2 * This file is part of the sigrok project.
4 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
5 * Copyright (C) 2012 Peter Stuge <peter@stuge.se>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include "libsigrok.h"
23 #include "libsigrok-internal.h"
26 * @mainpage libsigrok API
28 * @section sec_intro Introduction
30 * The <a href="http://sigrok.org">sigrok</a> project aims at creating a
31 * portable, cross-platform, Free/Libre/Open-Source signal analysis software
32 * suite that supports various device types (such as logic analyzers,
33 * oscilloscopes, multimeters, and more).
35 * <a href="http://sigrok.org/wiki/Libsigrok">libsigrok</a> is a shared
36 * library written in C which provides the basic API for talking to
37 * <a href="http://sigrok.org/wiki/Supported_hardware">supported hardware</a>
38 * and reading/writing the acquired data into various
39 * <a href="http://sigrok.org/wiki/Input_output_formats">input/output
42 * @section sec_error_handling Error handling
44 * libsigrok functions usually return @ref SR_OK upon success, or a negative
45 * error code on failure.
47 * @section sec_mailinglists Mailing lists
49 * There are two mailing lists for sigrok/libsigrok: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a> and <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-commits">sigrok-commits</a>.
51 * @section sec_irc IRC
53 * You can find the sigrok developers in the
54 * <a href="irc://chat.freenode.net/sigrok">\#sigrok</a>
55 * IRC channel on Freenode.
57 * @section sec_website Website
59 * <a href="http://sigrok.org/wiki/Libsigrok">sigrok.org/wiki/Libsigrok</a>
63 * Initialize libsigrok.
65 * This function must be called before any other libsigrok function.
67 * @param ctx Pointer to a libsigrok context struct pointer. Must not be NULL.
68 * This will be a pointer to a newly allocated libsigrok context
69 * object upon success, and is undefined upon errors.
71 * @return SR_OK upon success, a (negative) error code otherwise. Upon errors
72 * the 'ctx' pointer is undefined and should not be used. Upon success,
73 * the context will be free'd by sr_exit() as part of the libsigrok
76 SR_API int sr_init(struct sr_context **ctx)
79 struct sr_context *context;
82 sr_err("%s(): libsigrok context was NULL.", __func__);
86 /* + 1 to handle when struct sr_context has no members. */
87 context = g_try_malloc0(sizeof(struct sr_context) + 1);
94 #ifdef HAVE_LIBUSB_1_0
95 ret = libusb_init(&context->libusb_ctx);
96 if (LIBUSB_SUCCESS != ret) {
97 sr_err("libusb_init() returned %s.\n", libusb_error_name(ret));
110 * Shutdown libsigrok.
112 * @param ctx Pointer to a libsigrok context struct. Must not be NULL.
114 * @return SR_OK upon success, a (negative) error code otherwise.
116 SR_API int sr_exit(struct sr_context *ctx)
119 sr_err("%s(): libsigrok context was NULL.", __func__);
125 #ifdef HAVE_LIBUSB_1_0
126 libusb_exit(ctx->libusb_ctx);