Analog data handling

Handling and converting analog data. More...

Functions
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, int digits)
int	sr_analog_to_float (const struct sr_datafeed_analog *analog, float *outbuf)
	Convert an analog datafeed payload to an array of floats. More...
int	sr_analog_unit_to_string (const struct sr_datafeed_analog *analog, char **result)
	Convert the unit/MQ/MQ flags in the analog struct to a string. More...
void	sr_rational_set (struct sr_rational *r, int64_t p, uint64_t q)
	Set sr_rational r to the given value. More...

Detailed Description

Handling and converting analog data.

Function Documentation

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,
		int	digits
	)

Definition at line 120 of file analog.c.

References sr_analog_encoding::digits, sr_datafeed_analog::encoding, sr_analog_encoding::is_bigendian, sr_analog_encoding::is_digits_decimal, sr_analog_encoding::is_float, sr_datafeed_analog::meaning, sr_analog_encoding::offset, sr_rational::p, sr_rational::q, sr_analog_encoding::scale, sr_datafeed_analog::spec, sr_analog_spec::spec_digits, SR_OK, and sr_analog_encoding::unitsize.

int sr_analog_to_float	(	const struct sr_datafeed_analog *	analog,
		float *	outbuf
	)

Convert an analog datafeed payload to an array of floats.

Parameters

[in]	analog	The analog payload to convert. Must not be NULL. analog->data, analog->meaning, and analog->encoding must not be NULL.
[out]	outbuf	Memory where to store the result. Must not be NULL.

Sufficient memory for outbuf must have been pre-allocated by the caller, who is also responsible for freeing it when no longer needed.

Return values

SR_OK	Success.
SR_ERR	Unsupported encoding.
SR_ERR_ARG	Invalid argument.

Since

0.4.0

Definition at line 171 of file analog.c.

References sr_analog_meaning::channels, sr_datafeed_analog::data, sr_datafeed_analog::encoding, sr_analog_encoding::is_bigendian, sr_analog_encoding::is_float, sr_analog_encoding::is_signed, sr_datafeed_analog::meaning, sr_datafeed_analog::num_samples, sr_analog_encoding::offset, sr_rational::p, sr_rational::q, sr_analog_encoding::scale, SR_ERR, SR_ERR_ARG, SR_OK, and sr_analog_encoding::unitsize.

int sr_analog_unit_to_string	(	const struct sr_datafeed_analog *	analog,
		char **	result
	)

Convert the unit/MQ/MQ flags in the analog struct to a string.

Parameters

[in]	analog	Struct containing the unit, MQ and MQ flags. Must not be NULL. analog->meaning must not be NULL.
[out]	result	Pointer to store result. Must not be NULL.

The string is allocated by the function and must be freed by the caller after use by calling g_free().

Return values

SR_OK	Success.
SR_ERR_ARG	Invalid argument.

Since

0.4.0

Definition at line 309 of file analog.c.

References sr_datafeed_analog::meaning, sr_analog_meaning::mqflags, SR_ERR_ARG, SR_OK, and sr_analog_meaning::unit.

void sr_rational_set	(	struct sr_rational *	r,
		int64_t	p,
		uint64_t	q
	)

Set sr_rational r to the given value.

Parameters

[out]	r	Rational number struct to set. Must not be NULL.
[in]	p	Numerator.
[in]	q	Denominator.

Since

0.4.0

Definition at line 347 of file analog.c.

References sr_rational::p, and sr_rational::q.