity;
}
VALUE RB_SERIAL_EXPORT sp_set_flow_control_impl(self, val)
VALUE self, val;
{
HANDLE fh;
int flowc;
DCB dcb;
Check_Type(val, T_FIXNUM);
fh = get_handle_helper(self);
dcb.DCBlength = sizeof(dcb);
if (GetCommState(fh, &dcb) == 0)
{
_rb_win32_fail(sGetCommState);
}
flowc = FIX2INT(val);
if (flowc & HARD)
{
dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
dcb.fOutxCtsFlow = TRUE;
}
else
{
dcb.fRtsControl = RTS_CONTROL_ENABLE;
dcb.fOutxCtsFlow = FALSE;
}
if (flowc & SOFT)
{
dcb.fOutX = dcb.fInX = TRUE;
}
else
{
dcb.fOutX = dcb.fInX = FALSE;
}
if (SetCommState(fh, &dcb) == 0)
{
_rb_win32_fail(sSetCommState);
}
return val;
}
VALUE RB_SERIAL_EXPORT sp_get_flow_control_impl(self)
VALUE self;
{
HANDLE fh;
int ret;
DCB dcb;
fh = get_handle_helper(self);
dcb.DCBlength = sizeof(dcb);
if (GetCommState(fh, &dcb) == 0)
{
_rb_win32_fail(sGetCommState);
}
ret = 0;
if (dcb.fOutxCtsFlow)
{
ret += HARD;
}
if (dcb.fOutX)
{
ret += SOFT;
}
return INT2FIX(ret);
}
VALUE RB_SERIAL_EXPORT sp_set_read_timeout_impl(self, val)
VALUE self, val;
{
int timeout;
HANDLE fh;
COMMTIMEOUTS ctout;
Check_Type(val, T_FIXNUM);
timeout = FIX2INT(val);
fh = get_handle_helper(self);
if (GetCommTimeouts(fh, &ctout) == 0)
{
_rb_win32_fail(sGetCommTimeouts);
}
if (timeout < 0)
{
ctout.ReadIntervalTimeout = MAXDWORD;
ctout.ReadTotalTimeoutMultiplier = 0;
ctout.ReadTotalTimeoutConstant = 0;
}
else if (timeout == 0)
{
ctout.ReadIntervalTimeout = MAXDWORD;
ctout.ReadTotalTimeoutMultiplier = MAXDWORD;
ctout.ReadTotalTimeoutConstant = MAXDWORD - 1;
}
else
{
ctout.ReadIntervalTimeout = timeout;
ctout.ReadTotalTimeoutMultiplier = 0;
ctout.ReadTotalTimeoutConstant = timeout;
}
if (SetCommTimeouts(fh, &ctout) == 0)
{
_rb_win32_fail(sSetCommTimeouts);
}
return val;
}
VALUE RB_SERIAL_EXPORT sp_get_read_timeout_impl(self)
VALUE self;
{
HANDLE fh;
COMMTIMEOUTS ctout;
fh = get_handle_helper(self);
if (GetCommTimeouts(fh, &ctout) == 0)
{
_rb_win32_fail(sGetCommTimeouts);
}
switch (ctout.ReadTotalTimeoutConstant)
{
case 0:
return INT2FIX(-1);
case MAXDWORD:
return INT2FIX(0);
}
return INT2FIX(ctout.ReadTotalTimeoutConstant);
}
VALUE RB_SERIAL_EXPORT sp_set_write_timeout_impl(self, val)
VALUE self, val;
{
int timeout;
HANDLE fh;
COMMTIMEOUTS ctout;
Check_Type(val, T_FIXNUM);
timeout = FIX2INT(val);
fh = get_handle_helper(self);
if (GetCommTimeouts(fh, &ctout) == 0)
{
_rb_win32_fail(sGetCommTimeouts);
}
if (timeout <= 0)
{
ctout.WriteTotalTimeoutMultiplier = 0;
ctout.WriteTotalTimeoutConstant = 0;
}
else
{
ctout.WriteTotalTimeoutMultiplier = timeout;
ctout.WriteTotalTimeoutConstant = 0;
}
if (SetCommTimeouts(fh, &ctout) == 0)
{
_rb_win32_fail(sSetCommTimeouts);
}
return val;
}
VALUE RB_SERIAL_EXPORT sp_get_write_timeout_impl(self)
VALUE self;
{
HANDLE fh;
COMMTIMEOUTS ctout;
fh = get_handle_helper(self);
if (GetCommTimeouts(fh, &ctout) == 0)
{
_rb_win32_fail(sGetCommTimeouts);
}
return INT2FIX(ctout.WriteTotalTimeoutMultiplier);
}
static void delay_ms(time)
int time;
{
HANDLE ev;
ev = CreateEvent(NULL, FALSE, FALSE, NULL);
if (!ev)
{
_rb_win32_fail("CreateEvent");
}
if (WaitForSingleObject(ev, time) == WAIT_FAILED)
{
_rb_win32_fail("WaitForSingleObject");
}
CloseHandle(ev);
}
VALUE RB_SERIAL_EXPORT sp_break_impl(self, time)
VALUE self, time;
{
HANDLE fh;
Check_Type(time, T_FIXNUM);
fh = get_handle_helper(self);
if (SetCommBreak(fh) == 0)
{
_rb_win32_fail("SetCommBreak");
}
delay_ms(FIX2INT(time) * 100);
ClearCommBreak(fh);
return Qnil;
}
void RB_SERIAL_EXPORT get_line_signals_helper_impl(obj, ls)
VALUE obj;
struct line_signals *ls;
{
HANDLE fh;
unsigned long status; /* DWORD */
fh = get_handle_helper(obj);
if (GetCommModemStatus(fh, &status) == 0)
{
_rb_win32_fail("GetCommModemStatus");
}
ls->cts = (status & MS_CTS_ON ? 1 : 0);
ls->dsr = (status & MS_DSR_ON ? 1 : 0);
ls->dcd = (status & MS_RLSD_ON ? 1 : 0);
ls->ri = (status & MS_RING_ON ? 1 : 0);
}
static VALUE set_signal(obj, val, sigoff, sigon)
VALUE obj,val;
int sigoff, sigon;
{
HANDLE fh;
int set, sig;
Check_Type(val, T_FIXNUM);
fh = get_handle_helper(obj);
set = FIX2INT(val);
if (set == 0)
{
sig = sigoff;
}
else if (set == 1)
{
sig = sigon;
}
else
{
rb_raise(rb_eArgError, "invalid value");
}
if (EscapeCommFunction(fh, sig) == 0)
{
_rb_win32_fail("EscapeCommFunction");
}
return val;
}
VALUE RB_SERIAL_EXPORT sp_set_rts_impl(self, val)
VALUE self, val;
{
return set_signal(self, val, CLRRTS, SETRTS);
}
VALUE RB_SERIAL_EXPORT sp_set_dtr_impl(self, val)
VALUE self, val;
{
return set_signal(self, val, CLRDTR, SETDTR);
}
VALUE RB_SERIAL_EXPORT sp_get_rts_impl(self)
VALUE self;
{
rb_notimplement();
return self;
}
VALUE RB_SERIAL_EXPORT sp_get_dtr_impl(self)
VALUE self;
{
rb_notimplement();
return self;
}
#endif /* defined(OS_MSWIN) || defined(OS_BCCWIN) || defined(OS_MINGW) */