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74510d4b ML |
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 | ||
cd5f5281 | 20 | /** |
cf9d365c UH |
21 | * |
22 | * @mainpage libserialport API | |
23 | * | |
24 | * Introduction | |
25 | * ============ | |
26 | * | |
27 | * libserialport is a minimal library written in C that is intended to take | |
28 | * care of the OS-specific details when writing software that uses serial ports. | |
29 | * | |
30 | * By writing your serial code to use libserialport, you enable it to work | |
31 | * transparently on any platform supported by the library. | |
32 | * | |
33 | * The operations that are supported are: | |
34 | * | |
35 | * - @ref Enumeration (obtaining a list of serial ports on the system) | |
36 | * - @ref Ports | |
37 | * - @ref Configuration (baud rate, parity, 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 | * All functions can return only three possible error values. @ref SP_ERR_ARG | |
54 | * indicates the function was called with invalid arguments. @ref SP_ERR_FAIL | |
55 | * indicates that the OS reported a failure. @ref SP_ERR_MEM indicates that a | |
56 | * memory allocation failed. All of these error values are negative. | |
57 | * | |
58 | * When @ref SP_ERR_FAIL is returned, an error code or string description of | |
59 | * the error can be obtained by calling sp_last_error_code() or | |
60 | * sp_last_error_message(). The error code or message is that provided by the | |
61 | * OS; libserialport does not define any error codes or messages of its own. | |
62 | * | |
63 | * Function calls that succeed return @ref SP_OK, which is equal to zero, | |
64 | * or where otherwise documented a positive value. | |
65 | */ | |
cd5f5281 | 66 | |
f92f1f0c UH |
67 | #ifndef LIBSERIALPORT_H |
68 | #define LIBSERIALPORT_H | |
e8ffaee9 | 69 | |
5ef8a1ed UH |
70 | #ifdef __cplusplus |
71 | extern "C" { | |
72 | #endif | |
73 | ||
74510d4b ML |
74 | #include <stddef.h> |
75 | #ifdef _WIN32 | |
76 | #include <windows.h> | |
77 | #endif | |
78 | ||
baba0759 UH |
79 | /* Package version macros (e.g. for conditional compilation). */ |
80 | #define SP_PACKAGE_VERSION_MAJOR @SP_PACKAGE_VERSION_MAJOR@ | |
81 | #define SP_PACKAGE_VERSION_MINOR @SP_PACKAGE_VERSION_MINOR@ | |
82 | #define SP_PACKAGE_VERSION_STRING "@SP_PACKAGE_VERSION@" | |
83 | ||
84 | /* Library/libtool version macros (e.g. for conditional compilation). */ | |
85 | #define SP_LIB_VERSION_CURRENT @SP_LIB_VERSION_CURRENT@ | |
86 | #define SP_LIB_VERSION_REVISION @SP_LIB_VERSION_REVISION@ | |
87 | #define SP_LIB_VERSION_AGE @SP_LIB_VERSION_AGE@ | |
88 | #define SP_LIB_VERSION_STRING "@SP_LIB_VERSION@" | |
89 | ||
cd5f5281 | 90 | /** Return values. */ |
eb6ed20f | 91 | enum sp_return { |
cd5f5281 | 92 | /** Operation completed successfully. */ |
74510d4b | 93 | SP_OK = 0, |
cd5f5281 | 94 | /** Invalid arguments were passed to the function. */ |
e9a2f9c9 | 95 | SP_ERR_ARG = -1, |
cd5f5281 | 96 | /** A system error occured while executing the operation. */ |
e9a2f9c9 | 97 | SP_ERR_FAIL = -2, |
cd5f5281 | 98 | /** A memory allocation failed while executing the operation. */ |
f92f1f0c | 99 | SP_ERR_MEM = -3, |
74510d4b ML |
100 | }; |
101 | ||
cd5f5281 | 102 | /** Port access modes. */ |
eb6ed20f | 103 | enum sp_mode { |
cd5f5281 | 104 | /** Open port for read/write access. */ |
74510d4b | 105 | SP_MODE_RDWR = 1, |
cd5f5281 | 106 | /** Open port for read access only. */ |
74510d4b | 107 | SP_MODE_RDONLY = 2, |
cd5f5281 | 108 | /** Open port in non-blocking mode. */ |
f92f1f0c | 109 | SP_MODE_NONBLOCK = 4, |
74510d4b ML |
110 | }; |
111 | ||
cd5f5281 | 112 | /** Parity settings. */ |
