iio.h File Reference

Public interface. More...

#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <stddef.h>
#include <sys/types.h>
#include <stdbool.h>

Go to the source code of this file.

Data Structures
struct	iio_data_format
	Contains the format of a data sample. More...

Enumerations
enum	iio_chan_type {   IIO_VOLTAGE, IIO_CURRENT, IIO_POWER, IIO_ACCEL,   IIO_ANGL_VEL, IIO_MAGN, IIO_LIGHT, IIO_INTENSITY,   IIO_PROXIMITY, IIO_TEMP, IIO_INCLI, IIO_ROT,   IIO_ANGL, IIO_TIMESTAMP, IIO_CAPACITANCE, IIO_ALTVOLTAGE,   IIO_CCT, IIO_PRESSURE, IIO_HUMIDITYRELATIVE, IIO_ACTIVITY,   IIO_STEPS, IIO_ENERGY, IIO_DISTANCE, IIO_VELOCITY,   IIO_CONCENTRATION, IIO_RESISTANCE, IIO_PH, IIO_CHAN_TYPE_UNKNOWN = INT_MAX }
	IIO channel type. More...
enum	iio_modifier {   IIO_NO_MOD, IIO_MOD_X, IIO_MOD_Y, IIO_MOD_Z,   IIO_MOD_X_AND_Y, IIO_MOD_X_AND_Z, IIO_MOD_Y_AND_Z, IIO_MOD_X_AND_Y_AND_Z,   IIO_MOD_X_OR_Y, IIO_MOD_X_OR_Z, IIO_MOD_Y_OR_Z, IIO_MOD_X_OR_Y_OR_Z,   IIO_MOD_LIGHT_BOTH, IIO_MOD_LIGHT_IR, IIO_MOD_ROOT_SUM_SQUARED_X_Y, IIO_MOD_SUM_SQUARED_X_Y_Z,   IIO_MOD_LIGHT_CLEAR, IIO_MOD_LIGHT_RED, IIO_MOD_LIGHT_GREEN, IIO_MOD_LIGHT_BLUE,   IIO_MOD_QUATERNION, IIO_MOD_TEMP_AMBIENT, IIO_MOD_TEMP_OBJECT, IIO_MOD_NORTH_MAGN,   IIO_MOD_NORTH_TRUE, IIO_MOD_NORTH_MAGN_TILT_COMP, IIO_MOD_NORTH_TRUE_TILT_COMP, IIO_MOD_RUNNING,   IIO_MOD_JOGGING, IIO_MOD_WALKING, IIO_MOD_STILL, IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,   IIO_MOD_I, IIO_MOD_Q, IIO_MOD_CO2, IIO_MOD_VOC }
	IIO channel modifier. More...

Functions
__api struct iio_scan_context *	iio_create_scan_context (const char *backend, unsigned int flags)
	Create a scan context. More...
__api void	iio_scan_context_destroy (struct iio_scan_context *ctx)
	Destroy the given scan context. More...
__api ssize_t	iio_scan_context_get_info_list (struct iio_scan_context *ctx, struct iio_context_info ***info)
	Enumerate available contexts. More...
__api void	iio_context_info_list_free (struct iio_context_info **info)
	Free a context info list. More...
__api __pure const char *	iio_context_info_get_description (const struct iio_context_info *info)
	Get a description of a discovered context. More...
__api __pure const char *	iio_context_info_get_uri (const struct iio_context_info *info)
	Get the URI of a discovered context. More...
__api void	iio_library_get_version (unsigned int *major, unsigned int *minor, char git_tag[8])
	Get the version of the libiio library. More...
__api void	iio_strerror (int err, char *dst, size_t len)
	Get a string description of an error code. More...
__api __cnst bool	iio_has_backend (const char *backend)
	Check if the specified backend is available. More...
__api __cnst unsigned int	iio_get_backends_count (void)
	Get the number of available backends. More...
__api __cnst const char *	iio_get_backend (unsigned int index)
	Retrieve the name of a given backend. More...
__api struct iio_context *	iio_create_default_context (void)
	Create a context from local or remote IIO devices. More...
__api struct iio_context *	iio_create_local_context (void)
	Create a context from local IIO devices (Linux only) More...
__api struct iio_context *	iio_create_xml_context (const char *xml_file)
	Create a context from a XML file. More...
__api struct iio_context *	iio_create_xml_context_mem (const char *xml, size_t len)
	Create a context from XML data in memory. More...
__api struct iio_context *	iio_create_network_context (const char *host)
	Create a context from the network. More...
__api struct iio_context *	iio_create_context_from_uri (const char *uri)
	Create a context from a URI description. More...
__api struct iio_context *	iio_context_clone (const struct iio_context *ctx)
	Duplicate a pre-existing IIO context. More...
