libsigrok/hardware/common/dmm/m2110.c

71 lines
1.7 KiB
C

/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
*
* 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/>.
*/
/**
* @file
*
* BBC Goerz Metrawatt M2110 ASCII protocol parser.
*
* Most probably the simplest multimeter protocol ever ;-) .
*/
#include <string.h>
#include <math.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#define LOG_PREFIX "m2110"
SR_PRIV gboolean sr_m2110_packet_valid(const uint8_t *buf)
{
float val;
if ((buf[7] != '\r') || (buf[8] != '\n'))
return FALSE;
if (!strncmp((const char *)buf, "OVERRNG", 7))
return TRUE;
if (sscanf((const char *)buf, "%f", &val) == 1)
return TRUE;
else
return FALSE;
}
SR_PRIV int sr_m2110_parse(const uint8_t *buf, float *floatval,
struct sr_datafeed_analog *analog, void *info)
{
float val;
(void)info;
/* We don't know the unit, so that's the best we can do. */
analog->mq = SR_MQ_GAIN;
analog->unit = SR_UNIT_UNITLESS;
analog->mqflags = 0;
if (!strncmp((const char *)buf, "OVERRNG", 7))
*floatval = INFINITY;
else if (sscanf((const char *)buf, "%f", &val) == 1)
*floatval = val;
return SR_OK;
}