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8c48f179 | 1 | /* |
50985c20 | 2 | * This file is part of the libsigrok project. |
8c48f179 UH |
3 | * |
4 | * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de> | |
44559b2c | 5 | * Copyright (C) 2014 Bert Vermeulen <bert@biot.com> |
8c48f179 UH |
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 | |
44559b2c | 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
8c48f179 UH |
19 | */ |
20 | ||
6ec6c43b | 21 | #include <config.h> |
8c48f179 UH |
22 | #include <stdlib.h> |
23 | #include <string.h> | |
24 | #include <glib.h> | |
c1aae900 | 25 | #include <libsigrok/libsigrok.h> |
45c59c8b | 26 | #include "libsigrok-internal.h" |
8c48f179 | 27 | |
3544f848 | 28 | #define LOG_PREFIX "output/chronovu-la8" |
a944a84b | 29 | |
8c48f179 | 30 | struct context { |
ba7dd8bb | 31 | unsigned int num_enabled_channels; |
d42eb9d8 | 32 | gboolean triggered; |
8c48f179 | 33 | uint64_t samplerate; |
d42eb9d8 BV |
34 | uint64_t samplecount; |
35 | int *channel_index; | |
36 | GString *pretrig_buf; | |
8c48f179 UH |
37 | }; |
38 | ||
39 | /** | |
40 | * Check if the given samplerate is supported by the LA8 hardware. | |
41 | * | |
42 | * @param samplerate The samplerate (in Hz) to check. | |
44dae539 | 43 | * |
8c48f179 UH |
44 | * @return 1 if the samplerate is supported/valid, 0 otherwise. |
45 | */ | |
d42eb9d8 | 46 | static gboolean is_valid_samplerate(uint64_t samplerate) |
8c48f179 UH |
47 | { |
48 | unsigned int i; | |
49 | ||
50 | for (i = 0; i < 255; i++) { | |
51 | if (samplerate == (SR_MHZ(100) / (i + 1))) | |
d42eb9d8 | 52 | return TRUE; |
8c48f179 UH |
53 | } |
54 | ||
d42eb9d8 | 55 | return FALSE; |
8c48f179 UH |
56 | } |
57 | ||
58 | /** | |
59 | * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants. | |
60 | * | |
61 | * LA8 hardware: sample period = (divcount + 1) * 10ns. | |
62 | * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate). | |
63 | * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate). | |
64 | * | |
65 | * @param samplerate The samplerate in Hz. | |
44dae539 | 66 | * |
8c48f179 UH |
67 | * @return The divcount value as needed by the hardware, or 0xff upon errors. |
68 | */ | |
69 | static uint8_t samplerate_to_divcount(uint64_t samplerate) | |
70 | { | |
d42eb9d8 BV |
71 | if (samplerate == 0 || !is_valid_samplerate(samplerate)) { |
72 | sr_warn("Invalid samplerate (%" PRIu64 "Hz)", samplerate); | |
8c48f179 UH |
73 | return 0xff; |
74 | } | |
75 | ||
76 | return (SR_MHZ(100) / samplerate) - 1; | |
77 | } | |
78 | ||
a755b0e1 | 79 | static int init(struct sr_output *o, GHashTable *options) |
8c48f179 UH |
80 | { |
81 | struct context *ctx; | |
ba7dd8bb | 82 | struct sr_channel *ch; |
8c48f179 | 83 | GSList *l; |
8c48f179 | 84 | |
a755b0e1 BV |
85 | (void)options; |
86 | ||
d42eb9d8 | 87 | if (!o || !o->sdi) |
8c48f179 | 88 | return SR_ERR_ARG; |
8c48f179 | 89 | |
d42eb9d8 | 90 | ctx = g_malloc0(sizeof(struct context)); |
d686c5ec | 91 | o->priv = ctx; |
8c48f179 | 92 | |
ba7dd8bb UH |
93 | for (l = o->sdi->channels; l; l = l->next) { |
94 | ch = l->data; | |
3f239f08 | 95 | if (ch->type != SR_CHANNEL_LOGIC) |
3699a8a1 | 96 | continue; |
ba7dd8bb | 97 | if (!ch->enabled) |
8c48f179 | 98 | continue; |
ba7dd8bb | 99 | ctx->num_enabled_channels++; |
8c48f179 | 100 | } |
d42eb9d8 BV |
101 | ctx->channel_index = g_malloc(sizeof(int) * ctx->num_enabled_channels); |
102 | ctx->pretrig_buf = g_string_sized_new(1024); | |
8c48f179 | 103 | |
5c3c1241 | 104 | return SR_OK; |
