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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com> | |
6 | * | |
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 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
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. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <glib.h> | |
25 | #include "config.h" /* Needed for PACKAGE and others. */ | |
26 | #include "libsigrok.h" | |
27 | #include "libsigrok-internal.h" | |
28 | ||
29 | struct context { | |
30 | int num_enabled_probes; | |
31 | int unitsize; | |
32 | char *probelist[SR_MAX_NUM_PROBES + 1]; | |
33 | int *prevbits; | |
34 | GString *header; | |
35 | uint64_t prevsample; | |
36 | int period; | |
37 | uint64_t samplerate; | |
38 | }; | |
39 | ||
40 | static const char *vcd_header_comment = "\ | |
41 | $comment\n Acquisition with %d/%d probes at %s\n$end\n"; | |
42 | ||
43 | static int init(struct sr_output *o) | |
44 | { | |
45 | struct context *ctx; | |
46 | struct sr_probe *probe; | |
47 | GSList *l; | |
48 | uint64_t *samplerate; | |
49 | int num_probes, i; | |
50 | char *samplerate_s, *frequency_s, *timestamp; | |
51 | time_t t; | |
52 | ||
53 | if (!(ctx = g_try_malloc0(sizeof(struct context)))) { | |
54 | sr_err("vcd out: %s: ctx malloc failed", __func__); | |
55 | return SR_ERR_MALLOC; | |
56 | } | |
57 | ||
58 | o->internal = ctx; | |
59 | ctx->num_enabled_probes = 0; | |
60 | ||
61 | for (l = o->sdi->probes; l; l = l->next) { | |
62 | probe = l->data; | |
63 | if (!probe->enabled) | |
64 | continue; | |
65 | ctx->probelist[ctx->num_enabled_probes++] = probe->name; | |
66 | } | |
67 | if (ctx->num_enabled_probes > 94) { | |
68 | sr_err("vcd out: VCD only supports 94 probes."); | |
69 | return SR_ERR; | |
70 | } | |
71 | ||
72 | ctx->probelist[ctx->num_enabled_probes] = 0; | |
73 | ctx->unitsize = (ctx->num_enabled_probes + 7) / 8; | |
74 | ctx->header = g_string_sized_new(512); | |
75 | num_probes = g_slist_length(o->sdi->probes); | |
76 | ||
77 | /* timestamp */ | |
78 | t = time(NULL); | |
79 | timestamp = g_strdup(ctime(&t)); | |
80 | timestamp[strlen(timestamp)-1] = 0; | |
81 | g_string_printf(ctx->header, "$date %s $end\n", timestamp); | |
82 | g_free(timestamp); | |
83 | ||
84 | /* generator */ | |
85 | g_string_append_printf(ctx->header, "$version %s %s $end\n", | |
86 | PACKAGE, PACKAGE_VERSION); | |
87 | ||
88 | if (o->sdi->driver && sr_dev_has_hwcap(o->sdi, SR_HWCAP_SAMPLERATE)) { | |
89 | o->sdi->driver->info_get(SR_DI_CUR_SAMPLERATE, | |
90 | (const void **)&samplerate, o->sdi); | |
91 | ctx->samplerate = *samplerate; | |
92 | if (!((samplerate_s = sr_samplerate_string(ctx->samplerate)))) { | |
93 | g_string_free(ctx->header, TRUE); | |
94 | g_free(ctx); | |
95 | return SR_ERR; | |
96 | } | |
97 | g_string_append_printf(ctx->header, vcd_header_comment, | |
98 | ctx->num_enabled_probes, num_probes, samplerate_s); | |
99 | g_free(samplerate_s); | |
100 | } | |
101 | ||
102 | /* timescale */ | |
103 | /* VCD can only handle 1/10/100 (s - fs), so scale up first */ | |
104 | if (ctx->samplerate > SR_MHZ(1)) | |
105 | ctx->period = SR_GHZ(1); | |
106 | else if (ctx->samplerate > SR_KHZ(1)) | |
107 | ctx->period = SR_MHZ(1); | |
108 | else | |
109 | ctx->period = SR_KHZ(1); | |
110 | if (!(frequency_s = sr_period_string(ctx->period))) { | |
111 | g_string_free(ctx->header, TRUE); | |
112 | g_free(ctx); | |
113 | return SR_ERR; | |
114 | } | |
115 | g_string_append_printf(ctx->header, "$timescale %s $end\n", frequency_s); | |
