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1 | /* | |
2 | * This file is part of the libserialport project. | |
3 | * | |
4 | * Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU Lesser General Public License as | |
8 | * published by the Free Software Foundation, either version 3 of the | |
9 | * License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | /** | |
21 | * @mainpage libserialport API | |
22 | * | |
23 | * Introduction | |
24 | * ============ | |
25 | * | |
26 | * libserialport is a minimal library written in C that is intended to take | |
27 | * care of the OS-specific details when writing software that uses serial ports. | |
28 | * | |
29 | * By writing your serial code to use libserialport, you enable it to work | |
30 | * transparently on any platform supported by the library. | |
31 | * | |
32 | * The operations that are supported are: | |
33 | * | |
34 | * - @ref Enumeration (obtaining a list of serial ports on the system) | |
35 | * - @ref Ports | |
36 | * - @ref Configuration (baud rate, parity, etc.) | |
37 | * - @ref Signals (modem control lines, breaks, etc.) | |
38 | * - @ref Data | |
39 | * - @ref Errors | |
40 | * | |
41 | * libserialport is an open source project released under the LGPL3+ license. | |
42 | * | |
43 | * API principles | |
44 | * ============== | |
45 | * | |
46 | * The API is simple, and designed to be a minimal wrapper around the serial | |
47 | * port support in each OS. | |
48 | * | |
49 | * Most functions take a pointer to a struct sp_port, which represents a serial | |
50 | * port. These structures are always allocated and freed by the library, using | |
51 | * the functions in the @ref Enumeration "Enumeration" section. | |
52 | * | |
53 | * Most functions have return type @ref sp_return and can return only four | |
54 | * possible error values: | |
55 | * | |
56 | * - @ref SP_ERR_ARG means that a function was called with invalid | |
57 | * arguments. This implies a bug in the caller. The arguments passed would | |
58 | * be invalid regardless of the underlying OS or serial device involved. | |
59 | * | |
60 | * - @ref SP_ERR_FAIL means that the OS reported a failure. The error code or | |
61 | * message provided by the OS can be obtained by calling sp_last_error_code() | |
62 | * or sp_last_error_message(). | |
63 | * | |
64 | * - @ref SP_ERR_SUPP indicates that there is no support for the requested | |
65 | * operation in the current OS, driver or device. No error message is | |
66 | * available from the OS in this case. There is either no way to request | |
67 | * the operation in the first place, or libserialport does not know how to | |
68 | * do so in the current version. | |
69 | * | |
70 | * - @ref SP_ERR_MEM indicates that a memory allocation failed. | |
71 | * | |
72 | * All of these error values are negative. | |
73 | * | |
74 | * Calls that succeed return @ref SP_OK, which is equal to zero. Some functions | |
75 | * declared @ref sp_return can also return a positive value for a successful | |
76 | * numeric result, e.g. sp_read() and sp_write(). | |
77 | */ | |
78 | ||
79 | #ifndef LIBSERIALPORT_LIBSERIALPORT_H | |
80 | #define LIBSERIALPORT_LIBSERIALPORT_H | |
81 | ||
82 | #ifdef __cplusplus | |
83 | extern "C" { | |
84 | #endif | |
85 | ||
86 | #include <stddef.h> | |
87 | #ifdef _WIN32 | |
88 | #include <windows.h> | |
89 | #endif | |
90 | ||
91 | /* Package version macros (e.g. for conditional compilation). */ | |
92 | #define SP_PACKAGE_VERSION_MAJOR @SP_PACKAGE_VERSION_MAJOR@ | |
93 | #define SP_PACKAGE_VERSION_MINOR @SP_PACKAGE_VERSION_MINOR@ | |
94 | #define SP_PACKAGE_VERSION_MICRO @SP_PACKAGE_VERSION_MICRO@ | |
95 | #define SP_PACKAGE_VERSION_STRING "@SP_PACKAGE_VERSION@" | |
96 | ||
97 | /* Library/libtool version macros (e.g. for conditional compilation). */ | |
98 | #define SP_LIB_VERSION_CURRENT @SP_LIB_VERSION_CURRENT@ | |
99 | #define SP_LIB_VERSION_REVISION @SP_LIB_VERSION_REVISION@ | |
100 | #define SP_LIB_VERSION_AGE @SP_LIB_VERSION_AGE@ | |
101 | #define SP_LIB_VERSION_STRING "@SP_LIB_VERSION@" | |
102 | ||
103 | /** Return values. */ | |
104 | enum sp_return { | |
105 | /** Operation completed successfully. */ | |
106 | SP_OK = 0, | |
107 | /** Invalid arguments were passed to the function. */ | |
108 | SP_ERR_ARG = -1, | |
109 | /** A system error occured while executing the operation. */ | |
110 | SP_ERR_FAIL = -2, | |
111 | /** A memory allocation failed while executing the operation. */ | |
112 | SP_ERR_MEM = -3, | |
113 | /** The requested operation is not supported by this system or device. */ | |
114 | SP_ERR_SUPP = -4, | |
115 | }; | |
116 | ||
117 | /** Port access modes. */ | |
118 | enum sp_mode { | |
119 | /** Open port for read access. */ | |
120 | SP_MODE_READ = 1, | |
121 | /** Open port for write access. */ | |
122 | SP_MODE_WRITE = 2, | |
123 | }; | |
124 | ||
