ALL_ZERO
};
+/** @private */
SR_PRIV int sr_analog_init(struct sr_datafeed_analog *analog,
struct sr_analog_encoding *encoding,
struct sr_analog_meaning *meaning,
*/
SR_API const char *sr_analog_si_prefix(float *value, int *digits)
{
-#define NEG_PREFIX_COUNT 5 /* number of prefixes below unity */
+/** @cond PRIVATE */
+#define NEG_PREFIX_COUNT 5 /* number of prefixes below unity */
#define POS_PREFIX_COUNT (int)(ARRAY_SIZE(prefixes) - NEG_PREFIX_COUNT - 1)
+/** @endcond */
static const char *prefixes[] = { "f", "p", "n", "ยต", "m", "", "k", "M", "G", "T" };
if (!value || !digits || isnan(*value))
return prefixes[prefix + NEG_PREFIX_COUNT];
}
+/**
+ * Check if a unit "accepts" an SI prefix.
+ *
+ * E.g. SR_UNIT_VOLT is SI prefix friendly while SR_UNIT_DECIBEL_MW or
+ * SR_UNIT_PERCENTAGE are not.
+ *
+ * @param[in] unit The unit to check for SI prefix "friendliness".
+ *
+ * @return TRUE if the unit "accept" an SI prefix.
+ *
+ * @since 0.5.0
+ */
+SR_API gboolean sr_analog_si_prefix_friendly(enum sr_unit unit)
+{
+ static const enum sr_unit prefix_friendly_units[] = {
+ SR_UNIT_VOLT,
+ SR_UNIT_AMPERE,
+ SR_UNIT_OHM,
+ SR_UNIT_FARAD,
+ SR_UNIT_KELVIN,
+ SR_UNIT_HERTZ,
+ SR_UNIT_SECOND,
+ SR_UNIT_SIEMENS,
+ SR_UNIT_VOLT_AMPERE,
+ SR_UNIT_WATT,
+ SR_UNIT_WATT_HOUR,
+ SR_UNIT_METER_SECOND,
+ SR_UNIT_HENRY,
+ SR_UNIT_GRAM
+ };
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(prefix_friendly_units); i++)
+ if (unit == prefix_friendly_units[i])
+ break;
+
+ if (unit != prefix_friendly_units[i])
+ return FALSE;
+
+ return TRUE;
+}
+
/**
* Convert the unit/MQ/MQ flags in the analog struct to a string.
*
return SR_ERR_ARG;
}
- res->p = (int64_t)(p);
- res->q = (uint64_t)(q);
+ res->p = (int64_t)p;
+ res->q = (uint64_t)q;
return SR_OK;