eb6ed20f | 113 | enum sp_parity { |
c200f5c1 | 114 | /** Special value to indicate setting should be left alone. */ |
eb6ed20f | 115 | SP_PARITY_INVALID = -1, |
cd5f5281 | 116 | /** No parity. */ |
74510d4b | 117 | SP_PARITY_NONE = 0, |
cd5f5281 | 118 | /** Even parity. */ |
74510d4b | 119 | SP_PARITY_EVEN = 1, |
cd5f5281 | 120 | /** Odd parity. */ |
f92f1f0c | 121 | SP_PARITY_ODD = 2, |
74510d4b ML |
122 | }; |
123 | ||
cd5f5281 | 124 | /** RTS pin behaviour. */ |
eb6ed20f | 125 | enum sp_rts { |
c200f5c1 | 126 | /** Special value to indicate setting should be left alone. */ |
eb6ed20f | 127 | SP_RTS_INVALID = -1, |
cd5f5281 | 128 | /** RTS off. */ |
d514a26f | 129 | SP_RTS_OFF = 0, |
cd5f5281 | 130 | /** RTS on. */ |
d514a26f | 131 | SP_RTS_ON = 1, |
cd5f5281 | 132 | /** RTS used for flow control. */ |
cf9d365c | 133 | SP_RTS_FLOW_CONTROL = 2, |
d514a26f ML |
134 | }; |
135 | ||
cd5f5281 | 136 | /** CTS pin behaviour. */ |
eb6ed20f | 137 | enum sp_cts { |
c200f5c1 | 138 | /** Special value to indicate setting should be left alone. */ |
eb6ed20f | 139 | SP_CTS_INVALID = -1, |
cd5f5281 | 140 | /** CTS ignored. */ |
d514a26f | 141 | SP_CTS_IGNORE = 0, |
cd5f5281 | 142 | /** CTS used for flow control. */ |
cf9d365c | 143 | SP_CTS_FLOW_CONTROL = 1, |
d514a26f ML |
144 | }; |
145 | ||
cd5f5281 | 146 | /** DTR pin behaviour. */ |
eb6ed20f | 147 | enum sp_dtr { |
c200f5c1 | 148 | /** Special value to indicate setting should be left alone. */ |
eb6ed20f | 149 | SP_DTR_INVALID = -1, |
cd5f5281 | 150 | /** DTR off. */ |
d514a26f | 151 | SP_DTR_OFF = 0, |
cd5f5281 | 152 | /** DTR on. */ |
d514a26f | 153 | SP_DTR_ON = 1, |
cd5f5281 | 154 | /** DTR used for flow control. */ |
cf9d365c | 155 | SP_DTR_FLOW_CONTROL = 2, |
d514a26f ML |
156 | }; |
157 | ||
cd5f5281 | 158 | /** DSR pin behaviour. */ |
eb6ed20f | 159 | enum sp_dsr { |
c200f5c1 | 160 | /** Special value to indicate setting should be left alone. */ |
eb6ed20f | 161 | SP_DSR_INVALID = -1, |
cd5f5281 | 162 | /** DSR ignored. */ |
d514a26f | 163 | SP_DSR_IGNORE = 0, |
cd5f5281 | 164 | /** DSR used for flow control. */ |
cf9d365c | 165 | SP_DSR_FLOW_CONTROL = 1, |
d514a26f ML |
166 | }; |
167 | ||
cd5f5281 | 168 | /** XON/XOFF flow control behaviour. */ |
eb6ed20f | 169 | enum sp_xonxoff { |
c200f5c1 | 170 | /** Special value to indicate setting should be left alone. */ |
eb6ed20f | 171 | SP_XONXOFF_INVALID = -1, |
cd5f5281 | 172 | /** XON/XOFF disabled. */ |
d514a26f | 173 | SP_XONXOFF_DISABLED = 0, |
cd5f5281 | 174 | /** XON/XOFF enabled for input only. */ |
d514a26f | 175 | SP_XONXOFF_IN = 1, |
cd5f5281 | 176 | /** XON/XOFF enabled for output only. */ |
d514a26f | 177 | SP_XONXOFF_OUT = 2, |
cd5f5281 | 178 | /** XON/XOFF enabled for input and output. */ |
cf9d365c | 179 | SP_XONXOFF_INOUT = 3, |
ac74fdaf ML |
180 | }; |
181 | ||
cd5f5281 | 182 | /** Standard flow control combinations. */ |
eb6ed20f | 183 | enum sp_flowcontrol { |
cd5f5281 | 184 | /** No flow control. */ |
18fc2dd1 | 185 | SP_FLOWCONTROL_NONE = 0, |
cd5f5281 | 186 | /** Software flow control using XON/XOFF characters. */ |
18fc2dd1 | 187 | SP_FLOWCONTROL_XONXOFF = 1, |
cd5f5281 | 188 | /** Hardware flow control using RTS/CTS signals. */ |
18fc2dd1 | 189 | SP_FLOWCONTROL_RTSCTS = 2, |
cd5f5281 | 190 | /** Hardware flow control using DTR/DSR signals. */ |
cf9d365c | 191 | SP_FLOWCONTROL_DTRDSR = 3, |
18fc2dd1 ML |
192 | }; |
193 | ||
eb6ed20f ML |
194 | /** A serial port. */ |
195 | struct sp_port { | |
cf9d365c | 196 | /** Name used to open the port. */ |
eb6ed20f | 197 | char *name; |
626d280f | 198 | /** @cond 0 */ |
cf9d365c | 199 | /** OS-specific port handle. */ |
eb6ed20f ML |
