X-Git-Url: https://sigrok.org/gitweb/?p=libsigrok.git;a=blobdiff_plain;f=src%2Fanalog.c;h=4ec724cfde488a0ae4a37a5c2ab0f0b414264da8;hp=29fb8426204c998f0512ca22735a3113f945cb0f;hb=f37f11ec6b3b0bc15de0a186dd9ba424635c117e;hpb=41caa31909882a34b88c8b8a844d555816b78453
diff --git a/src/analog.c b/src/analog.c
index 29fb8426..4ec724cf 100644
--- a/src/analog.c
+++ b/src/analog.c
@@ -17,13 +17,113 @@
* along with this program. If not, see .
*/
+#include
+#include
+#include
#include
-#include "libsigrok.h"
+#include
+#include
+#include
#include "libsigrok-internal.h"
+/** @cond PRIVATE */
#define LOG_PREFIX "analog"
+/** @endcond */
-SR_PRIV int sr_analog_init(struct sr_datafeed_analog2 *analog,
+/**
+ * @file
+ *
+ * Handling and converting analog data.
+ */
+
+/**
+ * @defgroup grp_analog Analog data handling
+ *
+ * Handling and converting analog data.
+ *
+ * @{
+ */
+
+struct unit_mq_string {
+ uint64_t value;
+ const char *str;
+};
+
+/* Please use the same order as in enum sr_unit (libsigrok.h). */
+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_KELVIN, "K" },
+ { SR_UNIT_CELSIUS, "\xc2\xb0""C" },
+ { SR_UNIT_FAHRENHEIT, "\xc2\xb0""F" },
+ { SR_UNIT_HERTZ, "Hz" },
+ { SR_UNIT_PERCENTAGE, "%" },
+ { SR_UNIT_BOOLEAN, "" },
+ { SR_UNIT_SECOND, "s" },
+ { SR_UNIT_SIEMENS, "S" },
+ { SR_UNIT_DECIBEL_MW, "dBm" },
+ { SR_UNIT_DECIBEL_VOLT, "dBV" },
+ { SR_UNIT_UNITLESS, "" },
+ { 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" },
+ { SR_UNIT_HENRY, "H" },
+ { SR_UNIT_GRAM, "g" },
+ { SR_UNIT_CARAT, "ct" },
+ { SR_UNIT_OUNCE, "oz" },
+ { SR_UNIT_TROY_OUNCE, "oz t" },
+ { SR_UNIT_POUND, "lb" },
+ { SR_UNIT_PENNYWEIGHT, "dwt" },
+ { SR_UNIT_GRAIN, "gr" },
+ { SR_UNIT_TAEL, "tael" },
+ { SR_UNIT_MOMME, "momme" },
+ { SR_UNIT_TOLA, "tola" },
+ { SR_UNIT_PIECE, "pcs" },
+ { SR_UNIT_JOULE, "J" },
+ { SR_UNIT_COULOMB, "C" },
+ { SR_UNIT_AMPERE_HOUR, "Ah" },
+ ALL_ZERO
+};
+
+/* Please use the same order as in enum sr_mqflag (libsigrok.h). */
+static struct unit_mq_string mq_strings[] = {
+ { 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_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_DURATION, " DURATION" },
+ { SR_MQFLAG_AVG, " AVG" },
+ { SR_MQFLAG_REFERENCE, " REF" },
+ { SR_MQFLAG_UNSTABLE, " UNSTABLE" },
+ { SR_MQFLAG_FOUR_WIRE, " 4-WIRE" },
+ ALL_ZERO
+};
+
+/** @private */
+SR_PRIV int sr_analog_init(struct sr_datafeed_analog *analog,
struct sr_analog_encoding *encoding,
struct sr_analog_meaning *meaning,
struct sr_analog_spec *spec,
@@ -57,44 +157,500 @@ SR_PRIV int sr_analog_init(struct sr_datafeed_analog2 *analog,
return SR_OK;
}
-SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
- float *buf)
+/**
+ * Convert an analog datafeed payload to an array of floats.
+ *
+ * Sufficient memory for outbuf must have been pre-allocated by the caller,
+ * who is also responsible for freeing it when no longer needed.
+ *
+ * @param[in] analog The analog payload to convert. Must not be NULL.
+ * analog->data, analog->meaning, and analog->encoding
+ * must not be NULL.
+ * @param[out] outbuf Memory where to store the result. Must not be NULL.
+ *
+ * @retval SR_OK Success.
+ * @retval SR_ERR Unsupported encoding.
+ * @retval SR_ERR_ARG Invalid argument.
