* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <stdio.h>
+#include <stdint.h>
#include <string.h>
+#include <ctype.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#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,
+ struct sr_analog_spec *spec,
+ int digits)
+{
+ memset(analog, 0, sizeof(*analog));
+ memset(encoding, 0, sizeof(*encoding));
+ memset(meaning, 0, sizeof(*meaning));
+ memset(spec, 0, sizeof(*spec));
+
+ analog->encoding = encoding;
+ analog->meaning = meaning;
+ analog->spec = spec;
+
+ encoding->unitsize = sizeof(float);
+ encoding->is_float = TRUE;
+#ifdef WORDS_BIGENDIAN
+ encoding->is_bigendian = TRUE;
+#else
+ encoding->is_bigendian = FALSE;
+#endif
+ encoding->digits = digits;
+ encoding->is_digits_decimal = TRUE;
+ encoding->scale.p = 1;
+ encoding->scale.q = 1;
+ encoding->offset.p = 0;
+ encoding->offset.q = 1;
+
+ spec->spec_digits = digits;
+
+ return SR_OK;
+}
+
SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
- float *buf)
+ float *outbuf)
{
float offset;
unsigned int b, i;
#endif
if (!analog->encoding->is_float) {
/* TODO */
- sr_err("Only floating-point analog data supported so far.");
+ sr_err("Only floating-point encoding supported so far.");
return SR_ERR;
}
if (analog->encoding->unitsize == sizeof(float)
&& analog->encoding->is_bigendian == bigendian
&& (analog->encoding->scale.p == analog->encoding->scale.q)
- && analog->encoding->scale.p / (float)analog->encoding->scale.q == 0) {
+ && analog->encoding->offset.p / (float)analog->encoding->offset.q == 0) {
/* The data is already in the right format. */
- memcpy(buf, analog->data, analog->num_samples * sizeof(float));
+ memcpy(outbuf, analog->data, analog->num_samples * sizeof(float));
} else {
for (i = 0; i < analog->num_samples; i += analog->encoding->unitsize) {
for (b = 0; b < analog->encoding->unitsize; b++) {
if (analog->encoding->is_bigendian == bigendian)
- buf[i + b] = ((float *)analog->data)[i * analog->encoding->unitsize + b];
+ outbuf[i + b] = ((float *)analog->data)[i * analog->encoding->unitsize + b];
else
- buf[i + (analog->encoding->unitsize - b)] = ((float *)analog->data)[i * analog->encoding->unitsize + b];
+ outbuf[i + (analog->encoding->unitsize - b)] = ((float *)analog->data)[i * analog->encoding->unitsize + b];
}
if (analog->encoding->scale.p != analog->encoding->scale.q)
- buf[i] = (buf[i] * analog->encoding->scale.p) / analog->encoding->scale.q;
- offset = ((float)analog->encoding->scale.p / (float)analog->encoding->scale.q);
- buf[i] += offset;
+ outbuf[i] = (outbuf[i] * analog->encoding->scale.p) / analog->encoding->scale.q;
+ offset = ((float)analog->encoding->offset.p / (float)analog->encoding->offset.q);
+ outbuf[i] += offset;
}
}
return SR_OK;
}
+
+/*
+ * Convert a floating point value to a string, limited to the given
+ * number of decimal digits.
+ *
+ * @param value The value to convert.
+ * @param digits Number of digits after the decimal point to print.
+ * @param result Pointer to store result.
+ *
+ * The string is allocated by the function and must be freed by the caller
+ * after use by calling g_free().
+ *
+ * @retval SR_OK
+ *
+ * @since 0.4.0
+ */
+SR_API int sr_analog_float_to_string(float value, int digits, char **result)
+{
+ int cnt, i;
+
+ /* This produces at least one too many digits */
+ *result = g_strdup_printf("%.*f", digits, value);
+ for (i = 0, cnt = 0; (*result)[i]; i++) {
+ if (isdigit((*result)[i++]))
+ cnt++;
+ if (cnt == digits) {
+ (*result)[i] = 0;
+ break;
+ }
+ }
+
+ 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 result Pointer to store result.
+ *
+ * The string is allocated by the function and must be freed by the caller
+ * after use by calling g_free().
+ *
+ * @retval SR_OK
+ *
+ * @since 0.4.0
+ */
+SR_API int sr_analog_unit_to_string(const struct sr_datafeed_analog2 *analog,
+ char **result)
+{
+ int i;
+ GString *buf = g_string_new(NULL);
+
+ for (i = 0; unit_strings[i].value; i++) {
+ if (analog->meaning->unit == unit_strings[i].value) {
+ g_string_assign(buf, unit_strings[i].str);
+ break;
+ }
+ }
+
+ /* More than one MQ flag may apply. */
+ for (i = 0; mq_strings[i].value; i++)
+ if (analog->meaning->mqflags & mq_strings[i].value)
+ g_string_append(buf, mq_strings[i].str);
+
+ *result = buf->str;
+ g_string_free(buf, FALSE);
+
+ return SR_OK;
+}
+
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