450 lines
13 KiB
C
450 lines
13 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2012-2013 Uwe Hermann <uwe@hermann-uwe.de>
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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 2 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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/**
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* @file
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*
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* Metex 14-bytes ASCII protocol parser.
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*
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* @internal
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* This should work for various multimeters which use this kind of protocol,
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* even though there is some variation in which modes each DMM supports.
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*
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* It does _not_ work for all Metex DMMs, some use a quite different protocol.
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*/
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#include <config.h>
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#include <string.h>
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#include <strings.h>
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#include <ctype.h>
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#include <math.h>
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#include <glib.h>
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#include <libsigrok/libsigrok.h>
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#include "libsigrok-internal.h"
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#define LOG_PREFIX "metex14"
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/** Parse value from buf, byte 2-8. */
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static int parse_value(const uint8_t *buf, struct metex14_info *info,
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float *result, int *exponent)
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{
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int i, is_ol, cnt, dot_pos;
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char valstr[7 + 1];
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/* Strip all spaces from bytes 2-8. */
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memset(&valstr, 0, 7 + 1);
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for (i = 0, cnt = 0; i < 7; i++) {
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if (buf[2 + i] != ' ')
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valstr[cnt++] = buf[2 + i];
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}
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/* Bytes 5-7: Over limit (various forms) */
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is_ol = 0;
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is_ol += (!g_ascii_strcasecmp((const char *)&valstr, ".OL")) ? 1 : 0;
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is_ol += (!g_ascii_strcasecmp((const char *)&valstr, "O.L")) ? 1 : 0;
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is_ol += (!g_ascii_strcasecmp((const char *)&valstr, "OL.")) ? 1 : 0;
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is_ol += (!g_ascii_strcasecmp((const char *)&valstr, "OL")) ? 1 : 0;
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is_ol += (!g_ascii_strcasecmp((const char *)&valstr, "-.OL")) ? 1 : 0;
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is_ol += (!g_ascii_strcasecmp((const char *)&valstr, "-O.L")) ? 1 : 0;
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is_ol += (!g_ascii_strcasecmp((const char *)&valstr, "-OL.")) ? 1 : 0;
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is_ol += (!g_ascii_strcasecmp((const char *)&valstr, "-OL")) ? 1 : 0;
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if (is_ol != 0) {
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sr_spew("Over limit.");
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*result = INFINITY;
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return SR_OK;
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}
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/* Logic functions */
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if (!strcmp((const char *)&valstr, "READY") ||
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!strcmp((const char *)&valstr, "FLOAT")) {
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*result = INFINITY;
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info->is_logic = TRUE;
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} else if (!strcmp((const char *)&valstr, "Hi")) {
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*result = 1.0;
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info->is_logic = TRUE;
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} else if (!strcmp((const char *)&valstr, "Lo")) {
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*result = 0.0;
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info->is_logic = TRUE;
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}
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if (info->is_logic)
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return SR_OK;
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/* Bytes 2-8: Sign, value (up to 5 digits) and decimal point */
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sr_atof_ascii((const char *)&valstr, result);
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dot_pos = strcspn(valstr, ".");
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if (dot_pos < cnt)
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*exponent = -(cnt - dot_pos - 1);
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else
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*exponent = 0;
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sr_spew("The display value is %f.", *result);
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return SR_OK;
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}
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static void parse_flags(const char *buf, struct metex14_info *info)
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{
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int i, cnt;
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char unit[4 + 1];
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const char *u;
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/* Bytes 0-1: Measurement mode AC, DC */
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info->is_ac = !strncmp(buf, "AC", 2);
