2 * This file is part of the libsigrok project.
4 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
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.
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.
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/>.
22 SR_PRIV unsigned int get_memory_size(int type)
24 if (type == MEMORY_SIZE_8K)
26 else if (type <= MEMORY_SIZE_8M)
27 return (32 * 1024) << type;
32 SR_PRIV int clz(unsigned int x)
37 if (!(x & 0xFFFF0000)) {
41 if (!(x & 0xFF000000)) {
45 if (!(x & 0xF0000000)) {
49 if (!(x & 0xC0000000)) {
53 if (!(x & 0x80000000))
58 SR_PRIV int set_limit_samples(struct dev_context *devc, uint64_t samples)
60 if (samples > devc->max_sample_depth)
61 samples = devc->max_sample_depth;
63 devc->limit_samples = samples;
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;
70 devc->memory_size = 19 - clz(samples - 1);
72 sr_info("Setting memory size to %dK.",
73 get_memory_size(devc->memory_size) / 1024);
75 analyzer_set_memory_size(devc->memory_size);
80 SR_PRIV int set_capture_ratio(struct dev_context *devc, uint64_t ratio)
83 sr_err("Invalid capture ratio: %" PRIu64 ".", ratio);
87 devc->capture_ratio = ratio;
89 sr_info("Setting capture ratio to %d%%.", devc->capture_ratio);
94 SR_PRIV void set_triggerbar(struct dev_context *devc)
96 unsigned int trigger_depth, triggerbar, ramsize_trigger;
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;
103 ramsize_trigger = trigger_depth - triggerbar;
104 /* Matches USB packet captures from official app/driver */
108 ramsize_trigger -= 1;
112 analyzer_set_triggerbar_address(triggerbar);
113 analyzer_set_ramsize_trigger_address(ramsize_trigger);
115 sr_dbg("triggerbar_address = %d(0x%x)", triggerbar, triggerbar);
116 sr_dbg("ramsize_triggerbar_address = %d(0x%x)",
117 ramsize_trigger, ramsize_trigger);