src/input/feed_queue.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2020 Gerhard Sittig <gerhard.sittig@gmx.net>
   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 <libsigrok/libsigrok.h>
  21 #include "libsigrok-internal.h"
  22 #include <string.h>
  23
  24 struct feed_queue_logic {
  25         const struct sr_dev_inst *sdi;
  26         size_t unit_size;
  27         size_t alloc_count;
  28         size_t fill_count;
  29         uint8_t *data_bytes;
  30         struct sr_datafeed_packet packet;
  31         struct sr_datafeed_logic logic;
  32 };
  33
  34 SR_API struct feed_queue_logic *feed_queue_logic_alloc(
  35         const struct sr_dev_inst *sdi,
  36         size_t sample_count, size_t unit_size)
  37 {
  38         struct feed_queue_logic *q;
  39
  40         q = g_malloc0(sizeof(*q));
  41         q->sdi = sdi;
  42         q->unit_size = unit_size;
  43         q->alloc_count = sample_count;
  44         q->data_bytes = g_try_malloc(q->alloc_count * q->unit_size);
  45         if (!q->data_bytes) {
  46                 g_free(q);
  47                 return NULL;
  48         }
  49
  50         memset(&q->packet, 0, sizeof(q->packet));
  51         memset(&q->logic, 0, sizeof(q->logic));
  52         q->packet.type = SR_DF_LOGIC;
  53         q->packet.payload = &q->logic;
  54         q->logic.unitsize = q->unit_size;
  55         q->logic.data = q->data_bytes;
  56
  57         return q;
  58 }
  59
  60 SR_API int feed_queue_logic_submit(struct feed_queue_logic *q,
  61         const uint8_t *data, size_t count)
  62 {
  63         uint8_t *wrptr;
  64         int ret;
  65
  66         wrptr = &q->data_bytes[q->fill_count * q->unit_size];
  67         while (count--) {
  68                 memcpy(wrptr, data, q->unit_size);
  69                 wrptr += q->unit_size;
  70                 q->fill_count++;
  71                 if (q->fill_count == q->alloc_count) {
  72                         ret = feed_queue_logic_flush(q);
  73                         if (ret != SR_OK)
  74                                 return ret;
  75                         wrptr = &q->data_bytes[0];
  76                 }
  77         }
  78
  79         return SR_OK;
  80 }
  81
  82 SR_API int feed_queue_logic_flush(struct feed_queue_logic *q)
  83 {
  84         int ret;
  85
  86         if (!q->fill_count)
  87                 return SR_OK;
  88
  89         q->logic.length = q->fill_count * q->unit_size;
  90         ret = sr_session_send(q->sdi, &q->packet);
  91         if (ret != SR_OK)
  92                 return ret;
  93         q->fill_count = 0;
  94
  95         return SR_OK;
  96 }
  97
  98 SR_API void feed_queue_logic_free(struct feed_queue_logic *q)
  99 {
 100
 101         if (!q)
 102                 return;
 103
 104         g_free(q->data_bytes);
 105         g_free(q);
 106 }
 107
 108 struct feed_queue_analog {
 109         const struct sr_dev_inst *sdi;
 110         size_t alloc_count;
 111         size_t fill_count;
 112         float *data_values;
 113         int digits;
 114         struct sr_datafeed_packet packet;
 115         struct sr_datafeed_analog analog;
 116         struct sr_analog_encoding encoding;
 117         struct sr_analog_meaning meaning;
 118         struct sr_analog_spec spec;
 119         GSList *channels;
 120 };
 121
 122 SR_API struct feed_queue_analog *feed_queue_analog_alloc(
 123         const struct sr_dev_inst *sdi,
 124         size_t sample_count, int digits, struct sr_channel *ch)
 125 {
 126         struct feed_queue_analog *q;
 127
 128         q = g_malloc0(sizeof(*q));
 129         q->sdi = sdi;
 130         q->alloc_count = sample_count;
 131         q->data_values = g_try_malloc(q->alloc_count * sizeof(float));
 132         if (!q->data_values) {
 133                 g_free(q);
 134                 return NULL;
 135         }
 136         q->digits = digits;
 137         q->channels = g_slist_append(NULL, ch);
 138
 139         memset(&q->packet, 0, sizeof(q->packet));
 140         sr_analog_init(&q->analog, &q->encoding, &q->meaning, &q->spec, digits);
 141         q->packet.type = SR_DF_ANALOG;
 142         q->packet.payload = &q->analog;
 143         q->encoding.is_signed = TRUE;
 144         q->meaning.channels = q->channels;
 145         q->analog.data = q->data_values;
 146
 147         return q;
 148 }
 149
 150 SR_API int feed_queue_analog_submit(struct feed_queue_analog *q,
 151         float data, size_t count)
 152 {
 153         int ret;
 154
 155         while (count--) {
 156                 q->data_values[q->fill_count++] = data;
 157                 if (q->fill_count == q->alloc_count) {
 158                         ret = feed_queue_analog_flush(q);
 159                         if (ret != SR_OK)
 160                                 return ret;
 161                 }
 162         }
 163
 164         return SR_OK;
 165 }
 166
 167 SR_API int feed_queue_analog_flush(struct feed_queue_analog *q)
 168 {
 169         int ret;
 170
 171         if (!q->fill_count)
 172                 return SR_OK;
 173
 174         q->analog.num_samples = q->fill_count;
 175         ret = sr_session_send(q->sdi, &q->packet);
 176         if (ret != SR_OK)
 177                 return ret;
 178         q->fill_count = 0;
 179
 180         return SR_OK;
 181 }
 182
 183 SR_API void feed_queue_analog_free(struct feed_queue_analog *q)
 184 {
 185
 186         if (!q)
 187                 return;
 188
 189         g_free(q->data_values);
 190         g_slist_free(q->channels);
 191         g_free(q);
 192 }