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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 <math.h>
21 #include "protocol.h"
22
23 SR_PRIV unsigned int get_memory_size(int type)
24 {
25         if (type == MEMORY_SIZE_8K)
26                 return 8 * 1024;
27         else if (type <= MEMORY_SIZE_8M)
28                 return (32 * 1024) << type;
29         else
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         if (samples > devc->max_sample_depth)
62                 samples = devc->max_sample_depth;
63
64         devc->limit_samples = samples;
65
66         if (samples <= 2 * 1024)
67                 devc->memory_size = MEMORY_SIZE_8K;
68         else if (samples <= 16 * 1024)
69                 devc->memory_size = MEMORY_SIZE_64K;
70         else
71                 devc->memory_size = 19 - clz(samples - 1);
72
73         sr_info("Setting memory size to %dK.",
74                 get_memory_size(devc->memory_size) / 1024);
75
76         analyzer_set_memory_size(devc->memory_size);
77
78         return SR_OK;
79 }
80
81 SR_PRIV int set_capture_ratio(struct dev_context *devc, uint64_t ratio)
82 {
83         if (ratio > 100) {
84                 sr_err("Invalid capture ratio: %" PRIu64 ".", ratio);
85                 return SR_ERR_ARG;
86         }
87
88         devc->capture_ratio = ratio;
89
90         sr_info("Setting capture ratio to %d%%.", devc->capture_ratio);
91
92         return SR_OK;
93 }
94
95 SR_PRIV int set_voltage_threshold(struct dev_context *devc, double thresh)
96 {
97         if (thresh > 6.0)
98                 thresh = 6.0;
99         if (thresh < -6.0)
100                 thresh = -6.0;
101
102         devc->cur_threshold = thresh;
103
104         analyzer_set_voltage_threshold((int) round(-9.1*thresh + 62.6));
105
106         sr_info("Setting voltage threshold to %fV.", devc->cur_threshold);
107
108         return SR_OK;
109 }
110
111 SR_PRIV void set_triggerbar(struct dev_context *devc)
112 {
113         unsigned int trigger_depth, triggerbar, ramsize_trigger;
114
115         trigger_depth = get_memory_size(devc->memory_size) / 4;
116         if (devc->limit_samples < trigger_depth)
117                 trigger_depth = devc->limit_samples;
118
119         if (devc->trigger)
120                 triggerbar = trigger_depth * devc->capture_ratio / 100;
121         else
122                 triggerbar = 0;
123
124         ramsize_trigger = trigger_depth - triggerbar;
125         /* Matches USB packet captures from official app/driver */
126         if (triggerbar > 2)
127                 triggerbar -= 2;
128         else {
129                 ramsize_trigger -= 1;
130                 triggerbar = 0;
131         }
132
133         analyzer_set_triggerbar_address(triggerbar);
134         analyzer_set_ramsize_trigger_address(ramsize_trigger);
135
136         sr_dbg("triggerbar_address = %d(0x%x)", triggerbar, triggerbar);
137         sr_dbg("ramsize_triggerbar_address = %d(0x%x)",
138                ramsize_trigger, ramsize_trigger);
139 }