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info->is_dc = !strncmp(buf, "DC", 2);
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/* Bytes 2-8: See parse_value(). */
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/* Strip all spaces from bytes 9-12. */
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memset(&unit, 0, 4 + 1);
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for (i = 0, cnt = 0; i < 4; i++) {
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if (buf[9 + i] != ' ')
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unit[cnt++] = buf[9 + i];
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}
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/* Bytes 9-12: Unit */
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u = (const char *)&unit;
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if (!g_ascii_strcasecmp(u, "A"))
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info->is_ampere = TRUE;
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else if (!g_ascii_strcasecmp(u, "mA"))
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info->is_milli = info->is_ampere = TRUE;
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else if (!g_ascii_strcasecmp(u, "uA"))
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info->is_micro = info->is_ampere = TRUE;
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else if (!g_ascii_strcasecmp(u, "V"))
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info->is_volt = TRUE;
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else if (!g_ascii_strcasecmp(u, "mV"))
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info->is_milli = info->is_volt = TRUE;
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else if (!g_ascii_strcasecmp(u, "Ohm"))
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info->is_ohm = TRUE;
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else if (!g_ascii_strcasecmp(u, "KOhm"))
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info->is_kilo = info->is_ohm = TRUE;
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else if (!g_ascii_strcasecmp(u, "MOhm"))
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info->is_mega = info->is_ohm = TRUE;
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else if (!g_ascii_strcasecmp(u, "pF"))
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info->is_pico = info->is_farad = TRUE;
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else if (!g_ascii_strcasecmp(u, "nF"))
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info->is_nano = info->is_farad = TRUE;
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else if (!g_ascii_strcasecmp(u, "uF"))
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info->is_micro = info->is_farad = TRUE;
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else if (!g_ascii_strcasecmp(u, "KHz"))
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info->is_kilo = info->is_hertz = TRUE;
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else if (!g_ascii_strcasecmp(u, "C"))
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info->is_celsius = TRUE;
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else if (!g_ascii_strcasecmp(u, "F"))
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info->is_fahrenheit = TRUE;
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else if (!g_ascii_strcasecmp(u, "DB"))
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info->is_decibel = TRUE;
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else if (!g_ascii_strcasecmp(u, "dBm"))
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info->is_decibel_mw = TRUE;
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else if (!g_ascii_strcasecmp(u, "W"))
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info->is_watt = TRUE;
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else if (!g_ascii_strcasecmp(u, ""))
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info->is_unitless = TRUE;
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/* Bytes 0-1: Measurement mode, except AC/DC */
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info->is_resistance = !strncmp(buf, "OH", 2) ||
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(!strncmp(buf, " ", 2) && info->is_ohm);
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info->is_capacity = !strncmp(buf, "CA", 2) ||
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(!strncmp(buf, " ", 2) && info->is_farad);
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info->is_temperature = !strncmp(buf, "TE", 2) ||
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info->is_celsius || info->is_fahrenheit;
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info->is_diode = !strncmp(buf, "DI", 2) ||
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(!strncmp(buf, " ", 2) && info->is_volt && info->is_milli);
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info->is_frequency = !strncmp(buf, "FR", 2) ||
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(!strncmp(buf, " ", 2) && info->is_hertz);
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info->is_gain = !strncmp(buf, "DB", 2) && info->is_decibel;
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info->is_power = (!strncmp(buf, "dB", 2) && info->is_decibel_mw) ||
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((!strncmp(buf, "WT", 2) && info->is_watt));
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info->is_power_factor = !strncmp(buf, "CO", 2) && info->is_unitless;
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info->is_hfe = !strncmp(buf, "HF", 2) ||
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(!strncmp(buf, " ", 2) && !info->is_ampere &&!info->is_volt &&
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!info->is_resistance && !info->is_capacity && !info->is_frequency &&
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!info->is_temperature && !info->is_power && !info->is_power_factor &&
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!info->is_gain && !info->is_logic && !info->is_diode);
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info->is_min = !strncmp(buf, "MN", 2);
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info->is_max = !strncmp(buf, "MX", 2);
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info->is_avg = !strncmp(buf, "AG", 2);
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/*
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* Note:
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* - Protocol doesn't distinguish "resistance" from "beep" mode.
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* - "DB" shows the logarithmic ratio of input voltage to a
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* pre-stored (user-changeable) value in the DMM.
