/*
- * This file is part of the sigrok project.
+ * This file is part of the libsigrok project.
*
- * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2012-2013 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
#include "libsigrok.h"
#include "libsigrok-internal.h"
-/* Message logging helpers with driver-specific prefix string. */
-#define DRIVER_LOG_DOMAIN "metex14: "
-#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
-#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
-#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
-#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
-#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
-#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
+/* Message logging helpers with subsystem-specific prefix string. */
+#define LOG_PREFIX "metex14: "
+#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
+#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
+#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
+#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
+#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
+#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
static int parse_value(const uint8_t *buf, float *result)
{
- int i, sign, intval = 0, factor, decimal_point = 0, is_ol;
- float floatval;
- uint8_t digit;
-
- /* Byte 3: Sign (' ' or '-') */
- if (buf[3] == ' ') {
- sign = 1;
- } else if (buf[3] == '-') {
- sign = -1;
- } else {
- sr_err("Invalid sign byte: 0x%02x.", buf[3]);
- return SR_ERR;
+ int i, is_ol, cnt;
+ char valstr[7 + 1];
+
+ /* Strip all spaces from bytes 2-8. */
+ memset(&valstr, 0, 7 + 1);
+ for (i = 0, cnt = 0; i < 7; i++) {
+ if (buf[2 + i] != ' ')
+ valstr[cnt++] = buf[2 + i];
}
/* Bytes 5-7: Over limit (various forms) */
is_ol = 0;
- is_ol += (!strncmp((char *)&buf[5], ".OL", 3)) ? 1 : 0;
- is_ol += (!strncmp((char *)&buf[5], "O.L", 3)) ? 1 : 0;
- is_ol += (!strncmp((char *)&buf[5], "OL.", 3)) ? 1 : 0;
- is_ol += (!strncmp((char *)&buf[5], " OL", 3)) ? 1 : 0;
+ is_ol += (!strcasecmp((const char *)&valstr, ".OL")) ? 1 : 0;
+ is_ol += (!strcasecmp((const char *)&valstr, "O.L")) ? 1 : 0;
+ is_ol += (!strcasecmp((const char *)&valstr, "OL.")) ? 1 : 0;
+ is_ol += (!strcasecmp((const char *)&valstr, "OL")) ? 1 : 0;
+ is_ol += (!strcasecmp((const char *)&valstr, "-.OL")) ? 1 : 0;
+ is_ol += (!strcasecmp((const char *)&valstr, "-O.L")) ? 1 : 0;
+ is_ol += (!strcasecmp((const char *)&valstr, "-OL.")) ? 1 : 0;
+ is_ol += (!strcasecmp((const char *)&valstr, "-OL")) ? 1 : 0;
if (is_ol != 0) {
sr_spew("Over limit.");
*result = INFINITY;
return SR_OK;
}
- /* Bytes 4-8: Value (up to 4 digits) and decimal point */
- factor = 1000;
- for (i = 0; i < 5; i++) {
- digit = buf[4 + i];
- /* Convert spaces to '0', so that we can parse them. */
- if (digit == ' ')
- digit = '0';
- if (digit == '.') {
- decimal_point = i;
- } else if (isdigit(digit)) {
- intval += (digit - '0') * factor;
- factor /= 10;
- } else {
- sr_err("Invalid digit byte: 0x%02x.", digit);
- return SR_ERR;
- }
- }
-
- floatval = (float)intval;
-
- /* Decimal point position */
- if (decimal_point == 0 || decimal_point == 4) {
- /* TODO: Doesn't happen? */
- } else if (decimal_point == 1) {
- floatval /= 1000;
- } else if (decimal_point == 2) {
- floatval /= 100;
- } else if (decimal_point == 3) {
- floatval /= 10;
- } else {
- sr_err("Invalid decimal point position: %d.", decimal_point);
- return SR_ERR;
- }
-
- /* Apply sign. */
- floatval *= sign;
-
- sr_spew("The display value is %f.", floatval);
+ /* Bytes 2-8: Sign, value (up to 5 digits) and decimal point */
+ sscanf((const char *)&valstr, "%f", result);
- *result = floatval;
+ sr_spew("The display value is %f.", *result);
return SR_OK;
}
static void parse_flags(const char *buf, struct metex14_info *info)
{
+ int i, cnt;
+ char unit[4 + 1];
+ const char *u;
+
/* Bytes 0-1: Measurement mode */
/* Note: Protocol doesn't distinguish "resistance" from "beep" mode. */
info->is_ac = !strncmp(buf, "AC", 2);
info->is_temperature = !strncmp(buf, "TE", 2);
info->is_diode = !strncmp(buf, "DI", 2);
info->is_frequency = !strncmp(buf, "FR", 2);
+ info->is_gain = !strncmp(buf, "DB", 2);
+ info->is_hfe = !strncmp(buf, "HF", 2);
+
+ /*
+ * Note: "DB" shows the logarithmic ratio of input voltage to a
+ * pre-stored (user-changeable) value in the DMM.
