Emulated ADC

Emulated ADC backend API. More...

Typedefs
typedef int(*	adc_emul_value_func) (const struct device *dev, unsigned int chan, void *data, uint32_t *result)
	Type definition of the function which is used to obtain ADC mV input values. More...

Functions
int	adc_emul_const_value_set (const struct device *dev, unsigned int chan, uint32_t value)
	Set constant mV value input for emulated ADC chan. More...
int	adc_emul_value_func_set (const struct device *dev, unsigned int chan, adc_emul_value_func func, void *data)
	Set function used to obtain voltage for input of emulated ADC chan. More...
int	adc_emul_ref_voltage_set (const struct device *dev, enum adc_reference ref, uint16_t value)
	Set reference voltage. More...

Detailed Description

Emulated ADC backend API.

Behaviour of emulated ADC is application-defined. As-such, each application may

• define a Device Tree overlay file to indicate the number of ADC controllers as well as the number of channels for each controller
• set default reference voltages in Device Tree or using adc_emul_ref_voltage_set
• asynchronously call adc_emul_const_value_set in order to set constant mV value on emulated ADC input
• asynchronously call adc_emul_value_func_set in order to assign function which will be used to obtain voltage on emulated ADC input

An example of an appropriate Device Tree overlay file is in tests/drivers/adc/adc_api/boards/native_posix.overlay

An example of using emulated ADC backend API is in the file tests/drivers/adc/adc_emul/src/main.c

Typedef Documentation

adc_emul_value_func

typedef int(* adc_emul_value_func) (const struct device *dev, unsigned int chan, void *data, uint32_t *result)

#include <include/zephyr/drivers/adc/adc_emul.h>

Type definition of the function which is used to obtain ADC mV input values.

Parameters

dev	Pointer to the device structure for the driver instance
chan	ADC channel to sample
data	User data which was passed on adc_emul_value_func_set
result	The result value which will be set as input for ADC chan

Returns

0 on success

other as error code which ends ADC context

Function Documentation

adc_emul_const_value_set()

int adc_emul_const_value_set	(	const struct device *	dev,
		unsigned int	chan,
		uint32_t	value
	)

#include <include/zephyr/drivers/adc/adc_emul.h>

Set constant mV value input for emulated ADC chan.

Parameters

dev	The emulated ADC device
chan	The channel of ADC which input is assigned
value	New voltage in mV to assign to chan input

Returns

0 on success

-EINVAL if an invalid argument is provided

adc_emul_ref_voltage_set()

int adc_emul_ref_voltage_set	(	const struct device *	dev,
		enum adc_reference	ref,
		uint16_t	value
	)

#include <include/zephyr/drivers/adc/adc_emul.h>

Set reference voltage.

Parameters

dev	The emulated ADC device
ref	Reference config which is changed
value	New reference voltage in mV

Returns

0 on success

-EINVAL if an invalid argument is provided

adc_emul_value_func_set()

int adc_emul_value_func_set	(	const struct device *	dev,
		unsigned int	chan,
		adc_emul_value_func	func,
		void *	data
	)

#include <include/zephyr/drivers/adc/adc_emul.h>

Set function used to obtain voltage for input of emulated ADC chan.

Parameters

dev	The emulated ADC device
chan	The channel of ADC to which func is assigned
func	New function to assign to chan
data	Pointer to data passed to func on call

Returns

0 on success

-EINVAL if an invalid argument is provided