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 int sr_analog_to_float(const struct sr_datafeed_analog *analog,
float *outbuf)
{
- float offset;
- unsigned int b, i, count;
+ unsigned int b, count;
gboolean bigendian;
if (!analog || !(analog->data) || !(analog->meaning)
/* The data is already in the right format. */
memcpy(outbuf, analog->data, count * sizeof(float));
} else {
- for (i = 0; i < count; i += analog->encoding->unitsize) {
+ for (unsigned int i = 0; i < count; i += analog->encoding->unitsize) {
for (b = 0; b < analog->encoding->unitsize; b++) {
if (analog->encoding->is_bigendian == bigendian)
((uint8_t *)outbuf)[i + b] =
if (analog->encoding->scale.p != 1
|| analog->encoding->scale.q != 1)
outbuf[i] = (outbuf[i] * analog->encoding->scale.p) / analog->encoding->scale.q;
- offset = ((float)analog->encoding->offset.p / (float)analog->encoding->offset.q);
+ float offset = ((float)analog->encoding->offset.p / (float)analog->encoding->offset.q);
outbuf[i] += offset;
}
}
*/
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])
+ return TRUE;
+
+ return FALSE;
+}
+
/**
* 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;