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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 free(sp);
77 return CLAIMED_SERIAL_PORT;
78 }
79
80 // Try to retrieve the old (current) terminal info struct
81 if(tcgetattr(sp->fd,&sp->tiOld) == -1) {
82 uart_close(sp);
83 return INVALID_SERIAL_PORT;
84 }
85
86 // Duplicate the (old) terminal info struct
87 sp->tiNew = sp->tiOld;
88
89 // Configure the serial port
90 sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD;
91 sp->tiNew.c_iflag = IGNPAR;
92 sp->tiNew.c_oflag = 0;
93 sp->tiNew.c_lflag = 0;
94
95 // Block until n bytes are received
96 sp->tiNew.c_cc[VMIN] = 0;
97 // Block until a timer expires (n * 100 mSec.)
98 sp->tiNew.c_cc[VTIME] = 0;
99
100 // Try to set the new terminal info struct
101 if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1) {
102 uart_close(sp);
103 return INVALID_SERIAL_PORT;
104 }
105
106 // Flush all lingering data that may exist
107 tcflush(sp->fd, TCIOFLUSH);
108
109 // set speed, works for UBUNTU 14.04
110 bool err = uart_set_speed(sp, 460800);
111 if (!err)
112 uart_set_speed(sp, 115200);
113
114 return sp;
115 }
116
117 void uart_close(const serial_port sp) {
118 serial_port_unix* spu = (serial_port_unix*)sp;
119 tcflush(spu->fd,TCIOFLUSH);
120 tcsetattr(spu->fd,TCSANOW,&(spu->tiOld));
121 struct flock fl;
122 fl.l_type = F_UNLCK;
123 fl.l_whence = SEEK_SET;
124 fl.l_start = 0;
125 fl.l_len = 0;
126 fl.l_pid = getpid();
127
128 // Does the system allows us to place a lock on this file descriptor
129 int err = fcntl(spu->fd, F_SETLK, &fl);
130 if ( err == -1) {
131 //perror("fcntl");
132 }
133 close(spu->fd);
134 free(sp);
135 }
136
137 bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
138 const serial_port_unix* spu = (serial_port_unix*)sp;
139 speed_t stPortSpeed;
140 switch (uiPortSpeed) {
141 case 0: stPortSpeed = B0; break;
142 case 50: stPortSpeed = B50; break;
143 case 75: stPortSpeed = B75; break;
144 case 110: stPortSpeed = B110; break;
145 case 134: stPortSpeed = B134; break;
146 case 150: stPortSpeed = B150; break;
147 case 300: stPortSpeed = B300; break;
148 case 600: stPortSpeed = B600; break;
149 case 1200: stPortSpeed = B1200; break;
150 case 1800: stPortSpeed = B1800; break;
151 case 2400: stPortSpeed = B2400; break;
152 case 4800: stPortSpeed = B4800; break;
153 case 9600: stPortSpeed = B9600; break;
154 case 19200: stPortSpeed = B19200; break;
155 case 38400: stPortSpeed = B38400; break;
156 # ifdef B57600
157 case 57600: stPortSpeed = B57600; break;
158 # endif
159 # ifdef B115200
160 case 115200: stPortSpeed = B115200; break;
161 # endif
162 # ifdef B230400
163 case 230400: stPortSpeed = B230400; break;
164 # endif
165 # ifdef B460800
166 case 460800: stPortSpeed = B460800; break;
167 # endif
168 # ifdef B921600
169 case 921600: stPortSpeed = B921600; break;
170 # endif
171 default: return false;
172 };
173 struct termios ti;
174 if (tcgetattr(spu->fd,&ti) == -1) return false;
175 // Set port speed (Input and Output)
176 cfsetispeed(&ti,stPortSpeed);
177 cfsetospeed(&ti,stPortSpeed);
178 return (tcsetattr(spu->fd,TCSANOW,&ti) != -1);
179 }
180
181 uint32_t uart_get_speed(const serial_port sp) {
182 struct termios ti;
183 uint32_t uiPortSpeed;
184 const serial_port_unix* spu = (serial_port_unix*)sp;
185 if (tcgetattr(spu->fd,&ti) == -1) return 0;
186 // Set port speed (Input)
187 speed_t stPortSpeed = cfgetispeed(&ti);
188 switch (stPortSpeed) {
189 case B0: uiPortSpeed = 0; break;
190 case B50: uiPortSpeed = 50; break;
