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[proxmark3-svn] / client / uart.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.c
30 * @brief
31 *
32 */
33
34 #include "uart.h"
35
36 // Test if we are dealing with unix operating systems
37 #ifndef _WIN32
38
39 #include <termios.h>
40 typedef struct termios term_info;
41 typedef struct {
42 int fd; // Serial port file descriptor
43 term_info tiOld; // Terminal info before using the port
44 term_info tiNew; // Terminal info during the transaction
45 } serial_port_unix;
46
47 // Set time-out on 30 miliseconds
48 const struct timeval timeout = {
49 .tv_sec = 0, // 0 second
50 .tv_usec = 30000 // 30000 micro seconds
51 };
52
53 serial_port uart_open(const char* pcPortName)
54 {
55 serial_port_unix* sp = malloc(sizeof(serial_port_unix));
56 if (sp == 0) return INVALID_SERIAL_PORT;
57
58 sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
59 if(sp->fd == -1) {
60 uart_close(sp);
61 return INVALID_SERIAL_PORT;
62 }
63
64 // Finally figured out a way to claim a serial port interface under unix
65 // We just try to set a (advisory) lock on the file descriptor
66 struct flock fl;
67 fl.l_type = F_WRLCK;
68 fl.l_whence = SEEK_SET;
69 fl.l_start = 0;
70 fl.l_len = 0;
71 fl.l_pid = getpid();
72
73 // Does the system allows us to place a lock on this file descriptor
74 if (fcntl(sp->fd, F_SETLK, &fl) == -1) {
75 // A conflicting lock is held by another process
76 return CLAIMED_SERIAL_PORT;
77 }
78
79 // Try to retrieve the old (current) terminal info struct
80 if(tcgetattr(sp->fd,&sp->tiOld) == -1) {
81 uart_close(sp);
82 return INVALID_SERIAL_PORT;
83 }
84
85 // Duplicate the (old) terminal info struct
86 sp->tiNew = sp->tiOld;
87
88 // Configure the serial port
89 sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD;
90 sp->tiNew.c_iflag = IGNPAR;
91 sp->tiNew.c_oflag = 0;
92 sp->tiNew.c_lflag = 0;
93
94 // Block until n bytes are received
95 sp->tiNew.c_cc[VMIN] = 0;
96 // Block until a timer expires (n * 100 mSec.)
97 sp->tiNew.c_cc[VTIME] = 0;
98
99 // Try to set the new terminal info struct
100 if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1) {
101 uart_close(sp);
102 return INVALID_SERIAL_PORT;
103 }
104
105 // Flush all lingering data that may exist
106 tcflush(sp->fd, TCIOFLUSH);
107
108 return sp;
109 }
110
111 void uart_close(const serial_port sp) {
112 serial_port_unix* spu = (serial_port_unix*)sp;
113 tcflush(spu->fd,TCIOFLUSH);
114 tcsetattr(spu->fd,TCSANOW,&(spu->tiOld));
115 struct flock fl;
116 fl.l_type = F_UNLCK;
117 fl.l_whence = SEEK_SET;
118 fl.l_start = 0;
119 fl.l_len = 0;
120 fl.l_pid = getpid();
121 fcntl(spu->fd, F_SETLK, &fl);
122 close(spu->fd);
123 free(sp);
124 }
125
126 bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
127 const serial_port_unix* spu = (serial_port_unix*)sp;
128 speed_t stPortSpeed;
129 switch (uiPortSpeed) {
130 case 0: stPortSpeed = B0; break;
131 case 50: stPortSpeed = B50; break;
132 case 75: stPortSpeed = B75; break;
133 case 110: stPortSpeed = B110; break;
134 case 134: stPortSpeed = B134; break;
135 case 150: stPortSpeed = B150; break;
136 case 300: stPortSpeed = B300; break;
137 case 600: stPortSpeed = B600; break;
138 case 1200: stPortSpeed = B1200; break;
139 case 1800: stPortSpeed = B1800; break;
140 case 2400: stPortSpeed = B2400; break;
141 case 4800: stPortSpeed = B4800; break;
142 case 9600: stPortSpeed = B9600; break;
143 case 19200: stPortSpeed = B19200; break;
144 case 38400: stPortSpeed = B38400; break;
145 # ifdef B57600
146 case 57600: stPortSpeed = B57600; break;
147 # endif
148 # ifdef B115200
149 case 115200: stPortSpeed = B115200; break;
150 # endif
151 # ifdef B230400
152 case 230400: stPortSpeed = B230400; break;
153 # endif
154 # ifdef B460800
