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sim_serial.c
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/* sim_serial.c: OS-dependent serial port routines
Copyright (c) 2008, J. David Bryan
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of the author shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the author.
The author gratefully acknowledges the assistance of Holger Veit with the
UNIX-specific code and testing.
07-Oct-08 JDB [serial] Created file
This module provides OS-dependent routines to access serial ports on the host
machine. The terminal multiplexer library uses these routines to provide
serial connections to simulated terminal interfaces.
Currently, the module supports Windows and UNIX. Use on other systems
returns error codes indicating that the functions failed, inhibiting serial
port support in SIMH.
The following routines are provided:
sim_open_serial open a serial port
sim_config_serial change baud rate and character framing configuration
sim_control_serial manipulate and/or return the modem bits on a serial port
sim_read_serial read from a serial port
sim_write_serial write to a serial port
sim_close_serial close a serial port
sim_show_serial shows the available host serial ports
The calling sequences are as follows:
SERHANDLE sim_open_serial (char *name)
--------------------------------------
The serial port referenced by the OS-dependent "name" is opened. If the open
is successful, and "name" refers to a serial port on the host system, then a
handle to the port is returned. If not, then the value INVALID_HANDLE is
returned.
t_stat sim_config_serial (SERHANDLE port, const char *config)
-------------------------------------------------------------
The baud rate and framing parameters (character size, parity, and number of
stop bits) of the serial port associated with "port" are set. If any
"config" field value is unsupported by the host system, or if the combination
of values (e.g., baud rate and number of stop bits) is unsupported, SCPE_ARG
is returned. If the configuration is successful, SCPE_OK is returned.
sim_control_serial (SERHANDLE port, int32 bits_to_set, int32 bits_to_clear, int32 *incoming_bits)
-------------------------------------------------------------------------------------------------
The DTR and RTS line of the serial port is set or cleared as indicated in
the respective bits_to_set or bits_to_clear parameters. If the
incoming_bits parameter is not NULL, then the modem status bits DCD, RNG,
DSR and CTS are returned.
If unreasonable or nonsense bits_to_set or bits_to_clear bits are
specified, then the return status is SCPE_ARG;
If an error occurs, SCPE_IOERR is returned.
int32 sim_read_serial (SERHANDLE port, char *buffer, int32 count, char *brk)
----------------------------------------------------------------------------
A non-blocking read is issued for the serial port indicated by "port" to get
at most "count" bytes into the string "buffer". If a serial line break was
detected during the read, the variable pointed to by "brk" is set to 1. If
the read is successful, the actual number of characters read is returned. If
no characters were available, then the value 0 is returned. If an error
occurs, then the value -1 is returned.
int32 sim_write_serial (SERHANDLE port, char *buffer, int32 count)
------------------------------------------------------------------
A write is issued to the serial port indicated by "port" to put "count"
characters from "buffer". If the write is successful, the actual number of
characters written is returned. If an error occurs, then the value -1 is
returned.
void sim_close_serial (SERHANDLE port)
--------------------------------------
The serial port indicated by "port" is closed.