8c48f179 UH |
105 | } |
106 | ||
a755b0e1 | 107 | static int receive(const struct sr_output *o, const struct sr_datafeed_packet *packet, |
dba3e682 | 108 | GString **out) |
8c48f179 | 109 | { |
d42eb9d8 | 110 | const struct sr_datafeed_logic *logic; |
8c48f179 | 111 | struct context *ctx; |
d42eb9d8 BV |
112 | GVariant *gvar; |
113 | uint64_t samplerate; | |
114 | gchar c[4]; | |
8c48f179 | 115 | |
d42eb9d8 BV |
116 | *out = NULL; |
117 | if (!o || !o->sdi) | |
8c48f179 | 118 | return SR_ERR_ARG; |
d686c5ec | 119 | if (!(ctx = o->priv)) |
8c48f179 | 120 | return SR_ERR_ARG; |
8c48f179 | 121 | |
d42eb9d8 BV |
122 | switch (packet->type) { |
123 | case SR_DF_HEADER: | |
124 | /* One byte for the 'divcount' value. */ | |
125 | if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE, | |
126 | &gvar) == SR_OK) { | |
127 | samplerate = g_variant_get_uint64(gvar); | |
128 | g_variant_unref(gvar); | |
129 | } else | |
130 | samplerate = 0; | |
131 | c[0] = samplerate_to_divcount(samplerate); | |
132 | *out = g_string_new_len(c, 1); | |
133 | ctx->triggered = FALSE; | |
134 | break; | |
8c48f179 | 135 | case SR_DF_TRIGGER: |
d42eb9d8 BV |
136 | /* Four bytes (little endian) for the trigger point. */ |
137 | c[0] = ctx->samplecount & 0xff; | |
138 | c[1] = (ctx->samplecount >> 8) & 0xff; | |
139 | c[2] = (ctx->samplecount >> 16) & 0xff; | |
140 | c[3] = (ctx->samplecount >> 24) & 0xff; | |
141 | *out = g_string_new_len(c, 4); | |
142 | /* Flush the pre-trigger buffer. */ | |
143 | if (ctx->pretrig_buf->len) | |
144 | g_string_append_len(*out, ctx->pretrig_buf->str, | |
145 | ctx->pretrig_buf->len); | |
146 | ctx->triggered = TRUE; | |
147 | break; | |
148 | case SR_DF_LOGIC: | |
149 | logic = packet->payload; | |
150 | if (!ctx->triggered) | |
151 | g_string_append_len(ctx->pretrig_buf, logic->data, logic->length); | |
152 | else | |
153 | *out = g_string_new_len(logic->data, logic->length); | |
154 | ctx->samplecount += logic->length / logic->unitsize; | |
8c48f179 UH |
155 | break; |
156 | case SR_DF_END: | |
d42eb9d8 BV |
157 | if (!ctx->triggered && ctx->pretrig_buf->len) { |
158 | /* We never got a trigger, submit an empty one. */ | |
159 | *out = g_string_sized_new(ctx->pretrig_buf->len + 4); | |
160 | g_string_append_len(*out, "\x00\x00\x00\x00", 4); | |
161 | g_string_append_len(*out, ctx->pretrig_buf->str, ctx->pretrig_buf->len); | |
8c48f179 | 162 | } |
8c48f179 UH |
163 | break; |
164 | } | |
165 | ||
166 | return SR_OK; | |
167 | } | |
168 | ||
d42eb9d8 | 169 | static int cleanup(struct sr_output *o) |
8c48f179 UH |
170 | { |
171 | struct context *ctx; | |
8c48f179 | 172 | |
d42eb9d8 | 173 | if (!o || !o->sdi) |
8c48f179 | 174 | return SR_ERR_ARG; |
8c48f179 | 175 | |
d686c5ec BV |
176 | if (o->priv) { |
177 | ctx = o->priv; | |
d42eb9d8 BV |
178 | g_string_free(ctx->pretrig_buf, TRUE); |
179 | g_free(ctx->channel_index); | |
d686c5ec BV |
180 | g_free(o->priv); |
181 | o->priv = NULL; | |
8c48f179 UH |
182 | } |
183 | ||
8c48f179 UH |
184 | return SR_OK; |
185 | } | |
186 | ||
a755b0e1 | 187 | SR_PRIV struct sr_output_module output_chronovu_la8 = { |
8c48f179 | 188 | .id = "chronovu-la8", |
a755b0e1 | 189 | .name = "ChronoVu LA8", |
8cd15dd4 | 190 | .desc = "ChronoVu LA8 native file format data", |
8a174d23 | 191 | .exts = (const char*[]){"kdt", NULL}, |
3cd4b381 | 192 | .flags = 0, |
a755b0e1 | 193 | .options = NULL, |
8c48f179 | 194 | .init = init, |
d42eb9d8 BV |
195 | .receive = receive, |
196 | .cleanup = cleanup, | |
8c48f179 | 197 | }; |