hardware/kecheng-kc-330b/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   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 <string.h>
  21 #include "protocol.h"
  22
  23 extern struct sr_dev_driver kecheng_kc_330b_driver_info;
  24 static struct sr_dev_driver *di = &kecheng_kc_330b_driver_info;
  25 extern const uint64_t kecheng_kc_330b_sample_intervals[][2];
  26
  27 SR_PRIV int kecheng_kc_330b_handle_events(int fd, int revents, void *cb_data)
  28 {
  29         struct drv_context *drvc;
  30         struct dev_context *devc;
  31         struct sr_datafeed_packet packet;
  32         struct sr_dev_inst *sdi;
  33         struct sr_usb_dev_inst *usb;
  34         struct timeval tv;
  35         const uint64_t *intv_entry;
  36         gint64 now, interval;
  37         int len, ret, i;
  38         unsigned char cmd;
  39
  40         (void)fd;
  41         (void)revents;
  42
  43         drvc = di->priv;
  44         sdi = cb_data;
  45         devc = sdi->priv;
  46         usb = sdi->conn;
  47
  48         memset(&tv, 0, sizeof(struct timeval));
  49         libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
  50                                                NULL);
  51
  52         if (sdi->status == SR_ST_STOPPING) {
  53                 libusb_free_transfer(devc->xfer);
  54                 for (i = 0; devc->usbfd[i] != -1; i++)
  55                         sr_source_remove(devc->usbfd[i]);
  56                 packet.type = SR_DF_END;
  57                 sr_session_send(cb_data, &packet);
  58                 sdi->status = SR_ST_ACTIVE;
  59                 return TRUE;
  60         }
  61
  62         if (devc->state == LIVE_SPL_IDLE) {
  63                 now = g_get_monotonic_time() / 1000;
  64                 intv_entry = kecheng_kc_330b_sample_intervals[devc->sample_interval];
  65                 interval = intv_entry[0] * 1000 / intv_entry[1];
  66                 if (now - devc->last_live_request > interval) {
  67                         cmd = CMD_GET_LIVE_SPL;
  68                         ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, &cmd, 1, &len, 5);
  69                         if (ret != 0 || len != 1) {
  70                                 sr_dbg("Failed to request new acquisition: %s",
  71                                                 libusb_error_name(ret));
  72                                 sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
  73                                                 devc->cb_data);
  74                                 return TRUE;
  75                         }
  76                         libusb_submit_transfer(devc->xfer);
  77                         devc->last_live_request = now;
  78                         devc->state = LIVE_SPL_WAIT;
  79                 }
  80         }
  81
  82         return TRUE;
  83 }
  84
  85 static void send_data(const struct sr_dev_inst *sdi, void *buf, unsigned int buf_len)
  86 {
  87         struct dev_context *devc;
  88         struct sr_datafeed_packet packet;
  89         struct sr_datafeed_analog analog;
  90
  91         devc = sdi->priv;
  92
  93         memset(&analog, 0, sizeof(struct sr_datafeed_analog));
  94         analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
  95         analog.mqflags = devc->mqflags;
  96         analog.unit = SR_UNIT_DECIBEL_SPL;
  97         analog.probes = sdi->probes;
  98         analog.num_samples = buf_len;
  99         analog.data = buf;
 100         packet.type = SR_DF_ANALOG;
 101         packet.payload = &analog;
 102         sr_session_send(devc->cb_data, &packet);
 103
 104 }
 105
 106 SR_PRIV void kecheng_kc_330b_receive_transfer(struct libusb_transfer *transfer)
 107 {
 108         struct dev_context *devc;
 109         struct sr_dev_inst *sdi;
 110         float fvalue;
 111         int packet_has_error;
 112
 113         sdi = transfer->user_data;
 114         devc = sdi->priv;
 115
 116         packet_has_error = FALSE;
 117         switch (transfer->status) {
 118         case LIBUSB_TRANSFER_NO_DEVICE:
 119                 /* USB device was unplugged. */
 120                 sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
 121                                 devc->cb_data);
 122                 return;
 123         case LIBUSB_TRANSFER_COMPLETED:
 124         case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though */
 125                 break;
 126         default:
