src/hardware/korad-kaxxxxp/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2015 Hannu Vuolasaho <vuokkosetae@gmail.com>
   5  * Copyright (C) 2018 Frank Stettner <frank-stettner@gmx.net>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include "protocol.h"
  23
  24 #define REQ_TIMEOUT_MS 500
  25 #define DEVICE_PROCESSING_TIME_MS 80
  26
  27 SR_PRIV int korad_kaxxxxp_send_cmd(struct sr_serial_dev_inst *serial,
  28                                 const char *cmd)
  29 {
  30         int ret;
  31
  32         sr_dbg("Sending '%s'.", cmd);
  33         if ((ret = serial_write_blocking(serial, cmd, strlen(cmd), 0)) < 0) {
  34                 sr_err("Error sending command: %d.", ret);
  35                 return ret;
  36         }
  37
  38         return ret;
  39 }
  40
  41 SR_PRIV int korad_kaxxxxp_read_chars(struct sr_serial_dev_inst *serial,
  42                                 int count, char *buf)
  43 {
  44         int ret, received, turns;
  45
  46         received = 0;
  47         turns = 0;
  48
  49         do {
  50                 if ((ret = serial_read_blocking(serial, buf + received,
  51                                 count - received,
  52                                 serial_timeout(serial, count))) < 0) {
  53                         sr_err("Error %d reading %d bytes from device.",
  54                                ret, count);
  55                         return ret;
  56                 }
  57                 received += ret;
  58                 turns++;
  59         } while ((received < count) && (turns < 100));
  60
  61         buf[count] = 0;
  62
  63         sr_spew("Received: '%s'.", buf);
  64
  65         return ret;
  66 }
  67
  68 static void give_device_time_to_process(struct dev_context *devc)
  69 {
  70         int64_t sleeping_time;
  71
  72         sleeping_time = devc->req_sent_at + (DEVICE_PROCESSING_TIME_MS * 1000);
  73         sleeping_time -= g_get_monotonic_time();
  74
  75         if (sleeping_time > 0) {
  76                 g_usleep(sleeping_time);
  77                 sr_spew("Sleeping for processing %" PRIi64 " usec", sleeping_time);
  78         }
  79 }
  80
  81 SR_PRIV int korad_kaxxxxp_set_value(struct sr_serial_dev_inst *serial,
  82                                 int target, struct dev_context *devc)
  83 {
  84         char *msg;
  85         const char *cmd;
  86         float value;
  87         int ret;
  88
  89         g_mutex_lock(&devc->rw_mutex);
  90         give_device_time_to_process(devc);
  91
  92         switch (target) {
  93         case KAXXXXP_CURRENT:
  94         case KAXXXXP_VOLTAGE:
  95         case KAXXXXP_STATUS:
  96                 sr_err("Can't set measurable parameter %d.", target);
  97                 g_mutex_unlock(&devc->rw_mutex);
  98                 return SR_ERR;
  99         case KAXXXXP_CURRENT_LIMIT:
 100                 cmd = "ISET1:%05.3f";
 101                 value = devc->set_current_limit;
 102                 break;
 103         case KAXXXXP_VOLTAGE_TARGET:
 104                 cmd = "VSET1:%05.2f";
 105                 value = devc->set_voltage_target;
 106                 break;
 107         case KAXXXXP_OUTPUT:
 108                 cmd = "OUT%01.0f";
 109                 value = (devc->set_output_enabled) ? 1 : 0;
 110                 /* Set value back to recognize changes */
 111                 devc->output_enabled = devc->set_output_enabled;
 112                 break;
 113         case KAXXXXP_BEEP:
 114                 cmd = "BEEP%01.0f";
 115                 value = (devc->set_beep_enabled) ? 1 : 0;
 116                 break;
 117         case KAXXXXP_OCP:
 118                 cmd = "OCP%01.0f";
 119                 value = (devc->set_ocp_enabled) ? 1 : 0;
 120                 /* Set value back to recognize changes */
 121                 devc->ocp_enabled = devc->set_ocp_enabled;
 122                 break;
 123         case KAXXXXP_OVP:
 124                 cmd = "OVP%01.0f";
 125                 value = (devc->set_ovp_enabled) ? 1 : 0;
 126                 /* Set value back to recognize changes */
 127                 devc->ovp_enabled = devc->set_ovp_enabled;
 128                 break;
 129         case KAXXXXP_SAVE:
 130                 cmd = "SAV%01.0f";
 131                 if (devc->program < 1 || devc->program > 5) {
 132                         sr_err("Only programs 1-5 supported and %d isn't "
 133                                "between them.", devc->program);
 134                         g_mutex_unlock(&devc->rw_mutex);
 135                         return SR_ERR;
 136                 }
 137                 value = devc->program;
