git.zerfleddert.de Git - proxmark3-svn/blob - uart/uart_posix.c

   1 /*
   2  * Generic uart / rs232/ serial port library
   3  *
   4  * Copyright (c) 2013, Roel Verdult
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the copyright holders nor the
  15  * names of its contributors may be used to endorse or promote products
  16  * derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * @file uart_posix.c
  30  *
  31  * This version of the library has functionality removed which was not used by
  32  * proxmark3 project.
  33  */
  34
  35 #include "uart.h"
  36
  37 // Test if we are dealing with posix operating systems
  38 #ifndef _WIN32
  39 #include <termios.h>
  40 #include <sys/ioctl.h>
  41 #include <unistd.h>
  42 #include <fcntl.h>
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45 #include <limits.h>
  46 #include <sys/time.h>
  47 #include <errno.h>
  48
  49 typedef struct termios term_info;
  50 typedef struct {
  51   int fd;           // Serial port file descriptor
  52   term_info tiOld;  // Terminal info before using the port
  53   term_info tiNew;  // Terminal info during the transaction
  54 } serial_port_unix;
  55
  56 // Set time-out on 30 miliseconds
  57 const struct timeval timeout = {
  58   .tv_sec  =     0, // 0 second
  59   .tv_usec = 30000  // 30000 micro seconds
  60 };
  61
  62 serial_port uart_open(const char* pcPortName)
  63 {
  64   serial_port_unix* sp = malloc(sizeof(serial_port_unix));
  65   if (sp == 0) return INVALID_SERIAL_PORT;
  66
  67   sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
  68   if(sp->fd == -1) {
  69     uart_close(sp);
  70     return INVALID_SERIAL_PORT;
  71   }
  72
  73   // Finally figured out a way to claim a serial port interface under unix
  74   // We just try to set a (advisory) lock on the file descriptor
  75   struct flock fl;
  76   fl.l_type   = F_WRLCK;
  77   fl.l_whence = SEEK_SET;
  78   fl.l_start  = 0;
  79   fl.l_len    = 0;
  80   fl.l_pid    = getpid();
  81
  82   // Does the system allows us to place a lock on this file descriptor
  83   if (fcntl(sp->fd, F_SETLK, &fl) == -1) {
  84     // A conflicting lock is held by another process
  85     free(sp);
  86     return CLAIMED_SERIAL_PORT;
  87   }
  88
  89   // Try to retrieve the old (current) terminal info struct
  90   if(tcgetattr(sp->fd,&sp->tiOld) == -1) {
  91     uart_close(sp);
  92     return INVALID_SERIAL_PORT;
  93   }
  94
  95   // Duplicate the (old) terminal info struct
  96   sp->tiNew = sp->tiOld;
  97
  98   // Configure the serial port
  99   sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD;
 100   sp->tiNew.c_iflag = IGNPAR;
 101   sp->tiNew.c_oflag = 0;
 102   sp->tiNew.c_lflag = 0;
 103
 104   // Block until n bytes are received
 105   sp->tiNew.c_cc[VMIN] = 0;
 106   // Block until a timer expires (n * 100 mSec.)
 107   sp->tiNew.c_cc[VTIME] = 0;
 108
 109   // Try to set the new terminal info struct
 110   if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1) {
 111     uart_close(sp);
 112     return INVALID_SERIAL_PORT;
 113   }
 114
 115   // Flush all lingering data that may exist
 116   tcflush(sp->fd, TCIOFLUSH);
 117
 118   return sp;
 119 }
 120
 121 void uart_close(const serial_port sp) {
 122   serial_port_unix* spu = (serial_port_unix*)sp;
 123   tcflush(spu->fd,TCIOFLUSH);
 124   tcsetattr(spu->fd,TCSANOW,&(spu->tiOld));
 125   struct flock fl;
 126   fl.l_type   = F_UNLCK;
 127   fl.l_whence = SEEK_SET;
 128   fl.l_start  = 0;
 129   fl.l_len    = 0;
 130   fl.l_pid    = getpid();
 131   fcntl(spu->fd, F_SETLK, &fl);
 132   close(spu->fd);
 133   free(sp);
 134 }
 135
 136 bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t pszMaxRxLen, size_t* pszRxLen) {
 137   int res;
 138   int byteCount;
 139   fd_set rfds;
 140   struct timeval tv;
 141
 142   // Reset the output count
 143   *pszRxLen = 0;
 144
 145   do {
 146     // Reset file descriptor
 147     FD_ZERO(&rfds);
 148     FD_SET(((serial_port_unix*)sp)->fd,&rfds);
 149     tv = timeout;
 150     res = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &tv);
 151
 152     // Read error
 153     if (res < 0) {
 154       return false;
 155     }
 156
 157     // Read time-out
 158     if (res == 0) {
 159       if (*pszRxLen == 0) {
 160         // Error, we received no data
 161         return false;
 162       } else {
 163         // We received some data, but nothing more is available
 164         return true;
 165       }
 166     }
 167
 168     // Retrieve the count of the incoming bytes
 169     res = ioctl(((serial_port_unix*)sp)->fd, FIONREAD, &byteCount);
 170     if (res < 0) return false;
 171
 172     // Cap the number of bytes, so we don't overrun the buffer
 173     if (pszMaxRxLen - (*pszRxLen) < byteCount) {
 174         byteCount = pszMaxRxLen - (*pszRxLen);
 175     }
 176
 177     // There is something available, read the data
 178     res = read(((serial_port_unix*)sp)->fd, pbtRx+(*pszRxLen), byteCount);
 179
 180     // Stop if the OS has some troubles reading the data
 181     if (res <= 0) return false;
 182
 183     *pszRxLen += res;
 184
 185     if (*pszRxLen == pszMaxRxLen) {
 186         // We have all the data we wanted.