200 | #ifdef _WIN32 |
201 | HANDLE hdl; | |
202 | #else | |
203 | int fd; | |
204 | #endif | |
626d280f | 205 | /** @endcond */ |
eb6ed20f ML |
206 | }; |
207 | ||
208 | /** Configuration for a serial port. */ | |
209 | struct sp_port_config { | |
210 | /** Baud rate in bits per second. */ | |
211 | int baudrate; | |
212 | /** Number of data bits to use. Valid values are 5 to 8. */ | |
213 | int bits; | |
214 | /** Parity setting to use. */ | |
215 | enum sp_parity parity; | |
216 | /** Number of stop bits to use (1 or 2). */ | |
217 | int stopbits; | |
218 | /** RTS pin mode. */ | |
219 | enum sp_rts rts; | |
220 | /** CTS pin mode. */ | |
221 | enum sp_cts cts; | |
222 | /** DTR pin mode. */ | |
223 | enum sp_dtr dtr; | |
224 | /** DSR pin mode. */ | |
225 | enum sp_dsr dsr; | |
226 | /** XON/XOFF flow control mode. */ | |
227 | enum sp_xonxoff xon_xoff; | |
228 | }; | |
229 | ||
091e75fe | 230 | /** |
626d280f | 231 | @defgroup Enumeration Port enumeration |
091e75fe ML |
232 | @{ |
233 | */ | |
234 | ||
cd5f5281 | 235 | /** |
cf9d365c UH |
236 | * Obtain a pointer to a new sp_port structure representing the named port. |
237 | * | |
238 | * The user should allocate a variable of type "struct sp_port *" and pass a | |
239 | * pointer to this to receive the result. | |
240 | * | |
241 | * The result should be freed after use by calling sp_free_port(). | |
242 | * | |
243 | * @return SP_OK on success, SP_ERR_FAIL on failure, SP_ERR_MEM on allocation | |
244 | * failure, or SP_ERR_ARG if an invalid pointer is passed. If any error | |
245 | * is returned, the variable pointed to by port_ptr will be set to NULL. | |
246 | * Otherwise, it will be set to point to the newly allocated port. | |
247 | */ | |
eb6ed20f | 248 | enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr); |
cd5f5281 ML |
249 | |
250 | /** | |
cf9d365c UH |
251 | * Free a port structure obtained from sp_get_port_by_name() or sp_copy_port(). |
252 | */ | |
e3b2f7a4 | 253 | void sp_free_port(struct sp_port *port); |
cd5f5281 ML |
254 | |
255 | /** | |
cf9d365c UH |
256 | * List the serial ports available on the system. |
257 | * | |
258 | * The result obtained is an array of pointers to sp_port structures, | |
259 | * terminated by a NULL. The user should allocate a variable of type | |
260 | * "struct sp_port **" and pass a pointer to this to receive the result. | |
261 | * | |
262 | * The result should be freed after use by calling sp_free_port_list(). | |
263 | * If a port from the list is to be used after freeing the list, it must be | |
264 | * copied first using sp_copy_port(). | |
265 | * | |
266 | * @return SP_OK on success, SP_ERR_FAIL on failure, SP_ERR_MEM on allocation | |
267 | * failure, or SP_ERR_ARG if an invalid pointer is passed. If any error | |
268 | * is returned, the variable pointed to by list_ptr will be set to NULL. | |
269 | * Otherwise, it will be set to point to the newly allocated array. | |
270 | */ | |
eb6ed20f | 271 | enum sp_return sp_list_ports(struct sp_port ***list_ptr); |
cd5f5281 ML |
272 | |
273 | /** | |
cf9d365c UH |
274 | * Make a new copy of a sp_port structure. |
275 | * | |
276 | * The user should allocate a variable of type "struct sp_port *" and pass a | |
277 | * pointer to this to receive the result. | |
278 | * | |
279 | * The copy should be freed after use by calling sp_free_port(). | |
280 | * | |
281 | * @return SP_OK on success, SP_ERR_MEM on allocation failure, or SP_ERR_ARG | |
282 | * if an invalid port or pointer is passed. If any error is returned, | |
283 | * the variable pointed to by copy_ptr will be set to NULL. Otherwise, | |
284 | * it will be set to point to the newly allocated copy. | |