int sim_serial_devices (int max, SERIAL_LIST* list)
---------------------------------------------------
enumerates the available host serial ports
t_stat sim_show_serial (FILE* st, DEVICE *dptr, UNIT* uptr, int32 val, void* desc)
---------------------------------
displays the available host serial ports
*/
#include "sim_defs.h"
#include "sim_serial.h"
#include "sim_tmxr.h"
#include <ctype.h>
#define SER_DEV_NAME_MAX 256 /* maximum device name size */
#define SER_DEV_DESC_MAX 256 /* maximum device description size */
#define SER_DEV_CONFIG_MAX 64 /* maximum device config size */
#define SER_MAX_DEVICE 64 /* maximum serial devices */
typedef struct serial_list {
char name[SER_DEV_NAME_MAX];
char desc[SER_DEV_DESC_MAX];
} SERIAL_LIST;
typedef struct serial_config { /* serial port configuration */
uint32 baudrate; /* baud rate */
uint32 charsize; /* character size in bits */
char parity; /* parity (N/O/E/M/S) */
uint32 stopbits; /* 0/1/2 stop bits (0 implies 1.5) */
} SERCONFIG;
static int sim_serial_os_devices (int max, SERIAL_LIST* list);
static SERHANDLE sim_open_os_serial (char *name);
static void sim_close_os_serial (SERHANDLE port);
static t_stat sim_config_os_serial (SERHANDLE port, SERCONFIG config);
static struct open_serial_device {
SERHANDLE port;
TMLN *line;
char name[SER_DEV_NAME_MAX];
char config[SER_DEV_CONFIG_MAX];
} *serial_open_devices = NULL;
static int serial_open_device_count = 0;
static struct open_serial_device *_get_open_device (SERHANDLE port)
{
int i;
for (i=0; i<serial_open_device_count; ++i)
if (serial_open_devices[i].port == port)
return &serial_open_devices[i];
return NULL;
}
static struct open_serial_device *_get_open_device_byname (const char *name)
{
int i;
for (i=0; i<serial_open_device_count; ++i)
if (0 == strcmp(name, serial_open_devices[i].name))
return &serial_open_devices[i];
return NULL;
}
static struct open_serial_device *_serial_add_to_open_list (SERHANDLE port, TMLN *line, const char *name, const char *config)
{
serial_open_devices = (struct open_serial_device *)realloc(serial_open_devices, (++serial_open_device_count)*sizeof(*serial_open_devices));
memset(&serial_open_devices[serial_open_device_count-1], 0, sizeof(serial_open_devices[serial_open_device_count-1]));
serial_open_devices[serial_open_device_count-1].port = port;
serial_open_devices[serial_open_device_count-1].line = line;
strncpy(serial_open_devices[serial_open_device_count-1].name, name, sizeof(serial_open_devices[serial_open_device_count-1].name)-1);
if (config)
strncpy(serial_open_devices[serial_open_device_count-1].config, config, sizeof(serial_open_devices[serial_open_device_count-1].config));
return &serial_open_devices[serial_open_device_count-1];
}
static void _serial_remove_from_open_list (SERHANDLE port)
{
int i, j;
for (i=0; i<serial_open_device_count; ++i)
if (serial_open_devices[i].port == port) {
for (j=i+1; j<serial_open_device_count; ++j)
serial_open_devices[j-1] = serial_open_devices[j];
--serial_open_device_count;
break;
}
}
/* Generic error message handler.
This routine should be called for unexpected errors. Some error returns may
be expected, e.g., a "file not found" error from an "open" routine. These
should return appropriate status codes to the caller, allowing SCP to print
an error message if desired, rather than printing this generic error message.
*/
static void sim_error_serial (char *routine, int error)
{
fprintf (stderr, "Serial: %s fails with error %d\n", routine, error);
if (sim_deb)
fprintf (sim_deb, "Serial: %s fails with error %d\n", routine, error);
return;
}
/* Used when sorting a list of serial port names */
static int _serial_name_compare (const void *pa, const void *pb)
{
SERIAL_LIST *a = (SERIAL_LIST *)pa;
SERIAL_LIST *b = (SERIAL_LIST *)pb;