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*/
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/* Byte 13: Always '\r' (carriage return, 0x0d, 13) */
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}
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static void handle_flags(struct sr_datafeed_analog *analog, float *floatval,
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int *exponent, const struct metex14_info *info)
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{
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int factor;
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(void)exponent;
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/* Factors */
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factor = 0;
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if (info->is_pico)
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factor -= 12;
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if (info->is_nano)
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factor -= 9;
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if (info->is_micro)
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factor -= 6;
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if (info->is_milli)
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factor -= 3;
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if (info->is_kilo)
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factor += 3;
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if (info->is_mega)
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factor += 6;
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*floatval *= powf(10, factor);
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/* Measurement modes */
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if (info->is_volt) {
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analog->meaning->mq = SR_MQ_VOLTAGE;
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analog->meaning->unit = SR_UNIT_VOLT;
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}
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if (info->is_ampere) {
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analog->meaning->mq = SR_MQ_CURRENT;
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analog->meaning->unit = SR_UNIT_AMPERE;
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}
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if (info->is_ohm) {
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analog->meaning->mq = SR_MQ_RESISTANCE;
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analog->meaning->unit = SR_UNIT_OHM;
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}
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if (info->is_hertz) {
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analog->meaning->mq = SR_MQ_FREQUENCY;
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analog->meaning->unit = SR_UNIT_HERTZ;
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}
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if (info->is_farad) {
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analog->meaning->mq = SR_MQ_CAPACITANCE;
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analog->meaning->unit = SR_UNIT_FARAD;
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}
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if (info->is_temperature) {
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analog->meaning->mq = SR_MQ_TEMPERATURE;
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if (info->is_celsius)
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analog->meaning->unit = SR_UNIT_CELSIUS;
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else if (info->is_fahrenheit)
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analog->meaning->unit = SR_UNIT_FAHRENHEIT;
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else
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analog->meaning->unit = SR_UNIT_UNITLESS;
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}
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if (info->is_diode) {
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analog->meaning->mq = SR_MQ_VOLTAGE;
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analog->meaning->unit = SR_UNIT_VOLT;
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}
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if (info->is_power) {
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analog->meaning->mq = SR_MQ_POWER;
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if (info->is_decibel_mw)
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analog->meaning->unit = SR_UNIT_DECIBEL_MW;
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else if (info->is_watt)
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analog->meaning->unit = SR_UNIT_WATT;
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else
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analog->meaning->unit = SR_UNIT_UNITLESS;
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}
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if (info->is_power_factor) {
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analog->meaning->mq = SR_MQ_POWER_FACTOR;
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analog->meaning->unit = SR_UNIT_UNITLESS;
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}
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if (info->is_gain) {
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analog->meaning->mq = SR_MQ_GAIN;
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analog->meaning->unit = SR_UNIT_DECIBEL_VOLT;
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}
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if (info->is_hfe) {
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analog->meaning->mq = SR_MQ_GAIN;
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analog->meaning->unit = SR_UNIT_UNITLESS;
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}
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if (info->is_logic) {
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analog->meaning->mq = SR_MQ_GAIN;
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analog->meaning->unit = SR_UNIT_UNITLESS;
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}
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/* Measurement related flags */
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if (info->is_ac)
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analog->meaning->mqflags |= SR_MQFLAG_AC;
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if (info->is_dc)
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analog->meaning->mqflags |= SR_MQFLAG_DC;
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if (info->is_diode)
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analog->meaning->mqflags |= SR_MQFLAG_DIODE | SR_MQFLAG_DC;
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if (info->is_min)
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analog->meaning->mqflags |= SR_MQFLAG_MIN;
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if (info->is_max)
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analog->meaning->mqflags |= SR_MQFLAG_MAX;
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if (info->is_avg)
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analog->meaning->mqflags |= SR_MQFLAG_AVG;
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}
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static gboolean flags_valid(const struct metex14_info *info)
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{
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int count;
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/* Does the packet have more than one multiplier? */
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count = 0;
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count += (info->is_pico) ? 1 : 0;
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count += (info->is_nano) ? 1 : 0;
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count += (info->is_micro) ? 1 : 0;
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count += (info->is_milli) ? 1 : 0;
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count += (info->is_kilo) ? 1 : 0;
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count += (info->is_mega) ? 1 : 0;
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if (count > 1) {
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sr_dbg("More than one multiplier detected in packet.");
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return FALSE;
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}
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/* Does the packet "measure" more than one type of value? */
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count = 0;
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count += (info->is_ac) ? 1 : 0;
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count += (info->is_dc) ? 1 : 0;
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count += (info->is_resistance) ? 1 : 0;
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count += (info->is_capacity) ? 1 : 0;
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count += (info->is_temperature) ? 1 : 0;
