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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (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 General Public License | |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <config.h> | |
21 | #include <stdlib.h> | |
22 | #include <fcntl.h> | |
23 | #include <unistd.h> | |
24 | #include <sys/stat.h> | |
25 | #include <libsigrok/libsigrok.h> | |
26 | #include "libsigrok-internal.h" | |
27 | ||
28 | #define LOG_PREFIX "input/chronovu-la8" | |
29 | ||
30 | #define DEFAULT_NUM_CHANNELS 8 | |
31 | #define DEFAULT_SAMPLERATE SR_MHZ(100) | |
32 | #define CHUNK_SIZE (4 * 1024 * 1024) | |
33 | #define CHRONOVU_LA8_FILESIZE ((8 * 1024 * 1024) + 5) | |
34 | ||
35 | struct context { | |
36 | gboolean started; | |
37 | uint64_t samplerate; | |
38 | }; | |
39 | ||
40 | static int format_match(GHashTable *metadata, unsigned int *confidence) | |
41 | { | |
42 | int size; | |
43 | ||
44 | /* | |
45 | * In the absence of a reliable condition like magic strings, | |
46 | * we can only guess based on the file size. Since this is | |
47 | * rather weak a condition, signal "little confidence" and | |
48 | * optionally give precedence to better matches. | |
49 | */ | |
50 | size = GPOINTER_TO_INT(g_hash_table_lookup(metadata, | |
51 | GINT_TO_POINTER(SR_INPUT_META_FILESIZE))); | |
52 | if (size != CHRONOVU_LA8_FILESIZE) | |
53 | return SR_ERR; | |
54 | *confidence = 100; | |
55 | ||
56 | return SR_OK; | |
57 | } | |
58 | ||
59 | static int init(struct sr_input *in, GHashTable *options) | |
60 | { | |
61 | struct context *inc; | |
62 | int num_channels, i; | |
63 | char name[16]; | |
64 | ||
65 | num_channels = g_variant_get_int32(g_hash_table_lookup(options, "numchannels")); | |
66 | if (num_channels < 1) { | |
67 | sr_err("Invalid value for numchannels: must be at least 1."); | |
68 | return SR_ERR_ARG; | |
69 | } | |
70 | ||
71 | in->sdi = g_malloc0(sizeof(struct sr_dev_inst)); | |
72 | in->priv = inc = g_malloc0(sizeof(struct context)); | |
73 | ||
74 | inc->samplerate = g_variant_get_uint64(g_hash_table_lookup(options, "samplerate")); | |
75 | ||
76 | for (i = 0; i < num_channels; i++) { | |
77 | snprintf(name, sizeof(name), "%d", i); | |
78 | sr_channel_new(in->sdi, i, SR_CHANNEL_LOGIC, TRUE, name); | |
79 | } | |
80 | ||
81 | return SR_OK; | |
82 | } | |
83 | ||
84 | static int process_buffer(struct sr_input *in) | |
85 | { | |
86 | struct sr_datafeed_packet packet; | |
87 | struct sr_datafeed_meta meta; | |
88 | struct sr_datafeed_logic logic; | |
89 | struct sr_config *src; | |
90 | struct context *inc; | |
91 | gsize chunk_size, i; | |
92 | int chunk; | |
93 | ||
94 | inc = in->priv; | |
95 | if (!inc->started) { | |
96 | std_session_send_df_header(in->sdi); | |
97 | ||
98 | if (inc->samplerate) { | |
99 | packet.type = SR_DF_META; | |
100 | packet.payload = &meta; | |
101 | src = sr_config_new(SR_CONF_SAMPLERATE, g_variant_new_uint64(inc->samplerate)); | |
102 | meta.config = g_slist_append(NULL, src); | |
103 | sr_session_send(in->sdi, &packet); | |
104 | g_slist_free(meta.config); | |
105 | sr_config_free(src); | |
106 | } | |
107 | ||
108 | inc->started = TRUE; | |
109 | } | |
110 | ||
111 | packet.type = SR_DF_LOGIC; | |
112 | packet.payload = &logic; | |
113 | logic.unitsize = (g_slist_length(in->sdi->channels) + 7) / 8; | |
114 | ||
115 | /* Cut off at multiple of unitsize. */ | |
116 | chunk_size = in->buf->len / logic.unitsize * logic.unitsize; | |
117 | ||
118 | for (i = 0; i < chunk_size; i += chunk) { | |
119 | logic.data = in->buf->str + i; | |
120 | chunk = MIN(CHUNK_SIZE, chunk_size - i); | |
121 | logic.length = chunk; | |
122 | sr_session_send(in->sdi, &packet); | |
123 | } | |
124 | g_string_erase(in->buf, 0, chunk_size); | |
125 | ||
126 | return SR_OK; | |
127 | } | |
128 | ||
129 | static int receive(struct sr_input *in, GString *buf) | |
130 | { | |
131 | int ret; | |
132 | ||
133 | g_string_append_len(in->buf, buf->str, buf->len); | |
134 | ||
135 | if (!in->sdi_ready) { | |
136 | /* sdi is ready, notify frontend. */ | |
137 | in->sdi_ready = TRUE; | |
138 | return SR_OK; | |
139 | } | |
140 | ||
141 | ret = process_buffer(in); | |
142 | ||
143 | return ret; | |
144 | } | |
145 | ||
146 | static int end(struct sr_input *in) | |
147 | { | |
148 | struct context *inc; | |
149 | int ret; | |
150 | ||
151 | if (in->sdi_ready) | |
152 | ret = process_buffer(in); | |
153 | else | |
154 | ret = SR_OK; | |
155 | ||
156 | inc = in->priv; | |
157 | if (inc->started) | |
158 | std_session_send_df_end(in->sdi); | |
159 | ||
160 | return ret; | |
161 | } | |
162 | ||
163 | static int reset(struct sr_input *in) | |
164 | { | |
165 | struct context *inc = in->priv; | |
166 | ||
167 | inc->started = FALSE; | |
168 | g_string_truncate(in->buf, 0); | |
169 | ||
170 | return SR_OK; | |
171 | } | |
172 | ||
173 | static struct sr_option options[] = { | |
174 | { "numchannels", "Number of logic channels", "The number of (logic) channels in the data", NULL, NULL }, | |
175 | { "samplerate", "Sample rate (Hz)", "The sample rate of the (logic) data in Hz", NULL, NULL }, | |
176 | ALL_ZERO | |
177 | }; | |
178 | ||
179 | static const struct sr_option *get_options(void) | |
180 | { | |
181 | if (!options[0].def) { | |
182 | options[0].def = g_variant_ref_sink(g_variant_new_int32(DEFAULT_NUM_CHANNELS)); | |
183 | options[1].def = g_variant_ref_sink(g_variant_new_uint64(DEFAULT_SAMPLERATE)); | |
184 | } | |
185 | ||
186 | return options; | |
187 | } | |
188 | ||
189 | SR_PRIV struct sr_input_module input_chronovu_la8 = { | |
190 | .id = "chronovu-la8", | |
191 | .name = "ChronoVu LA8", | |
192 | .desc = "ChronoVu LA8 native file format data", | |
193 | .exts = (const char*[]){"kdt", NULL}, | |
194 | .metadata = { SR_INPUT_META_FILESIZE | SR_INPUT_META_REQUIRED }, | |
195 | .options = get_options, | |
196 | .format_match = format_match, | |
197 | .init = init, | |
198 | .receive = receive, | |
199 | .end = end, | |
200 | .reset = reset, | |
201 | }; |