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1 | /* | |
2 | * This file is part of the sigrok 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 | /* Message logging helpers with driver-specific prefix string. */ | |
28 | #define DRIVER_LOG_DOMAIN "output/chronovu-la8: " | |
29 | #define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args) | |
30 | #define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args) | |
31 | #define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args) | |
32 | #define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args) | |
33 | #define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args) | |
34 | #define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args) | |
35 | ||
36 | struct context { | |
37 | unsigned int num_enabled_probes; | |
38 | unsigned int unitsize; | |
39 | char *probelist[SR_MAX_NUM_PROBES + 1]; | |
40 | uint64_t trigger_point; | |
41 | uint64_t samplerate; | |
42 | }; | |
43 | ||
44 | /** | |
45 | * Check if the given samplerate is supported by the LA8 hardware. | |
46 | * | |
47 | * @param samplerate The samplerate (in Hz) to check. | |
48 | * | |
49 | * @return 1 if the samplerate is supported/valid, 0 otherwise. | |
50 | */ | |
51 | static int is_valid_samplerate(uint64_t samplerate) | |
52 | { | |
53 | unsigned int i; | |
54 | ||
55 | for (i = 0; i < 255; i++) { | |
56 | if (samplerate == (SR_MHZ(100) / (i + 1))) | |
57 | return 1; | |
58 | } | |
59 | ||
60 | sr_warn("%s: invalid samplerate (%" PRIu64 "Hz)", | |
61 | __func__, samplerate); | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | /** | |
67 | * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants. | |
68 | * | |
69 | * LA8 hardware: sample period = (divcount + 1) * 10ns. | |
70 | * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate). | |
71 | * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate). | |
72 | * | |
73 | * @param samplerate The samplerate in Hz. | |
74 | * | |
75 | * @return The divcount value as needed by the hardware, or 0xff upon errors. | |
76 | */ | |
77 | static uint8_t samplerate_to_divcount(uint64_t samplerate) | |
78 | { | |
79 | if (samplerate == 0) { | |
80 | sr_warn("%s: samplerate was 0", __func__); | |
81 | return 0xff; | |
82 | } | |
83 | ||
84 | if (!is_valid_samplerate(samplerate)) { | |
85 | sr_warn("%s: can't get divcount, samplerate invalid", __func__); | |
86 | return 0xff; | |
87 | } | |
88 | ||
89 | return (SR_MHZ(100) / samplerate) - 1; | |
90 | } | |
91 | ||
92 | static int init(struct sr_output *o) | |
93 | { | |
94 | struct context *ctx; | |
95 | struct sr_probe *probe; | |
96 | GSList *l; | |
97 | uint64_t *samplerate; | |
98 | ||
99 | if (!o) { | |
100 | sr_warn("%s: o was NULL", __func__); | |
101 | return SR_ERR_ARG; | |
102 | } | |
103 | ||
104 | if (!o->sdi) { | |
105 | sr_warn("%s: o->sdi was NULL", __func__); | |
106 | return SR_ERR_ARG; | |
107 | } | |
108 | ||
109 | if (!o->sdi->driver) { | |
110 | sr_warn("%s: o->sdi->driver was NULL", __func__); | |
111 | return SR_ERR_ARG; | |
112 | } | |
113 | ||
114 | if (!(ctx = g_try_malloc0(sizeof(struct context)))) { | |
115 | sr_warn("%s: ctx malloc failed", __func__); | |
116 | return SR_ERR_MALLOC; | |
117 | } | |
118 | ||
119 | o->internal = ctx; | |
120 | ||
121 | /* Get the probe names and the unitsize. */ | |
122 | for (l = o->sdi->probes; l; l = l->next) { | |
123 | probe = l->data; | |
124 | if (!probe->enabled) | |
125 | continue; | |
126 | ctx->probelist[ctx->num_enabled_probes++] = probe->name; | |
127 | } | |
128 | ctx->probelist[ctx->num_enabled_probes] = 0; | |
