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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 | * Copyright (C) 2014 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, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <glib.h> | |
24 | #include "libsigrok.h" | |
25 | #include "libsigrok-internal.h" | |
26 | ||
27 | #define LOG_PREFIX "output/chronovu-la8" | |
28 | ||
29 | struct context { | |
30 | unsigned int num_enabled_channels; | |
31 | gboolean triggered; | |
32 | uint64_t samplerate; | |
33 | uint64_t samplecount; | |
34 | int *channel_index; | |
35 | GString *pretrig_buf; | |
36 | }; | |
37 | ||
38 | /** | |
39 | * Check if the given samplerate is supported by the LA8 hardware. | |
40 | * | |
41 | * @param samplerate The samplerate (in Hz) to check. | |
42 | * | |
43 | * @return 1 if the samplerate is supported/valid, 0 otherwise. | |
44 | */ | |
45 | static gboolean is_valid_samplerate(uint64_t samplerate) | |
46 | { | |
47 | unsigned int i; | |
48 | ||
49 | for (i = 0; i < 255; i++) { | |
50 | if (samplerate == (SR_MHZ(100) / (i + 1))) | |
51 | return TRUE; | |
52 | } | |
53 | ||
54 | return FALSE; | |
55 | } | |
56 | ||
57 | /** | |
58 | * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants. | |
59 | * | |
60 | * LA8 hardware: sample period = (divcount + 1) * 10ns. | |
61 | * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate). | |
62 | * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate). | |
63 | * | |
64 | * @param samplerate The samplerate in Hz. | |
65 | * | |
66 | * @return The divcount value as needed by the hardware, or 0xff upon errors. | |
67 | */ | |
68 | static uint8_t samplerate_to_divcount(uint64_t samplerate) | |
69 | { | |
70 | if (samplerate == 0 || !is_valid_samplerate(samplerate)) { | |
71 | sr_warn("Invalid samplerate (%" PRIu64 "Hz)", samplerate); | |
72 | return 0xff; | |
73 | } | |
74 | ||
75 | return (SR_MHZ(100) / samplerate) - 1; | |
76 | } | |
77 | ||
78 | static int init(struct sr_output *o, GHashTable *options) | |
79 | { | |
80 | struct context *ctx; | |
81 | struct sr_channel *ch; | |
82 | GSList *l; | |
83 | ||
84 | (void)options; | |
85 | ||
86 | if (!o || !o->sdi) | |
87 | return SR_ERR_ARG; | |
88 | ||
89 | ctx = g_malloc0(sizeof(struct context)); | |
90 | o->priv = ctx; | |
91 | ||
92 | for (l = o->sdi->channels; l; l = l->next) { | |
93 | ch = l->data; | |
94 | if (ch->type != SR_CHANNEL_LOGIC) | |
95 | continue; | |
96 | if (!ch->enabled) | |
97 | continue; | |
98 | ctx->num_enabled_channels++; | |
99 | } | |
100 | ctx->channel_index = g_malloc(sizeof(int) * ctx->num_enabled_channels); | |
101 | ctx->pretrig_buf = g_string_sized_new(1024); | |
102 | ||
103 | return SR_OK; | |
104 | } | |
105 | ||
106 | static int receive(const struct sr_output *o, const struct sr_datafeed_packet *packet, | |
107 | GString **out) | |
108 | { | |
109 | const struct sr_datafeed_logic *logic; | |
110 | struct context *ctx; | |
111 | GVariant *gvar; | |
112 | uint64_t samplerate; | |
113 | gchar c[4]; | |
114 | ||
115 | *out = NULL; | |
116 | if (!o || !o->sdi) | |
117 | return SR_ERR_ARG; | |
118 | if (!(ctx = o->priv)) | |
119 | return SR_ERR_ARG; | |
120 | ||
121 | switch (packet->type) { | |
122 | case SR_DF_HEADER: | |
123 | /* One byte for the 'divcount' value. */ | |
124 | if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE, | |
125 | &gvar) == SR_OK) { | |
126 | samplerate = g_variant_get_uint64(gvar); | |
127 | g_variant_unref(gvar); | |
128 | } else | |
129 | samplerate = 0; | |
130 | c[0] = samplerate_to_divcount(samplerate); | |
131 | *out = g_string_new_len(c, 1); | |
132 | ctx->triggered = FALSE; | |
133 | break; | |
134 | case SR_DF_TRIGGER: | |
135 | /* Four bytes (little endian) for the trigger point. */ | |
136 | c[0] = ctx->samplecount & 0xff; | |
137 | c[1] = (ctx->samplecount >> 8) & 0xff; | |
138 | c[2] = (ctx->samplecount >> 16) & 0xff; | |
139 | c[3] = (ctx->samplecount >> 24) & 0xff; | |
140 | *out = g_string_new_len(c, 4); | |
141 | /* Flush the pre-trigger buffer. */ | |
142 | if (ctx->pretrig_buf->len) | |
143 | g_string_append_len(*out, ctx->pretrig_buf->str, | |
144 | ctx->pretrig_buf->len); | |
145 | ctx->triggered = TRUE; | |
146 | break; | |
147 | case SR_DF_LOGIC: | |
148 | logic = packet->payload; | |
149 | if (!ctx->triggered) | |
150 | g_string_append_len(ctx->pretrig_buf, logic->data, logic->length); | |
151 | else | |
152 | *out = g_string_new_len(logic->data, logic->length); | |
153 | ctx->samplecount += logic->length / logic->unitsize; | |
154 | break; | |
155 | case SR_DF_END: | |
156 | if (!ctx->triggered && ctx->pretrig_buf->len) { | |
157 | /* We never got a trigger, submit an empty one. */ | |
158 | *out = g_string_sized_new(ctx->pretrig_buf->len + 4); | |
159 | g_string_append_len(*out, "\x00\x00\x00\x00", 4); | |
160 | g_string_append_len(*out, ctx->pretrig_buf->str, ctx->pretrig_buf->len); | |
161 | } | |
162 | break; | |
163 | } | |
164 | ||
165 | return SR_OK; | |
166 | } | |
167 | ||
168 | static int cleanup(struct sr_output *o) | |
169 | { | |
170 | struct context *ctx; | |
171 | ||
172 | if (!o || !o->sdi) | |
173 | return SR_ERR_ARG; | |
174 | ||
175 | if (o->priv) { | |
176 | ctx = o->priv; | |
177 | g_string_free(ctx->pretrig_buf, TRUE); | |
178 | g_free(ctx->channel_index); | |
179 | g_free(o->priv); | |
180 | o->priv = NULL; | |
181 | } | |
182 | ||
183 | return SR_OK; | |
184 | } | |
185 | ||
186 | SR_PRIV struct sr_output_module output_chronovu_la8 = { | |
187 | .id = "chronovu-la8", | |
188 | .name = "ChronoVu LA8", | |
189 | .desc = "ChronoVu LA8 native file format", | |
190 | .exts = (const char*[]){"kdt", NULL}, | |
191 | .options = NULL, | |
192 | .init = init, | |
193 | .receive = receive, | |
194 | .cleanup = cleanup, | |
195 | }; |