+ *
+ * @since 0.4.0
+ */
+SR_API int sr_analog_to_float(const struct sr_datafeed_analog *analog,
+ float *outbuf)
{
- float offset;
- unsigned int b, i;
+ unsigned int b, count;
gboolean bigendian;
+ uint8_t conv_buf[sizeof(double)];
+ float *conv_f = (float*)conv_buf;
+ double *conv_d = (double*)conv_buf;
+
+ if (!analog || !(analog->data) || !(analog->meaning)
+ || !(analog->encoding) || !outbuf)
+ return SR_ERR_ARG;
+
+ count = analog->num_samples * g_slist_length(analog->meaning->channels);
#ifdef WORDS_BIGENDIAN
bigendian = TRUE;
#else
bigendian = FALSE;
#endif
+
if (!analog->encoding->is_float) {
- /* TODO */
- sr_err("Only floating-point analog data supported so far.");
- return SR_ERR;
+ float offset = analog->encoding->offset.p / (float)analog->encoding->offset.q;
+ float scale = analog->encoding->scale.p / (float)analog->encoding->scale.q;
+ gboolean is_signed = analog->encoding->is_signed;
+ gboolean is_bigendian = analog->encoding->is_bigendian;
+ int8_t *data8 = (int8_t *)(analog->data);
+ int16_t *data16 = (int16_t *)(analog->data);
+ int32_t *data32 = (int32_t *)(analog->data);
+
+ switch (analog->encoding->unitsize) {
+ case 1:
+ if (is_signed) {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * data8[i];
+ outbuf[i] += offset;
+ }
+ } else {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * R8(data8 + i);
+ outbuf[i] += offset;
+ }
+ }
+ break;
+ case 2:
+ if (is_signed && is_bigendian) {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * RB16S(&data16[i]);
+ outbuf[i] += offset;
+ }
+ } else if (is_bigendian) {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * RB16(&data16[i]);
+ outbuf[i] += offset;
+ }
+ } else if (is_signed) {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * RL16S(&data16[i]);
+ outbuf[i] += offset;
+ }
+ } else {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * RL16(&data16[i]);
+ outbuf[i] += offset;
+ }
+ }
+ break;
+ case 4:
+ if (is_signed && is_bigendian) {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * RB32S(&data32[i]);
+ outbuf[i] += offset;
+ }
+ } else if (is_bigendian) {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * RB32(&data32[i]);
+ outbuf[i] += offset;
+ }
+ } else if (is_signed) {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * RL32S(&data32[i]);
+ outbuf[i] += offset;
+ }
+ } else {
+ for (unsigned int i = 0; i < count; i++) {
+ outbuf[i] = scale * RL32(&data32[i]);
+ outbuf[i] += offset;
+ }
+ }
+ break;
+ default:
+ sr_err("Unsupported unit size '%d' for analog-to-float"
+ " conversion.", analog->encoding->unitsize);
+ return SR_ERR;
+ }
+ return SR_OK;
}
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->scale.p == 1
+ && analog->encoding->scale.q == 1
+ && 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, count * sizeof(float));
} else {
- for (i = 0; i < analog->num_samples; i += analog->encoding->unitsize) {
+ for (unsigned int i = 0; i < count; i++) {
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];
+ conv_buf[b] =
+ ((uint8_t *)analog->data)[i * analog->encoding->unitsize + b];
else
- buf[i + (analog->encoding->unitsize - b)] = ((float *)analog->data)[i * analog->encoding->unitsize + b];
+ conv_buf[analog->encoding->unitsize - b - 1] =
+ ((uint8_t *)analog->data)[i * analog->encoding->unitsize + b];
+ }
+
+ if (analog->encoding->unitsize == sizeof(float)) {
+ if (analog->encoding->scale.p != 1
+ || analog->encoding->scale.q != 1)
+ *conv_f = (*conv_f * analog->encoding->scale.p) / analog->encoding->scale.q;
+ float offset = ((float)analog->encoding->offset.p / (float)analog->encoding->offset.q);
+ *conv_f += offset;
+
+ outbuf[i] = *conv_f;
+ }
+ else if (analog->encoding->unitsize == sizeof(double)) {
+ if (analog->encoding->scale.p != 1
+ || analog->encoding->scale.q != 1)
+ *conv_d = (*conv_d * analog->encoding->scale.p) / analog->encoding->scale.q;
+ double offset = ((double)analog->encoding->offset.p / (double)analog->encoding->offset.q);
+ *conv_d += offset;
+
+ outbuf[i] = *conv_d;
}
- 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;
+ else {
+ sr_err("Unsupported floating-point unit size '%d' for analog-to-float"
+ " conversion.", analog->encoding->unitsize);
+ return SR_ERR;
+ }
+ }
+ }
+
+ return SR_OK;
+}
+
+/**
+ * Scale a float value to the appropriate SI prefix.