285 | */ | |
eb6ed20f | 286 | enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr); |
cd5f5281 ML |
287 | |
288 | /** | |
cf9d365c UH |
289 | * Free a port list obtained from sp_list_ports(). |
290 | * | |
291 | * This will also free all the sp_port structures referred to from the list; | |
292 | * any that are to be retained must be copied first using sp_copy_port(). | |
293 | */ | |
d54e9004 | 294 | void sp_free_port_list(struct sp_port **ports); |
e96d8bd2 | 295 | |
091e75fe | 296 | /** |
cf9d365c UH |
297 | * @} |
298 | * @defgroup Ports Opening and closing ports | |
299 | * @{ | |
300 | */ | |
091e75fe | 301 | |
cd5f5281 | 302 | /** |
cf9d365c UH |
303 | * Open the specified serial port. |
304 | * | |
305 | * @param port Pointer to port structure. | |
306 | * @param flags Flags to use when opening the serial port. | |
307 | * | |
308 | * @return SP_OK on success, SP_ERR_FAIL on failure, SP_ERR_MEM on allocation | |
309 | * failure, or SP_ERR_ARG if an invalid port is passed. | |
310 | */ | |
eb6ed20f | 311 | enum sp_return sp_open(struct sp_port *port, enum sp_mode flags); |
cd5f5281 ML |
312 | |
313 | /** | |
cf9d365c UH |
314 | * Close the specified serial port. |
315 | * | |
316 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
317 | * if an invalid port is passed. | |
318 | */ | |
eb6ed20f | 319 | enum sp_return sp_close(struct sp_port *port); |
e96d8bd2 | 320 | |
cd5f5281 | 321 | /** |
cf9d365c UH |
322 | * @} |
323 | * @defgroup Configuration Setting port parameters | |
324 | * @{ | |
325 | */ | |
e96d8bd2 | 326 | |
cd5f5281 | 327 | /** |
cf9d365c UH |
328 | * Get the current configuration of the specified serial port. |
329 | * | |
330 | * The user should allocate a struct sp_port_config, then pass a pointer to it | |
331 | * as the config parameter. The struct will be populated with the port | |
332 | * configuration. | |
333 | * | |
334 | * Any setting that is in a state not recognised or supported by | |
335 | * libserialport will have its value set to -1 in the struct. | |
336 | * | |
337 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
338 | * for invalid arguments. | |
339 | */ | |
eb6ed20f | 340 | enum sp_return sp_get_config(struct sp_port *port, struct sp_port_config *config); |
cd5f5281 ML |
341 | |
342 | /** | |
cf9d365c UH |
343 | * Set the configuration for the specified serial port. |
344 | * | |
345 | * The user should populate a struct sp_port_config, then pass a pointer to it | |
346 | * as the config parameter. | |
347 | * | |
348 | * To retain the current value of any setting, set that field to -1. | |
349 | * | |
350 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
351 | * for invalid arguments. | |
352 | */ | |
eb6ed20f | 353 | enum sp_return sp_set_config(struct sp_port *port, const struct sp_port_config *config); |
cd5f5281 ML |
354 | |
355 | /** | |
cf9d365c UH |
356 | * Set the baud rate for the specified serial port. |
357 | * | |
358 | * @param port Pointer to port structure. | |
359 | * @param baudrate Baud rate in bits per second. | |
360 | * | |
361 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
362 | * for invalid arguments. | |
363 | */ | |
eb6ed20f | 364 | enum sp_return sp_set_baudrate(struct sp_port *port, int baudrate); |
cd5f5281 ML |
365 | |
366 | /** | |
cf9d365c UH |
367 | * Set the number of data bits for the specified serial port. |
368 | * | |
369 | * @param port Pointer to port structure. | |
370 | * @param bits Number of data bits to use. Valid values are 5 to 8. | |
371 | * | |
372 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
373 | * for invalid arguments. | |
374 | */ | |