__api void	iio_context_destroy (struct iio_context *ctx)
	Destroy the given context. More...
__api int	iio_context_get_version (const struct iio_context *ctx, unsigned int *major, unsigned int *minor, char git_tag[8])
	Get the version of the backend in use. More...
__api __pure const char *	iio_context_get_xml (const struct iio_context *ctx)
	Obtain a XML representation of the given context. More...
__api __pure const char *	iio_context_get_name (const struct iio_context *ctx)
	Get the name of the given context. More...
__api __pure const char *	iio_context_get_description (const struct iio_context *ctx)
	Get a description of the given context. More...
__api __pure unsigned int	iio_context_get_attrs_count (const struct iio_context *ctx)
	Get the number of context-specific attributes. More...
__api int	iio_context_get_attr (const struct iio_context *ctx, unsigned int index, const char **name, const char **value)
	Retrieve the name and value of a context-specific attribute. More...
__api const char *	iio_context_get_attr_value (const struct iio_context *ctx, const char *name)
	Retrieve the value of a context-specific attribute. More...
__api __pure unsigned int	iio_context_get_devices_count (const struct iio_context *ctx)
	Enumerate the devices found in the given context. More...
__api __pure struct iio_device *	iio_context_get_device (const struct iio_context *ctx, unsigned int index)
	Get the device present at the given index. More...
__api __pure struct iio_device *	iio_context_find_device (const struct iio_context *ctx, const char *name)
	Try to find a device structure by its name of ID. More...
__api int	iio_context_set_timeout (struct iio_context *ctx, unsigned int timeout_ms)
	Set a timeout for I/O operations. More...
__api __pure const struct iio_context *	iio_device_get_context (const struct iio_device *dev)
	Retrieve a pointer to the iio_context structure. More...
__api __pure const char *	iio_device_get_id (const struct iio_device *dev)
	Retrieve the device ID (e.g. iio:device0) More...
__api __pure const char *	iio_device_get_name (const struct iio_device *dev)
	Retrieve the device name (e.g. xadc) More...
__api __pure unsigned int	iio_device_get_channels_count (const struct iio_device *dev)
	Enumerate the channels of the given device. More...
__api __pure unsigned int	iio_device_get_attrs_count (const struct iio_device *dev)
	Enumerate the device-specific attributes of the given device. More...
__api __pure struct iio_channel *	iio_device_get_channel (const struct iio_device *dev, unsigned int index)
	Get the channel present at the given index. More...
__api __pure const char *	iio_device_get_attr (const struct iio_device *dev, unsigned int index)
	Get the device-specific attribute present at the given index. More...
__api __pure struct iio_channel *	iio_device_find_channel (const struct iio_device *dev, const char *name, bool output)
	Try to find a channel structure by its name of ID. More...
__api __pure const char *	iio_device_find_attr (const struct iio_device *dev, const char *name)
	Try to find a device-specific attribute by its name. More...
__api ssize_t	iio_device_attr_read (const struct iio_device *dev, const char *attr, char *dst, size_t len)
	Read the content of the given device-specific attribute. More...
__api int	iio_device_attr_read_all (struct iio_device *dev, int(*cb)(struct iio_device *dev, const char *attr, const char *value, size_t len, void *d), void *data)
	Read the content of all device-specific attributes. More...
__api int	iio_device_attr_read_bool (const struct iio_device *dev, const char *attr, bool *val)
	Read the content of the given device-specific attribute. More...
__api int	iio_device_attr_read_longlong (const struct iio_device *dev, const char *attr, long long *val)
	Read the content of the given device-specific attribute. More...
__api int	iio_device_attr_read_double (const struct iio_device *dev, const char *attr, double *val)
	Read the content of the given device-specific attribute. More...
__api ssize_t	iio_device_attr_write (const struct iio_device *dev, const char *attr, const char *src)
	Set the value of the given device-specific attribute. More...
__api ssize_t	iio_device_attr_write_raw (const struct iio_device *dev, const char *attr, const void *src, size_t len)
	Set the value of the given device-specific attribute. More...
__api int	iio_device_attr_write_all (struct iio_device *dev, ssize_t(*cb)(struct iio_device *dev, const char *attr, void *buf, size_t len, void *d), void *data)
	Set the values of all device-specific attributes. More...
__api int	iio_device_attr_write_bool (const struct iio_device *dev, const char *attr, bool val)
	Set the value of the given device-specific attribute. More...
__api int	iio_device_attr_write_longlong (const struct iio_device *dev, const char *attr, long long val)
	Set the value of the given device-specific attribute. More...
__api int	iio_device_attr_write_double (const struct iio_device *dev, const char *attr, double val)
	Set the value of the given device-specific attribute. More...
__api void	iio_device_set_data (struct iio_device *dev, void *data)
	Associate a pointer to an iio_device structure. More...