125 | /** Buffer selection. */ | |
126 | enum sp_buffer { | |
127 | /** Input buffer. */ | |
128 | SP_BUF_INPUT = 1, | |
129 | /** Output buffer. */ | |
130 | SP_BUF_OUTPUT = 2, | |
131 | /** Both buffers. */ | |
132 | SP_BUF_BOTH = 3, | |
133 | }; | |
134 | ||
135 | /** Parity settings. */ | |
136 | enum sp_parity { | |
137 | /** Special value to indicate setting should be left alone. */ | |
138 | SP_PARITY_INVALID = -1, | |
139 | /** No parity. */ | |
140 | SP_PARITY_NONE = 0, | |
141 | /** Odd parity. */ | |
142 | SP_PARITY_ODD = 1, | |
143 | /** Even parity. */ | |
144 | SP_PARITY_EVEN = 2, | |
145 | /** Mark parity. */ | |
146 | SP_PARITY_MARK = 3, | |
147 | /** Space parity. */ | |
148 | SP_PARITY_SPACE = 4, | |
149 | }; | |
150 | ||
151 | /** RTS pin behaviour. */ | |
152 | enum sp_rts { | |
153 | /** Special value to indicate setting should be left alone. */ | |
154 | SP_RTS_INVALID = -1, | |
155 | /** RTS off. */ | |
156 | SP_RTS_OFF = 0, | |
157 | /** RTS on. */ | |
158 | SP_RTS_ON = 1, | |
159 | /** RTS used for flow control. */ | |
160 | SP_RTS_FLOW_CONTROL = 2, | |
161 | }; | |
162 | ||
163 | /** CTS pin behaviour. */ | |
164 | enum sp_cts { | |
165 | /** Special value to indicate setting should be left alone. */ | |
166 | SP_CTS_INVALID = -1, | |
167 | /** CTS ignored. */ | |
168 | SP_CTS_IGNORE = 0, | |
169 | /** CTS used for flow control. */ | |
170 | SP_CTS_FLOW_CONTROL = 1, | |
171 | }; | |
172 | ||
173 | /** DTR pin behaviour. */ | |
174 | enum sp_dtr { | |
175 | /** Special value to indicate setting should be left alone. */ | |
176 | SP_DTR_INVALID = -1, | |
177 | /** DTR off. */ | |
178 | SP_DTR_OFF = 0, | |
179 | /** DTR on. */ | |
180 | SP_DTR_ON = 1, | |
181 | /** DTR used for flow control. */ | |
182 | SP_DTR_FLOW_CONTROL = 2, | |
183 | }; | |
184 | ||
185 | /** DSR pin behaviour. */ | |
186 | enum sp_dsr { | |
187 | /** Special value to indicate setting should be left alone. */ | |
188 | SP_DSR_INVALID = -1, | |
189 | /** DSR ignored. */ | |
190 | SP_DSR_IGNORE = 0, | |
191 | /** DSR used for flow control. */ | |
192 | SP_DSR_FLOW_CONTROL = 1, | |
193 | }; | |
194 | ||
195 | /** XON/XOFF flow control behaviour. */ | |
196 | enum sp_xonxoff { | |
197 | /** Special value to indicate setting should be left alone. */ | |
198 | SP_XONXOFF_INVALID = -1, | |
199 | /** XON/XOFF disabled. */ | |
200 | SP_XONXOFF_DISABLED = 0, | |
201 | /** XON/XOFF enabled for input only. */ | |
202 | SP_XONXOFF_IN = 1, | |
203 | /** XON/XOFF enabled for output only. */ | |
204 | SP_XONXOFF_OUT = 2, | |
205 | /** XON/XOFF enabled for input and output. */ | |
206 | SP_XONXOFF_INOUT = 3, | |
207 | }; | |
208 | ||
209 | /** Standard flow control combinations. */ | |
210 | enum sp_flowcontrol { | |
211 | /** No flow control. */ | |
212 | SP_FLOWCONTROL_NONE = 0, | |
213 | /** Software flow control using XON/XOFF characters. */ | |
214 | SP_FLOWCONTROL_XONXOFF = 1, | |
215 | /** Hardware flow control using RTS/CTS signals. */ | |
216 | SP_FLOWCONTROL_RTSCTS = 2, | |
217 | /** Hardware flow control using DTR/DSR signals. */ | |
218 | SP_FLOWCONTROL_DTRDSR = 3, | |
219 | }; | |
220 | ||
221 | /** Input signals. */ | |
222 | enum sp_signal { | |
223 | /** Clear to send. */ | |
224 | SP_SIG_CTS = 1, | |
225 | /** Data set ready. */ | |
226 | SP_SIG_DSR = 2, | |
227 | /** Data carrier detect. */ | |
228 | SP_SIG_DCD = 4, | |
229 | /** Ring indicator. */ | |
230 | SP_SIG_RI = 8, | |
231 | }; | |
232 | ||
233 | /** A serial port. */ | |
234 | struct sp_port; | |
235 | ||
236 | /** Configuration for a serial port. */ | |
237 | struct sp_port_config; | |
238 | ||
239 | /** | |
240 | @defgroup Enumeration Port enumeration | |
241 | @{ | |
242 | */ | |
243 | ||
244 | /** | |
245 | * Obtain a pointer to a new sp_port structure representing the named port. | |
246 | * | |
247 | * The user should allocate a variable of type "struct sp_port *" and pass a | |
248 | * pointer to this to receive the result. | |
249 | * | |
250 | * The result should be freed after use by calling sp_free_port(). | |
251 | * | |
252 | * If any error is returned, the variable pointed to by port_ptr will be set | |
253 | * to NULL. Otherwise, it will be set to point to the newly allocated port. | |
254 | * | |
255 | * @return SP_OK upon success, a negative error code otherwise. | |
256 | */ | |
257 | enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr); | |
258 | ||
259 | /** | |
260 | * Free a port structure obtained from sp_get_port_by_name() or sp_copy_port(). | |
261 | */ | |
262 | void sp_free_port(struct sp_port *port); | |
263 | ||
264 | /** | |
265 | * List the serial ports available on the system. | |
266 | * | |
267 | * The result obtained is an array of pointers to sp_port structures, | |
268 | * terminated by a NULL. The user should allocate a variable of type | |