return strcmp(a->name, b->name);
}
static int sim_serial_devices (int max, SERIAL_LIST *list)
{
int i, j, ports = sim_serial_os_devices(max, list);
/* Open ports may not show up in the list returned by sim_serial_os_devices
so we add the open ports to the list removing duplicates before sorting
the resulting list */
for (i=0; i<serial_open_device_count; ++i) {
for (j=0; j<ports; ++j)
if (0 == strcmp(serial_open_devices[i].name, list[j].name))
break;
if (j<ports)
continue;
if (ports >= max)
break;
strcpy(list[ports].name, serial_open_devices[i].name);
strcpy(list[ports].desc, serial_open_devices[i].config);
++ports;
}
if (ports) /* Order the list returned alphabetically by the port name */
qsort (list, ports, sizeof(list[0]), _serial_name_compare);
return ports;
}
static char* sim_serial_getname (int number, char* name)
{
SERIAL_LIST list[SER_MAX_DEVICE];
int count = sim_serial_devices(SER_MAX_DEVICE, list);
if (count <= number)
return NULL;
strcpy(name, list[number].name);
return name;
}
static char* sim_serial_getname_bydesc (char* desc, char* name)
{
SERIAL_LIST list[SER_MAX_DEVICE];
int count = sim_serial_devices(SER_MAX_DEVICE, list);
int i;
size_t j=strlen(desc);
for (i=0; i<count; i++) {
int found = 1;
size_t k = strlen(list[i].desc);
if (j != k)
continue;
for (k=0; k<j; k++)
if (tolower(list[i].desc[k]) != tolower(desc[k]))
found = 0;
if (found == 0)
continue;
/* found a case-insensitive description match */
strcpy(name, list[i].name);
return name;
}
/* not found */
return NULL;
}
/* strncasecmp() is not available on all platforms */
static int sim_serial_strncasecmp (char* string1, char* string2, size_t len)
{
size_t i;
unsigned char s1, s2;
for (i=0; i<len; i++) {
s1 = string1[i];
s2 = string2[i];
if (islower (s1))
s1 = toupper (s1);
if (islower (s2))
s2 = toupper (s2);
if (s1 < s2)
return -1;
if (s1 > s2)
return 1;
if (s1 == 0)
return 0;
}
return 0;
}
static char* sim_serial_getname_byname (char* name, char* temp)
{
SERIAL_LIST list[SER_MAX_DEVICE];
int count = sim_serial_devices(SER_MAX_DEVICE, list);
size_t n;
int i, found;
found = 0;
n = strlen(name);
for (i=0; i<count && !found; i++) {
if ((n == strlen(list[i].name)) &&
(sim_serial_strncasecmp(name, list[i].name, n) == 0)) {
found = 1;
strcpy(temp, list[i].name); /* only case might be different */
}
}
return (found ? temp : NULL);
}
char* sim_serial_getdesc_byname (char* name, char* temp)
{
SERIAL_LIST list[SER_MAX_DEVICE];
int count = sim_serial_devices(SER_MAX_DEVICE, list);
size_t n;
int i, found;
found = 0;
n = strlen(name);
for (i=0; i<count && !found; i++) {
if ((n == strlen(list[i].name)) &&
(sim_serial_strncasecmp(name, list[i].name, n) == 0)) {
found = 1;
strcpy(temp, list[i].desc);
}
}
return (found ? temp : NULL);
}
t_stat sim_show_serial (FILE* st, DEVICE *dptr, UNIT* uptr, int32 val, char* desc)
{
SERIAL_LIST list[SER_MAX_DEVICE];
int number = sim_serial_devices(SER_MAX_DEVICE, list);
fprintf(st, "Serial devices:\n");
if (number == -1)
fprintf(st, " serial support not available in simulator\n");
else
if (number == 0)
fprintf(st, " no serial devices are available\n");
else {
size_t min, len;
int i;
for (i=0, min=0; i<number; i++)
if ((len = strlen(list[i].name)) > min)
min = len;
for (i=0; i<number; i++)
fprintf(st," ser%d\t%-*s%s%s%s\n", i, (int)min, list[i].name, list[i].desc[0] ? " (" : "", list[i].desc, list[i].desc[0] ? ")" : "");
}
if (serial_open_device_count) {
int i;
char desc[SER_DEV_DESC_MAX], *d;
fprintf(st,"Open Serial Devices:\n");
for (i=0; i<serial_open_device_count; i++) {
d = sim_serial_getdesc_byname(serial_open_devices[i].name, desc);
fprintf(st, " %s\tLn%02d %s%s%s%s\tConfig: %s\n", serial_open_devices[i].line->mp->dptr->name, (int)(serial_open_devices[i].line->mp->ldsc-serial_open_devices[i].line),
