support/serial.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2
   3 /* serial port functions
   4  *
   5  * Author: Chris Toshok <toshok@ximian.com>
   6  */
   7
   8 #include <termios.h>
   9 #include <unistd.h>
  10 #include <fcntl.h>
  11 #include <string.h>
  12 #include <sys/poll.h>
  13
  14 #include <glib.h>
  15
  16 int
  17 open_serial (char* devfile)
  18 {
  19         int fd;
  20         struct termios newtio;
  21
  22         fd = open (devfile, O_RDWR);
  23
  24         if (fd == -1)
  25                 return -1;
  26
  27         newtio.c_cflag = CLOCAL | CREAD;
  28         newtio.c_iflag = 0;
  29         newtio.c_oflag = 0;
  30         newtio.c_lflag = 0;
  31
  32         tcflush(fd, TCIOFLUSH);
  33         tcsetattr(fd,TCSANOW,&newtio);
  34
  35         fcntl (fd, F_SETFL, O_NONBLOCK);
  36
  37         return fd;
  38 }
  39
  40 void
  41 close_serial (int unix_fd)
  42 {
  43         close (unix_fd);
  44 }
  45
  46 guint32
  47 read_serial (int fd, guchar *buffer, int offset, int count, int timeout)
  48 {
  49         guint32 n;
  50         struct pollfd ufd;
  51
  52         ufd.fd = fd;
  53         ufd.events = POLLHUP | POLLIN | POLLERR;
  54
  55         poll (&ufd, 1, timeout);
  56
  57         if ((ufd.revents & POLLIN) != POLLIN) {
  58                 return -1;
  59         }
  60
  61         n = read (fd, buffer + offset, count);
  62
  63         return (guint32) n;
  64 }
  65
  66 void
  67 write_serial (int fd, guchar *buffer, int offset, int count, int timeout)
  68 {
  69         guint32 n;
  70
  71         struct pollfd ufd;
  72
  73         ufd.fd = fd;
  74         ufd.events = POLLHUP | POLLOUT | POLLERR;
  75
  76         poll (&ufd, 1, timeout);
  77
  78         if ((ufd.revents & POLLOUT) != POLLOUT) {
  79                 return;
  80         }
  81
  82         n = write (fd, buffer + offset, count);
  83 }
  84
  85 void
  86 discard_buffer (int fd, gboolean input)
  87 {
  88         tcflush(fd, input ? TCIFLUSH : TCOFLUSH);
  89 }
  90
  91 gboolean
  92 set_attributes (int fd, int baud_rate, int parity, int dataBits, int stopBits, int handshake)
  93 {
  94         struct termios newtio;
  95
  96         tcgetattr (fd, &newtio);
  97
  98         switch (baud_rate) {
  99         case 230400: baud_rate = B230400; break;
 100         case 115200: baud_rate = B115200; break;
 101         case 57600: baud_rate = B57600; break;
 102         case 38400: baud_rate = B38400; break;
 103         case 19200: baud_rate = B19200; break;
 104         case 9600: baud_rate = B9600; break;
 105         case 4800: baud_rate = B4800; break;
 106         case 2400: baud_rate = B2400; break;
 107         case 1800: baud_rate = B1800; break;
 108         case 1200: baud_rate = B1200; break;
 109         case 600: baud_rate = B600; break;
 110         case 300: baud_rate = B300; break;
 111         case 200: baud_rate = B200; break;
 112         case 150: baud_rate = B150; break;
 113         case 134: baud_rate = B134; break;
 114         case 110: baud_rate = B110; break;
 115         case 75: baud_rate = B75; break;
 116         case 50:
 117         case 0:
 118         default:
 119                 baud_rate = B9600;
 120                 break;
 121         }
 122
 123         switch (parity) {
 124         case 0: /* Even */
 125                 newtio.c_iflag &= ~IGNPAR;
 126                 newtio.c_cflag |= PARENB;
 127                 break;
 128         case 1: /* Mark */
 129                 /* XXX unhandled */
 130                 break;
 131         case 2: /* None */
 132                 newtio.c_iflag |= IGNPAR;
 133                 newtio.c_cflag &= ~(PARENB | PARODD);
