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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 <sigrok.h> | |
25 | ||
26 | struct context { | |
27 | unsigned int num_enabled_probes; | |
28 | unsigned int unitsize; | |
29 | char *probelist[SR_MAX_NUM_PROBES + 1]; | |
30 | uint64_t trigger_point; | |
31 | uint64_t samplerate; | |
32 | }; | |
33 | ||
34 | /** | |
35 | * Check if the given samplerate is supported by the LA8 hardware. | |
36 | * | |
37 | * @param samplerate The samplerate (in Hz) to check. | |
38 | * @return 1 if the samplerate is supported/valid, 0 otherwise. | |
39 | */ | |
40 | static int is_valid_samplerate(uint64_t samplerate) | |
41 | { | |
42 | unsigned int i; | |
43 | ||
44 | for (i = 0; i < 255; i++) { | |
45 | if (samplerate == (SR_MHZ(100) / (i + 1))) | |
46 | return 1; | |
47 | } | |
48 | ||
49 | g_warning("la8 out: %s: invalid samplerate (%" PRIu64 "Hz)", | |
50 | __func__, samplerate); | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | /** | |
56 | * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants. | |
57 | * | |
58 | * LA8 hardware: sample period = (divcount + 1) * 10ns. | |
59 | * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate). | |
60 | * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate). | |
61 | * | |
62 | * @param samplerate The samplerate in Hz. | |
63 | * @return The divcount value as needed by the hardware, or 0xff upon errors. | |
64 | */ | |
65 | static uint8_t samplerate_to_divcount(uint64_t samplerate) | |
66 | { | |
67 | if (samplerate == 0) { | |
68 | g_warning("la8 out: %s: samplerate was 0", __func__); | |
69 | return 0xff; | |
70 | } | |
71 | ||
72 | if (!is_valid_samplerate(samplerate)) { | |
73 | g_warning("la8 out: %s: can't get divcount, samplerate invalid", | |
74 | __func__); | |
75 | return 0xff; | |
76 | } | |
77 | ||
78 | return (SR_MHZ(100) / samplerate) - 1; | |
79 | } | |
80 | ||
81 | static int init(struct sr_output *o) | |
82 | { | |
83 | struct context *ctx; | |
84 | struct sr_probe *probe; | |
85 | GSList *l; | |
86 | int num_probes; | |
87 | uint64_t samplerate; | |
88 | ||
89 | if (!o) { | |
90 | g_warning("la8 out: %s: o was NULL", __func__); | |
91 | return SR_ERR_ARG; | |
92 | } | |
93 | ||
94 | if (!o->device) { | |
95 | g_warning("la8 out: %s: o->device was NULL", __func__); | |
96 | return SR_ERR_ARG; | |
97 | } | |
98 | ||
99 | if (!o->device->plugin) { | |
100 | g_warning("la8 out: %s: o->device->plugin was NULL", __func__); | |
101 | return SR_ERR_ARG; | |
102 | } | |
103 | ||
104 | if (!(ctx = calloc(1, sizeof(struct context)))) { | |
105 | g_warning("la8 out: %s: ctx calloc failed", __func__); | |
106 | return SR_ERR_MALLOC; | |
107 | } | |
108 | ||
109 | o->internal = ctx; | |
110 | ||
111 | /* Get the number of probes, their names, and the unitsize. */ | |
112 | /* TODO: Error handling. */ | |
113 | for (l = o->device->probes; l; l = l->next) { | |
114 | probe = l->data; | |
115 | if (!probe->enabled) | |
116 | continue; | |
117 | ctx->probelist[ctx->num_enabled_probes++] = probe->name; | |
118 | } | |
119 | ctx->probelist[ctx->num_enabled_probes] = 0; | |
120 | ctx->unitsize = (ctx->num_enabled_probes + 7) / 8; | |
121 | ||
122 | num_probes = g_slist_length(o->device->probes); | |
123 | ||
124 | if (sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) { | |
125 | samplerate = *((uint64_t *) o->device->plugin->get_device_info( | |
126 | o->device->plugin_index, SR_DI_CUR_SAMPLERATE)); | |
127 | /* TODO: Error checks. */ | |
128 | } else { | |