serial_open_devices[i].line->destination, d ? " {" : "", d ? d : "", d ? ")" : "", serial_open_devices[i].line->serconfig);
}
}
return SCPE_OK;
}
SERHANDLE sim_open_serial (char *name, TMLN *lp, t_stat *stat)
{
char temp1[1024], devname [1024];
char *savname = name;
SERHANDLE port = INVALID_HANDLE;
char *config;
t_stat status;
config = get_glyph_nc (name, devname, ';'); /* separate port name from optional config params */
if ((config == NULL) || (*config == '\0'))
config = "9600-8N1";
if (stat)
*stat = SCPE_OK;
/* translate name of type "serX" to real device name */
if ((strlen(devname) <= 5)
&& (tolower(devname[0]) == 's')
&& (tolower(devname[1]) == 'e')
&& (tolower(devname[2]) == 'r')
&& (isdigit(devname[3]))
&& (isdigit(devname[4]) || (devname[4] == '\0'))
) {
int num = atoi(&devname[3]);
savname = sim_serial_getname(num, temp1);
if (savname == NULL) { /* didn't translate */
if (stat)
*stat = SCPE_OPENERR;
return port;
}
}
else {
/* are they trying to use device description? */
savname = sim_serial_getname_bydesc(devname, temp1);
if (savname == NULL) { /* didn't translate */
/* probably is not serX and has no description */
savname = sim_serial_getname_byname(devname, temp1);
if (savname == NULL) /* didn't translate */
savname = devname;
}
}
if (_get_open_device_byname (savname)) {
if (stat)
*stat = SCPE_OPENERR;
return INVALID_HANDLE;
}
port = sim_open_os_serial (savname);
if (port == INVALID_HANDLE) {
if (stat)
*stat = SCPE_OPENERR;
return port;
}
status = sim_config_serial (port, config); /* set serial configuration */
if (status != SCPE_OK) { /* port configuration error? */
sim_close_serial (port); /* close the port */
if (stat)
*stat = status;
port = INVALID_HANDLE; /* report error */
}
if ((port != INVALID_HANDLE) && (*config) && (lp)) {
lp->serconfig = (char *)realloc (lp->serconfig, 1 + strlen (config));
strcpy (lp->serconfig, config);
}
if (port != INVALID_HANDLE)
_serial_add_to_open_list (port, lp, savname, config);
return port;
}
void sim_close_serial (SERHANDLE port)
{
sim_close_os_serial (port);
_serial_remove_from_open_list (port);
}
t_stat sim_config_serial (SERHANDLE port, const char *sconfig)
{
const char *pptr;
char *sptr, *tptr;
SERCONFIG config = { 0 };
t_bool arg_error = FALSE;
t_stat r;
struct open_serial_device *dev;
if ((sconfig == NULL) || (*sconfig == '\0'))
sconfig = "9600-8N1"; /* default settings */
pptr = sconfig;
config.baudrate = (uint32)strtotv (pptr, &sptr, 10); /* parse baud rate */
arg_error = (pptr == sptr); /* check for bad argument */
if (*sptr) /* separator present? */
sptr++; /* skip it */
config.charsize = (uint32)strtotv (sptr, &tptr, 10); /* parse character size */
arg_error = arg_error || (sptr == tptr); /* check for bad argument */
if (*tptr) /* parity character present? */
config.parity = toupper (*tptr++); /* save parity character */
config.stopbits = (uint32)strtotv (tptr, &sptr, 10); /* parse number of stop bits */
arg_error = arg_error || (tptr == sptr); /* check for bad argument */
if (arg_error) /* bad conversions? */
return SCPE_ARG; /* report argument error */
if (strcmp (sptr, ".5") == 0) /* 1.5 stop bits requested? */
config.stopbits = 0; /* code request */
r = sim_config_os_serial (port, config);
dev = _get_open_device (port);
if (dev) {
dev->line->serconfig = (char *)realloc (dev->line->serconfig, 1 + strlen (sconfig));
strcpy (dev->line->serconfig, sconfig);
}
return r;
}
#if defined (_WIN32)
/* Windows serial implementation */
/* Enumerate the available serial ports.
The serial port names are extracted from the appropriate place in the
windows registry (HKLM\HARDWARE\DEVICEMAP\SERIALCOMM\). The resulting
list is sorted alphabetically by device name (COMn). The device description
is set to the OS internal name for the COM device.