eb6ed20f | 375 | enum sp_return sp_set_bits(struct sp_port *port, int bits); |
cd5f5281 ML |
376 | |
377 | /** | |
cf9d365c UH |
378 | * Set the parity for the specified serial port. |
379 | * | |
380 | * @param port Pointer to port structure. | |
381 | * @param parity Parity setting to use. | |
382 | * | |
383 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
384 | * for invalid arguments. | |
385 | */ | |
eb6ed20f | 386 | enum sp_return sp_set_parity(struct sp_port *port, enum sp_parity parity); |
cd5f5281 ML |
387 | |
388 | /** | |
cf9d365c UH |
389 | * Set the number of stop bits for the specified port. |
390 | * | |
391 | * @param port Pointer to port structure. | |
392 | * @param stopbits Number of stop bits to use (1 or 2). | |
393 | * | |
394 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
395 | * for invalid arguments. | |
396 | */ | |
eb6ed20f | 397 | enum sp_return sp_set_stopbits(struct sp_port *port, int stopbits); |
cd5f5281 ML |
398 | |
399 | /** | |
cf9d365c UH |
400 | * Set the flow control type for the specified serial port. |
401 | * | |
402 | * This function is a wrapper that sets the RTS, CTS, DTR, DSR and | |
403 | * XON/XOFF settings as necessary for the specified flow control | |
404 | * type. For more fine-grained control of these settings, use their | |
405 | * individual configuration functions or the sp_set_config() function. | |
406 | * | |
407 | * @param port Pointer to port structure. | |
408 | * @param flowcontrol Flow control setting to use. | |
409 | * | |
410 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
411 | * for invalid arguments. | |
412 | */ | |
eb6ed20f | 413 | enum sp_return sp_set_flowcontrol(struct sp_port *port, enum sp_flowcontrol flowcontrol); |
18fc2dd1 | 414 | |
cd5f5281 | 415 | /** |
cf9d365c UH |
416 | * Set the RTS pin behaviour for the specified port. |
417 | * | |
418 | * @param port Pointer to port structure. | |
419 | * @param rts RTS pin mode. | |
420 | * | |
421 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
422 | * for invalid arguments. | |
423 | */ | |
eb6ed20f | 424 | enum sp_return sp_set_rts(struct sp_port *port, enum sp_rts rts); |
cd5f5281 ML |
425 | |
426 | /** | |
cf9d365c UH |
427 | * Set the CTS pin behaviour for the specified port. |
428 | * | |
429 | * @param port Pointer to port structure. | |
430 | * @param cts CTS pin mode. | |
431 | * | |
432 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
433 | * for invalid arguments. | |
434 | */ | |
eb6ed20f | 435 | enum sp_return sp_set_cts(struct sp_port *port, enum sp_cts cts); |
cd5f5281 ML |
436 | |
437 | /** | |
cf9d365c UH |
438 | * Set the DTR pin behaviour for the specified port. |
439 | * | |
440 | * @param port Pointer to port structure. | |
441 | * @param dtr DTR pin mode. | |
442 | * | |
443 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
444 | * for invalid arguments. | |
445 | */ | |
eb6ed20f | 446 | enum sp_return sp_set_dtr(struct sp_port *port, enum sp_dtr dtr); |
cd5f5281 ML |
447 | |
448 | /** | |
cf9d365c UH |
449 | * Set the RTS pin behaviour for the specified port. |
450 | * | |
451 | * @param port Pointer to port structure. | |
452 | * @param dsr DSR pin mode. | |
453 | * | |
454 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
455 | * for invalid arguments. | |
456 | */ | |
eb6ed20f | 457 | enum sp_return sp_set_dsr(struct sp_port *port, enum sp_dsr dsr); |
cd5f5281 ML |
458 | |
459 | /** | |
cf9d365c UH |
460 | * Configure XON/XOFF flow control for the specified port. |
461 | * | |
462 | * @param port Pointer to port structure. | |
463 | * @param xon_xoff XON/XOFF flow control mode. | |
464 | * | |