 187       return true;
 188     }
 189
 190   } while (byteCount);
 191
 192   return true;
 193 }
 194
 195 bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen) {
 196   int32_t res;
 197   size_t szPos = 0;
 198   fd_set rfds;
 199   struct timeval tv;
 200
 201   while (szPos < szTxLen) {
 202     // Reset file descriptor
 203     FD_ZERO(&rfds);
 204     FD_SET(((serial_port_unix*)sp)->fd,&rfds);
 205     tv = timeout;
 206     res = select(((serial_port_unix*)sp)->fd+1, NULL, &rfds, NULL, &tv);
 207
 208     // Write error
 209     if (res < 0) {
 210       return false;
 211     }
 212
 213     // Write time-out
 214     if (res == 0) {
 215       return false;
 216     }
 217
 218     // Send away the bytes
 219     res = write(((serial_port_unix*)sp)->fd,pbtTx+szPos,szTxLen-szPos);
 220
 221     // Stop if the OS has some troubles sending the data
 222     if (res <= 0) return false;
 223
 224     szPos += res;
 225   }
 226   return true;
 227 }
 228
 229 bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
 230   const serial_port_unix* spu = (serial_port_unix*)sp;
 231   speed_t stPortSpeed;
 232   switch (uiPortSpeed) {
 233     case 0: stPortSpeed = B0; break;
 234     case 50: stPortSpeed = B50; break;
 235     case 75: stPortSpeed = B75; break;
 236     case 110: stPortSpeed = B110; break;
 237     case 134: stPortSpeed = B134; break;
 238     case 150: stPortSpeed = B150; break;
 239     case 300: stPortSpeed = B300; break;
 240     case 600: stPortSpeed = B600; break;
 241     case 1200: stPortSpeed = B1200; break;
 242     case 1800: stPortSpeed = B1800; break;
 243     case 2400: stPortSpeed = B2400; break;
 244     case 4800: stPortSpeed = B4800; break;
 245     case 9600: stPortSpeed = B9600; break;
 246     case 19200: stPortSpeed = B19200; break;
 247     case 38400: stPortSpeed = B38400; break;
 248 #  ifdef B57600
 249     case 57600: stPortSpeed = B57600; break;
 250 #  endif
 251 #  ifdef B115200
 252     case 115200: stPortSpeed = B115200; break;
 253 #  endif
 254 #  ifdef B230400
 255     case 230400: stPortSpeed = B230400; break;
 256 #  endif
 257 #  ifdef B460800
 258     case 460800: stPortSpeed = B460800; break;
 259 #  endif
 260 #  ifdef B921600
 261     case 921600: stPortSpeed = B921600; break;
 262 #  endif
 263     default: return false;
 264   };
 265   struct termios ti;
 266   if (tcgetattr(spu->fd,&ti) == -1) return false;
 267   // Set port speed (Input and Output)
 268   cfsetispeed(&ti,stPortSpeed);
 269   cfsetospeed(&ti,stPortSpeed);
 270   return (tcsetattr(spu->fd,TCSANOW,&ti) != -1);
 271 }
 272
 273 uint32_t uart_get_speed(const serial_port sp) {
 274   struct termios ti;
 275   uint32_t uiPortSpeed;
 276   const serial_port_unix* spu = (serial_port_unix*)sp;
 277   if (tcgetattr(spu->fd,&ti) == -1) return 0;
 278   // Set port speed (Input)
 279   speed_t stPortSpeed = cfgetispeed(&ti);
 280   switch (stPortSpeed) {
 281     case B0: uiPortSpeed = 0; break;
 282     case B50: uiPortSpeed = 50; break;
 283     case B75: uiPortSpeed = 75; break;
 284     case B110: uiPortSpeed = 110; break;
 285     case B134: uiPortSpeed = 134; break;
 286     case B150: uiPortSpeed = 150; break;
 287     case B300: uiPortSpeed = 300; break;
 288     case B600: uiPortSpeed = 600; break;
 289     case B1200: uiPortSpeed = 1200; break;
 290     case B1800: uiPortSpeed = 1800; break;
 291     case B2400: uiPortSpeed = 2400; break;
 292     case B4800: uiPortSpeed = 4800; break;
 293     case B9600: uiPortSpeed = 9600; break;
 294     case B19200: uiPortSpeed = 19200; break;
 295     case B38400: uiPortSpeed = 38400; break;
 296 #  ifdef B57600
 297     case B57600: uiPortSpeed = 57600; break;
 298 #  endif
 299 #  ifdef B115200
 300     case B115200: uiPortSpeed = 115200; break;
 301 #  endif
 302 #  ifdef B230400
 303     case B230400: uiPortSpeed = 230400; break;
 304 #  endif
 305 #  ifdef B460800
 306     case B460800: uiPortSpeed = 460800; break;
 307 #  endif
 308 #  ifdef B921600
 309     case B921600: uiPortSpeed = 921600; break;
 310 #  endif
 311     default: return 0;
 312   };
 313   return uiPortSpeed;
 314 }
 315
 316 #endif
 317