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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de> | |
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 2 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, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <glib.h> | |
24 | #include "libsigrok.h" | |
25 | #include "libsigrok-internal.h" | |
26 | ||
27 | #define LOG_PREFIX "output/chronovu-la8" | |
28 | ||
29 | struct context { | |
30 | unsigned int num_enabled_channels; | |
31 | unsigned int unitsize; | |
32 | uint64_t trigger_point; | |
33 | uint64_t samplerate; | |
34 | }; | |
35 | ||
36 | /** | |
37 | * Check if the given samplerate is supported by the LA8 hardware. | |
38 | * | |
39 | * @param samplerate The samplerate (in Hz) to check. | |
40 | * | |
41 | * @return 1 if the samplerate is supported/valid, 0 otherwise. | |
42 | */ | |
43 | static int is_valid_samplerate(uint64_t samplerate) | |
44 | { | |
45 | unsigned int i; | |
46 | ||
47 | for (i = 0; i < 255; i++) { | |
48 | if (samplerate == (SR_MHZ(100) / (i + 1))) | |
49 | return 1; | |
50 | } | |
51 | ||
52 | sr_warn("%s: invalid samplerate (%" PRIu64 "Hz)", | |
53 | __func__, samplerate); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | /** | |
59 | * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants. | |
60 | * | |
61 | * LA8 hardware: sample period = (divcount + 1) * 10ns. | |
62 | * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate). | |
63 | * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate). | |
64 | * | |
65 | * @param samplerate The samplerate in Hz. | |
66 | * | |
67 | * @return The divcount value as needed by the hardware, or 0xff upon errors. | |
68 | */ | |
69 | static uint8_t samplerate_to_divcount(uint64_t samplerate) | |
70 | { | |
71 | if (samplerate == 0) { | |
72 | sr_warn("%s: samplerate was 0", __func__); | |
73 | return 0xff; | |
74 | } | |
75 | ||
76 | if (!is_valid_samplerate(samplerate)) { | |
77 | sr_warn("%s: can't get divcount, samplerate invalid", __func__); | |
78 | return 0xff; | |
79 | } | |
80 | ||
81 | return (SR_MHZ(100) / samplerate) - 1; | |
82 | } | |
83 | ||
84 | static int init(struct sr_output *o) | |
85 | { | |
86 | struct context *ctx; | |
87 | struct sr_channel *ch; | |
88 | GSList *l; | |
89 | GVariant *gvar; | |
90 | ||
91 | if (!o) { | |
92 | sr_warn("%s: o was NULL", __func__); | |
93 | return SR_ERR_ARG; | |
94 | } | |
95 | ||
96 | if (!o->sdi) { | |
97 | sr_warn("%s: o->sdi was NULL", __func__); | |
98 | return SR_ERR_ARG; | |
99 | } | |
100 | ||
101 | if (!(ctx = g_try_malloc0(sizeof(struct context)))) { | |
102 | sr_warn("%s: ctx malloc failed", __func__); | |
103 | return SR_ERR_MALLOC; | |
104 | } | |
105 | ||
106 | o->internal = ctx; | |
107 | ||
108 | /* Get the unitsize. */ | |
109 | for (l = o->sdi->channels; l; l = l->next) { | |
110 | ch = l->data; | |
111 | if (ch->type != SR_CHANNEL_LOGIC) | |
112 | continue; | |
113 | if (!ch->enabled) | |
114 | continue; | |
115 | ctx->num_enabled_channels++; | |
116 | } | |
117 | ctx->unitsize = (ctx->num_enabled_channels + 7) / 8; | |
118 | ||
119 | if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE, | |
120 | &gvar) == SR_OK) { | |
121 | ctx->samplerate = g_variant_get_uint64(gvar); | |
122 | g_variant_unref(gvar); | |
123 | } else | |