465 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
466 | * for invalid arguments. | |
467 | */ | |
eb6ed20f | 468 | enum sp_return sp_set_xon_xoff(struct sp_port *port, enum sp_xonxoff xon_xoff); |
e96d8bd2 | 469 | |
091e75fe | 470 | /** |
cf9d365c UH |
471 | * @} |
472 | * @defgroup Data Reading, writing, and flushing data | |
473 | * @{ | |
091e75fe ML |
474 | */ |
475 | ||
476 | /** | |
cf9d365c UH |
477 | * Read bytes from the specified serial port. |
478 | * | |
479 | * Note that this function may return after reading less than the specified | |
480 | * number of bytes; it is the user's responsibility to iterate as necessary | |
481 | * in this case. | |
482 | * | |
483 | * @param port Pointer to port structure. | |
484 | * @param buf Buffer in which to store the bytes read. | |
485 | * @param count Maximum number of bytes to read. | |
486 | * | |
487 | * @return The number of bytes read, SP_ERR_FAIL on failure, | |
488 | * or SP_ERR_ARG for invalid arguments. | |
489 | */ | |
091e75fe ML |
490 | enum sp_return sp_read(struct sp_port *port, void *buf, size_t count); |
491 | ||
492 | /** | |
cf9d365c UH |
493 | * Write bytes to the specified serial port. |
494 | * | |
495 | * Note that this function may return after writing less than the specified | |
496 | * number of bytes; it is the user's responsibility to iterate as necessary | |
497 | * in this case. | |
498 | * | |
499 | * @param port Pointer to port structure. | |
500 | * @param buf Buffer containing the bytes to write. | |
501 | * @param count Maximum number of bytes to write. | |
502 | * | |
503 | * @return The number of bytes written, SP_ERR_FAIL on failure, | |
504 | * or SP_ERR_ARG for invalid arguments. | |
505 | */ | |
091e75fe ML |
506 | enum sp_return sp_write(struct sp_port *port, const void *buf, size_t count); |
507 | ||
508 | /** | |
cf9d365c UH |
509 | * Flush serial port buffers. |
510 | * | |
511 | * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG | |
512 | * if an invalid port is passed. | |
513 | */ | |
091e75fe ML |
514 | enum sp_return sp_flush(struct sp_port *port); |
515 | ||
516 | /** | |
cf9d365c UH |
517 | * @} |
518 | * @defgroup Errors Obtaining error information | |
519 | * @{ | |
091e75fe ML |
520 | */ |
521 | ||
cd5f5281 | 522 | /** |
cf9d365c UH |
523 | * Get the error code for a failed operation. |
524 | * | |
525 | * In order to obtain the correct result, this function should be called | |
526 | * straight after the failure, before executing any other system operations. | |
527 | * | |
528 | * @return The system's numeric code for the error that caused the last | |
529 | * operation to fail. | |
530 | */ | |
74510d4b | 531 | int sp_last_error_code(void); |
cd5f5281 ML |
532 | |
533 | /** | |
cf9d365c UH |
534 | * Get the error message for a failed operation. |
535 | * | |
536 | * In order to obtain the correct result, this function should be called | |
537 | * straight after the failure, before executing other system operations. | |
538 | * | |
539 | * @return The system's message for the error that caused the last | |
540 | * operation to fail. This string may be allocated by the function, | |
541 | * and should be freed after use by calling sp_free_error_message(). | |
542 | */ | |
74510d4b | 543 | char *sp_last_error_message(void); |
cd5f5281 ML |
544 | |
545 | /** | |
cf9d365c UH |
546 | * Free an error message returned by sp_last_error_message(). |
547 | */ | |
74510d4b | 548 | void sp_free_error_message(char *message); |
e8ffaee9 | 549 | |
cf9d365c | 550 | /** @} */ |
091e75fe | 551 | |
5ef8a1ed UH |
552 | #ifdef __cplusplus |
553 | } | |
554 | #endif | |
555 | ||
f92f1f0c | 556 | #endif /* LIBSERIALPORT_H */ |