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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 "protocol.h" | |
21 | ||
22 | SR_PRIV unsigned int get_memory_size(int type) | |
23 | { | |
24 | if (type == MEMORY_SIZE_8K) | |
25 | return 8 * 1024; | |
26 | else if (type <= MEMORY_SIZE_8M) | |
27 | return (32 * 1024) << type; | |
28 | else | |
29 | return 0; | |
30 | } | |
31 | ||
32 | SR_PRIV int clz(unsigned int x) | |
33 | { | |
34 | int n = 0; | |
35 | if (x == 0) | |
36 | return 32; | |
37 | if (!(x & 0xFFFF0000)) { | |
38 | n = n + 16; | |
39 | x = x << 16; | |
40 | } | |
41 | if (!(x & 0xFF000000)) { | |
42 | n = n + 8; | |
43 | x = x << 8; | |
44 | } | |
45 | if (!(x & 0xF0000000)) { | |
46 | n = n + 4; | |
47 | x = x << 4; | |
48 | } | |
49 | if (!(x & 0xC0000000)) { | |
50 | n = n + 2; | |
51 | x = x << 2; | |
52 | } | |
53 | if (!(x & 0x80000000)) | |
54 | n = n + 1; | |
55 | return n; | |
56 | } | |
57 | ||
58 | SR_PRIV int set_limit_samples(struct dev_context *devc, uint64_t samples) | |
59 | { | |
60 | if (samples > devc->max_sample_depth) | |
61 | samples = devc->max_sample_depth; | |
62 | ||
63 | devc->limit_samples = samples; | |
64 | ||
65 | if (samples <= 2 * 1024) | |
66 | devc->memory_size = MEMORY_SIZE_8K; | |
67 | else if (samples <= 16 * 1024) | |
68 | devc->memory_size = MEMORY_SIZE_64K; | |
69 | else | |
70 | devc->memory_size = 19 - clz(samples - 1); | |
71 | ||
72 | sr_info("Setting memory size to %dK.", | |
73 | get_memory_size(devc->memory_size) / 1024); | |
74 | ||
75 | analyzer_set_memory_size(devc->memory_size); | |
76 | ||
77 | return SR_OK; | |
78 | } | |
79 | ||
80 | SR_PRIV int set_capture_ratio(struct dev_context *devc, uint64_t ratio) | |
81 | { | |
82 | if (ratio > 100) { | |
83 | sr_err("Invalid capture ratio: %" PRIu64 ".", ratio); | |
84 | return SR_ERR_ARG; | |
85 | } | |
86 | ||
87 | devc->capture_ratio = ratio; | |
88 | ||
89 | sr_info("Setting capture ratio to %d%%.", devc->capture_ratio); | |
90 | ||
91 | return SR_OK; | |
92 | } | |
93 | ||
94 | SR_PRIV void set_triggerbar(struct dev_context *devc) | |
95 | { | |
96 | unsigned int trigger_depth, triggerbar, ramsize_trigger; | |
97 | ||
98 | trigger_depth = get_memory_size(devc->memory_size) / 4; | |
99 | if (devc->limit_samples < trigger_depth) | |
100 | trigger_depth = devc->limit_samples; | |
101 | triggerbar = trigger_depth * devc->capture_ratio / 100; | |
102 | ||
103 | ramsize_trigger = trigger_depth - triggerbar; | |
104 | /* Matches USB packet captures from official app/driver */ | |
105 | if (triggerbar > 2) | |
106 | triggerbar -= 2; | |
107 | else { | |
108 | ramsize_trigger -= 1; | |
109 | triggerbar = 0; | |
110 | } | |
111 | ||
112 | analyzer_set_triggerbar_address(triggerbar); | |
113 | analyzer_set_ramsize_trigger_address(ramsize_trigger); | |
114 | ||
115 | sr_dbg("triggerbar_address = %d(0x%x)", triggerbar, triggerbar); | |
116 | sr_dbg("ramsize_triggerbar_address = %d(0x%x)", | |
117 | ramsize_trigger, ramsize_trigger); | |
118 | } |