124 | ctx->samplerate = 0; | |
125 | ||
126 | return SR_OK; | |
127 | } | |
128 | ||
129 | static int event(struct sr_output *o, int event_type, uint8_t **data_out, | |
130 | uint64_t *length_out) | |
131 | { | |
132 | struct context *ctx; | |
133 | uint8_t *outbuf; | |
134 | ||
135 | if (!o) { | |
136 | sr_warn("%s: o was NULL", __func__); | |
137 | return SR_ERR_ARG; | |
138 | } | |
139 | ||
140 | if (!(ctx = o->internal)) { | |
141 | sr_warn("%s: o->internal was NULL", __func__); | |
142 | return SR_ERR_ARG; | |
143 | } | |
144 | ||
145 | if (!data_out) { | |
146 | sr_warn("%s: data_out was NULL", __func__); | |
147 | return SR_ERR_ARG; | |
148 | } | |
149 | ||
150 | switch (event_type) { | |
151 | case SR_DF_TRIGGER: | |
152 | sr_dbg("%s: SR_DF_TRIGGER event", __func__); | |
153 | /* Save the trigger point for later (SR_DF_END). */ | |
154 | ctx->trigger_point = 0; /* TODO: Store _actual_ value. */ | |
155 | break; | |
156 | case SR_DF_END: | |
157 | sr_dbg("%s: SR_DF_END event", __func__); | |
158 | if (!(outbuf = g_try_malloc(4 + 1))) { | |
159 | sr_warn("la8 out: %s: outbuf malloc failed", __func__); | |
160 | return SR_ERR_MALLOC; | |
161 | } | |
162 | ||
163 | /* One byte for the 'divcount' value. */ | |
164 | outbuf[0] = samplerate_to_divcount(ctx->samplerate); | |
165 | // if (outbuf[0] == 0xff) { | |
166 | // sr_warn("%s: invalid divcount", __func__); | |
167 | // return SR_ERR; | |
168 | // } | |
169 | ||
170 | /* Four bytes (little endian) for the trigger point. */ | |
171 | outbuf[1] = (ctx->trigger_point >> 0) & 0xff; | |
172 | outbuf[2] = (ctx->trigger_point >> 8) & 0xff; | |
173 | outbuf[3] = (ctx->trigger_point >> 16) & 0xff; | |
174 | outbuf[4] = (ctx->trigger_point >> 24) & 0xff; | |
175 | ||
176 | *data_out = outbuf; | |
177 | *length_out = 4 + 1; | |
178 | g_free(o->internal); | |
179 | o->internal = NULL; | |
180 | break; | |
181 | default: | |
182 | sr_warn("%s: unsupported event type: %d", __func__, | |
183 | event_type); | |
184 | *data_out = NULL; | |
185 | *length_out = 0; | |
186 | break; | |
187 | } | |
188 | ||
189 | return SR_OK; | |
190 | } | |
191 | ||
192 | static int data(struct sr_output *o, const uint8_t *data_in, | |
193 | uint64_t length_in, uint8_t **data_out, uint64_t *length_out) | |
194 | { | |
195 | struct context *ctx; | |
196 | uint8_t *outbuf; | |
197 | ||
198 | if (!o) { | |
199 | sr_warn("%s: o was NULL", __func__); | |
200 | return SR_ERR_ARG; | |
201 | } | |
202 | ||
203 | if (!(ctx = o->internal)) { | |
204 | sr_warn("%s: o->internal was NULL", __func__); | |
205 | return SR_ERR_ARG; | |
206 | } | |
207 | ||
208 | if (!data_in) { | |
209 | sr_warn("%s: data_in was NULL", __func__); | |
210 | return SR_ERR_ARG; | |
211 | } | |
212 | ||
213 | if (!(outbuf = g_try_malloc0(length_in))) { | |
214 | sr_warn("%s: outbuf malloc failed", __func__); | |
215 | return SR_ERR_MALLOC; | |
216 | } | |
217 | ||
218 | memcpy(outbuf, data_in, length_in); | |
219 | ||
220 | *data_out = outbuf; | |
221 | *length_out = length_in; | |
222 | ||
223 | return SR_OK; | |
224 | } | |
225 | ||
226 | SR_PRIV struct sr_output_format output_chronovu_la8 = { | |
227 | .id = "chronovu-la8", | |
228 | .description = "ChronoVu LA8", | |
229 | .df_type = SR_DF_LOGIC, | |
230 | .init = init, | |
231 | .data = data, | |
232 | .event = event, | |
233 | }; |