116 | g_free(frequency_s); | |
117 | ||
118 | /* scope */ | |
119 | g_string_append_printf(ctx->header, "$scope module %s $end\n", PACKAGE); | |
120 | ||
121 | /* Wires / channels */ | |
122 | for (i = 0; i < ctx->num_enabled_probes; i++) { | |
123 | g_string_append_printf(ctx->header, "$var wire 1 %c %s $end\n", | |
124 | (char)('!' + i), ctx->probelist[i]); | |
125 | } | |
126 | ||
127 | g_string_append(ctx->header, "$upscope $end\n" | |
128 | "$enddefinitions $end\n$dumpvars\n"); | |
129 | ||
130 | if (!(ctx->prevbits = g_try_malloc0(sizeof(int) * num_probes))) { | |
131 | g_string_free(ctx->header, TRUE); | |
132 | g_free(ctx); | |
133 | sr_err("vcd out: %s: ctx->prevbits malloc failed", __func__); | |
134 | return SR_ERR_MALLOC; | |
135 | } | |
136 | ||
137 | return SR_OK; | |
138 | } | |
139 | ||
140 | static int event(struct sr_output *o, int event_type, uint8_t **data_out, | |
141 | uint64_t *length_out) | |
142 | { | |
143 | uint8_t *outbuf; | |
144 | ||
145 | switch (event_type) { | |
146 | case SR_DF_END: | |
147 | outbuf = (uint8_t *)g_strdup("$dumpoff\n$end\n"); | |
148 | *data_out = outbuf; | |
149 | *length_out = strlen((const char *)outbuf); | |
150 | g_free(o->internal); | |
151 | o->internal = NULL; | |
152 | break; | |
153 | default: | |
154 | *data_out = NULL; | |
155 | *length_out = 0; | |
156 | break; | |
157 | } | |
158 | ||
159 | return SR_OK; | |
160 | } | |
161 | ||
162 | static int data(struct sr_output *o, const uint8_t *data_in, | |
163 | uint64_t length_in, uint8_t **data_out, uint64_t *length_out) | |
164 | { | |
165 | struct context *ctx; | |
166 | unsigned int i; | |
167 | int p, curbit, prevbit; | |
168 | uint64_t sample; | |
169 | static uint64_t samplecount = 0; | |
170 | GString *out; | |
171 | int first_sample = 0; | |
172 | ||
173 | ctx = o->internal; | |
174 | out = g_string_sized_new(512); | |
175 | ||
176 | if (ctx->header) { | |
177 | /* The header is still here, this must be the first packet. */ | |
178 | g_string_append(out, ctx->header->str); | |
179 | g_string_free(ctx->header, TRUE); | |
180 | ctx->header = NULL; | |
181 | first_sample = 1; | |
182 | } | |
183 | ||
184 | for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) { | |
185 | samplecount++; | |
186 | ||
187 | memcpy(&sample, data_in + i, ctx->unitsize); | |
188 | ||
189 | if (first_sample) { | |
190 | /* First packet. We neg to make sure sample is stored. */ | |
191 | ctx->prevsample = ~sample; | |
192 | first_sample = 0; | |
193 | } | |
194 | ||
195 | for (p = 0; p < ctx->num_enabled_probes; p++) { | |
196 | curbit = (sample & ((uint64_t) (1 << p))) >> p; | |
197 | prevbit = (ctx->prevsample & ((uint64_t) (1 << p))) >> p; | |
198 | ||
199 | /* VCD only contains deltas/changes of signals. */ | |
200 | if (prevbit == curbit) | |
201 | continue; | |
202 | ||
203 | /* Output which signal changed to which value. */ | |
204 | g_string_append_printf(out, "#%" PRIu64 "\n%i%c\n", | |
205 | (uint64_t)(((float)samplecount / ctx->samplerate) | |
206 | * ctx->period), curbit, (char)('!' + p)); | |
207 | } | |
208 | ||
209 | ctx->prevsample = sample; | |
210 | } | |
211 | ||
212 | *data_out = (uint8_t *)out->str; | |
213 | *length_out = out->len; | |
214 | g_string_free(out, FALSE); | |
215 | ||
216 | return SR_OK; | |
217 | } | |
218 | ||
219 | struct sr_output_format output_vcd = { | |
220 | .id = "vcd", | |
221 | .description = "Value Change Dump (VCD)", | |
222 | .df_type = SR_DF_LOGIC, | |
223 | .init = init, | |
224 | .data = data, | |
225 | .event = event, | |
226 | }; |