2 * This file is part of the libsigrok project.
4 * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de>
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.
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.
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
24 #include "libsigrok.h"
25 #include "libsigrok-internal.h"
27 /* Message logging helpers with subsystem-specific prefix string. */
28 #define LOG_PREFIX "output/chronovu-la8: "
29 #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
30 #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
31 #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
32 #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
33 #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
34 #define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
37 unsigned int num_enabled_probes;
38 unsigned int unitsize;
39 uint64_t trigger_point;
44 * Check if the given samplerate is supported by the LA8 hardware.
46 * @param samplerate The samplerate (in Hz) to check.
48 * @return 1 if the samplerate is supported/valid, 0 otherwise.
50 static int is_valid_samplerate(uint64_t samplerate)
54 for (i = 0; i < 255; i++) {
55 if (samplerate == (SR_MHZ(100) / (i + 1)))
59 sr_warn("%s: invalid samplerate (%" PRIu64 "Hz)",
60 __func__, samplerate);
66 * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants.
68 * LA8 hardware: sample period = (divcount + 1) * 10ns.
69 * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate).
70 * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate).
72 * @param samplerate The samplerate in Hz.
74 * @return The divcount value as needed by the hardware, or 0xff upon errors.
76 static uint8_t samplerate_to_divcount(uint64_t samplerate)
78 if (samplerate == 0) {
79 sr_warn("%s: samplerate was 0", __func__);
83 if (!is_valid_samplerate(samplerate)) {
84 sr_warn("%s: can't get divcount, samplerate invalid", __func__);
88 return (SR_MHZ(100) / samplerate) - 1;
91 static int init(struct sr_output *o)
94 struct sr_probe *probe;
99 sr_warn("%s: o was NULL", __func__);
104 sr_warn("%s: o->sdi was NULL", __func__);
108 if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
109 sr_warn("%s: ctx malloc failed", __func__);
110 return SR_ERR_MALLOC;
115 /* Get the unitsize. */
116 for (l = o->sdi->probes; l; l = l->next) {
120 ctx->num_enabled_probes++;
122 ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
124 if (sr_config_get(o->sdi->driver, SR_CONF_SAMPLERATE, &gvar,
126 ctx->samplerate = g_variant_get_uint64(gvar);
127 g_variant_unref(gvar);
134 static int event(struct sr_output *o, int event_type, uint8_t **data_out,
135 uint64_t *length_out)
141 sr_warn("%s: o was NULL", __func__);
145 if (!(ctx = o->internal)) {
146 sr_warn("%s: o->internal was NULL", __func__);
151 sr_warn("%s: data_out was NULL", __func__);
155 switch (event_type) {
157 sr_dbg("%s: SR_DF_TRIGGER event", __func__);
158 /* Save the trigger point for later (SR_DF_END). */
159 ctx->trigger_point = 0; /* TODO: Store _actual_ value. */
162 sr_dbg("%s: SR_DF_END event", __func__);
163 if (!(outbuf = g_try_malloc(4 + 1))) {
164 sr_warn("la8 out: %s: outbuf malloc failed", __func__);
165 return SR_ERR_MALLOC;
168 /* One byte for the 'divcount' value. */
169 outbuf[0] = samplerate_to_divcount(ctx->samplerate);
170 // if (outbuf[0] == 0xff) {
171 // sr_warn("%s: invalid divcount", __func__);
175 /* Four bytes (little endian) for the trigger point. */
176 outbuf[1] = (ctx->trigger_point >> 0) & 0xff;
177 outbuf[2] = (ctx->trigger_point >> 8) & 0xff;
178 outbuf[3] = (ctx->trigger_point >> 16) & 0xff;
179 outbuf[4] = (ctx->trigger_point >> 24) & 0xff;
187 sr_warn("%s: unsupported event type: %d", __func__,
197 static int data(struct sr_output *o, const uint8_t *data_in,
198 uint64_t length_in, uint8_t **data_out, uint64_t *length_out)
204 sr_warn("%s: o was NULL", __func__);
208 if (!(ctx = o->internal)) {
209 sr_warn("%s: o->internal was NULL", __func__);
214 sr_warn("%s: data_in was NULL", __func__);
218 if (!(outbuf = g_try_malloc0(length_in))) {
219 sr_warn("%s: outbuf malloc failed", __func__);
220 return SR_ERR_MALLOC;
223 memcpy(outbuf, data_in, length_in);
226 *length_out = length_in;
231 SR_PRIV struct sr_output_format output_chronovu_la8 = {
232 .id = "chronovu-la8",
233 .description = "ChronoVu LA8",
234 .df_type = SR_DF_LOGIC,