155 case 460800: stPortSpeed = B460800; break;
156 # endif
157 # ifdef B921600
158 case 921600: stPortSpeed = B921600; break;
159 # endif
160 default: return false;
161 };
162 struct termios ti;
163 if (tcgetattr(spu->fd,&ti) == -1) return false;
164 // Set port speed (Input and Output)
165 cfsetispeed(&ti,stPortSpeed);
166 cfsetospeed(&ti,stPortSpeed);
167 return (tcsetattr(spu->fd,TCSANOW,&ti) != -1);
168 }
169
170 uint32_t uart_get_speed(const serial_port sp) {
171 struct termios ti;
172 uint32_t uiPortSpeed;
173 const serial_port_unix* spu = (serial_port_unix*)sp;
174 if (tcgetattr(spu->fd,&ti) == -1) return 0;
175 // Set port speed (Input)
176 speed_t stPortSpeed = cfgetispeed(&ti);
177 switch (stPortSpeed) {
178 case B0: uiPortSpeed = 0; break;
179 case B50: uiPortSpeed = 50; break;
180 case B75: uiPortSpeed = 75; break;
181 case B110: uiPortSpeed = 110; break;
182 case B134: uiPortSpeed = 134; break;
183 case B150: uiPortSpeed = 150; break;
184 case B300: uiPortSpeed = 300; break;
185 case B600: uiPortSpeed = 600; break;
186 case B1200: uiPortSpeed = 1200; break;
187 case B1800: uiPortSpeed = 1800; break;
188 case B2400: uiPortSpeed = 2400; break;
189 case B4800: uiPortSpeed = 4800; break;
190 case B9600: uiPortSpeed = 9600; break;
191 case B19200: uiPortSpeed = 19200; break;
192 case B38400: uiPortSpeed = 38400; break;
193 # ifdef B57600
194 case B57600: uiPortSpeed = 57600; break;
195 # endif
196 # ifdef B115200
197 case B115200: uiPortSpeed = 115200; break;
198 # endif
199 # ifdef B230400
200 case B230400: uiPortSpeed = 230400; break;
201 # endif
202 # ifdef B460800
203 case B460800: uiPortSpeed = 460800; break;
204 # endif
205 # ifdef B921600
206 case B921600: uiPortSpeed = 921600; break;
207 # endif
208 default: return 0;
209 };
210 return uiPortSpeed;
211 }
212
213 bool uart_set_parity(serial_port sp, serial_port_parity spp) {
214 struct termios ti;
215 const serial_port_unix* spu = (serial_port_unix*)sp;
216 if (tcgetattr(spu->fd,&ti) == -1) return false;
217 switch(spp) {
218 case SP_INVALID: return false;
219 case SP_NONE: ti.c_cflag &= ~(PARENB | PARODD); break;
220 case SP_EVEN: ti.c_cflag |= PARENB; ti.c_cflag &= ~(PARODD); break;
221 case SP_ODD: ti.c_cflag |= PARENB | PARODD; break;
222 }
223 return (tcsetattr(spu->fd,TCSANOW,&ti) != -1);
224 }
225
226 serial_port_parity uart_get_parity(const serial_port sp) {
227 struct termios ti;
228 const serial_port_unix* spu = (serial_port_unix*)sp;
229 if (tcgetattr(spu->fd,&ti) == -1) return SP_INVALID;
230
231 if (ti.c_cflag & PARENB) {
232 if (ti.c_cflag & PARODD) {
233 return SP_ODD;
234 } else {
235 return SP_EVEN;
236 }
237 } else {
238 return SP_NONE;
239 }
240 }
241
242 bool uart_cts(const serial_port sp) {
243 char status;
244 if (ioctl(((serial_port_unix*)sp)->fd,TIOCMGET,&status) < 0) return false;
245 return (status & TIOCM_CTS);
246 }
247
248 bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen) {
249
250 int res;
251 int byteCount;
252 fd_set rfds;
253 struct timeval tv;
254
255 // Reset the output count
256 *pszRxLen = 0;
257
258 do {
259 // Reset file descriptor
260 FD_ZERO(&rfds);
261 FD_SET(((serial_port_unix*)sp)->fd,&rfds);
262 tv = timeout;
263 res = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &tv);
264
265 // Read error
266 if (res < 0) {
267 return false;
268 }
269
270 // Read time-out
271 if (res == 0) {
272 if (*pszRxLen == 0) {
273 // Error, we received no data
274 return false;
275 } else {
276 // We received some data, but nothing more is available
277 return true;
278 }
279 }
280
281 // Retrieve the count of the incoming bytes
282 res = ioctl(((serial_port_unix*)sp)->fd, FIONREAD, &byteCount);
283 if (res < 0) return false;
284
285 // There is something available, read the data