 138                 break;
 139         case KAXXXXP_RECALL:
 140                 cmd = "RCL%01.0f";
 141                 if (devc->program < 1 || devc->program > 5) {
 142                         sr_err("Only programs 1-5 supported and %d isn't "
 143                                "between them.", devc->program);
 144                         g_mutex_unlock(&devc->rw_mutex);
 145                         return SR_ERR;
 146                 }
 147                 value = devc->program;
 148                 break;
 149         default:
 150                 sr_err("Don't know how to set %d.", target);
 151                 g_mutex_unlock(&devc->rw_mutex);
 152                 return SR_ERR;
 153         }
 154
 155         msg = g_malloc0(20 + 1);
 156         if (cmd)
 157                 sr_snprintf_ascii(msg, 20, cmd, value);
 158
 159         ret = korad_kaxxxxp_send_cmd(serial, msg);
 160         devc->req_sent_at = g_get_monotonic_time();
 161         g_free(msg);
 162
 163         g_mutex_unlock(&devc->rw_mutex);
 164
 165         return ret;
 166 }
 167
 168 SR_PRIV int korad_kaxxxxp_get_value(struct sr_serial_dev_inst *serial,
 169                                 int target, struct dev_context *devc)
 170 {
 171         int ret, count;
 172         char reply[6];
 173         float *value;
 174         char status_byte;
 175
 176         g_mutex_lock(&devc->rw_mutex);
 177         give_device_time_to_process(devc);
 178
 179         value = NULL;
 180         count = 5;
 181
 182         switch (target) {
 183         case KAXXXXP_CURRENT:
 184                 /* Read current from device. */
 185                 ret = korad_kaxxxxp_send_cmd(serial, "IOUT1?");
 186                 value = &(devc->current);
 187                 break;
 188         case KAXXXXP_CURRENT_LIMIT:
 189                 /* Read set current from device. */
 190                 ret = korad_kaxxxxp_send_cmd(serial, "ISET1?");
 191                 value = &(devc->current_limit);
 192                 break;
 193         case KAXXXXP_VOLTAGE:
 194                 /* Read voltage from device. */
 195                 ret = korad_kaxxxxp_send_cmd(serial, "VOUT1?");
 196                 value = &(devc->voltage);
 197                 break;
 198         case KAXXXXP_VOLTAGE_TARGET:
 199                 /* Read set voltage from device. */
 200                 ret = korad_kaxxxxp_send_cmd(serial, "VSET1?");
 201                 value = &(devc->voltage_target);
 202                 break;
 203         case KAXXXXP_STATUS:
 204         case KAXXXXP_OUTPUT:
 205         case KAXXXXP_OCP:
 206         case KAXXXXP_OVP:
 207                 /* Read status from device. */
 208                 ret = korad_kaxxxxp_send_cmd(serial, "STATUS?");
 209                 count = 1;
 210                 break;
 211         default:
 212                 sr_err("Don't know how to query %d.", target);
 213                 g_mutex_unlock(&devc->rw_mutex);
 214                 return SR_ERR;
 215         }
 216
 217         devc->req_sent_at = g_get_monotonic_time();
 218
 219         if ((ret = korad_kaxxxxp_read_chars(serial, count, reply)) < 0) {
 220                 g_mutex_unlock(&devc->rw_mutex);
 221                 return ret;
 222         }
 223
 224         reply[count] = 0;
 225
 226         if (value) {
 227                 sr_atof_ascii((const char *)&reply, value);
 228                 sr_dbg("value: %f", *value);
 229         } else {
 230                 /* We have status reply. */
 231                 status_byte = reply[0];
 232                 /* Constant current */
 233                 devc->cc_mode[0] = !(status_byte & (1 << 0)); /* Channel one */
 234                 devc->cc_mode[1] = !(status_byte & (1 << 1)); /* Channel two */
 235                 /*
 236                  * Tracking
 237                  * status_byte & ((1 << 2) | (1 << 3))
 238                  * 00 independent 01 series 11 parallel
 239                  */
 240                 devc->beep_enabled = (1 << 4);
 241                 devc->ocp_enabled = (status_byte & (1 << 5));
 242                 devc->output_enabled = (status_byte & (1 << 6));
 243                 /* Velleman LABPS3005 quirk */
 244                 if (devc->output_enabled)
 245                         devc->ovp_enabled = (status_byte & (1 << 7));
 246                 sr_dbg("Status: 0x%02x", status_byte);
 247                 sr_spew("Status: CH1: constant %s CH2: constant %s. "
 248                         "Tracking would be %s. Device is "
 249                         "%s and %s. Buttons are %s. Output is %s "
 250                         "and extra bit is %s.",