__api void *	iio_device_get_data (const struct iio_device *dev)
	Retrieve a previously associated pointer of an iio_device structure. More...
__api int	iio_device_get_trigger (const struct iio_device *dev, const struct iio_device **trigger)
	Retrieve the trigger of a given device. More...
__api int	iio_device_set_trigger (const struct iio_device *dev, const struct iio_device *trigger)
	Associate a trigger to a given device. More...
__api __pure bool	iio_device_is_trigger (const struct iio_device *dev)
	Return True if the given device is a trigger. More...
__api int	iio_device_set_kernel_buffers_count (const struct iio_device *dev, unsigned int nb_buffers)
	Configure the number of kernel buffers for a device. More...
__api __pure const struct iio_device *	iio_channel_get_device (const struct iio_channel *chn)
	Retrieve a pointer to the iio_device structure. More...
__api __pure const char *	iio_channel_get_id (const struct iio_channel *chn)
	Retrieve the channel ID (e.g. voltage0) More...
__api __pure const char *	iio_channel_get_name (const struct iio_channel *chn)
	Retrieve the channel name (e.g. vccint) More...
__api __pure bool	iio_channel_is_output (const struct iio_channel *chn)
	Return True if the given channel is an output channel. More...
__api __pure bool	iio_channel_is_scan_element (const struct iio_channel *chn)
	Return True if the given channel is a scan element. More...
__api __pure unsigned int	iio_channel_get_attrs_count (const struct iio_channel *chn)
	Enumerate the channel-specific attributes of the given channel. More...
__api __pure const char *	iio_channel_get_attr (const struct iio_channel *chn, unsigned int index)
	Get the channel-specific attribute present at the given index. More...
__api __pure const char *	iio_channel_find_attr (const struct iio_channel *chn, const char *name)
	Try to find a channel-specific attribute by its name. More...
__api __pure const char *	iio_channel_attr_get_filename (const struct iio_channel *chn, const char *attr)
	Retrieve the filename of an attribute. More...
__api ssize_t	iio_channel_attr_read (const struct iio_channel *chn, const char *attr, char *dst, size_t len)
	Read the content of the given channel-specific attribute. More...
__api int	iio_channel_attr_read_all (struct iio_channel *chn, int(*cb)(struct iio_channel *chn, const char *attr, const char *val, size_t len, void *d), void *data)
	Read the content of all channel-specific attributes. More...
__api int	iio_channel_attr_read_bool (const struct iio_channel *chn, const char *attr, bool *val)
	Read the content of the given channel-specific attribute. More...
__api int	iio_channel_attr_read_longlong (const struct iio_channel *chn, const char *attr, long long *val)
	Read the content of the given channel-specific attribute. More...
__api int	iio_channel_attr_read_double (const struct iio_channel *chn, const char *attr, double *val)
	Read the content of the given channel-specific attribute. More...
__api ssize_t	iio_channel_attr_write (const struct iio_channel *chn, const char *attr, const char *src)
	Set the value of the given channel-specific attribute. More...
__api ssize_t	iio_channel_attr_write_raw (const struct iio_channel *chn, const char *attr, const void *src, size_t len)
	Set the value of the given channel-specific attribute. More...
__api int	iio_channel_attr_write_all (struct iio_channel *chn, ssize_t(*cb)(struct iio_channel *chn, const char *attr, void *buf, size_t len, void *d), void *data)
	Set the values of all channel-specific attributes. More...
__api int	iio_channel_attr_write_bool (const struct iio_channel *chn, const char *attr, bool val)
	Set the value of the given channel-specific attribute. More...
__api int	iio_channel_attr_write_longlong (const struct iio_channel *chn, const char *attr, long long val)
	Set the value of the given channel-specific attribute. More...
__api int	iio_channel_attr_write_double (const struct iio_channel *chn, const char *attr, double val)
	Set the value of the given channel-specific attribute. More...
__api void	iio_channel_enable (struct iio_channel *chn)
	Enable the given channel. More...
__api void	iio_channel_disable (struct iio_channel *chn)
	Disable the given channel. More...
__api bool	iio_channel_is_enabled (const struct iio_channel *chn)
	Returns True if the channel is enabled. More...
__api size_t	iio_channel_read_raw (const struct iio_channel *chn, struct iio_buffer *buffer, void *dst, size_t len)
__api size_t	iio_channel_read (const struct iio_channel *chn, struct iio_buffer *buffer, void *dst, size_t len)
__api size_t	iio_channel_write_raw (const struct iio_channel *chn, struct iio_buffer *buffer, const void *src, size_t len)
__api size_t	iio_channel_write (const struct iio_channel *chn, struct iio_buffer *buffer, const void *src, size_t len)
__api void	iio_channel_set_data (struct iio_channel *chn, void *data)
	Associate a pointer to an iio_channel structure. More...