286 res = read(((serial_port_unix*)sp)->fd,pbtRx+(*pszRxLen),byteCount);
287
288 // Stop if the OS has some troubles reading the data
289 if (res <= 0) return false;
290
291 *pszRxLen += res;
292
293 if(res==byteCount)
294 return true;
295
296 } while (byteCount);
297
298 return true;
299 }
300
301 bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen) {
302 int32_t res;
303 size_t szPos = 0;
304 fd_set rfds;
305 struct timeval tv;
306
307 while (szPos < szTxLen) {
308 // Reset file descriptor
309 FD_ZERO(&rfds);
310 FD_SET(((serial_port_unix*)sp)->fd,&rfds);
311 tv = timeout;
312 res = select(((serial_port_unix*)sp)->fd+1, NULL, &rfds, NULL, &tv);
313
314 // Write error
315 if (res < 0) {
316 return false;
317 }
318
319 // Write time-out
320 if (res == 0) {
321 return false;
322 }
323
324 // Send away the bytes
325 res = write(((serial_port_unix*)sp)->fd,pbtTx+szPos,szTxLen-szPos);
326
327 // Stop if the OS has some troubles sending the data
328 if (res <= 0) return false;
329
330 szPos += res;
331 }
332 return true;
333 }
334
335 #else
336 // The windows serial port implementation
337
338 typedef struct {
339 HANDLE hPort; // Serial port handle
340 DCB dcb; // Device control settings
341 COMMTIMEOUTS ct; // Serial port time-out configuration
342 } serial_port_windows;
343
344 void upcase(char *p) {
345 while(*p != '\0') {
346 if(*p >= 97 && *p <= 122) {
347 *p -= 32;
348 }
349 ++p;
350 }
351 }
352
353 serial_port uart_open(const char* pcPortName) {
354 char acPortName[255];
355 serial_port_windows* sp = malloc(sizeof(serial_port_windows));
356
357 // Copy the input "com?" to "\\.\COM?" format
358 sprintf(acPortName,"\\\\.\\%s",pcPortName);
359 upcase(acPortName);
360
361 // Try to open the serial port
362 sp->hPort = CreateFileA(acPortName,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
363 if (sp->hPort == INVALID_HANDLE_VALUE) {
364 uart_close(sp);
365 return INVALID_SERIAL_PORT;
366 }
367
368 // Prepare the device control
369 memset(&sp->dcb, 0, sizeof(DCB));
370 sp->dcb.DCBlength = sizeof(DCB);
371 if(!BuildCommDCBA("baud=9600 data=8 parity=N stop=1",&sp->dcb)) {
372 uart_close(sp);
373 return INVALID_SERIAL_PORT;
374 }
375
376 // Update the active serial port
377 if(!SetCommState(sp->hPort,&sp->dcb)) {
378 uart_close(sp);
379 return INVALID_SERIAL_PORT;
380 }
381
382 sp->ct.ReadIntervalTimeout = 0;
383 sp->ct.ReadTotalTimeoutMultiplier = 0;
384 sp->ct.ReadTotalTimeoutConstant = 30;
385 sp->ct.WriteTotalTimeoutMultiplier = 0;
386 sp->ct.WriteTotalTimeoutConstant = 30;
387
388 if(!SetCommTimeouts(sp->hPort,&sp->ct)) {
389 uart_close(sp);
390 return INVALID_SERIAL_PORT;
391 }
392
393 PurgeComm(sp->hPort, PURGE_RXABORT | PURGE_RXCLEAR);
394
395 return sp;
396 }
397
398 void uart_close(const serial_port sp) {
399 CloseHandle(((serial_port_windows*)sp)->hPort);
400 free(sp);
401 }
402
403 bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
404 serial_port_windows* spw;
405 spw = (serial_port_windows*)sp;
406 spw->dcb.BaudRate = uiPortSpeed;
407 return SetCommState(spw->hPort, &spw->dcb);
408 }
409
410 uint32_t uart_get_speed(const serial_port sp) {
411 const serial_port_windows* spw = (serial_port_windows*)sp;
412 if (!GetCommState(spw->hPort, (serial_port)&spw->dcb)) {
413 return spw->dcb.BaudRate;
414 }
415 return 0;
416 }
417
418 bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen) {
419 ReadFile(((serial_port_windows*)sp)->hPort,pbtRx,*pszRxLen,(LPDWORD)pszRxLen,NULL);
420 return (*pszRxLen != 0);
421 }
422
423 bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen) {
424 DWORD dwTxLen = 0;
425 return WriteFile(((serial_port_windows*)sp)->hPort,pbtTx,szTxLen,&dwTxLen,NULL);
426 return (dwTxLen != 0);
427 }
428
429 #endif
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