129 | ctx->unitsize = (ctx->num_enabled_probes + 7) / 8; | |
130 | ||
131 | if (sr_dev_has_option(o->sdi, SR_CONF_SAMPLERATE)) { | |
132 | o->sdi->driver->config_get(SR_CONF_SAMPLERATE, | |
133 | (const void **)&samplerate, o->sdi); | |
134 | ctx->samplerate = *samplerate; | |
135 | } else | |
136 | ctx->samplerate = 0; | |
137 | ||
138 | return SR_OK; | |
139 | } | |
140 | ||
141 | static int event(struct sr_output *o, int event_type, uint8_t **data_out, | |
142 | uint64_t *length_out) | |
143 | { | |
144 | struct context *ctx; | |
145 | uint8_t *outbuf; | |
146 | ||
147 | if (!o) { | |
148 | sr_warn("%s: o was NULL", __func__); | |
149 | return SR_ERR_ARG; | |
150 | } | |
151 | ||
152 | if (!(ctx = o->internal)) { | |
153 | sr_warn("%s: o->internal was NULL", __func__); | |
154 | return SR_ERR_ARG; | |
155 | } | |
156 | ||
157 | if (!data_out) { | |
158 | sr_warn("%s: data_out was NULL", __func__); | |
159 | return SR_ERR_ARG; | |
160 | } | |
161 | ||
162 | switch (event_type) { | |
163 | case SR_DF_TRIGGER: | |
164 | sr_dbg("%s: SR_DF_TRIGGER event", __func__); | |
165 | /* Save the trigger point for later (SR_DF_END). */ | |
166 | ctx->trigger_point = 0; /* TODO: Store _actual_ value. */ | |
167 | break; | |
168 | case SR_DF_END: | |
169 | sr_dbg("%s: SR_DF_END event", __func__); | |
170 | if (!(outbuf = g_try_malloc(4 + 1))) { | |
171 | sr_warn("la8 out: %s: outbuf malloc failed", __func__); | |
172 | return SR_ERR_MALLOC; | |
173 | } | |
174 | ||
175 | /* One byte for the 'divcount' value. */ | |
176 | outbuf[0] = samplerate_to_divcount(ctx->samplerate); | |
177 | // if (outbuf[0] == 0xff) { | |
178 | // sr_warn("%s: invalid divcount", __func__); | |
179 | // return SR_ERR; | |
180 | // } | |
181 | ||
182 | /* Four bytes (little endian) for the trigger point. */ | |
183 | outbuf[1] = (ctx->trigger_point >> 0) & 0xff; | |
184 | outbuf[2] = (ctx->trigger_point >> 8) & 0xff; | |
185 | outbuf[3] = (ctx->trigger_point >> 16) & 0xff; | |
186 | outbuf[4] = (ctx->trigger_point >> 24) & 0xff; | |
187 | ||
188 | *data_out = outbuf; | |
189 | *length_out = 4 + 1; | |
190 | g_free(o->internal); | |
191 | o->internal = NULL; | |
192 | break; | |
193 | default: | |
194 | sr_warn("%s: unsupported event type: %d", __func__, | |
195 | event_type); | |
196 | *data_out = NULL; | |
197 | *length_out = 0; | |
198 | break; | |
199 | } | |
200 | ||
201 | return SR_OK; | |
202 | } | |
203 | ||
204 | static int data(struct sr_output *o, const uint8_t *data_in, | |
205 | uint64_t length_in, uint8_t **data_out, uint64_t *length_out) | |
206 | { | |
207 | struct context *ctx; | |
208 | uint8_t *outbuf; | |
209 | ||
210 | if (!o) { | |
211 | sr_warn("%s: o was NULL", __func__); | |
212 | return SR_ERR_ARG; | |
213 | } | |
214 | ||
215 | if (!(ctx = o->internal)) { | |
216 | sr_warn("%s: o->internal was NULL", __func__); | |
217 | return SR_ERR_ARG; | |
218 | } | |
219 | ||
220 | if (!data_in) { | |
221 | sr_warn("%s: data_in was NULL", __func__); | |
222 | return SR_ERR_ARG; | |
223 | } | |
224 | ||
225 | if (!(outbuf = g_try_malloc0(length_in))) { | |
226 | sr_warn("%s: outbuf malloc failed", __func__); | |
227 | return SR_ERR_MALLOC; | |
228 | } | |
229 | ||
230 | memcpy(outbuf, data_in, length_in); | |
231 | ||
232 | *data_out = outbuf; | |
233 | *length_out = length_in; | |
234 | ||
235 | return SR_OK; | |
236 | } | |
237 | ||
238 | SR_PRIV struct sr_output_format output_chronovu_la8 = { | |
239 | .id = "chronovu-la8", | |
240 | .description = "ChronoVu LA8", | |
241 | .df_type = SR_DF_LOGIC, | |
242 | .init = init, | |
243 | .data = data, | |
244 | .event = event, | |
245 | }; |