 134                 break;
 135         case 3: /* Odd */
 136                 newtio.c_iflag &= ~IGNPAR;
 137                 newtio.c_cflag |= PARENB | PARODD;
 138                 break;
 139         case 4: /* Space */
 140                 /* XXX unhandled */
 141                 break;
 142         }
 143
 144         newtio.c_cflag &= ~CSIZE;
 145         switch (dataBits) {
 146         case 5: newtio.c_cflag |= CS5; break;
 147         case 6: newtio.c_cflag |= CS6; break;
 148         case 7: newtio.c_cflag |= CS7; break;
 149         case 8:
 150         default:
 151                 newtio.c_cflag |= CS8;
 152                 break;
 153         }
 154
 155         newtio.c_cflag &= ~CSTOPB;
 156         switch (stopBits) {
 157         case 0: /* One */
 158                 /* do nothing, the default is one stop bit */
 159                 break;
 160         case 1: /* OnePointFive */
 161                 /* XXX unhandled */
 162                 break;
 163         case 2: /* Two */
 164                 newtio.c_cflag |= CSTOPB;
 165                 break;
 166         }
 167
 168         newtio.c_iflag &= ~IXOFF;
 169         newtio.c_oflag &= ~IXON;
 170 #ifdef CRTSCTS
 171         newtio.c_cflag &= ~CRTSCTS;
 172 #endif /* def CRTSCTS */
 173         switch (handshake) {
 174         case 0: /* None */
 175                 /* do nothing */
 176                 break;
 177         case 1: /* RequestToSend (RTS) */
 178 #ifdef CRTSCTS
 179                 newtio.c_cflag |= CRTSCTS;
 180 #endif /* def CRTSCTS */
 181                 break;
 182         case 2: /* RequestToSendXOnXOff (RTS + XON/XOFF) */
 183 #ifdef CRTSCTS
 184                 newtio.c_cflag |= CRTSCTS;
 185 #endif /* def CRTSCTS */
 186                 /* fall through */
 187         case 3: /* XOnXOff */
 188                 newtio.c_iflag |= IXOFF;
 189                 //              newtio.c_oflag |= IXON;
 190                 break;
 191         }
 192
 193         cfsetospeed (&newtio, baud_rate);
 194         cfsetispeed (&newtio, baud_rate);
 195
 196         tcsetattr(fd,TCSADRAIN,&newtio);
 197
 198         return TRUE;
 199 }
 200
 201 /*
 202  * mono internals should not be used here.
 203  * this serial stuff needs to be implemented with icalls.
 204  * make this at least compile until the code is moved elsewhere
 205  * defined(linux) is wrong, too
 206  */
 207 void*
 208 list_serial_devices (void)
 209 {
 210         return NULL;
 211 }
 212
 213 #if 0
 214 MonoArray *
 215 list_serial_devices (void)
 216 {
 217         MonoArray *array;
 218 #if defined(linux)
 219         /* Linux serial files are of the form ttyS[0-9]+ */
 220         GSList *l, *list = NULL;
 221         GDir* dir = g_dir_open ("/dev", 0, NULL);
 222         const char *filename;
 223         int i = 0;
 224
 225         while ((filename = g_dir_read_name (dir))) {
 226                 if (filename) {
 227                         if (!strncmp (filename, "ttyS", 4))
 228                                 list = g_slist_append (list, g_strconcat ("/dev/", filename, NULL));
 229                 }
 230         }
 231
 232         g_dir_close (dir);
 233
 234         array = mono_array_new (mono_domain_get (), mono_get_string_class (), g_slist_length (list));
 235         for (l = list; l; l = l->next) {
 236                 mono_array_set (array, gpointer, i++, mono_string_new (mono_domain_get (), (char*)l->data));
 237                 g_free (l->data);
 238         }
 239
 240         g_slist_free (list);
 241
 242 #else
 243 #warning "list_serial_devices isn't ported to this OS"
 244 #endif
 245
 246         return array;
 247 }
 248 #endif
 249