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5bcc76c4 1/*
13dbdd6b 2 * Generic uart / rs232/ serial port library
5bcc76c4 3 *
13dbdd6b 4 * Copyright (c) 2013, Roel Verdult
5bcc76c4 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 *
5bcc76c4 32 */
33
34#include "uart.h"
5bcc76c4 35
36// Test if we are dealing with unix operating systems
37#ifndef _WIN32
38
39#include <termios.h>
40typedef struct termios term_info;
41typedef 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
13dbdd6b 48const struct timeval timeout = {
5bcc76c4 49 .tv_sec = 0, // 0 second
50 .tv_usec = 30000 // 30000 micro seconds
51};
52
5bcc76c4 53serial_port uart_open(const char* pcPortName)
54{
55 serial_port_unix* sp = malloc(sizeof(serial_port_unix));
5bcc76c4 56 if (sp == 0) return INVALID_SERIAL_PORT;
13dbdd6b 57
5bcc76c4 58 sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
62ee4fed 59 if(sp->fd == -1) {
5bcc76c4 60 uart_close(sp);
61 return INVALID_SERIAL_PORT;
62 }
62ee4fed 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();
13dbdd6b 72
62ee4fed 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;
5bcc76c4 77 }
62ee4fed 78
79 // Try to retrieve the old (current) terminal info struct
80 if(tcgetattr(sp->fd,&sp->tiOld) == -1) {
5bcc76c4 81 uart_close(sp);
62ee4fed 82 return INVALID_SERIAL_PORT;
5bcc76c4 83 }
13dbdd6b 84
62ee4fed 85 // Duplicate the (old) terminal info struct
5bcc76c4 86 sp->tiNew = sp->tiOld;
13dbdd6b 87
62ee4fed 88 // Configure the serial port
5bcc76c4 89 sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD;
62ee4fed 90 sp->tiNew.c_iflag = IGNPAR;
5bcc76c4 91 sp->tiNew.c_oflag = 0;
92 sp->tiNew.c_lflag = 0;
62ee4fed 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;
0a24369c 98
62ee4fed 99 // Try to set the new terminal info struct
100 if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1) {
5bcc76c4 101 uart_close(sp);
102 return INVALID_SERIAL_PORT;
103 }
13dbdd6b 104
62ee4fed 105 // Flush all lingering data that may exist
0a24369c 106 tcflush(sp->fd, TCIOFLUSH);
62ee4fed 107
5bcc76c4 108 return sp;
109}
110
62ee4fed 111void 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
13dbdd6b 126bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
5bcc76c4 127 const serial_port_unix* spu = (serial_port_unix*)sp;
62ee4fed 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);
5bcc76c4 168}
169
13dbdd6b 170uint32_t uart_get_speed(const serial_port sp) {
62ee4fed 171 struct termios ti;
172 uint32_t uiPortSpeed;
5bcc76c4 173 const serial_port_unix* spu = (serial_port_unix*)sp;
62ee4fed 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 };
5bcc76c4 210 return uiPortSpeed;
211}
212
62ee4fed 213bool 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
226serial_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 }
5bcc76c4 240}
241
13dbdd6b 242bool uart_cts(const serial_port sp) {
5bcc76c4 243 char status;
244 if (ioctl(((serial_port_unix*)sp)->fd,TIOCMGET,&status) < 0) return false;
245 return (status & TIOCM_CTS);
246}
247
13dbdd6b 248bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen) {
62ee4fed 249
5bcc76c4 250 int res;
251 int byteCount;
252 fd_set rfds;
253 struct timeval tv;
13dbdd6b 254
255 // Reset the output count
5bcc76c4 256 *pszRxLen = 0;
13dbdd6b 257
5bcc76c4 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);
13dbdd6b 264
5bcc76c4 265 // Read error
266 if (res < 0) {
5bcc76c4 267 return false;
268 }
13dbdd6b 269
5bcc76c4 270 // Read time-out
271 if (res == 0) {
272 if (*pszRxLen == 0) {
273 // Error, we received no data
5bcc76c4 274 return false;
275 } else {
276 // We received some data, but nothing more is available
277 return true;
278 }
279 }
13dbdd6b 280
5bcc76c4 281 // Retrieve the count of the incoming bytes
282 res = ioctl(((serial_port_unix*)sp)->fd, FIONREAD, &byteCount);
283 if (res < 0) return false;
13dbdd6b 284
5bcc76c4 285 // There is something available, read the data
286 res = read(((serial_port_unix*)sp)->fd,pbtRx+(*pszRxLen),byteCount);
13dbdd6b 287
5bcc76c4 288 // Stop if the OS has some troubles reading the data
289 if (res <= 0) return false;
13dbdd6b 290
5bcc76c4 291 *pszRxLen += res;
