#include <stdlib.h>
#include "ad4170.h"

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Macros
#define	AD4170_PGA_GAIN(x) (1 << (x))

Functions
int32_t	ad4170_read_single_sample (uint8_t input_chn, uint32_t *raw_data)
	Read the single ADC sample (raw data) for input channel.

int32_t	ad4170_read_converted_sample (uint32_t *adc_data)
	Read ADC raw data for recently sampled channel.

int32_t	perform_sign_conversion (uint32_t adc_raw_data, uint8_t chn)
	Perform the sign conversion for handling negative voltages in bipolar mode.

float	convert_adc_sample_into_voltage (uint32_t adc_raw, uint8_t chn)
	Convert the ADC raw value into equivalent voltage.

float	convert_adc_data_to_voltage_without_vref (int32_t data, uint8_t chn)
	Convert ADC data to voltage without Vref.

float	convert_adc_data_to_voltage_wrt_vref (int32_t data, uint8_t chn)
	Convert ADC data to voltage w.r.t. Vref.

float	convert_adc_raw_into_rtd_resistance (uint32_t adc_raw, float rtd_res, uint8_t chn)
	Convert the ADC raw value into equivalent RTD resistance.

float	ad4170_get_reference_voltage (uint8_t chn)
	Get the reference voltage based on the reference source.

float	ad4170_get_gain_value (uint8_t chn)
	Get the actual ADC gain decimal value.

int32_t	ad4170_disable_conversion (void)
	Disable ADC conversion.

int32_t	ad4170_enable_input_chn (uint8_t input_chn)
	Enable input channel.

int32_t	ad4170_disable_input_chn (uint8_t input_chn)
	Disable input channel.

int32_t	ad4170_apply_excitation (uint8_t input_chn)
	Apply the excitation sources.

int32_t	ad4170_remove_excitation (uint8_t input_chn)
	Remove the excitation sources.

int32_t	ad4170_set_filter (struct ad4170_dev *dev, uint8_t chn, enum ad4170_filter_type filt_type)
	Set filter type.

int32_t	ad4170_set_reference (struct ad4170_dev *dev, uint8_t chn, enum ad4170_ref_select ref)
	Set Reference.

int32_t	ad4170_set_fs (struct ad4170_dev *dev, uint8_t setup, uint8_t chn, uint16_t fs_val)
	Set Reference.

Macro Definition Documentation

◆ AD4170_PGA_GAIN

#define AD4170_PGA_GAIN ( x ) (1 << (x))

Function Documentation

◆ ad4170_apply_excitation()

int32_t ad4170_apply_excitation ( uint8_t input_chn )

Apply the excitation sources.

Parameters

input_chn[in] - Input channel

Returns: 0 in case of success, negative error code otherwise

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◆ ad4170_disable_conversion()

int32_t ad4170_disable_conversion ( void )

Disable ADC conversion.

Returns: 0 in case of success, negative error code otherwise

◆ ad4170_disable_input_chn()

int32_t ad4170_disable_input_chn ( uint8_t input_chn )

Disable input channel.

Parameters

input_chn[in] - Channel to be disabled

Returns: 0 in case of success, negative error otherwise

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◆ ad4170_enable_input_chn()

int32_t ad4170_enable_input_chn ( uint8_t input_chn )

Enable input channel.

Parameters

input_chn[in] - Channel to be enabled

Returns: 0 in case of success, negative error otherwise

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◆ ad4170_get_gain_value()

float ad4170_get_gain_value ( uint8_t chn )

Get the actual ADC gain decimal value.

Parameters

chn[in] - ADC channel

Returns: ADC programmable gain value

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◆ ad4170_get_reference_voltage()

float ad4170_get_reference_voltage ( uint8_t chn )

Get the reference voltage based on the reference source.

Parameters

chn[in] - ADC channel

Returns: Reference voltage

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◆ ad4170_read_converted_sample()

int32_t ad4170_read_converted_sample ( uint32_t * adc_data )

Read ADC raw data for recently sampled channel.

Parameters

adc_data[in,out] - Pointer to adc data read variable

Returns: 0 in case of success, negative error code otherwise

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◆ ad4170_read_single_sample()

int32_t ad4170_read_single_sample	(	uint8_t	input_chn,
		uint32_t *	raw_data
	)

Read the single ADC sample (raw data) for input channel.