269 | * "struct sp_port **" and pass a pointer to this to receive the result. | |
270 | * | |
271 | * The result should be freed after use by calling sp_free_port_list(). | |
272 | * If a port from the list is to be used after freeing the list, it must be | |
273 | * copied first using sp_copy_port(). | |
274 | * | |
275 | * If any error is returned, the variable pointed to by list_ptr will be set | |
276 | * to NULL. Otherwise, it will be set to point to the newly allocated array. | |
277 | * | |
278 | * @return SP_OK upon success, a negative error code otherwise. | |
279 | */ | |
280 | enum sp_return sp_list_ports(struct sp_port ***list_ptr); | |
281 | ||
282 | /** | |
283 | * Make a new copy of a sp_port structure. | |
284 | * | |
285 | * The user should allocate a variable of type "struct sp_port *" and pass a | |
286 | * pointer to this to receive the result. | |
287 | * | |
288 | * The copy should be freed after use by calling sp_free_port(). | |
289 | * | |
290 | * If any error is returned, the variable pointed to by copy_ptr will be set | |
291 | * to NULL. Otherwise, it will be set to point to the newly allocated copy. | |
292 | * | |
293 | * @return SP_OK upon success, a negative error code otherwise. | |
294 | */ | |
295 | enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr); | |
296 | ||
297 | /** | |
298 | * Free a port list obtained from sp_list_ports(). | |
299 | * | |
300 | * This will also free all the sp_port structures referred to from the list; | |
301 | * any that are to be retained must be copied first using sp_copy_port(). | |
302 | */ | |
303 | void sp_free_port_list(struct sp_port **ports); | |
304 | ||
305 | /** | |
306 | * @} | |
307 | * @defgroup Ports Opening, closing and querying ports | |
308 | * @{ | |
309 | */ | |
310 | ||
311 | /** | |
312 | * Open the specified serial port. | |
313 | * | |
314 | * @param port Pointer to port structure. | |
315 | * @param flags Flags to use when opening the serial port. | |
316 | * | |
317 | * @return SP_OK upon success, a negative error code otherwise. | |
318 | */ | |
319 | enum sp_return sp_open(struct sp_port *port, enum sp_mode flags); | |
320 | ||
321 | /** | |
322 | * Close the specified serial port. | |
323 | * | |
324 | * @return SP_OK upon success, a negative error code otherwise. | |
325 | */ | |
326 | enum sp_return sp_close(struct sp_port *port); | |
327 | ||
328 | /** | |
329 | * Get the name of a port. | |
330 | * | |
331 | * The name returned is whatever is normally used to refer to a port on the | |
332 | * current operating system; e.g. for Windows it will usually be a "COMn" | |
333 | * device name, and for Unix it will be a device path beginning with "/dev/". | |
334 | * | |
335 | * @param port Pointer to port structure. | |
336 | * | |
337 | * @return The port name, or NULL if an invalid port is passed. The name | |
338 | * string is part of the port structure and may not be used after the | |
339 | * port structure has been freed. | |
340 | */ | |
341 | char *sp_get_port_name(const struct sp_port *port); | |
342 | ||
343 | /** | |
344 | * Get the operating system handle for a port. | |
345 | * | |
346 | * The type of the handle depends on the operating system. On Unix based | |
347 | * systems, the handle is a file descriptor of type "int". On Windows, the | |
348 | * handle is of type "HANDLE". The user should allocate a variable of the | |
349 | * appropriate type and pass a pointer to this to receive the result. | |
350 | * | |
351 | * To obtain a valid handle, the port must first be opened by calling | |
352 | * sp_open() using the same port structure. | |
353 | * | |
354 | * After the port is closed or the port structure freed, the handle may | |
355 | * no longer be valid. | |
356 | * | |
357 | * @warning This feature is provided so that programs may make use of | |
358 | * OS-specific functionality where desired. Doing so obviously | |
359 | * comes at a cost in portability. It also cannot be guaranteed | |
360 | * that direct usage of the OS handle will not conflict with the | |
361 | * library's own usage of the port. Be careful. | |
362 | * | |
363 | * @return SP_OK upon success, a negative error code otherwise. | |
364 | */ | |
365 | enum sp_return sp_get_port_handle(const struct sp_port *port, void *result_ptr); | |
366 | ||
367 | /** | |
368 | * @} | |
369 | * @defgroup Configuration Setting port parameters | |
370 | * @{ | |
371 | */ | |
372 | ||
373 | /** | |
374 | * Allocate a port configuration structure. | |
375 | * | |
376 | * The user should allocate a variable of type "struct sp_config *" and pass a | |
377 | * pointer to this to receive the result. The variable will be updated to | |
378 | * point to the new configuration structure. The structure is opaque and must | |
379 | * be accessed via the functions provided. | |
380 | * | |
381 | * All parameters in the structure will be initialised to special values which | |