+ *
+ * @param[in,out] value The float value to convert to appropriate SI prefix.
+ * @param[in,out] digits The number of significant decimal digits in value.
+ *
+ * @return The SI prefix to which value was scaled, as a printable string.
+ *
+ * @since 0.5.0
+ */
+SR_API const char *sr_analog_si_prefix(float *value, int *digits)
+{
+/** @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", "µ", "m", "", "k", "M", "G", "T" };
+
+ if (!value || !digits || isnan(*value))
+ return prefixes[NEG_PREFIX_COUNT];
+
+ float logval = log10f(fabsf(*value));
+ int prefix = (logval / 3) - (logval < 1);
+
+ if (prefix < -NEG_PREFIX_COUNT)
+ prefix = -NEG_PREFIX_COUNT;
+ if (3 * prefix < -*digits)
+ prefix = (-*digits + 2 * (*digits < 0)) / 3;
+ if (prefix > POS_PREFIX_COUNT)
+ prefix = POS_PREFIX_COUNT;
+
+ *value *= powf(10, -3 * prefix);
+ *digits += 3 * prefix;
+
+ 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.
+ *
+ * The string is allocated by the function and must be freed by the caller
+ * after use by calling g_free().
+ *
+ * @param[in] analog Struct containing the unit, MQ and MQ flags.
+ * Must not be NULL. analog->meaning must not be NULL.
+ * @param[out] result Pointer to store result. Must not be NULL.
+ *
+ * @retval SR_OK Success.
+ * @retval SR_ERR_ARG Invalid argument.
+ *
+ * @since 0.4.0
+ */
+SR_API int sr_analog_unit_to_string(const struct sr_datafeed_analog *analog,
+ char **result)
+{
+ int i;
+ GString *buf;
+
+ if (!analog || !(analog->meaning) || !result)
+ return SR_ERR_ARG;
+
+ 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;
+}
+
+/**
+ * Set sr_rational r to the given value.
+ *
+ * @param[out] r Rational number struct to set. Must not be NULL.
+ * @param[in] p Numerator.
+ * @param[in] q Denominator.
+ *
+ * @since 0.4.0
+ */
+SR_API void sr_rational_set(struct sr_rational *r, int64_t p, uint64_t q)
+{
+ if (!r)
+ return;
+
+ r->p = p;
+ r->q = q;
+}
+
+#ifndef HAVE___INT128_T
+struct sr_int128_t {
+ int64_t high;
+ uint64_t low;
+};
+
+struct sr_uint128_t {
+ uint64_t high;
+ uint64_t low;
+};
+
+static void mult_int64(struct sr_int128_t *res, const int64_t a,
+ const int64_t b)
+{
+ uint64_t t1, t2, t3, t4;
+
+ t1 = (UINT32_MAX & a) * (UINT32_MAX & b);
+ t2 = (UINT32_MAX & a) * (b >> 32);
+ t3 = (a >> 32) * (UINT32_MAX & b);
+ t4 = (a >> 32) * (b >> 32);
+
+ res->low = t1 + (t2 << 32) + (t3 << 32);
+ res->high = (t1 >> 32) + (uint64_t)((uint32_t)(t2)) + (uint64_t)((uint32_t)(t3));
+ res->high >>= 32;
+ res->high += ((int64_t)t2 >> 32) + ((int64_t)t3 >> 32) + t4;
+}
+
+static void mult_uint64(struct sr_uint128_t *res, const uint64_t a,
+ const uint64_t b)
+{
+ uint64_t t1, t2, t3, t4;
+
+ // (x1 + x2) * (y1 + y2) = x1*y1 + x1*y2 + x2*y1 + x2*y2
+ t1 = (UINT32_MAX & a) * (UINT32_MAX & b);
+ t2 = (UINT32_MAX & a) * (b >> 32);
+ t3 = (a >> 32) * (UINT32_MAX & b);
+ t4 = (a >> 32) * (b >> 32);
+
+ res->low = t1 + (t2 << 32) + (t3 << 32);
+ res->high = (t1 >> 32) + (uint64_t)((uint32_t)(t2)) + (uint64_t)((uint32_t)(t3));
+ res->high >>= 32;
+ res->high += ((int64_t)t2 >> 32) + ((int64_t)t3 >> 32) + t4;
+}
+#endif
+
+/**
+ * Compare two sr_rational for equality.