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count += (info->is_diode) ? 1 : 0;
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count += (info->is_frequency) ? 1 : 0;
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if (count > 1) {
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sr_dbg("More than one measurement type detected in packet.");
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return FALSE;
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}
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/* Both AC and DC set? */
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if (info->is_ac && info->is_dc) {
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sr_dbg("Both AC and DC flags detected in packet.");
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return FALSE;
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}
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return TRUE;
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}
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#ifdef HAVE_SERIAL_COMM
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SR_PRIV int sr_metex14_packet_request(struct sr_serial_dev_inst *serial)
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{
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const uint8_t wbuf = 'D';
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sr_spew("Requesting DMM packet.");
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return serial_write_blocking(serial, &wbuf, 1, 0);
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}
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#endif
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SR_PRIV gboolean sr_metex14_packet_valid(const uint8_t *buf)
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{
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struct metex14_info info;
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memset(&info, 0x00, sizeof(struct metex14_info));
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parse_flags((const char *)buf, &info);
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if (!flags_valid(&info))
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return FALSE;
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if (buf[13] != '\r')
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return FALSE;
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return TRUE;
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}
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SR_PRIV gboolean sr_metex14_4packets_valid(const uint8_t *buf)
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{
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struct metex14_info info;
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size_t ch_idx;
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const uint8_t *ch_buf;
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ch_buf = buf;
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for (ch_idx = 0; ch_idx < 4; ch_idx++) {
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if (ch_buf[13] != '\r')
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return FALSE;
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memset(&info, 0x00, sizeof(info));
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parse_flags((const char *)ch_buf, &info);
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if (!flags_valid(&info))
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return FALSE;
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ch_buf += METEX14_PACKET_SIZE;
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}
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return TRUE;
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}
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/**
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* Parse a protocol packet.
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*
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* @param buf Buffer containing the protocol packet. Must not be NULL.
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* @param floatval Pointer to a float variable. That variable will be modified
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* in-place depending on the protocol packet. Must not be NULL.
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* @param analog Pointer to a struct sr_datafeed_analog. The struct will be
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* filled with data according to the protocol packet.
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* Must not be NULL.
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* @param info Pointer to a struct metex14_info. The struct will be filled
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* with data according to the protocol packet. Must not be NULL.
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*
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* @return SR_OK upon success, SR_ERR upon failure. Upon errors, the
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* 'analog' variable contents are undefined and should not be used.
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*/
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SR_PRIV int sr_metex14_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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int ret, exponent = 0;
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struct metex14_info *info_local;
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info_local = info;
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/* Don't print byte 13. That one contains the carriage return. */
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sr_dbg("DMM packet: \"%.13s\"", buf);
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memset(info_local, 0x00, sizeof(struct metex14_info));
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if ((ret = parse_value(buf, info_local, floatval, &exponent)) != SR_OK) {
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sr_dbg("Error parsing value: %d.", ret);
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return ret;
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}
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parse_flags((const char *)buf, info_local);
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handle_flags(analog, floatval, &exponent, info_local);
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analog->encoding->digits = -exponent;
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analog->spec->spec_digits = -exponent;
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return SR_OK;
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}
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/**
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* Parse one out of four values of a four-display Metex14 variant.
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*
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* The caller's 'info' parameter can be used to track the channel index,
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* as long as the information is kept across calls to the 14-byte packet
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* parse routine (which clears the 'info' container).
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*
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* Since analog values have further details in the 'analog' parameter,
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* passing multiple values per parse routine call is problematic. So we
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* prefer the approach of passing one value per call, which is most
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* reliable and shall fit every similar device with multiple displays.
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*
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* The meters which use this parse routine send one 14-byte packet per
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* display. Each packet has the regular Metex14 layout.
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*/
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SR_PRIV int sr_metex14_4packets_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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struct metex14_info *info_local;
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size_t ch_idx;
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const uint8_t *ch_buf;
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int rc;
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info_local = info;
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ch_idx = info_local->ch_idx;
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ch_buf = buf + ch_idx * METEX14_PACKET_SIZE;
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rc = sr_metex14_parse(ch_buf, floatval, analog, info);
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info_local->ch_idx = ch_idx + 1;
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return rc;
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}
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