*/
static int sim_serial_os_devices (int max, SERIAL_LIST* list)
{
int ports = 0;
HKEY hSERIALCOMM;
memset(list, 0, max*sizeof(*list));
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, "HARDWARE\\DEVICEMAP\\SERIALCOMM", 0, KEY_QUERY_VALUE, &hSERIALCOMM) == ERROR_SUCCESS) {
DWORD dwIndex = 0;
DWORD dwType;
DWORD dwValueNameSize = sizeof(list[ports].desc);
DWORD dwDataSize = sizeof(list[ports].name);
/* Enumerate all the values underneath HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM */
while (RegEnumValueA(hSERIALCOMM, dwIndex, list[ports].desc, &dwValueNameSize, NULL, &dwType, (BYTE *)list[ports].name, &dwDataSize) == ERROR_SUCCESS) {
/* String values with non-zero size are the interesting ones */
if ((dwType == REG_SZ) && (dwDataSize > 0)) {
if (ports < max)
++ports;
else
break;
}
/* Besure to clear the working entry before trying again */
memset(list[ports].name, 0, sizeof(list[ports].name));
memset(list[ports].desc, 0, sizeof(list[ports].desc));
dwValueNameSize = sizeof(list[ports].desc);
dwDataSize = sizeof(list[ports].name);
++dwIndex;
}
RegCloseKey(hSERIALCOMM);
}
return ports;
}
/* Open a serial port.
The serial port designated by "name" is opened, and the handle to the port is
returned. If an error occurs, INVALID_HANDLE is returned instead. After
opening, the port is configured with the default communication parameters
established by the system, and the timeouts are set for immediate return on a
read request to enable polling.
Implementation notes:
1. We call "GetDefaultCommConfig" to obtain the default communication
parameters for the specified port. If the name does not refer to a
communications port (serial or parallel), the function fails.
2. There is no way to limit "CreateFile" just to serial ports, so we must
check after the port is opened. The "GetCommState" routine will return
an error if the handle does not refer to a serial port.
3. Calling "GetDefaultCommConfig" for a serial port returns a structure
containing a DCB. This contains the default parameters. However, some
of the DCB fields are not set correctly, so we cannot use this directly
in a call to "SetCommState". Instead, we must copy the fields of
interest to a DCB retrieved from a call to "GetCommState".
*/
static SERHANDLE sim_open_os_serial (char *name)
{
SERHANDLE port;
DCB dcb;
COMMCONFIG commdefault;
DWORD error;
DWORD commsize = sizeof (commdefault);
COMMTIMEOUTS cto;
if (!GetDefaultCommConfig (name, &commdefault, &commsize)) { /* get default comm parameters */
error = GetLastError (); /* function failed; get error */
if (error != ERROR_INVALID_PARAMETER) /* not a communications port name? */
sim_error_serial ("GetDefaultCommConfig", (int) error); /* no, so report unexpected error */
return INVALID_HANDLE; /* indicate bad port name */
}
port = CreateFile (name, GENERIC_READ | GENERIC_WRITE, /* open the port */
0, NULL, OPEN_EXISTING, 0, 0);
if (port == INVALID_HANDLE_VALUE) { /* open failed? */
error = GetLastError (); /* get error code */
if ((error != ERROR_FILE_NOT_FOUND) && /* bad filename? */
(error != ERROR_ACCESS_DENIED)) /* already open? */
sim_error_serial ("CreateFile", (int) error); /* no, so report unexpected error */
return INVALID_HANDLE; /* indicate bad port name */
}
if (!GetCommState (port, &dcb)) { /* get the current comm parameters */
error = GetLastError (); /* function failed; get error */
if (error != ERROR_INVALID_PARAMETER) /* not a serial port name? */
sim_error_serial ("GetCommState", (int) error); /* no, so report unexpected error */
CloseHandle (port); /* close the port */
return INVALID_HANDLE; /* and indicate bad port name */
}
dcb.BaudRate = commdefault.dcb.BaudRate; /* copy default parameters of interest */
dcb.Parity = commdefault.dcb.Parity;
dcb.ByteSize = commdefault.dcb.ByteSize;
dcb.StopBits = commdefault.dcb.StopBits;
dcb.fOutX = commdefault.dcb.fOutX;
dcb.fInX = commdefault.dcb.fInX;
dcb.fDtrControl = DTR_CONTROL_DISABLE; /* disable DTR initially until poll connects */
if (!SetCommState (port, &dcb)) { /* configure the port with default parameters */
sim_error_serial ("SetCommState", /* function failed; report unexpected error */
(int) GetLastError ());
CloseHandle (port); /* close port */
return INVALID_HANDLE; /* and indicate failure to caller */
}
cto.ReadIntervalTimeout = MAXDWORD; /* set port to return immediately on read */
cto.ReadTotalTimeoutMultiplier = 0; /* i.e., to enable polling */
cto.ReadTotalTimeoutConstant = 0;
cto.WriteTotalTimeoutMultiplier = 0;
cto.WriteTotalTimeoutConstant = 0;
if (!SetCommTimeouts (port, &cto)) { /* configure port timeouts */
sim_error_serial ("SetCommTimeouts", /* function failed; report unexpected error */
(int) GetLastError ());
CloseHandle (port); /* close port */
return INVALID_HANDLE; /* and indicate failure to caller */
}
return port; /* return port handle on success */
}
/* Configure a serial port.