382 | * are ignored by sp_set_config(). | |
383 | * | |
384 | * The structure should be freed after use by calling sp_free_config(). | |
385 | * | |
386 | * @param config_ptr Pointer to variable to receive result. | |
387 | * | |
388 | * @return SP_OK upon success, a negative error code otherwise. | |
389 | */ | |
390 | enum sp_return sp_new_config(struct sp_port_config **config_ptr); | |
391 | ||
392 | /** | |
393 | * Free a port configuration structure. | |
394 | * | |
395 | * @param config Pointer to configuration structure. | |
396 | */ | |
397 | void sp_free_config(struct sp_port_config *config); | |
398 | ||
399 | /** | |
400 | * Get the current configuration of the specified serial port. | |
401 | * | |
402 | * The user should allocate a configuration structure using sp_new_config() | |
403 | * and pass this as the config parameter. The configuration structure will | |
404 | * be updated with the port configuration. | |
405 | * | |
406 | * Any parameters that are configured with settings not recognised or | |
407 | * supported by libserialport, will be set to special values that are | |
408 | * ignored by sp_set_config(). | |
409 | * | |
410 | * @return SP_OK upon success, a negative error code otherwise. | |
411 | */ | |
412 | enum sp_return sp_get_config(struct sp_port *port, struct sp_port_config *config); | |
413 | ||
414 | /** | |
415 | * Set the configuration for the specified serial port. | |
416 | * | |
417 | * For each parameter in the configuration, there is a special value (usually | |
418 | * -1, but see the documentation for each field). These values will be ignored | |
419 | * and the corresponding setting left unchanged on the port. | |
420 | * | |
421 | * @return SP_OK upon success, a negative error code otherwise. | |
422 | */ | |
423 | enum sp_return sp_set_config(struct sp_port *port, const struct sp_port_config *config); | |
424 | ||
425 | /** | |
426 | * Set the baud rate for the specified serial port. | |
427 | * | |
428 | * @param port Pointer to port structure. | |
429 | * @param baudrate Baud rate in bits per second. | |
430 | * | |
431 | * @return SP_OK upon success, a negative error code otherwise. | |
432 | */ | |
433 | enum sp_return sp_set_baudrate(struct sp_port *port, int baudrate); | |
434 | ||
435 | /** | |
436 | * Get the baud rate from a port configuration. | |
437 | * | |
438 | * The user should allocate a variable of type int and pass a pointer to this | |
439 | * to receive the result. | |
440 | * | |
441 | * @param config Pointer to configuration structure. | |
442 | * @param baudrate_ptr Pointer to variable to store result. | |
443 | * | |
444 | * @return SP_OK upon success, a negative error code otherwise. | |
445 | */ | |
446 | enum sp_return sp_get_config_baudrate(const struct sp_port_config *config, int *baudrate_ptr); | |
447 | ||
448 | /** | |
449 | * Set the baud rate in a port configuration. | |
450 | * | |
451 | * @param config Pointer to configuration structure. | |
452 | * @param baudrate Baud rate in bits per second, or -1 to retain current setting. | |
453 | * | |
454 | * @return SP_OK upon success, a negative error code otherwise. | |
455 | */ | |
456 | enum sp_return sp_set_config_baudrate(struct sp_port_config *config, int baudrate); | |
457 | ||
458 | /** | |
459 | * Set the data bits for the specified serial port. | |
460 | * | |
461 | * @param port Pointer to port structure. | |
462 | * @param bits Number of data bits. | |
463 | * | |
464 | * @return SP_OK upon success, a negative error code otherwise. | |
465 | */ | |
466 | enum sp_return sp_set_bits(struct sp_port *port, int bits); | |
467 | ||
468 | /** | |
469 | * Get the data bits from a port configuration. | |
470 | * | |
471 | * The user should allocate a variable of type int and pass a pointer to this | |
472 | * to receive the result. | |
473 | * | |
474 | * @param config Pointer to configuration structure. | |
475 | * @param bits_ptr Pointer to variable to store result. | |
476 | * | |
477 | * @return SP_OK upon success, a negative error code otherwise. | |
478 | */ | |
479 | enum sp_return sp_get_config_bits(const struct sp_port_config *config, int *bits_ptr); | |
480 | ||
481 | /** | |
482 | * Set the data bits in a port configuration. | |
483 | * | |
484 | * @param config Pointer to configuration structure. | |
485 | * @param bits Number of data bits, or -1 to retain current setting. | |
486 | * | |
487 | * @return SP_OK upon success, a negative error code otherwise. | |
488 | */ | |
489 | enum sp_return sp_set_config_bits(struct sp_port_config *config, int bits); | |
490 | ||
491 | /** | |
492 | * Set the parity setting for the specified serial port. | |
493 | * | |
494 | * @param port Pointer to port structure. | |
495 | * @param parity Parity setting. | |
496 | * | |
497 | * @return SP_OK upon success, a negative error code otherwise. | |
