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1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2015 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, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <string.h> | |
c1aae900 | 22 | #include <libsigrok/libsigrok.h> |
d74d30bb UH |
23 | #include "libsigrok-internal.h" |
24 | ||
25 | #define LOG_PREFIX "transform/invert" | |
26 | ||
27 | static int receive(const struct sr_transform *t, | |
28 | struct sr_datafeed_packet *packet_in, | |
29 | struct sr_datafeed_packet **packet_out) | |
30 | { | |
31 | const struct sr_datafeed_logic *logic; | |
32 | const struct sr_datafeed_analog *analog; | |
33 | struct sr_channel *ch; | |
34 | GSList *l; | |
35 | float *fdata, *f; | |
36 | int si, num_channels, c; | |
37 | uint8_t *b; | |
38 | uint64_t i, j; | |
39 | ||
40 | if (!t || !t->sdi || !packet_in || !packet_out) | |
41 | return SR_ERR_ARG; | |
42 | ||
43 | switch (packet_in->type) { | |
44 | case SR_DF_LOGIC: | |
45 | logic = packet_in->payload; | |
46 | for (i = 0; i <= logic->length - logic->unitsize; i += logic->unitsize) { | |
47 | for (j = 0; j < logic->unitsize; j++) { | |
48 | /* For now invert every bit in every byte. */ | |
49 | b = (uint8_t *)logic->data + i + logic->unitsize - 1 - j; | |
50 | *b = ~(*b); | |
51 | } | |
52 | } | |
53 | break; | |
54 | case SR_DF_ANALOG: | |
55 | analog = packet_in->payload; | |
56 | fdata = (float *)analog->data; | |
57 | num_channels = g_slist_length(analog->channels); | |
58 | for (si = 0; si < analog->num_samples; si++) { | |
59 | /* For now invert all values in all channels. */ | |
60 | for (l = analog->channels, c = 0; l; l = l->next, c++) { | |
61 | ch = l->data; | |
62 | (void)ch; | |
63 | f = &fdata[si * num_channels + c]; | |
64 | *f = 1.0 / *f; | |
65 | } | |
66 | } | |
67 | break; | |
68 | default: | |
69 | sr_spew("Unsupported packet type %d, ignoring.", packet_in->type); | |
70 | break; | |
71 | } | |
72 | ||
73 | /* Return the in-place-modified packet. */ | |
74 | *packet_out = packet_in; | |
75 | ||
76 | return SR_OK; | |
77 | } | |
78 | ||
79 | SR_PRIV struct sr_transform_module transform_invert = { | |
80 | .id = "invert", | |
81 | .name = "Invert", | |
82 | .desc = "Invert values", | |
83 | .options = NULL, | |
84 | .init = NULL, | |
85 | .receive = receive, | |
86 | .cleanup = NULL, | |
87 | }; |