78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
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/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* BBC Goerz Metrawatt M2110 ASCII protocol parser.
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*
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* Most probably the simplest multimeter protocol ever ;-) .
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*/
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#include <string.h>
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#include <math.h>
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#include <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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/* Message logging helpers with subsystem-specific prefix string. */
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#define LOG_PREFIX "bbcgm-m2110: "
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#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
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#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
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#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
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#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
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#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
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#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
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SR_PRIV gboolean sr_m2110_packet_valid(const uint8_t *buf)
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{
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float val;
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if ((buf[7] != '\r') || (buf[8] != '\n'))
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return FALSE;
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if (!strncmp((const char*)buf, "OVERRNG", 7))
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return TRUE;
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if (sscanf((const char*)buf, "%f", &val) == 1)
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return TRUE;
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else
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return FALSE;
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}
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SR_PRIV int sr_m2110_parse(const uint8_t *buf, float *floatval,
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struct sr_datafeed_analog *analog, void *info)
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{
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float val;
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(void)info;
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analog->mq = SR_MQ_GAIN; /* We don't know the unit, so that's the best we can do.*/
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analog->unit = SR_UNIT_UNITLESS;
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analog->mqflags = 0;
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if (!strncmp((const char*)buf, "OVERRNG", 7)) {
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*floatval = INFINITY;
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}
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else if (sscanf((const char*)buf, "%f", &val) == 1)
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*floatval = val;
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return SR_OK;
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}
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