498 | */ | |
499 | enum sp_return sp_set_parity(struct sp_port *port, enum sp_parity parity); | |
500 | ||
501 | /** | |
502 | * Get the parity setting from a port configuration. | |
503 | * | |
504 | * The user should allocate a variable of type enum sp_parity and pass a pointer to this | |
505 | * to receive the result. | |
506 | * | |
507 | * @param config Pointer to configuration structure. | |
508 | * @param parity_ptr Pointer to variable to store result. | |
509 | * | |
510 | * @return SP_OK upon success, a negative error code otherwise. | |
511 | */ | |
512 | enum sp_return sp_get_config_parity(const struct sp_port_config *config, enum sp_parity *parity_ptr); | |
513 | ||
514 | /** | |
515 | * Set the parity setting in a port configuration. | |
516 | * | |
517 | * @param config Pointer to configuration structure. | |
518 | * @param parity Parity setting, or -1 to retain current setting. | |
519 | * | |
520 | * @return SP_OK upon success, a negative error code otherwise. | |
521 | */ | |
522 | enum sp_return sp_set_config_parity(struct sp_port_config *config, enum sp_parity parity); | |
523 | ||
524 | /** | |
525 | * Set the stop bits for the specified serial port. | |
526 | * | |
527 | * @param port Pointer to port structure. | |
528 | * @param stopbits Number of stop bits. | |
529 | * | |
530 | * @return SP_OK upon success, a negative error code otherwise. | |
531 | */ | |
532 | enum sp_return sp_set_stopbits(struct sp_port *port, int stopbits); | |
533 | ||
534 | /** | |
535 | * Get the stop bits from a port configuration. | |
536 | * | |
537 | * The user should allocate a variable of type int and pass a pointer to this | |
538 | * to receive the result. | |
539 | * | |
540 | * @param config Pointer to configuration structure. | |
541 | * @param stopbits_ptr Pointer to variable to store result. | |
542 | * | |
543 | * @return SP_OK upon success, a negative error code otherwise. | |
544 | */ | |
545 | enum sp_return sp_get_config_stopbits(const struct sp_port_config *config, int *stopbits_ptr); | |
546 | ||
547 | /** | |
548 | * Set the stop bits in a port configuration. | |
549 | * | |
550 | * @param config Pointer to configuration structure. | |
551 | * @param stopbits Number of stop bits, or -1 to retain current setting. | |
552 | * | |
553 | * @return SP_OK upon success, a negative error code otherwise. | |
554 | */ | |
555 | enum sp_return sp_set_config_stopbits(struct sp_port_config *config, int stopbits); | |
556 | ||
557 | /** | |
558 | * Set the RTS pin behaviour for the specified serial port. | |
559 | * | |
560 | * @param port Pointer to port structure. | |
561 | * @param rts RTS pin mode. | |
562 | * | |
563 | * @return SP_OK upon success, a negative error code otherwise. | |
564 | */ | |
565 | enum sp_return sp_set_rts(struct sp_port *port, enum sp_rts rts); | |
566 | ||
567 | /** | |
568 | * Get the RTS pin behaviour from a port configuration. | |
569 | * | |
570 | * The user should allocate a variable of type enum sp_rts and pass a pointer to this | |
571 | * to receive the result. | |
572 | * | |
573 | * @param config Pointer to configuration structure. | |
574 | * @param rts_ptr Pointer to variable to store result. | |
575 | * | |
576 | * @return SP_OK upon success, a negative error code otherwise. | |
577 | */ | |
578 | enum sp_return sp_get_config_rts(const struct sp_port_config *config, enum sp_rts *rts_ptr); | |
579 | ||
580 | /** | |
581 | * Set the RTS pin behaviour in a port configuration. | |
582 | * | |
583 | * @param config Pointer to configuration structure. | |
584 | * @param rts RTS pin mode, or -1 to retain current setting. | |
585 | * | |
586 | * @return SP_OK upon success, a negative error code otherwise. | |
587 | */ | |
588 | enum sp_return sp_set_config_rts(struct sp_port_config *config, enum sp_rts rts); | |
589 | ||
590 | /** | |
591 | * Set the CTS pin behaviour for the specified serial port. | |
592 | * | |
593 | * @param port Pointer to port structure. | |
594 | * @param cts CTS pin mode. | |
595 | * | |
596 | * @return SP_OK upon success, a negative error code otherwise. | |
597 | */ | |
598 | enum sp_return sp_set_cts(struct sp_port *port, enum sp_cts cts); | |
599 | ||
600 | /** | |
601 | * Get the CTS pin behaviour from a port configuration. | |
602 | * | |
603 | * The user should allocate a variable of type enum sp_cts and pass a pointer to this | |
604 | * to receive the result. | |
605 | * | |
606 | * @param config Pointer to configuration structure. | |
607 | * @param cts_ptr Pointer to variable to store result. | |
608 | * | |
609 | * @return SP_OK upon success, a negative error code otherwise. | |
610 | */ | |
611 | enum sp_return sp_get_config_cts(const struct sp_port_config *config, enum sp_cts *cts_ptr); | |
612 | ||
613 | /** | |
614 | * Set the CTS pin behaviour in a port configuration. | |