191 case B75: uiPortSpeed = 75; break;
192 case B110: uiPortSpeed = 110; break;
193 case B134: uiPortSpeed = 134; break;
194 case B150: uiPortSpeed = 150; break;
195 case B300: uiPortSpeed = 300; break;
196 case B600: uiPortSpeed = 600; break;
197 case B1200: uiPortSpeed = 1200; break;
198 case B1800: uiPortSpeed = 1800; break;
199 case B2400: uiPortSpeed = 2400; break;
200 case B4800: uiPortSpeed = 4800; break;
201 case B9600: uiPortSpeed = 9600; break;
202 case B19200: uiPortSpeed = 19200; break;
203 case B38400: uiPortSpeed = 38400; break;
204 # ifdef B57600
205 case B57600: uiPortSpeed = 57600; break;
206 # endif
207 # ifdef B115200
208 case B115200: uiPortSpeed = 115200; break;
209 # endif
210 # ifdef B230400
211 case B230400: uiPortSpeed = 230400; break;
212 # endif
213 # ifdef B460800
214 case B460800: uiPortSpeed = 460800; break;
215 # endif
216 # ifdef B921600
217 case B921600: uiPortSpeed = 921600; break;
218 # endif
219 default: return 0;
220 };
221 return uiPortSpeed;
222 }
223
224 bool uart_set_parity(serial_port sp, serial_port_parity spp) {
225 struct termios ti;
226 const serial_port_unix* spu = (serial_port_unix*)sp;
227 if (tcgetattr(spu->fd,&ti) == -1) return false;
228 switch(spp) {
229 case SP_INVALID: return false;
230 case SP_NONE: ti.c_cflag &= ~(PARENB | PARODD); break;
231 case SP_EVEN: ti.c_cflag |= PARENB; ti.c_cflag &= ~(PARODD); break;
232 case SP_ODD: ti.c_cflag |= PARENB | PARODD; break;
233 }
234 return (tcsetattr(spu->fd,TCSANOW,&ti) != -1);
235 }
236
237 serial_port_parity uart_get_parity(const serial_port sp) {
238 struct termios ti;
239 const serial_port_unix* spu = (serial_port_unix*)sp;
240 if (tcgetattr(spu->fd,&ti) == -1) return SP_INVALID;
241
242 if (ti.c_cflag & PARENB) {
243 if (ti.c_cflag & PARODD) {
244 return SP_ODD;
245 } else {
246 return SP_EVEN;
247 }
248 } else {
249 return SP_NONE;
250 }
251 }
252
253 bool uart_cts(const serial_port sp) {
254 char status;
255 if (ioctl(((serial_port_unix*)sp)->fd,TIOCMGET,&status) < 0) return false;
256 return (status & TIOCM_CTS);
257 }
258
259 bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen) {
260
261 int res;
262 int byteCount;
263 fd_set rfds;
264 struct timeval tv;
265
266 // Reset the output count
267 *pszRxLen = 0;
268
269 do {
270 // Reset file descriptor
271 FD_ZERO(&rfds);
272 FD_SET(((serial_port_unix*)sp)->fd,&rfds);
273 tv = timeout;
274 res = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &tv);
275
276 // Read error
277 if (res < 0) {
278 return false;
279 }
280
281 // Read time-out
282 if (res == 0) {
283 if (*pszRxLen == 0) {
284 // Error, we received no data
285 return false;
286 } else {
287 // We received some data, but nothing more is available
288 return true;
289 }
290 }
291
292 // Retrieve the count of the incoming bytes
293 res = ioctl(((serial_port_unix*)sp)->fd, FIONREAD, &byteCount);
294 if (res < 0) return false;
295
296 // There is something available, read the data
297 res = read(((serial_port_unix*)sp)->fd,pbtRx+(*pszRxLen),byteCount);
298
299 // Stop if the OS has some troubles reading the data
300 if (res <= 0) return false;
301
302 *pszRxLen += res;
303
304 if(res==byteCount)
305 return true;
306
307 } while (byteCount);
308
309 return true;
310 }
311
312 bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen) {
313 int32_t res;
314 size_t szPos = 0;
315 fd_set rfds;
316 struct timeval tv;
317
318 while (szPos < szTxLen) {
319 // Reset file descriptor
320 FD_ZERO(&rfds);