Port parameters are configured as specified in the "config" structure. If
"config" contains an invalid configuration value, or if the host system
rejects the configuration (e.g., by requesting an unsupported combination of
character size and stop bits), SCPE_ARG is returned to the caller. If an
unexpected error occurs, SCPE_IOERR is returned. If the configuration
succeeds, SCPE_OK is returned.
Implementation notes:
1. We do not enable input parity checking, as the multiplexer library has no
way of communicating parity errors back to the target simulator.
2. A zero value for the "stopbits" field of the "config" structure implies
1.5 stop bits.
*/
static t_stat sim_config_os_serial (SERHANDLE port, SERCONFIG config)
{
static const struct {
char parity;
BYTE parity_code;
} parity_map [] =
{ { 'E', EVENPARITY }, { 'M', MARKPARITY }, { 'N', NOPARITY },
{ 'O', ODDPARITY }, { 'S', SPACEPARITY } };
static const int32 parity_count = sizeof (parity_map) / sizeof (parity_map [0]);
DCB dcb;
DWORD error;
int32 i;
if (!GetCommState (port, &dcb)) { /* get the current comm parameters */
sim_error_serial ("GetCommState", /* function failed; report unexpected error */
(int) GetLastError ());
return SCPE_IOERR; /* return failure status */
}
dcb.BaudRate = config.baudrate; /* assign baud rate */
if (config.charsize >= 5 && config.charsize <= 8) /* character size OK? */
dcb.ByteSize = config.charsize; /* assign character size */
else
return SCPE_ARG; /* not a valid size */
for (i = 0; i < parity_count; i++) /* assign parity */
if (config.parity == parity_map [i].parity) { /* match mapping value? */
dcb.Parity = parity_map [i].parity_code; /* assign corresponding code */
break;
}
if (i == parity_count) /* parity assigned? */
return SCPE_ARG; /* not a valid parity specifier */
if (config.stopbits == 1) /* assign stop bits */
dcb.StopBits = ONESTOPBIT;
else if (config.stopbits == 2)
dcb.StopBits = TWOSTOPBITS;
else if (config.stopbits == 0) /* 0 implies 1.5 stop bits */
dcb.StopBits = ONE5STOPBITS;
else
return SCPE_ARG; /* not a valid number of stop bits */
if (!SetCommState (port, &dcb)) { /* set the configuration */
error = GetLastError (); /* check for error */
if (error == ERROR_INVALID_PARAMETER) /* invalid configuration? */
return SCPE_ARG; /* report as argument error */
sim_error_serial ("SetCommState", (int) error); /* function failed; report unexpected error */
return SCPE_IOERR; /* return failure status */
}
return SCPE_OK; /* return success status */
}
/* Control a serial port.
The DTR and RTS line of the serial port is set or cleared as indicated in
the respective bits_to_set or bits_to_clear parameters. If the
incoming_bits parameter is not NULL, then the modem status bits DCD, RNG,
DSR and CTS are returned.
If unreasonable or nonsense bits_to_set or bits_to_clear bits are
specified, then the return status is SCPE_ARG;
If an error occurs, SCPE_IOERR is returned.