+ *
+ * The values are compared for numerical equality, i.e. 2/10 == 1/5.
+ *
+ * @param[in] a First value.
+ * @param[in] b Second value.
+ *
+ * @retval 1 if both values are equal.
+ * @retval 0 Otherwise.
+ *
+ * @since 0.5.0
+ */
+SR_API int sr_rational_eq(const struct sr_rational *a, const struct sr_rational *b)
+{
+#ifdef HAVE___INT128_T
+ __int128_t m1, m2;
+
+ /* p1/q1 = p2/q2 <=> p1*q2 = p2*q1 */
+ m1 = ((__int128_t)(b->p)) * ((__uint128_t)a->q);
+ m2 = ((__int128_t)(a->p)) * ((__uint128_t)b->q);
+
+ return (m1 == m2);
+
+#else
+ struct sr_int128_t m1, m2;
+
+ mult_int64(&m1, a->q, b->p);
+ mult_int64(&m2, a->p, b->q);
+
+ return (m1.high == m2.high) && (m1.low == m2.low);
+#endif
+}
+
+/**
+ * Multiply two sr_rational.
+ *
+ * The resulting nominator/denominator are reduced if the result would not fit
+ * otherwise. If the resulting nominator/denominator are relatively prime,
+ * this may not be possible.
+ *
+ * It is safe to use the same variable for result and input values.
+ *
+ * @param[in] a First value.
+ * @param[in] b Second value.
+ * @param[out] res Result.
+ *
+ * @retval SR_OK Success.
+ * @retval SR_ERR_ARG Resulting value too large.
+ *
+ * @since 0.5.0
+ */
+SR_API int sr_rational_mult(struct sr_rational *res, const struct sr_rational *a,
+ const struct sr_rational *b)
+{
+#ifdef HAVE___INT128_T
+ __int128_t p;
+ __uint128_t q;
+
+ p = (__int128_t)(a->p) * (__int128_t)(b->p);
+ q = (__uint128_t)(a->q) * (__uint128_t)(b->q);
+
+ if ((p > INT64_MAX) || (p < INT64_MIN) || (q > UINT64_MAX)) {
+ while (!((p & 1) || (q & 1))) {
+ p /= 2;
+ q /= 2;
}
}
+ if ((p > INT64_MAX) || (p < INT64_MIN) || (q > UINT64_MAX)) {
+ // TODO: determine gcd to do further reduction
+ return SR_ERR_ARG;
+ }
+
+ res->p = (int64_t)p;
+ res->q = (uint64_t)q;
+
+ return SR_OK;
+
+#else
+ struct sr_int128_t p;
+ struct sr_uint128_t q;
+
+ mult_int64(&p, a->p, b->p);
+ mult_uint64(&q, a->q, b->q);
+
+ while (!(p.low & 1) && !(q.low & 1)) {
+ p.low /= 2;
+ if (p.high & 1)
+ p.low |= (1ll << 63);
+ p.high >>= 1;
+ q.low /= 2;
+ if (q.high & 1)
+ q.low |= (1ll << 63);
+ q.high >>= 1;
+ }
+
+ if (q.high)
+ return SR_ERR_ARG;
+ if ((p.high >= 0) && (p.low > INT64_MAX))
+ return SR_ERR_ARG;
+ if (p.high < -1)
+ return SR_ERR_ARG;
+
+ res->p = (int64_t)p.low;
+ res->q = q.low;
+
return SR_OK;
+#endif
+}
+
+/**
+ * Divide rational a by rational b.
+ *
+ * The resulting nominator/denominator are reduced if the result would not fit
+ * otherwise. If the resulting nominator/denominator are relatively prime,
+ * this may not be possible.
+ *
+ * It is safe to use the same variable for result and input values.
+ *
+ * @param[in] num Numerator.
+ * @param[in] div Divisor.
+ * @param[out] res Result.
+ *
+ * @retval SR_OK Success.
+ * @retval SR_ERR_ARG Division by zero, denominator of divisor too large,
+ * or resulting value too large.
+ *
+ * @since 0.5.0
+ */
+SR_API int sr_rational_div(struct sr_rational *res, const struct sr_rational *num,
+ const struct sr_rational *div)
+{
+ struct sr_rational t;
+
+ if (div->q > INT64_MAX)
+ return SR_ERR_ARG;
+ if (div->p == 0)
+ return SR_ERR_ARG;
+
+ if (div->p > 0) {
+ t.p = div->q;
+ t.q = div->p;
+ } else {
+ t.p = -div->q;
+ t.q = -div->p;
+ }
+
+ return sr_rational_mult(res, num, &t);
}
+
+/** @} */