13dbdd6b 292
5bcc76c4 293 } while (byteCount);
13dbdd6b 294
5bcc76c4 295 return true;
296}
297
13dbdd6b 298bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen) {
5bcc76c4 299 int32_t res;
300 size_t szPos = 0;
301 fd_set rfds;
302 struct timeval tv;
13dbdd6b 303
62ee4fed 304 while (szPos < szTxLen) {
5bcc76c4 305 // Reset file descriptor
306 FD_ZERO(&rfds);
307 FD_SET(((serial_port_unix*)sp)->fd,&rfds);
308 tv = timeout;
309 res = select(((serial_port_unix*)sp)->fd+1, NULL, &rfds, NULL, &tv);
13dbdd6b 310
5bcc76c4 311 // Write error
312 if (res < 0) {
5bcc76c4 313 return false;
314 }
13dbdd6b 315
5bcc76c4 316 // Write time-out
317 if (res == 0) {
5bcc76c4 318 return false;
319 }
13dbdd6b 320
5bcc76c4 321 // Send away the bytes
322 res = write(((serial_port_unix*)sp)->fd,pbtTx+szPos,szTxLen-szPos);
323
324 // Stop if the OS has some troubles sending the data
325 if (res <= 0) return false;
13dbdd6b 326
5bcc76c4 327 szPos += res;
328 }
329 return true;
330}
331
332#else
333// The windows serial port implementation
334
13dbdd6b 335typedef struct {
5bcc76c4 336 HANDLE hPort; // Serial port handle
337 DCB dcb; // Device control settings
338 COMMTIMEOUTS ct; // Serial port time-out configuration
339} serial_port_windows;
340
a0bbdb76 341void upcase(char *p) {
62ee4fed 342 while(*p != '\0') {
343 if(*p >= 97 && *p <= 122) {
344 *p -= 32;
a0bbdb76 345 }
62ee4fed 346 ++p;
347 }
a0bbdb76 348}
349
13dbdd6b 350serial_port uart_open(const char* pcPortName) {
5bcc76c4 351 char acPortName[255];
352 serial_port_windows* sp = malloc(sizeof(serial_port_windows));
13dbdd6b 353
5bcc76c4 354 // Copy the input "com?" to "\\.\COM?" format
355 sprintf(acPortName,"\\\\.\\%s",pcPortName);
a0bbdb76 356 upcase(acPortName);
13dbdd6b 357
5bcc76c4 358 // Try to open the serial port
359 sp->hPort = CreateFileA(acPortName,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
62ee4fed 360 if (sp->hPort == INVALID_HANDLE_VALUE) {
5bcc76c4 361 uart_close(sp);
362 return INVALID_SERIAL_PORT;
363 }
13dbdd6b 364
5bcc76c4 365 // Prepare the device control
366 memset(&sp->dcb, 0, sizeof(DCB));
367 sp->dcb.DCBlength = sizeof(DCB);
62ee4fed 368 if(!BuildCommDCBA("baud=9600 data=8 parity=N stop=1",&sp->dcb)) {
5bcc76c4 369 uart_close(sp);
370 return INVALID_SERIAL_PORT;
371 }
13dbdd6b 372
5bcc76c4 373 // Update the active serial port
62ee4fed 374 if(!SetCommState(sp->hPort,&sp->dcb)) {
5bcc76c4 375 uart_close(sp);
376 return INVALID_SERIAL_PORT;
377 }
13dbdd6b 378
5bcc76c4 379 sp->ct.ReadIntervalTimeout = 0;
380 sp->ct.ReadTotalTimeoutMultiplier = 0;
381 sp->ct.ReadTotalTimeoutConstant = 30;
382 sp->ct.WriteTotalTimeoutMultiplier = 0;
383 sp->ct.WriteTotalTimeoutConstant = 30;
13dbdd6b 384
62ee4fed 385 if(!SetCommTimeouts(sp->hPort,&sp->ct)) {
5bcc76c4 386 uart_close(sp);
387 return INVALID_SERIAL_PORT;
388 }
13dbdd6b 389
5bcc76c4 390 PurgeComm(sp->hPort, PURGE_RXABORT | PURGE_RXCLEAR);
13dbdd6b 391
5bcc76c4 392 return sp;
393}
394
13dbdd6b 395void uart_close(const serial_port sp) {
5bcc76c4 396 CloseHandle(((serial_port_windows*)sp)->hPort);
397 free(sp);
398}
399
13dbdd6b 400bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
5bcc76c4 401 serial_port_windows* spw;
5bcc76c4 402 spw = (serial_port_windows*)sp;
403 spw->dcb.BaudRate = uiPortSpeed;
13dbdd6b 404 return SetCommState(spw->hPort, &spw->dcb);
5bcc76c4 405}
406
13dbdd6b 407uint32_t uart_get_speed(const serial_port sp) {
5bcc76c4 408 const serial_port_windows* spw = (serial_port_windows*)sp;
13dbdd6b 409 if (!GetCommState(spw->hPort, (serial_port)&spw->dcb)) {
5bcc76c4 410 return spw->dcb.BaudRate;
13dbdd6b 411 }
5bcc76c4 412 return 0;
413}
414
13dbdd6b 415bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen) {
5bcc76c4 416 ReadFile(((serial_port_windows*)sp)->hPort,pbtRx,*pszRxLen,(LPDWORD)pszRxLen,NULL);
417 return (*pszRxLen != 0);
418}
419
13dbdd6b 420bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen) {
5bcc76c4 421 DWORD dwTxLen = 0;
422 return WriteFile(((serial_port_windows*)sp)->hPort,pbtTx,szTxLen,&dwTxLen,NULL);
423 return (dwTxLen != 0);
424}
425
426#endif
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