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