+ */
if (info->is_dc || info->is_ac)
info->is_volt = TRUE;
- /* Byte 2: Always space (0x20). */
+ /* Bytes 2-8: See parse_value(). */
- /* Bytes 3-8: See parse_value(). */
+ /* Strip all spaces from bytes 9-12. */
+ memset(&unit, 0, 4 + 1);
+ for (i = 0, cnt = 0; i < 4; i++) {
+ if (buf[9 + i] != ' ')
+ unit[cnt++] = buf[9 + i];
+ }
/* Bytes 9-12: Unit */
- if (!strncmp(buf + 9, " A", 4))
+ u = (const char *)&unit;
+ if (!strcasecmp(u, "A"))
info->is_ampere = TRUE;
- else if (!strncmp(buf + 9, " mA", 4))
+ else if (!strcasecmp(u, "mA"))
info->is_milli = info->is_ampere = TRUE;
- else if (!strncmp(buf + 9, " uA", 4))
+ else if (!strcasecmp(u, "uA"))
info->is_micro = info->is_ampere = TRUE;
- else if (!strncmp(buf + 9, " V", 4))
+ else if (!strcasecmp(u, "V"))
info->is_volt = TRUE;
- else if (!strncmp(buf + 9, " mV", 4))
+ else if (!strcasecmp(u, "mV"))
info->is_milli = info->is_volt = TRUE;
- else if (!strncmp(buf + 9, " Ohm", 4))
+ else if (!strcasecmp(u, "Ohm"))
info->is_ohm = TRUE;
- else if (!strncmp(buf + 9, "KOhm", 4))
+ else if (!strcasecmp(u, "KOhm"))
info->is_kilo = info->is_ohm = TRUE;
- else if (!strncmp(buf + 9, "MOhm", 4))
+ else if (!strcasecmp(u, "MOhm"))
info->is_mega = info->is_ohm = TRUE;
- else if (!strncmp(buf + 9, " nF", 4))
+ else if (!strcasecmp(u, "pF"))
+ info->is_pico = info->is_farad = TRUE;
+ else if (!strcasecmp(u, "nF"))
info->is_nano = info->is_farad = TRUE;
- else if (!strncmp(buf + 9, " uF", 4))
+ else if (!strcasecmp(u, "uF"))
info->is_micro = info->is_farad = TRUE;
- else if (!strncmp(buf + 9, " KHz", 4))
+ else if (!strcasecmp(u, "KHz"))
info->is_kilo = info->is_hertz = TRUE;
- else if (!strncmp(buf + 9, " C", 4))
+ else if (!strcasecmp(u, "C"))
info->is_celsius = TRUE;
+ else if (!strcasecmp(u, "DB"))
+ info->is_decibel = TRUE;
+ else if (!strcasecmp(u, ""))
+ info->is_unitless = TRUE;
/* Byte 13: Always '\r' (carriage return, 0x0d, 13) */
}
const struct metex14_info *info)
{
/* Factors */
+ if (info->is_pico)
+ *floatval /= 1000000000000ULL;
if (info->is_nano)
*floatval /= 1000000000;
if (info->is_micro)
analog->mq = SR_MQ_VOLTAGE;
analog->unit = SR_UNIT_VOLT;
}
+ if (info->is_gain) {
+ analog->mq = SR_MQ_GAIN;
+ analog->unit = SR_UNIT_DECIBEL_VOLT;
+ }
+ if (info->is_hfe) {
+ analog->mq = SR_MQ_GAIN;
+ analog->unit = SR_UNIT_UNITLESS;
+ }
/* Measurement related flags */
if (info->is_ac)
analog->mqflags |= SR_MQFLAG_AC;
if (info->is_dc)
analog->mqflags |= SR_MQFLAG_DC;
+ if (info->is_diode)
+ analog->mqflags |= SR_MQFLAG_DIODE;
}
static gboolean flags_valid(const struct metex14_info *info)
/* Does the packet have more than one multiplier? */
count = 0;
+ count += (info->is_pico) ? 1 : 0;
count += (info->is_nano) ? 1 : 0;
count += (info->is_micro) ? 1 : 0;
count += (info->is_milli) ? 1 : 0;
return TRUE;
}
+#ifdef HAVE_LIBSERIALPORT
SR_PRIV int sr_metex14_packet_request(struct sr_serial_dev_inst *serial)
{
const uint8_t wbuf = 'D';
return (serial_write(serial, &wbuf, 1) == 1) ? SR_OK : SR_ERR;
}
+#endif
SR_PRIV gboolean sr_metex14_packet_valid(const uint8_t *buf)
{
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