Parameters

input_chn[in]	- Input channel to be sampled and read data for
raw_data[in,out]-	ADC raw data

Returns: 0 in case of success, negative error code otherwise

◆ ad4170_remove_excitation()

int32_t ad4170_remove_excitation ( uint8_t input_chn )

Remove the excitation sources.

Parameters

input_chn[in] - Input channel

Returns: 0 in case of success, negative error code otherwise

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◆ ad4170_set_filter()

int32_t ad4170_set_filter	(	struct ad4170_dev *	dev,
		uint8_t	chn,
		enum ad4170_filter_type	filt_type
	)

Set filter type.

Parameters

dev[in,out]	- AD4170 device descriptor
chn[in]	- Channel ID
filt_type[in]	- Filter Type

Returns: 0 in case of success, negative error code otherwise

◆ ad4170_set_fs()

int32_t ad4170_set_fs	(	struct ad4170_dev *	dev,
		uint8_t	setup,
		uint8_t	chn,
		uint16_t	fs_val
	)

Set Reference.

Parameters

dev[in,out]	- AD4170 device descriptor
setup[in]	- Setup ID
chn[in]	- Channel ID
ref[in]	- Reference Type

Returns: 0 in case of success, negative error code otherwise

◆ ad4170_set_reference()

int32_t ad4170_set_reference	(	struct ad4170_dev *	dev,
		uint8_t	chn,
		enum ad4170_ref_select	ref
	)

Set Reference.

Parameters

dev[in,out]	- AD4170 device descriptor
chn[in]	- Channel ID
ref[in]	- Reference Type

Returns: 0 in case of success, negative error code otherwise

◆ convert_adc_data_to_voltage_without_vref()

float convert_adc_data_to_voltage_without_vref	(	int32_t	data,
		uint8_t	chn
	)

Convert ADC data to voltage without Vref.

Parameters

data[in]	- ADC data in straight binary format (signed)
chn[in]	- ADC channel

Returns: voltage

◆ convert_adc_data_to_voltage_wrt_vref()

float convert_adc_data_to_voltage_wrt_vref	(	int32_t	data,
		uint8_t	chn
	)

Convert ADC data to voltage w.r.t. Vref.

Parameters

data[in]	- ADC data in straight binary format (signed)
chn[in]	- ADC channel

Returns: voltage

◆ convert_adc_raw_into_rtd_resistance()

float convert_adc_raw_into_rtd_resistance	(	uint32_t	adc_raw,
		float	rtd_ref,
		uint8_t	chn
	)

Convert the ADC raw value into equivalent RTD resistance.

Parameters

adc_raw[in]	- ADC raw sample
rtd_ref[in]	- RTD reference resistance in ohms
chn[in]	- ADC channel

Returns: RTD resistance value

Note: RTD is biased with constant excitation current. Below formula is based on ratiometric measurement, where fixed value of RTD RREF (reference resistor) and gain is taken into account

◆ convert_adc_sample_into_voltage()

float convert_adc_sample_into_voltage	(	uint32_t	adc_raw,
		uint8_t	chn
	)

Convert the ADC raw value into equivalent voltage.

Parameters

adc_raw[in]-	ADC raw data
chn[in]	- ADC channel

Returns: ADC voltage value

◆ perform_sign_conversion()

int32_t perform_sign_conversion	(	uint32_t	adc_raw_data,
		uint8_t	chn
	)

Perform the sign conversion for handling negative voltages in bipolar mode.

Parameters

adc_raw_data[in]	- ADC raw value
chn[in]	- ADC Channel

Returns: ADC data after signed conversion

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Macros

Functions

Macro Definition Documentation

◆ AD4170_PGA_GAIN

Function Documentation

◆ ad4170_apply_excitation()

◆ ad4170_disable_conversion()

◆ ad4170_disable_input_chn()

◆ ad4170_enable_input_chn()

◆ ad4170_get_gain_value()

◆ ad4170_get_reference_voltage()

◆ ad4170_read_converted_sample()

◆ ad4170_read_single_sample()

◆ ad4170_remove_excitation()

◆ ad4170_set_filter()

◆ ad4170_set_fs()

◆ ad4170_set_reference()

◆ convert_adc_data_to_voltage_without_vref()

◆ convert_adc_data_to_voltage_wrt_vref()

◆ convert_adc_raw_into_rtd_resistance()

◆ convert_adc_sample_into_voltage()

◆ perform_sign_conversion()