*/
t_stat sim_control_serial (SERHANDLE port, int32 bits_to_set, int32 bits_to_clear, int32 *incoming_bits)
{
if ((bits_to_set & ~(TMXR_MDM_OUTGOING)) || /* Assure only settable bits */
(bits_to_clear & ~(TMXR_MDM_OUTGOING)) ||
(bits_to_set & bits_to_clear)) /* and can't set and clear the same bits */
return SCPE_ARG;
if (bits_to_set&TMXR_MDM_DTR)
if (!EscapeCommFunction (port, SETDTR)) {
sim_error_serial ("EscapeCommFunction", (int) GetLastError ());
return SCPE_IOERR;
}
if (bits_to_clear&TMXR_MDM_DTR)
if (!EscapeCommFunction (port, CLRDTR)) {
sim_error_serial ("EscapeCommFunction", (int) GetLastError ());
return SCPE_IOERR;
}
if (bits_to_set&TMXR_MDM_RTS)
if (!EscapeCommFunction (port, SETRTS)) {
sim_error_serial ("EscapeCommFunction", (int) GetLastError ());
return SCPE_IOERR;
}
if (bits_to_clear&TMXR_MDM_RTS)
if (!EscapeCommFunction (port, CLRRTS)) {
sim_error_serial ("EscapeCommFunction", (int) GetLastError ());
return SCPE_IOERR;
}
if (incoming_bits) {
DWORD ModemStat;
if (GetCommModemStatus (port, &ModemStat)) {
sim_error_serial ("GetCommModemStatus", (int) GetLastError ());
return SCPE_IOERR;
}
*incoming_bits = ((ModemStat&MS_CTS_ON) ? TMXR_MDM_CTS : 0) |
((ModemStat&MS_DSR_ON) ? TMXR_MDM_DSR : 0) |
((ModemStat&MS_RING_ON) ? TMXR_MDM_RNG : 0) |
((ModemStat&MS_RLSD_ON) ? TMXR_MDM_DCD : 0);
}
return SCPE_OK;
}
/* Read from a serial port.
The port is checked for available characters. If any are present, they are
copied to the passed buffer, and the count of characters is returned. If no
characters are available, 0 is returned. If an error occurs, -1 is returned.
If a BREAK is detected on the communications line, the corresponding flag in
the "brk" array is set.
Implementation notes:
1. The "ClearCommError" function will set the CE_BREAK flag in the returned
errors value if a BREAK has occurred. However, we do not know where in
the serial stream it happened, as CE_BREAK isn't associated with a
specific character. Because the "brk" array does want a flag associated
with a specific character, we guess at the proper location by setting
the "brk" entry corresponding to the first NUL in the character stream.
If no NUL is present, then the "brk" entry associated with the first
character is set.
*/
int32 sim_read_serial (SERHANDLE port, char *buffer, int32 count, char *brk)
{
DWORD read;
DWORD commerrors;
COMSTAT cs;
char *bptr;
if (!ClearCommError (port, &commerrors, &cs)) { /* get the comm error flags */
sim_error_serial ("ClearCommError", /* function failed; report unexpected error */
(int) GetLastError ());
return -1; /* return failure to caller */
}
if (!ReadFile (port, (LPVOID) buffer, /* read any available characters */
(DWORD) count, &read, NULL)) {
sim_error_serial ("ReadFile", /* function failed; report unexpected error */
(int) GetLastError ());
return -1; /* return failure to caller */
}
if (commerrors & CE_BREAK) { /* was a BREAK detected? */
bptr = (char *) memchr (buffer, 0, read); /* search for the first NUL in the buffer */
if (bptr) /* was one found? */
brk = brk + (bptr - buffer); /* calculate corresponding position */
*brk = 1; /* set the BREAK flag */
}
return read; /* return the number of characters read */
}
/* Write to a serial port.
"Count" characters are written from "buffer" to the serial port. The actual
number of characters written to the port is returned. If an error occurred
on writing, -1 is returned.
*/
int32 sim_write_serial (SERHANDLE port, char *buffer, int32 count)
{
DWORD written;
if (!WriteFile (port, (LPVOID) buffer, /* write the buffer to the serial port */
(DWORD) count, &written, NULL)) {
sim_error_serial ("WriteFile", /* function failed; report unexpected error */
(int) GetLastError ());
return -1; /* return failure to caller */
}
else
return written; /* return number of characters written */
}
/* Close a serial port.
The serial port is closed. Errors are ignored.
