hardware/serial-dmm/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
   5  * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
   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 <stdlib.h>
  22 #include <math.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <glib.h>
  26 #include "libsigrok.h"
  27 #include "libsigrok-internal.h"
  28 #include "protocol.h"
  29
  30 static void log_dmm_packet(const uint8_t *buf)
  31 {
  32         sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x"
  33                " %02x %02x %02x %02x %02x %02x %02x",
  34                buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6],
  35                buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);
  36 }
  37
  38 static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi,
  39                           int dmm, void *info)
  40 {
  41         float floatval;
  42         struct sr_datafeed_packet packet;
  43         struct sr_datafeed_analog analog;
  44         struct dev_context *devc;
  45
  46         log_dmm_packet(buf);
  47         devc = sdi->priv;
  48
  49         memset(&analog, 0, sizeof(struct sr_datafeed_analog));
  50
  51         analog.probes = sdi->probes;
  52         analog.num_samples = 1;
  53         analog.mq = -1;
  54
  55         dmms[dmm].packet_parse(buf, &floatval, &analog, info);
  56         analog.data = &floatval;
  57
  58         /* If this DMM needs additional handling, call the resp. function. */
  59         if (dmms[dmm].dmm_details)
  60                 dmms[dmm].dmm_details(&analog, info);
  61
  62         if (analog.mq != -1) {
  63                 /* Got a measurement. */
  64                 packet.type = SR_DF_ANALOG;
  65                 packet.payload = &analog;
  66                 sr_session_send(devc->cb_data, &packet);
  67                 devc->num_samples++;
  68         }
  69 }
  70
  71 static void handle_new_data(struct sr_dev_inst *sdi, int dmm, void *info)
  72 {
  73         struct dev_context *devc;
  74         int len, i, offset = 0;
  75         struct sr_serial_dev_inst *serial;
  76
  77         devc = sdi->priv;
  78         serial = sdi->conn;
  79
  80         /* Try to get as much data as the buffer can hold. */
  81         len = DMM_BUFSIZE - devc->buflen;
  82         len = serial_read(serial, devc->buf + devc->buflen, len);
  83         if (len < 1) {
  84                 sr_err("Serial port read error: %d.", len);
  85                 return;
  86         }
  87         devc->buflen += len;
  88
  89         /* Now look for packets in that data. */
  90         while ((devc->buflen - offset) >= dmms[dmm].packet_size) {
  91                 if (dmms[dmm].packet_valid(devc->buf + offset)) {
  92                         handle_packet(devc->buf + offset, sdi, dmm, info);
  93                         offset += dmms[dmm].packet_size;
  94                 } else {
  95                         offset++;
  96                 }
  97         }
  98
  99         /* If we have any data left, move it to the beginning of our buffer. */
 100         for (i = 0; i < devc->buflen - offset; i++)
 101                 devc->buf[i] = devc->buf[offset + i];
 102         devc->buflen -= offset;
 103 }
 104
 105 static int receive_data(int fd, int revents, int dmm, void *info, void *cb_data)
 106 {
 107         struct sr_dev_inst *sdi;
 108         struct dev_context *devc;
 109         struct sr_serial_dev_inst *serial;
 110         int64_t time;
 111         int ret;
 112
 113         (void)fd;
 114
 115         if (!(sdi = cb_data))
 116                 return TRUE;
 117
 118         if (!(devc = sdi->priv))
 119                 return TRUE;
 120
 121         serial = sdi->conn;
 122
 123         if (revents == G_IO_IN) {
 124                 /* Serial data arrived. */
 125                 handle_new_data(sdi, dmm, info);
 126         } else {
 127                 /* Timeout, send another packet request (if DMM needs it). */
 128                 if (dmms[dmm].packet_request) {
 129                         ret = dmms[dmm].packet_request(serial);
 130                         if (ret < 0) {
 131                                 sr_err("Failed to request packet: %d.", ret);
 132                                 return FALSE;
 133                         }
 134                 }
 135         }
 136
 137         if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
 138                 sr_info("Requested number of samples reached.");
 139                 sdi->driver->dev_acquisition_stop(sdi, cb_data);
 140                 return TRUE;
 141         }
 142
 143         if (devc->limit_msec) {
 144                 time = (g_get_monotonic_time() - devc->starttime) / 1000;
 145                 if (time > (int64_t)devc->limit_msec) {
 146                         sr_info("Requested time limit reached.");
 147                         sdi->driver->dev_acquisition_stop(sdi, cb_data);
 148                         return TRUE;
 149                 }
 150         }
 151
 152         return TRUE;
 153 }
 154
 155 #define RECEIVE_DATA(ID_UPPER, DMM_DRIVER) \
 156 SR_PRIV int receive_data_##ID_UPPER(int fd, int revents, void *cb_data) { \
 157         struct DMM_DRIVER##_info info; \
 158         return receive_data(fd, revents, ID_UPPER, &info, cb_data); }
 159
 160 /* Driver-specific receive_data() wrappers */
 161 RECEIVE_DATA(DIGITEK_DT4000ZC, fs9721)
 162 RECEIVE_DATA(TEKPOWER_TP4000ZC, fs9721)
 163 RECEIVE_DATA(METEX_ME31, metex14)
 164 RECEIVE_DATA(PEAKTECH_3410, metex14)
 165 RECEIVE_DATA(MASTECH_MAS345, metex14)
 166 RECEIVE_DATA(VA_VA18B, fs9721)
 167 RECEIVE_DATA(METEX_M3640D, metex14)
 168 RECEIVE_DATA(PEAKTECH_4370, metex14)
 169 RECEIVE_DATA(PCE_PCE_DM32, fs9721)
 170 RECEIVE_DATA(RADIOSHACK_22_168, metex14)
 171 RECEIVE_DATA(RADIOSHACK_22_805, metex14)
 172 RECEIVE_DATA(RADIOSHACK_22_812, rs9lcd)
 173 RECEIVE_DATA(TECPEL_DMM_8060_SER, fs9721)
 174 RECEIVE_DATA(TECPEL_DMM_8061_SER, fs9721)
 175 RECEIVE_DATA(VOLTCRAFT_M3650D, metex14)
 176 RECEIVE_DATA(VOLTCRAFT_VC820_SER, fs9721)
 177 RECEIVE_DATA(VOLTCRAFT_VC830_SER, fs9922)
 178 RECEIVE_DATA(VOLTCRAFT_VC840_SER, fs9721)
 179 RECEIVE_DATA(UNI_T_UT61D_SER, fs9922)
 180 RECEIVE_DATA(UNI_T_UT61E_SER, es51922)