 127                 packet_has_error = TRUE;
 128                 break;
 129         }
 130
 131         if (!packet_has_error) {
 132                 if (devc->state == LIVE_SPL_WAIT) {
 133                         if (transfer->actual_length != 3 || transfer->buffer[0] != 0x88) {
 134                                 sr_dbg("Received invalid SPL packet.");
 135                         } else {
 136                                 fvalue = ((transfer->buffer[1] << 8) + transfer->buffer[2]) / 10.0;
 137                                 send_data(sdi, &fvalue, 1);
 138                                 devc->num_samples++;
 139                                 if (devc->limit_samples && devc->num_samples >= devc->limit_samples)
 140                                         sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
 141                                                         devc->cb_data);
 142
 143                                 /* let USB event handler fire off another
 144                                  * request when the time is right. */
 145                                 devc->state = LIVE_SPL_IDLE;
 146                         }
 147                 }
 148         }
 149
 150
 151 }
 152
 153 SR_PRIV int kecheng_kc_330b_configure(const struct sr_dev_inst *sdi)
 154 {
 155         struct dev_context *devc;
 156         struct sr_usb_dev_inst *usb;
 157         int len, ret;
 158         unsigned char buf[7];
 159
 160         sr_dbg("Configuring device.");
 161
 162         usb = sdi->conn;
 163         devc = sdi->priv;
 164
 165         buf[0] = CMD_CONFIGURE;
 166         buf[1] = devc->sample_interval;
 167         buf[2] = devc->alarm_low;
 168         buf[3] = devc->alarm_high;
 169         buf[4] = devc->mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_F ? 0 : 1;
 170         buf[5] = devc->mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_A ? 0 : 1;
 171         buf[6] = devc->data_source;
 172         ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, buf, 7, &len, 5);
 173         if (ret != 0 || len != 7) {
 174                 sr_dbg("Failed to configure device: %s", libusb_error_name(ret));
 175                 return SR_ERR;
 176         }
 177
 178         /* The configure command ack takes about 32ms to come in. */
 179         ret = libusb_bulk_transfer(usb->devhdl, EP_IN, buf, 1, &len, 40);
 180         if (ret != 0 || len != 1) {
 181                 sr_dbg("Failed to configure device (no ack): %s", libusb_error_name(ret));
 182                 return SR_ERR;
 183         }
 184         if (buf[0] != (CMD_CONFIGURE | 0x80)) {
 185                 sr_dbg("Failed to configure device: invalid response 0x%2.x", buf[0]);
 186                 return SR_ERR;
 187         }
 188
 189         return SR_OK;
 190 }
 191
 192 SR_PRIV int kecheng_kc_330b_set_date_time(struct sr_dev_inst *sdi)
 193 {
 194         struct sr_usb_dev_inst *usb;
 195         GDateTime *dt;
 196         int len, ret;
 197         unsigned char buf[7];
 198
 199         sr_dbg("Setting device date/time.");
 200
 201         usb = sdi->conn;
 202
 203         dt = g_date_time_new_now_local();
 204         buf[0] = CMD_SET_DATE_TIME;
 205         buf[1] = g_date_time_get_year(dt) - 2000;
 206         buf[2] = g_date_time_get_month(dt);
 207         buf[3] = g_date_time_get_day_of_month(dt);
 208         buf[4] = g_date_time_get_hour(dt);
 209         buf[5] = g_date_time_get_minute(dt);
 210         buf[6] = g_date_time_get_second(dt);
 211         g_date_time_unref(dt);
 212         ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, buf, 7, &len, 5);
 213         if (ret != 0 || len != 7) {
 214                 sr_dbg("Failed to set date/time: %s", libusb_error_name(ret));
 215                 return SR_ERR;
 216         }
 217
 218         ret = libusb_bulk_transfer(usb->devhdl, EP_IN, buf, 1, &len, 10);
 219         if (ret != 0 || len != 1) {
 220                 sr_dbg("Failed to set date/time (no ack): %s", libusb_error_name(ret));
 221                 return SR_ERR;
 222         }
 223         if (buf[0] != (CMD_SET_DATE_TIME | 0x80)) {
 224                 sr_dbg("Failed to set date/time: invalid response 0x%2.x", buf[0]);
 225                 return SR_ERR;
 226         }
 227
 228
 229
 230         return SR_OK;
 231 }
 232
 233 SR_PRIV int kecheng_kc_330b_recording_get(const struct sr_dev_inst *sdi,
 234                 gboolean *tmp)
 235 {
 236
 237         return SR_OK;
 238 }