615 | * | |
616 | * @param config Pointer to configuration structure. | |
617 | * @param cts CTS pin mode, or -1 to retain current setting. | |
618 | * | |
619 | * @return SP_OK upon success, a negative error code otherwise. | |
620 | */ | |
621 | enum sp_return sp_set_config_cts(struct sp_port_config *config, enum sp_cts cts); | |
622 | ||
623 | /** | |
624 | * Set the DTR pin behaviour for the specified serial port. | |
625 | * | |
626 | * @param port Pointer to port structure. | |
627 | * @param dtr DTR pin mode. | |
628 | * | |
629 | * @return SP_OK upon success, a negative error code otherwise. | |
630 | */ | |
631 | enum sp_return sp_set_dtr(struct sp_port *port, enum sp_dtr dtr); | |
632 | ||
633 | /** | |
634 | * Get the DTR pin behaviour from a port configuration. | |
635 | * | |
636 | * The user should allocate a variable of type enum sp_dtr and pass a pointer to this | |
637 | * to receive the result. | |
638 | * | |
639 | * @param config Pointer to configuration structure. | |
640 | * @param dtr_ptr Pointer to variable to store result. | |
641 | * | |
642 | * @return SP_OK upon success, a negative error code otherwise. | |
643 | */ | |
644 | enum sp_return sp_get_config_dtr(const struct sp_port_config *config, enum sp_dtr *dtr_ptr); | |
645 | ||
646 | /** | |
647 | * Set the DTR pin behaviour in a port configuration. | |
648 | * | |
649 | * @param config Pointer to configuration structure. | |
650 | * @param dtr DTR pin mode, or -1 to retain current setting. | |
651 | * | |
652 | * @return SP_OK upon success, a negative error code otherwise. | |
653 | */ | |
654 | enum sp_return sp_set_config_dtr(struct sp_port_config *config, enum sp_dtr dtr); | |
655 | ||
656 | /** | |
657 | * Set the DSR pin behaviour for the specified serial port. | |
658 | * | |
659 | * @param port Pointer to port structure. | |
660 | * @param dsr DSR pin mode. | |
661 | * | |
662 | * @return SP_OK upon success, a negative error code otherwise. | |
663 | */ | |
664 | enum sp_return sp_set_dsr(struct sp_port *port, enum sp_dsr dsr); | |
665 | ||
666 | /** | |
667 | * Get the DSR pin behaviour from a port configuration. | |
668 | * | |
669 | * The user should allocate a variable of type enum sp_dsr and pass a pointer to this | |
670 | * to receive the result. | |
671 | * | |
672 | * @param config Pointer to configuration structure. | |
673 | * @param dsr_ptr Pointer to variable to store result. | |
674 | * | |
675 | * @return SP_OK upon success, a negative error code otherwise. | |
676 | */ | |
677 | enum sp_return sp_get_config_dsr(const struct sp_port_config *config, enum sp_dsr *dsr_ptr); | |
678 | ||
679 | /** | |
680 | * Set the DSR pin behaviour in a port configuration. | |
681 | * | |
682 | * @param config Pointer to configuration structure. | |
683 | * @param dsr DSR pin mode, or -1 to retain current setting. | |
684 | * | |
685 | * @return SP_OK upon success, a negative error code otherwise. | |
686 | */ | |
687 | enum sp_return sp_set_config_dsr(struct sp_port_config *config, enum sp_dsr dsr); | |
688 | ||
689 | /** | |
690 | * Set the XON/XOFF configuration for the specified serial port. | |
691 | * | |
692 | * @param port Pointer to port structure. | |
693 | * @param xon_xoff XON/XOFF mode. | |
694 | * | |
695 | * @return SP_OK upon success, a negative error code otherwise. | |
696 | */ | |
697 | enum sp_return sp_set_xon_xoff(struct sp_port *port, enum sp_xonxoff xon_xoff); | |
698 | ||
699 | /** | |
700 | * Get the XON/XOFF configuration from a port configuration. | |
701 | * | |
702 | * The user should allocate a variable of type enum sp_xonxoff and pass a pointer to this | |
703 | * to receive the result. | |
704 | * | |
705 | * @param config Pointer to configuration structure. | |
706 | * @param xon_xoff_ptr Pointer to variable to store result. | |
707 | * | |
708 | * @return SP_OK upon success, a negative error code otherwise. | |
709 | */ | |
710 | enum sp_return sp_get_config_xon_xoff(const struct sp_port_config *config, enum sp_xonxoff *xon_xoff_ptr); | |
711 | ||
712 | /** | |
713 | * Set the XON/XOFF configuration in a port configuration. | |
714 | * | |
715 | * @param config Pointer to configuration structure. | |
716 | * @param xon_xoff XON/XOFF mode, or -1 to retain current setting. | |
717 | * | |
718 | * @return SP_OK upon success, a negative error code otherwise. | |
719 | */ | |
720 | enum sp_return sp_set_config_xon_xoff(struct sp_port_config *config, enum sp_xonxoff xon_xoff); | |
721 | ||
722 | /** | |
723 | * Set the flow control type in a port configuration. | |
724 | * | |
725 | * This function is a wrapper that sets the RTS, CTS, DTR, DSR and | |
726 | * XON/XOFF settings as necessary for the specified flow control | |
727 | * type. For more fine-grained control of these settings, use their | |
728 | * individual configuration functions. | |
729 | * | |
