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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com> | |
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 3 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 <math.h> | |
22 | #include "protocol.h" | |
23 | ||
24 | SR_PRIV size_t get_memory_size(int type) | |
25 | { | |
26 | if (type == MEMORY_SIZE_8K) | |
27 | return (8 * 1024); | |
28 | if (type <= MEMORY_SIZE_8M) | |
29 | return (32 * 1024) << type; | |
30 | return 0; | |
31 | } | |
32 | ||
33 | static int clz(unsigned int x) | |
34 | { | |
35 | int n = 0; | |
36 | if (x == 0) | |
37 | return 32; | |
38 | if (!(x & 0xFFFF0000)) { | |
39 | n = n + 16; | |
40 | x = x << 16; | |
41 | } | |
42 | if (!(x & 0xFF000000)) { | |
43 | n = n + 8; | |
44 | x = x << 8; | |
45 | } | |
46 | if (!(x & 0xF0000000)) { | |
47 | n = n + 4; | |
48 | x = x << 4; | |
49 | } | |
50 | if (!(x & 0xC0000000)) { | |
51 | n = n + 2; | |
52 | x = x << 2; | |
53 | } | |
54 | if (!(x & 0x80000000)) | |
55 | n = n + 1; | |
56 | return n; | |
57 | } | |
58 | ||
59 | SR_PRIV int set_limit_samples(struct dev_context *devc, uint64_t samples) | |
60 | { | |
61 | size_t mem_kb; | |
62 | ||
63 | if (samples > devc->max_sample_depth) | |
64 | samples = devc->max_sample_depth; | |
65 | ||
66 | devc->limit_samples = samples; | |
67 | ||
68 | if (samples <= (2 * 1024)) | |
69 | devc->memory_size = MEMORY_SIZE_8K; | |
70 | else if (samples <= (16 * 1024)) | |
71 | devc->memory_size = MEMORY_SIZE_64K; | |
72 | else | |
73 | devc->memory_size = 19 - clz(samples - 1); | |
74 | ||
75 | mem_kb = get_memory_size(devc->memory_size) / 1024; | |
76 | sr_info("Setting memory size to %zuK.", mem_kb); | |
77 | ||
78 | analyzer_set_memory_size(devc->memory_size); | |
79 | ||
80 | return SR_OK; | |
81 | } | |
82 | ||
83 | SR_PRIV int set_voltage_threshold(struct dev_context *devc, double thresh) | |
84 | { | |
85 | if (thresh > 6.0) | |
86 | thresh = 6.0; | |
87 | if (thresh < -6.0) | |
88 | thresh = -6.0; | |
89 | ||
90 | devc->cur_threshold = thresh; | |
91 | ||
92 | analyzer_set_voltage_threshold((int) round(-9.1*thresh + 62.6)); | |
93 | ||
94 | sr_info("Setting voltage threshold to %fV.", devc->cur_threshold); | |
95 | ||
96 | return SR_OK; | |
97 | } | |
98 | ||
99 | SR_PRIV void set_triggerbar(struct dev_context *devc) | |
100 | { | |
101 | unsigned int trigger_depth, triggerbar, ramsize_trigger; | |
102 | ||
103 | trigger_depth = get_memory_size(devc->memory_size) / 4; | |
104 | if (devc->limit_samples < trigger_depth) | |
105 | trigger_depth = devc->limit_samples; | |
106 | ||
107 | if (devc->trigger) | |
108 | triggerbar = (trigger_depth * devc->capture_ratio) / 100; | |
109 | else | |
110 | triggerbar = 0; | |
111 | ||
112 | ramsize_trigger = trigger_depth - triggerbar; | |
113 | /* Matches USB packet captures from official app/driver */ | |
114 | if (triggerbar > 2) | |
115 | triggerbar -= 2; | |
116 | else { | |
117 | ramsize_trigger -= 1; | |
118 | triggerbar = 0; | |
119 | } | |
120 | ||
121 | analyzer_set_triggerbar_address(triggerbar); | |
122 | analyzer_set_ramsize_trigger_address(ramsize_trigger); | |
123 | ||
124 | sr_dbg("triggerbar_address = %d(0x%x)", triggerbar, triggerbar); | |
125 | sr_dbg("ramsize_triggerbar_address = %d(0x%x)", | |
126 | ramsize_trigger, ramsize_trigger); | |
127 | } |