*/
static void sim_close_os_serial (SERHANDLE port)
{
CloseHandle (port); /* close the port */
return;
}
#elif defined (__unix__) || defined(__APPLE__) || defined(__hpux)
#if defined(__linux) || defined(__linux__)
#include <dirent.h>
#include <libgen.h>
#include <unistd.h>
#include <sys/stat.h>
#endif /* __linux__ */
/* UNIX implementation */
/* Enumerate the available serial ports.
The serial port names generated by attempting to open /dev/ttyS0 thru
/dev/ttyS63 and /dev/ttyUSB0 thru /dev/ttyUSB63 and /dev/tty.serial0
thru /dev/tty.serial63. Ones we can open and are ttys (as determined
by isatty()) are added to the list. The list is sorted alphabetically
by device name.
*/
static int sim_serial_os_devices (int max, SERIAL_LIST* list)
{
int i;
int port;
int ports = 0;
memset(list, 0, max*sizeof(*list));
#if defined(__linux) || defined(__linux__)
if (1) {
struct dirent **namelist;
struct stat st;
i = scandir("/sys/class/tty/", &namelist, NULL, NULL);
while (i--) {
if (strcmp(namelist[i]->d_name, ".") &&
strcmp(namelist[i]->d_name, "..")) {
char path[1024], devicepath[1024], driverpath[1024];
sprintf (path, "/sys/class/tty/%s", namelist[i]->d_name);
sprintf (devicepath, "/sys/class/tty/%s/device", namelist[i]->d_name);
sprintf (driverpath, "/sys/class/tty/%s/device/driver", namelist[i]->d_name);
if ((lstat(devicepath, &st) == 0) && S_ISLNK(st.st_mode)) {
char buffer[1024];
memset (buffer, 0, sizeof(buffer));
if (readlink(driverpath, buffer, sizeof(buffer)) > 0) {
sprintf (list[ports].name, "/dev/%s", basename (path));
port = open (list[ports].name, O_RDWR | O_NOCTTY | O_NONBLOCK); /* open the port */
if (port != -1) { /* open OK? */
if (isatty (port)) /* is device a TTY? */
++ports;
close (port);
}
}
}
}
free (namelist[i]);
}
free (namelist);
}
#elif defined(__hpux)
for (i=0; (ports < max) && (i < 64); ++i) {
sprintf (list[ports].name, "/dev/tty%dp%d", i/8, i%8);
port = open (list[ports].name, O_RDWR | O_NOCTTY | O_NONBLOCK); /* open the port */
if (port != -1) { /* open OK? */
if (isatty (port)) /* is device a TTY? */
++ports;
close (port);
}
}
#else /* Non Linux/HP-UX, just try some well known device names */
for (i=0; (ports < max) && (i < 64); ++i) {
sprintf (list[ports].name, "/dev/ttyS%d", i);
port = open (list[ports].name, O_RDWR | O_NOCTTY | O_NONBLOCK); /* open the port */
if (port != -1) { /* open OK? */
if (isatty (port)) /* is device a TTY? */
++ports;
close (port);
}
}
for (i=0; (ports < max) && (i < 64); ++i) {
sprintf (list[ports].name, "/dev/ttyUSB%d", i);
port = open (list[ports].name, O_RDWR | O_NOCTTY | O_NONBLOCK); /* open the port */
if (port != -1) { /* open OK? */
if (isatty (port)) /* is device a TTY? */
++ports;
close (port);
}
}
for (i=1; (ports < max) && (i < 64); ++i) {
sprintf (list[ports].name, "/dev/tty.serial%d", i);
port = open (list[ports].name, O_RDWR | O_NOCTTY | O_NONBLOCK); /* open the port */
if (port != -1) { /* open OK? */
if (isatty (port)) /* is device a TTY? */
++ports;
close (port);
}
}
#endif
return ports;
}
/* Open a serial port.
The serial port designated by "name" is opened, and the handle to the port is
returned. If an error occurs, INVALID_HANDLE is returned instead. After
opening, the port is configured to "raw" mode.
Implementation notes:
1. We use a non-blocking open to allow for polling during reads.
2. There is no way to limit "open" just to serial ports, so we must check
after the port is opened. We do this with a combination of "isatty" and
"tcgetattr".
3. We configure with PARMRK set and IGNBRK and BRKINT cleared. This will
mark a communication line BREAK condition in the input stream with the
three-character sequence \377 \000 \000. This is detected during
reading.