129 | samplerate = 0; /* TODO: Error or set some value? */ | |
130 | } | |
131 | ctx->samplerate = samplerate; | |
132 | ||
133 | return 0; /* TODO: SR_OK? */ | |
134 | } | |
135 | ||
136 | static int event(struct sr_output *o, int event_type, char **data_out, | |
137 | uint64_t *length_out) | |
138 | { | |
139 | struct context *ctx; | |
140 | char *outbuf; | |
141 | ||
142 | if (!o) { | |
143 | g_warning("la8 out: %s: o was NULL", __func__); | |
144 | return SR_ERR_ARG; | |
145 | } | |
146 | ||
147 | if (!(ctx = o->internal)) { | |
148 | g_warning("la8 out: %s: o->internal was NULL", __func__); | |
149 | return SR_ERR_ARG; | |
150 | } | |
151 | ||
152 | if (!data_out) { | |
153 | g_warning("la8 out: %s: data_out was NULL", __func__); | |
154 | return SR_ERR_ARG; | |
155 | } | |
156 | ||
157 | switch (event_type) { | |
158 | case SR_DF_TRIGGER: | |
159 | g_debug("la8 out: %s: SR_DF_TRIGGER event", __func__); | |
160 | /* Save the trigger point for later (SR_DF_END). */ | |
161 | ctx->trigger_point = 0; /* TODO: Store _actual_ value. */ | |
162 | break; | |
163 | case SR_DF_END: | |
164 | g_debug("la8 out: %s: SR_DF_END event", __func__); | |
165 | if (!(outbuf = malloc(4 + 1))) { | |
166 | g_warning("la8 out: %s: outbuf malloc failed", | |
167 | __func__); | |
168 | return SR_ERR_MALLOC; | |
169 | } | |
170 | ||
171 | /* One byte for the 'divcount' value. */ | |
172 | outbuf[0] = samplerate_to_divcount(ctx->samplerate); | |
173 | // if (outbuf[0] == 0xff) { | |
174 | // g_warning("la8 out: %s: invalid divcount", __func__); | |
175 | // return SR_ERR; | |
176 | // } | |
177 | ||
178 | /* Four bytes (little endian) for the trigger point. */ | |
179 | outbuf[1] = (ctx->trigger_point >> 0) & 0xff; | |
180 | outbuf[2] = (ctx->trigger_point >> 8) & 0xff; | |
181 | outbuf[3] = (ctx->trigger_point >> 16) & 0xff; | |
182 | outbuf[4] = (ctx->trigger_point >> 24) & 0xff; | |
183 | ||
184 | *data_out = outbuf; | |
185 | *length_out = 4 + 1; | |
186 | free(o->internal); | |
187 | o->internal = NULL; | |
188 | break; | |
189 | default: | |
190 | g_warning("la8 out: %s: unsupported event type: %d", __func__, | |
191 | event_type); | |
192 | *data_out = NULL; | |
193 | *length_out = 0; | |
194 | break; | |
195 | } | |
196 | ||
197 | return SR_OK; | |
198 | } | |
199 | ||
200 | static int data(struct sr_output *o, const char *data_in, uint64_t length_in, | |
201 | char **data_out, uint64_t *length_out) | |
202 | { | |
203 | struct context *ctx; | |
204 | char *outbuf; | |
205 | ||
206 | if (!o) { | |
207 | g_warning("la8 out: %s: o was NULL", __func__); | |
208 | return SR_ERR_ARG; | |
209 | } | |
210 | ||
211 | if (!(ctx = o->internal)) { | |
212 | g_warning("la8 out: %s: o->internal was NULL", __func__); | |
213 | return SR_ERR_ARG; | |
214 | } | |
215 | ||
216 | if (!data_in) { | |
217 | g_warning("la8 out: %s: data_in was NULL", __func__); | |
218 | return SR_ERR_ARG; | |
219 | } | |
220 | ||
221 | if (!(outbuf = calloc(1, length_in))) { | |
222 | g_warning("la8 out: %s: outbuf calloc failed", __func__); | |
223 | return SR_ERR_MALLOC; | |
224 | } | |
225 | ||
226 | memcpy(outbuf, data_in, length_in); | |
227 | ||
228 | *data_out = outbuf; | |
229 | *length_out = length_in; | |
230 | ||
231 | return SR_OK; | |
232 | } | |
233 | ||
234 | struct sr_output_format output_chronovu_la8 = { | |
235 | .id = "chronovu-la8", | |
236 | .description = "ChronoVu LA8", | |
237 | .df_type = SR_DF_LOGIC, | |
238 | .init = init, | |
239 | .data = data, | |
240 | .event = event, | |
241 | }; |