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Add analog helper sr_analog_unit_to_string().

This commit is contained in:
Bert Vermeulen 2014-11-18 01:16:27 +01:00
parent c2a25ebb8f
commit a5892391b0
2 changed files with 94 additions and 0 deletions
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2
include/libsigrok/proto.h
View File

@ -32,6 +32,8 @@ SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
float *buf);
SR_API int sr_analog_float_to_string(float value, int digits, char *outbuf,
int bufsize);
SR_API int sr_analog_unit_to_string(const struct sr_datafeed_analog2 *analog,
char *outbuf, int bufsize);
/*--- backend.c -------------------------------------------------------------*/

92
src/analog.c
View File

@ -26,6 +26,63 @@
#define LOG_PREFIX "analog"
struct unit_mq_string {
uint64_t value;
char *str;
};
static struct unit_mq_string unit_strings[] = {
{ SR_UNIT_VOLT, "V" },
{ SR_UNIT_AMPERE, "A" },
{ SR_UNIT_OHM, "\xe2\x84\xa6" },
{ SR_UNIT_FARAD, "F" },
{ SR_UNIT_HENRY, "H" },
{ SR_UNIT_KELVIN, "K" },
{ SR_UNIT_CELSIUS, "\xc2\xb0""C" },
{ SR_UNIT_FAHRENHEIT, "\xc2\xb0""F" },
{ SR_UNIT_HERTZ, "Hz" },
{ SR_UNIT_PERCENTAGE, "%" },
{ SR_UNIT_SECOND, "s" },
{ SR_UNIT_SIEMENS, "S" },
{ SR_UNIT_DECIBEL_MW, "dBu" },
{ SR_UNIT_DECIBEL_VOLT, "dBv" },
{ SR_UNIT_DECIBEL_SPL, "dB" },
{ SR_UNIT_CONCENTRATION, "ppm" },
{ SR_UNIT_REVOLUTIONS_PER_MINUTE, "RPM" },
{ SR_UNIT_VOLT_AMPERE, "VA" },
{ SR_UNIT_WATT, "W" },
{ SR_UNIT_WATT_HOUR, "Wh" },
{ SR_UNIT_METER_SECOND, "m/s" },
{ SR_UNIT_HECTOPASCAL, "hPa" },
{ SR_UNIT_HUMIDITY_293K, "%rF" },
{ SR_UNIT_DEGREE, "\xc2\xb0" },
ALL_ZERO
};
static struct unit_mq_string mq_strings[] = {
{ SR_MQFLAG_SPL_FREQ_WEIGHT_A, "(A)" },
{ SR_MQFLAG_SPL_FREQ_WEIGHT_C, "(C)" },
{ SR_MQFLAG_SPL_FREQ_WEIGHT_Z, "(Z)" },
{ SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT, "(SPL)" },
{ SR_MQFLAG_SPL_TIME_WEIGHT_S, " S" },
{ SR_MQFLAG_SPL_TIME_WEIGHT_F, " F" },
{ SR_MQFLAG_SPL_LAT, " LAT" },
/* Not a standard function for SLMs, so this is a made-up notation. */
{ SR_MQFLAG_SPL_PCT_OVER_ALARM, "%oA" },
{ SR_MQFLAG_AC, " AC" },
{ SR_MQFLAG_DC, " DC" },
{ SR_MQFLAG_RMS, " RMS" },
{ SR_MQFLAG_DIODE, " DIODE" },
{ SR_MQFLAG_HOLD, " HOLD" },
{ SR_MQFLAG_MAX, " MAX" },
{ SR_MQFLAG_MIN, " MIN" },
{ SR_MQFLAG_AUTORANGE, " AUTO" },
{ SR_MQFLAG_RELATIVE, " REL" },
{ SR_MQFLAG_AVG, " AVG" },
{ SR_MQFLAG_REFERENCE, " REF" },
ALL_ZERO
};
SR_PRIV int sr_analog_init(struct sr_datafeed_analog2 *analog,
struct sr_analog_encoding *encoding,
struct sr_analog_meaning *meaning,
@ -134,3 +191,38 @@ SR_API int sr_analog_float_to_string(float value, int digits, char *outbuf,
return SR_OK;
}
/*
* Convert the unit/MQ/MQ flags in the analog struct to a string.
*
* @param analog Struct containing the unit, MQ and MQ flags.
* @param outbuf Buffer in which the resulting string will be placed.
* @param bufsize Size of the buffer in bytes.
*
* @retval SR_OK
*
* @since 0.4.0
*/
SR_API int sr_analog_unit_to_string(const struct sr_datafeed_analog2 *analog,
char *outbuf, int bufsize)
{
int len, i;
outbuf[0] = 0;
for (i = 0; unit_strings[i].value; i++) {
if (analog->meaning->unit == unit_strings[i].value) {
strncpy(outbuf, unit_strings[i].str, bufsize);
break;
}
}
/* More than one MQ flag may apply. */
for (i = 0; mq_strings[i].value; i++) {
if (analog->meaning->mqflags & mq_strings[i].value) {
len = strlen(outbuf);
strncat(outbuf + len, mq_strings[i].str, bufsize - len);
}
}
return SR_OK;
}