730 | * @param config Pointer to configuration structure. | |
731 | * @param flowcontrol Flow control setting to use. | |
732 | * | |
733 | * @return SP_OK upon success, a negative error code otherwise. | |
734 | */ | |
735 | enum sp_return sp_set_config_flowcontrol(struct sp_port_config *config, enum sp_flowcontrol flowcontrol); | |
736 | ||
737 | /** | |
738 | * Set the flow control type for the specified serial port. | |
739 | * | |
740 | * This function is a wrapper that sets the RTS, CTS, DTR, DSR and | |
741 | * XON/XOFF settings as necessary for the specified flow control | |
742 | * type. For more fine-grained control of these settings, use their | |
743 | * individual configuration functions. | |
744 | * | |
745 | * @param port Pointer to port structure. | |
746 | * @param flowcontrol Flow control setting to use. | |
747 | * | |
748 | * @return SP_OK upon success, a negative error code otherwise. | |
749 | */ | |
750 | enum sp_return sp_set_flowcontrol(struct sp_port *port, enum sp_flowcontrol flowcontrol); | |
751 | ||
752 | /** | |
753 | * @} | |
754 | * @defgroup Data Reading, writing, and flushing data | |
755 | * @{ | |
756 | */ | |
757 | ||
758 | /** | |
759 | * Read bytes from the specified serial port, blocking until available. | |
760 | * | |
761 | * @param port Pointer to port structure. | |
762 | * @param buf Buffer in which to store the bytes read. | |
763 | * @param count Requested number of bytes to read. | |
764 | * @param timeout Timeout in milliseconds, or zero to wait indefinitely. | |
765 | * | |
766 | * @return The number of bytes read on success, or a negative error code. If | |
767 | * the number of bytes returned is less than that requested, the | |
768 | * timeout was reached before the requested number of bytes was | |
769 | * available. If timeout is zero, the function will always return | |
770 | * either the requested number of bytes or a negative error code. | |
771 | */ | |
772 | enum sp_return sp_blocking_read(struct sp_port *port, void *buf, size_t count, unsigned int timeout); | |
773 | ||
774 | /** | |
775 | * Read bytes from the specified serial port, without blocking. | |
776 | * | |
777 | * @param port Pointer to port structure. | |
778 | * @param buf Buffer in which to store the bytes read. | |
779 | * @param count Maximum number of bytes to read. | |
780 | * | |
781 | * @return The number of bytes read on success, or a negative error code. The | |
782 | * number of bytes returned may be any number from zero to the maximum | |
783 | * that was requested. | |
784 | */ | |
785 | enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf, size_t count); | |
786 | ||
787 | /** | |
788 | * Write bytes to the specified serial port, blocking until complete. | |
789 | * | |
790 | * Note that this function only ensures that the accepted bytes have been | |
791 | * written to the OS; they may be held in driver or hardware buffers and not | |
792 | * yet physically transmitted. To check whether all written bytes have actually | |
793 | * been transmitted, use the sp_output_waiting() function. To wait until all | |
794 | * written bytes have actually been transmitted, use the sp_drain() function. | |
795 | * | |
796 | * @param port Pointer to port structure. | |
797 | * @param buf Buffer containing the bytes to write. | |
798 | * @param count Requested number of bytes to write. | |
799 | * @param timeout Timeout in milliseconds, or zero to wait indefinitely. | |
800 | * | |
801 | * @return The number of bytes read on success, or a negative error code. If | |
802 | * the number of bytes returned is less than that requested, the | |
803 | * timeout was reached before the requested number of bytes was | |
804 | * sent. If timeout is zero, the function will always return | |
805 | * either the requested number of bytes or a negative error code. In | |
806 | * the event of an error there is no way to determine how many bytes | |
807 | * were sent before the error occured. | |
808 | */ | |
809 | enum sp_return sp_blocking_write(struct sp_port *port, const void *buf, size_t count, unsigned int timeout); | |
810 | ||
811 | /** | |
812 | * Write bytes to the specified serial port, without blocking. | |
813 | * | |
814 | * Note that this function only ensures that the accepted bytes have been | |
815 | * written to the OS; they may be held in driver or hardware buffers and not | |
816 | * yet physically transmitted. To check whether all written bytes have actually | |
817 | * been transmitted, use the sp_output_waiting() function. To wait until all | |
818 | * written bytes have actually been transmitted, use the sp_drain() function. | |
819 | * | |
820 | * @param port Pointer to port structure. | |
821 | * @param buf Buffer containing the bytes to write. | |
822 | * @param count Maximum number of bytes to write. | |
823 | * | |