 251                         (status_byte & (1 << 0)) ? "voltage" : "current",
 252                         (status_byte & (1 << 1)) ? "voltage" : "current",
 253                         (status_byte & (1 << 2)) ? "parallel" : "series",
 254                         (status_byte & (1 << 3)) ? "tracking" : "independent",
 255                         (status_byte & (1 << 4)) ? "beeping" : "silent",
 256                         (status_byte & (1 << 5)) ? "locked" : "unlocked",
 257                         (status_byte & (1 << 6)) ? "enabled" : "disabled",
 258                         (status_byte & (1 << 7)) ? "true" : "false");
 259         }
 260
 261         /* Read the sixth byte from ISET? BUG workaround. */
 262         if (target == KAXXXXP_CURRENT_LIMIT)
 263                 serial_read_blocking(serial, &status_byte, 1, 10);
 264
 265         g_mutex_unlock(&devc->rw_mutex);
 266
 267         return ret;
 268 }
 269
 270 SR_PRIV int korad_kaxxxxp_get_all_values(struct sr_serial_dev_inst *serial,
 271                                 struct dev_context *devc)
 272 {
 273         int ret, target;
 274
 275         for (target = KAXXXXP_CURRENT;
 276                         target <= KAXXXXP_STATUS; target++) {
 277                 if ((ret = korad_kaxxxxp_get_value(serial, target, devc)) < 0)
 278                         return ret;
 279         }
 280
 281         return ret;
 282 }
 283
 284 static void next_measurement(struct dev_context *devc)
 285 {
 286         switch (devc->acquisition_target) {
 287         case KAXXXXP_CURRENT:
 288                 devc->acquisition_target = KAXXXXP_VOLTAGE;
 289                 break;
 290         case KAXXXXP_VOLTAGE:
 291                 devc->acquisition_target = KAXXXXP_STATUS;
 292                 break;
 293         case KAXXXXP_STATUS:
 294                 devc->acquisition_target = KAXXXXP_CURRENT;
 295                 break;
 296         default:
 297                 devc->acquisition_target = KAXXXXP_CURRENT;
 298                 sr_err("Invalid target for next acquisition.");
 299         }
 300 }
 301
 302 SR_PRIV int korad_kaxxxxp_receive_data(int fd, int revents, void *cb_data)
 303 {
 304         struct sr_dev_inst *sdi;
 305         struct dev_context *devc;
 306         struct sr_serial_dev_inst *serial;
 307         struct sr_datafeed_packet packet;
 308         struct sr_datafeed_analog analog;
 309         struct sr_analog_encoding encoding;
 310         struct sr_analog_meaning meaning;
 311         struct sr_analog_spec spec;
 312         GSList *l;
 313
 314         (void)fd;
 315         (void)revents;
 316
 317         if (!(sdi = cb_data))
 318                 return TRUE;
 319
 320         if (!(devc = sdi->priv))
 321                 return TRUE;
 322
 323         serial = sdi->conn;
 324
 325         /* Get the value. */
 326         korad_kaxxxxp_get_value(serial, devc->acquisition_target, devc);
 327
 328         /* Note: digits/spec_digits will be overridden later. */
 329         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 330
 331         /* Send the value forward. */
 332         packet.type = SR_DF_ANALOG;
 333         packet.payload = &analog;
 334         analog.num_samples = 1;
 335         l = g_slist_copy(sdi->channels);
 336         if (devc->acquisition_target == KAXXXXP_CURRENT) {
 337                 l = g_slist_remove_link(l, g_slist_nth(l, 0));
 338                 analog.meaning->channels = l;
 339                 analog.meaning->mq = SR_MQ_CURRENT;
 340                 analog.meaning->unit = SR_UNIT_AMPERE;
 341                 analog.meaning->mqflags = SR_MQFLAG_DC;
 342                 analog.encoding->digits = 3;
 343                 analog.spec->spec_digits = 3;
 344                 analog.data = &devc->current;
 345                 sr_session_send(sdi, &packet);
 346         } else if (devc->acquisition_target == KAXXXXP_VOLTAGE) {
 347                 l = g_slist_remove_link(l, g_slist_nth(l, 1));
 348                 analog.meaning->channels = l;
 349                 analog.meaning->mq = SR_MQ_VOLTAGE;
 350                 analog.meaning->unit = SR_UNIT_VOLT;
 351                 analog.meaning->mqflags = SR_MQFLAG_DC;
 352                 analog.encoding->digits = 2;
 353                 analog.spec->spec_digits = 2;
 354                 analog.data = &devc->voltage;
 355                 sr_session_send(sdi, &packet);
 356                 sr_sw_limits_update_samples_read(&devc->limits, 1);
 357         }
 358         next_measurement(devc);
 359
 360         if (sr_sw_limits_check(&devc->limits))
 361                 sr_dev_acquisition_stop(sdi);
 362
 363         return TRUE;
 364 }