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libsigrok/hardware/serial-dmm/protocol.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <errno.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"
static void log_dmm_packet(const uint8_t *buf)
{
sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x"
" %02x %02x %02x %02x %02x %02x %02x",
buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6],
buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);
}
static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi,
int dmm, void *info)
{
float floatval;
struct sr_datafeed_packet packet;
struct sr_datafeed_analog analog;
struct dev_context *devc;
log_dmm_packet(buf);
devc = sdi->priv;
memset(&analog, 0, sizeof(struct sr_datafeed_analog));
analog.channels = sdi->channels;
analog.num_samples = 1;
analog.mq = -1;
dmms[dmm].packet_parse(buf, &floatval, &analog, info);
analog.data = &floatval;
/* If this DMM needs additional handling, call the resp. function. */
if (dmms[dmm].dmm_details)
dmms[dmm].dmm_details(&analog, info);
if (analog.mq != -1) {
/* Got a measurement. */
packet.type = SR_DF_ANALOG;
packet.payload = &analog;
sr_session_send(devc->cb_data, &packet);
devc->num_samples++;
}
}
/** Request packet, if required. */
SR_PRIV int req_packet(struct sr_dev_inst *sdi, int dmm)
{
struct dev_context *devc;
struct sr_serial_dev_inst *serial;
int ret;
if (!dmms[dmm].packet_request)
return SR_OK;
devc = sdi->priv;
serial = sdi->conn;
if (devc->req_next_at && (devc->req_next_at > g_get_monotonic_time())) {
sr_spew("Not requesting new packet yet, %" PRIi64 " ms left.",
((devc->req_next_at - g_get_monotonic_time()) / 1000));
return SR_OK;
}
ret = dmms[dmm].packet_request(serial);
if (ret < 0) {
sr_err("Failed to request packet: %d.", ret);
return ret;
}
if (dmms[dmm].req_timeout_ms)
devc->req_next_at = g_get_monotonic_time() + (dmms[dmm].req_timeout_ms * 1000);
return SR_OK;
}
static void handle_new_data(struct sr_dev_inst *sdi, int dmm, void *info)
{
struct dev_context *devc;
int len, i, offset = 0;
struct sr_serial_dev_inst *serial;
devc = sdi->priv;
serial = sdi->conn;
/* Try to get as much data as the buffer can hold. */
len = DMM_BUFSIZE - devc->buflen;
len = serial_read(serial, devc->buf + devc->buflen, len);
if (len == 0)
return; /* No new bytes, nothing to do. */
if (len < 0) {
sr_err("Serial port read error: %d.", len);
return;
}
devc->buflen += len;
/* Now look for packets in that data. */
while ((devc->buflen - offset) >= dmms[dmm].packet_size) {
if (dmms[dmm].packet_valid(devc->buf + offset)) {
handle_packet(devc->buf + offset, sdi, dmm, info);
offset += dmms[dmm].packet_size;
/* Request next packet, if required. */
if (!dmms[dmm].packet_request)
break;
if (dmms[dmm].req_timeout_ms || dmms[dmm].req_delay_ms)
devc->req_next_at = g_get_monotonic_time() +
dmms[dmm].req_delay_ms * 1000;
req_packet(sdi, dmm);
} else {
offset++;
}
}
/* If we have any data left, move it to the beginning of our buffer. */
for (i = 0; i < devc->buflen - offset; i++)
devc->buf[i] = devc->buf[offset + i];
devc->buflen -= offset;
}
static int receive_data(int fd, int revents, int dmm, void *info, void *cb_data)
{
struct sr_dev_inst *sdi;
struct dev_context *devc;
int64_t time;
(void)fd;
if (!(sdi = cb_data))
return TRUE;
if (!(devc = sdi->priv))
return TRUE;
if (revents == G_IO_IN) {
/* Serial data arrived. */
handle_new_data(sdi, dmm, info);
} else {
/* Timeout; send another packet request if DMM needs it. */
if (dmms[dmm].packet_request && (req_packet(sdi, dmm) < 0))
return FALSE;
}
if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
sr_info("Requested number of samples reached.");
sdi->driver->dev_acquisition_stop(sdi, cb_data);
return TRUE;
}
if (devc->limit_msec) {
time = (g_get_monotonic_time() - devc->starttime) / 1000;
if (time > (int64_t)devc->limit_msec) {
sr_info("Requested time limit reached.");
sdi->driver->dev_acquisition_stop(sdi, cb_data);
return TRUE;
}
}
return TRUE;
}
#define RECEIVE_DATA(ID_UPPER, DMM_DRIVER) \
SR_PRIV int receive_data_##ID_UPPER(int fd, int revents, void *cb_data) { \
struct DMM_DRIVER##_info info; \
return receive_data(fd, revents, ID_UPPER, &info, cb_data); }
/* Driver-specific receive_data() wrappers */
RECEIVE_DATA(BBCGM_M2110, metex14) /* metex14_info used as a dummy. */
RECEIVE_DATA(DIGITEK_DT4000ZC, fs9721)
RECEIVE_DATA(TEKPOWER_TP4000ZC, fs9721)
RECEIVE_DATA(METEX_ME31, metex14)
RECEIVE_DATA(PEAKTECH_3410, metex14)
RECEIVE_DATA(MASTECH_MAS345, metex14)
RECEIVE_DATA(VA_VA18B, fs9721)
RECEIVE_DATA(VA_VA40B, fs9721)
RECEIVE_DATA(METEX_M3640D, metex14)
RECEIVE_DATA(METEX_M4650CR, metex14)
RECEIVE_DATA(PEAKTECH_4370, metex14)
RECEIVE_DATA(PCE_PCE_DM32, fs9721)
RECEIVE_DATA(RADIOSHACK_22_168, metex14)
RECEIVE_DATA(RADIOSHACK_22_805, metex14)
RECEIVE_DATA(RADIOSHACK_22_812, rs9lcd)
RECEIVE_DATA(TECPEL_DMM_8061_SER, fs9721)
RECEIVE_DATA(VOLTCRAFT_M3650CR, metex14)
RECEIVE_DATA(VOLTCRAFT_M3650D, metex14)
RECEIVE_DATA(VOLTCRAFT_M4650CR, metex14)
RECEIVE_DATA(VOLTCRAFT_ME42, metex14)
RECEIVE_DATA(VOLTCRAFT_VC820_SER, fs9721)
RECEIVE_DATA(VOLTCRAFT_VC830_SER, fs9922)
RECEIVE_DATA(VOLTCRAFT_VC840_SER, fs9721)
RECEIVE_DATA(UNI_T_UT60A_SER, fs9721)
RECEIVE_DATA(UNI_T_UT60E_SER, fs9721)
RECEIVE_DATA(UNI_T_UT60G_SER, es519xx)
RECEIVE_DATA(UNI_T_UT61B_SER, fs9922)
RECEIVE_DATA(UNI_T_UT61C_SER, fs9922)
RECEIVE_DATA(UNI_T_UT61D_SER, fs9922)
RECEIVE_DATA(UNI_T_UT61E_SER, es519xx)
RECEIVE_DATA(ISO_TECH_IDM103N, es519xx)
RECEIVE_DATA(TENMA_72_7745_SER, fs9721)
RECEIVE_DATA(TENMA_72_7750_SER, es519xx)
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