824 | * @return The number of bytes written on success, or a negative error code. | |
825 | * The number of bytes returned may be any number from zero to the | |
826 | * maximum that was requested. | |
827 | */ | |
828 | enum sp_return sp_nonblocking_write(struct sp_port *port, const void *buf, size_t count); | |
829 | ||
830 | /** | |
831 | * Flush serial port buffers. Data in the selected buffer(s) is discarded. | |
832 | * | |
833 | * @param port Pointer to port structure. | |
834 | * @param buffers Which buffer(s) to flush. | |
835 | * | |
836 | * @return SP_OK upon success, a negative error code otherwise. | |
837 | */ | |
838 | enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers); | |
839 | ||
840 | /** | |
841 | * Wait for buffered data to be transmitted. | |
842 | * | |
843 | * @param port Pointer to port structure. | |
844 | * | |
845 | * @return SP_OK upon success, a negative error code otherwise. | |
846 | */ | |
847 | enum sp_return sp_drain(struct sp_port *port); | |
848 | ||
849 | /** | |
850 | * @} | |
851 | * @defgroup Signals Port signalling operations | |
852 | * @{ | |
853 | */ | |
854 | ||
855 | /** | |
856 | * Gets the status of the control signals for the specified port. | |
857 | * | |
858 | * The user should allocate a variable of type "enum sp_signal" and pass a | |
859 | * pointer to this variable to receive the result. The result is a bitmask | |
860 | * in which individual signals can be checked by bitwise OR with values of | |
861 | * the sp_signal enum. | |
862 | * | |
863 | * @param port Pointer to port structure. | |
864 | * @param signals Pointer to variable to receive result. | |
865 | * | |
866 | * @return SP_OK upon success, a negative error code otherwise. | |
867 | */ | |
868 | enum sp_return sp_get_signals(struct sp_port *port, enum sp_signal *signals); | |
869 | ||
870 | /** | |
871 | * Put the port transmit line into the break state. | |
872 | * | |
873 | * @param port Pointer to port structure. | |
874 | * | |
875 | * @return SP_OK upon success, a negative error code otherwise. | |
876 | */ | |
877 | enum sp_return sp_start_break(struct sp_port *port); | |
878 | ||
879 | /** | |
880 | * Take the port transmit line out of the break state. | |
881 | * | |
882 | * @param port Pointer to port structure. | |
883 | * | |
884 | * @return SP_OK upon success, a negative error code otherwise. | |
885 | */ | |
886 | enum sp_return sp_end_break(struct sp_port *port); | |
887 | ||
888 | /** | |
889 | * @} | |
890 | * @defgroup Errors Obtaining error information | |
891 | * @{ | |
892 | */ | |
893 | ||
894 | /** | |
895 | * Get the error code for a failed operation. | |
896 | * | |
897 | * In order to obtain the correct result, this function should be called | |
898 | * straight after the failure, before executing any other system operations. | |
899 | * | |
900 | * @return The system's numeric code for the error that caused the last | |
901 | * operation to fail. | |
902 | */ | |
903 | int sp_last_error_code(void); | |
904 | ||
905 | /** | |
906 | * Get the error message for a failed operation. | |
907 | * | |
908 | * In order to obtain the correct result, this function should be called | |
909 | * straight after the failure, before executing other system operations. | |
910 | * | |
911 | * @return The system's message for the error that caused the last | |
912 | * operation to fail. This string may be allocated by the function, | |
913 | * and should be freed after use by calling sp_free_error_message(). | |
914 | */ | |
915 | char *sp_last_error_message(void); | |
916 | ||
917 | /** | |
918 | * Free an error message returned by sp_last_error_message(). | |
919 | */ | |
920 | void sp_free_error_message(char *message); | |
921 | ||
922 | /** | |
923 | * Set the handler function for library debugging messages. | |
924 | * | |
925 | * Debugging messages are generated by the library during each operation, | |
926 | * to help in diagnosing problems. The handler will be called for each | |
927 | * message. The handler can be set to NULL to ignore all debug messages. | |
928 | * | |
929 | * The handler function should accept a format string and variable length | |
930 | * argument list, in the same manner as e.g. printf(). | |
931 | * | |
932 | * The default handler is sp_default_debug_handler(). | |
933 | */ | |
934 | void sp_set_debug_handler(void (*handler)(const char *format, ...)); | |
935 | ||
936 | /** | |
937 | * Default handler function for library debugging messages. | |
938 | * | |
939 | * This function prints debug messages to the standard error stream if the | |
940 | * environment variable LIBSERIALPORT_DEBUG is set. Otherwise, they are | |
941 | * ignored. | |
942 | */ | |
943 | void sp_default_debug_handler(const char *format, ...); | |
944 | ||
945 | /** @} */ | |
946 | ||
947 | #ifdef __cplusplus | |
948 | } | |
949 | #endif | |
950 | ||
951 | #endif |