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/>.
24 SR_PRIV unsigned int get_memory_size(int type)
26 if (type == MEMORY_SIZE_8K)
28 else if (type <= MEMORY_SIZE_8M)
29 return (32 * 1024) << type;
34 static int clz(unsigned int x)
39 if (!(x & 0xFFFF0000)) {
43 if (!(x & 0xFF000000)) {
47 if (!(x & 0xF0000000)) {
51 if (!(x & 0xC0000000)) {
55 if (!(x & 0x80000000))
60 SR_PRIV int set_limit_samples(struct dev_context *devc, uint64_t samples)
62 if (samples > devc->max_sample_depth)
63 samples = devc->max_sample_depth;
65 devc->limit_samples = samples;
67 if (samples <= (2 * 1024))
68 devc->memory_size = MEMORY_SIZE_8K;
69 else if (samples <= (16 * 1024))
70 devc->memory_size = MEMORY_SIZE_64K;
72 devc->memory_size = 19 - clz(samples - 1);
74 sr_info("Setting memory size to %dK.",
75 get_memory_size(devc->memory_size) / 1024);
77 analyzer_set_memory_size(devc->memory_size);
82 SR_PRIV int set_capture_ratio(struct dev_context *devc, uint64_t ratio)
85 sr_err("Invalid capture ratio: %" PRIu64 ".", ratio);
89 devc->capture_ratio = ratio;
91 sr_info("Setting capture ratio to %d%%.", devc->capture_ratio);
96 SR_PRIV int set_voltage_threshold(struct dev_context *devc, double thresh)
103 devc->cur_threshold = thresh;
105 analyzer_set_voltage_threshold((int) round(-9.1*thresh + 62.6));
107 sr_info("Setting voltage threshold to %fV.", devc->cur_threshold);
112 SR_PRIV void set_triggerbar(struct dev_context *devc)
114 unsigned int trigger_depth, triggerbar, ramsize_trigger;
116 trigger_depth = get_memory_size(devc->memory_size) / 4;
117 if (devc->limit_samples < trigger_depth)
118 trigger_depth = devc->limit_samples;
121 triggerbar = trigger_depth * devc->capture_ratio / 100;
125 ramsize_trigger = trigger_depth - triggerbar;
126 /* Matches USB packet captures from official app/driver */
130 ramsize_trigger -= 1;
134 analyzer_set_triggerbar_address(triggerbar);
135 analyzer_set_ramsize_trigger_address(ramsize_trigger);
137 sr_dbg("triggerbar_address = %d(0x%x)", triggerbar, triggerbar);
138 sr_dbg("ramsize_triggerbar_address = %d(0x%x)",
139 ramsize_trigger, ramsize_trigger);