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 == 0)
  84                 return; /* No new bytes, nothing to do. */
  85         if (len < 0) {
  86                 sr_err("Serial port read error: %d.", len);
  87                 return;
  88         }
  89         devc->buflen += len;
  90
  91         /* Now look for packets in that data. */
  92         while ((devc->buflen - offset) >= dmms[dmm].packet_size) {
  93                 if (dmms[dmm].packet_valid(devc->buf + offset)) {
  94                         handle_packet(devc->buf + offset, sdi, dmm, info);
  95                         offset += dmms[dmm].packet_size;
  96                 } else {
  97                         offset++;
  98                 }
  99         }
 100
 101         /* If we have any data left, move it to the beginning of our buffer. */
 102         for (i = 0; i < devc->buflen - offset; i++)
 103                 devc->buf[i] = devc->buf[offset + i];
 104         devc->buflen -= offset;
 105 }
 106
 107 static int receive_data(int fd, int revents, int dmm, void *info, void *cb_data)
 108 {
 109         struct sr_dev_inst *sdi;
 110         struct dev_context *devc;
 111         struct sr_serial_dev_inst *serial;
 112         int64_t time;
 113         int ret;
 114
 115         (void)fd;
 116
 117         if (!(sdi = cb_data))
 118                 return TRUE;
 119
 120         if (!(devc = sdi->priv))
 121                 return TRUE;
 122
 123         serial = sdi->conn;
 124
 125         if (revents == G_IO_IN) {
 126                 /* Serial data arrived. */
 127                 handle_new_data(sdi, dmm, info);
 128         } else {
 129                 /* Timeout, send another packet request (if DMM needs it). */
 130                 if (dmms[dmm].packet_request) {
 131                         ret = dmms[dmm].packet_request(serial);
 132                         if (ret < 0) {
 133                                 sr_err("Failed to request packet: %d.", ret);
 134                                 return FALSE;
 135                         }
 136                 }
 137         }
 138
 139         if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
 140                 sr_info("Requested number of samples reached.");
 141                 sdi->driver->dev_acquisition_stop(sdi, cb_data);
 142                 return TRUE;
 143         }
 144
 145         if (devc->limit_msec) {
 146                 time = (g_get_monotonic_time() - devc->starttime) / 1000;
 147                 if (time > (int64_t)devc->limit_msec) {
 148                         sr_info("Requested time limit reached.");
 149                         sdi->driver->dev_acquisition_stop(sdi, cb_data);
 150                         return TRUE;
 151                 }
 152         }
 153
 154         return TRUE;
 155 }
 156
 157 #define RECEIVE_DATA(ID_UPPER, DMM_DRIVER) \
 158 SR_PRIV int receive_data_##ID_UPPER(int fd, int revents, void *cb_data) { \
 159         struct DMM_DRIVER##_info info; \
 160         return receive_data(fd, revents, ID_UPPER, &info, cb_data); }
 161
 162 /* Driver-specific receive_data() wrappers */
 163 RECEIVE_DATA(BBCGM_M2110, metex14) /* metex14_info used as a dummy. */
 164 RECEIVE_DATA(DIGITEK_DT4000ZC, fs9721)
 165 RECEIVE_DATA(TEKPOWER_TP4000ZC, fs9721)
 166 RECEIVE_DATA(METEX_ME31, metex14)
 167 RECEIVE_DATA(PEAKTECH_3410, metex14)
 168 RECEIVE_DATA(MASTECH_MAS345, metex14)
 169 RECEIVE_DATA(VA_VA18B, fs9721)
 170 RECEIVE_DATA(VA_VA40B, fs9721)
 171 RECEIVE_DATA(METEX_M3640D, metex14)
 172 RECEIVE_DATA(METEX_M4650CR, metex14)
 173 RECEIVE_DATA(PEAKTECH_4370, metex14)
 174 RECEIVE_DATA(PCE_PCE_DM32, fs9721)
 175 RECEIVE_DATA(RADIOSHACK_22_168, metex14)
 176 RECEIVE_DATA(RADIOSHACK_22_805, metex14)
 177 RECEIVE_DATA(RADIOSHACK_22_812, rs9lcd)
 178 RECEIVE_DATA(TECPEL_DMM_8061_SER, fs9721)
 179 RECEIVE_DATA(VOLTCRAFT_M3650CR, metex14)
 180 RECEIVE_DATA(VOLTCRAFT_M3650D, metex14)
 181 RECEIVE_DATA(VOLTCRAFT_M4650CR, metex14)
 182 RECEIVE_DATA(VOLTCRAFT_ME42, metex14)
 183 RECEIVE_DATA(VOLTCRAFT_VC820_SER, fs9721)
 184 RECEIVE_DATA(VOLTCRAFT_VC830_SER, fs9922)
 185 RECEIVE_DATA(VOLTCRAFT_VC840_SER, fs9721)
 186 RECEIVE_DATA(UNI_T_UT60A_SER, fs9721)
 187 RECEIVE_DATA(UNI_T_UT60E_SER, fs9721)
 188 RECEIVE_DATA(UNI_T_UT60G_SER, es519xx)
 189 RECEIVE_DATA(UNI_T_UT61B_SER, fs9922)
 190 RECEIVE_DATA(UNI_T_UT61C_SER, fs9922)
 191 RECEIVE_DATA(UNI_T_UT61D_SER, fs9922)
 192 RECEIVE_DATA(UNI_T_UT61E_SER, es519xx)
 193 RECEIVE_DATA(ISO_TECH_IDM103N, es519xx)
 194 RECEIVE_DATA(TENMA_72_7745_SER, fs9721)
 195 RECEIVE_DATA(TENMA_72_7750_SER, es519xx)