321 FD_SET(((serial_port_unix*)sp)->fd,&rfds);
322 tv = timeout;
323 res = select(((serial_port_unix*)sp)->fd+1, NULL, &rfds, NULL, &tv);
324
325 // Write error
326 if (res < 0) {
327 printf("write error\n");
328 return false;
329 }
330
331 // Write time-out
332 if (res == 0) {
333 printf("write time-out\n");
334 return false;
335 }
336
337 // Send away the bytes
338 res = write(((serial_port_unix*)sp)->fd,pbtTx+szPos,szTxLen-szPos);
339
340 // Stop if the OS has some troubles sending the data
341 if (res <= 0) {
342 printf("os troubles\n");
343 return false;
344 }
345
346 szPos += res;
347 }
348 return true;
349 }
350
351 #else
352 // The windows serial port implementation
353
354 typedef struct {
355 HANDLE hPort; // Serial port handle
356 DCB dcb; // Device control settings
357 COMMTIMEOUTS ct; // Serial port time-out configuration
358 } serial_port_windows;
359
360 void upcase(char *p) {
361 while(*p != '\0') {
362 if(*p >= 97 && *p <= 122) {
363 *p -= 32;
364 }
365 ++p;
366 }
367 }
368
369 serial_port uart_open(const char* pcPortName) {
370 char acPortName[255];
371 serial_port_windows* sp = malloc(sizeof(serial_port_windows));
372
373 // Copy the input "com?" to "\\.\COM?" format
374 sprintf(acPortName,"\\\\.\\%s",pcPortName);
375 upcase(acPortName);
376
377 // Try to open the serial port
378 sp->hPort = CreateFileA(acPortName,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
379 if (sp->hPort == INVALID_HANDLE_VALUE) {
380 uart_close(sp);
381 return INVALID_SERIAL_PORT;
382 }
383
384 // Prepare the device control
385 memset(&sp->dcb, 0, sizeof(DCB));
386 sp->dcb.DCBlength = sizeof(DCB);
387 if(!BuildCommDCBA("baud=115200 parity=N data=8 stop=1",&sp->dcb)) {
388 uart_close(sp);
389 return INVALID_SERIAL_PORT;
390 }
391
392 // Update the active serial port
393 if(!SetCommState(sp->hPort,&sp->dcb)) {
394 uart_close(sp);
395 return INVALID_SERIAL_PORT;
396 }
397 // all zero's configure: no timeout for read/write used.
398 sp->ct.ReadIntervalTimeout = 0;//1;
399 sp->ct.ReadTotalTimeoutMultiplier = 0;//1;
400 sp->ct.ReadTotalTimeoutConstant = 30;
401 sp->ct.WriteTotalTimeoutMultiplier = 0;//1;
402 sp->ct.WriteTotalTimeoutConstant = 30;
403
404 if(!SetCommTimeouts(sp->hPort,&sp->ct)) {
405 uart_close(sp);
406 return INVALID_SERIAL_PORT;
407 }
408
409 PurgeComm(sp->hPort, PURGE_RXABORT | PURGE_RXCLEAR);
410
411 bool err = uart_set_speed(sp, 460800);
412 if (!err)
413 uart_set_speed(sp, 115200);
414
415 return sp;
416 }
417
418 void uart_close(const serial_port sp) {
419 CloseHandle(((serial_port_windows*)sp)->hPort);
420 free(sp);
421 }
422
423 bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
424 serial_port_windows* spw;
425 spw = (serial_port_windows*)sp;
426 spw->dcb.BaudRate = uiPortSpeed;
427 return SetCommState(spw->hPort, &spw->dcb);
428 }
429
430 uint32_t uart_get_speed(const serial_port sp) {
431 const serial_port_windows* spw = (serial_port_windows*)sp;
432 if (!GetCommState(spw->hPort, (serial_port)&spw->dcb)) {
433 return spw->dcb.BaudRate;
434 }
435 return 0;
436 }
437
438 bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen) {
439 ReadFile(((serial_port_windows*)sp)->hPort,pbtRx,*pszRxLen,(LPDWORD)pszRxLen,NULL);
440 return (*pszRxLen != 0);
441 }
442
443 bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen) {
444 DWORD dwTxLen = 0;
445 return WriteFile(((serial_port_windows*)sp)->hPort, pbtTx, szTxLen, &dwTxLen, NULL);
446 return (dwTxLen != 0);
447 }
448
449 #endif
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