__api void *	iio_channel_get_data (const struct iio_channel *chn)
	Retrieve a previously associated pointer of an iio_channel structure. More...
__api __pure enum iio_chan_type	iio_channel_get_type (const struct iio_channel *chn)
	Get the type of the given channel. More...
__api __pure enum iio_modifier	iio_channel_get_modifier (const struct iio_channel *chn)
	Get the modifier type of the given channel. More...
__api __pure const struct iio_device *	iio_buffer_get_device (const struct iio_buffer *buf)
	Retrieve a pointer to the iio_device structure. More...
__api struct iio_buffer *	iio_device_create_buffer (const struct iio_device *dev, size_t samples_count, bool cyclic)
	Create an input or output buffer associated to the given device. More...
__api void	iio_buffer_destroy (struct iio_buffer *buf)
	Destroy the given buffer. More...
__api int	iio_buffer_get_poll_fd (struct iio_buffer *buf)
	Get a pollable file descriptor. More...
__api int	iio_buffer_set_blocking_mode (struct iio_buffer *buf, bool blocking)
	Make iio_buffer_refill() and iio_buffer_push() blocking or not. More...
__api ssize_t	iio_buffer_refill (struct iio_buffer *buf)
	Fetch more samples from the hardware. More...
__api ssize_t	iio_buffer_push (struct iio_buffer *buf)
	Send the samples to the hardware. More...
__api ssize_t	iio_buffer_push_partial (struct iio_buffer *buf, size_t samples_count)
	Send a given number of samples to the hardware. More...
__api void	iio_buffer_cancel (struct iio_buffer *buf)
	Cancel all buffer operations. More...
__api void *	iio_buffer_start (const struct iio_buffer *buf)
	Get the start address of the buffer. More...
__api void *	iio_buffer_first (const struct iio_buffer *buf, const struct iio_channel *chn)
	Find the first sample of a channel in a buffer. More...
__api ptrdiff_t	iio_buffer_step (const struct iio_buffer *buf)
	Get the step size between two samples of one channel. More...
__api void *	iio_buffer_end (const struct iio_buffer *buf)
	Get the address that follows the last sample in a buffer. More...
__api ssize_t	iio_buffer_foreach_sample (struct iio_buffer *buf, ssize_t(*callback)(const struct iio_channel *chn, void *src, size_t bytes, void *d), void *data)
	Call the supplied callback for each sample found in a buffer. More...
__api void	iio_buffer_set_data (struct iio_buffer *buf, void *data)
	Associate a pointer to an iio_buffer structure. More...
__api void *	iio_buffer_get_data (const struct iio_buffer *buf)
	Retrieve a previously associated pointer of an iio_buffer structure. More...
__api ssize_t	iio_device_get_sample_size (const struct iio_device *dev)
	Get the current sample size. More...
__api __pure long	iio_channel_get_index (const struct iio_channel *chn)
	Get the index of the given channel. More...
__api __cnst const struct iio_data_format *	iio_channel_get_data_format (const struct iio_channel *chn)
	Get a pointer to a channel's data format structure. More...
__api void	iio_channel_convert (const struct iio_channel *chn, void *dst, const void *src)
	Convert the sample from hardware format to host format. More...
__api void	iio_channel_convert_inverse (const struct iio_channel *chn, void *dst, const void *src)
	Convert the sample from host format to hardware format. More...
__api __pure unsigned int	iio_device_get_debug_attrs_count (const struct iio_device *dev)
	Enumerate the debug attributes of the given device. More...
__api __pure const char *	iio_device_get_debug_attr (const struct iio_device *dev, unsigned int index)
	Get the debug attribute present at the given index. More...
__api __pure const char *	iio_device_find_debug_attr (const struct iio_device *dev, const char *name)
	Try to find a debug attribute by its name. More...
__api ssize_t	iio_device_debug_attr_read (const struct iio_device *dev, const char *attr, char *dst, size_t len)
	Read the content of the given debug attribute. More...
__api int	iio_device_debug_attr_read_all (struct iio_device *dev, int(*cb)(struct iio_device *dev, const char *attr, const char *value, size_t len, void *d), void *data)
	Read the content of all debug attributes. More...
__api ssize_t	iio_device_debug_attr_write (const struct iio_device *dev, const char *attr, const char *src)
	Set the value of the given debug attribute. More...
__api ssize_t	iio_device_debug_attr_write_raw (const struct iio_device *dev, const char *attr, const void *src, size_t len)
	Set the value of the given debug attribute. More...
__api int	iio_device_debug_attr_write_all (struct iio_device *dev, ssize_t(*cb)(struct iio_device *dev, const char *attr, void *buf, size_t len, void *d), void *data)
	Set the values of all debug attributes. More...
__api int	iio_device_debug_attr_read_bool (const struct iio_device *dev, const char *attr, bool *val)
	Read the content of the given debug attribute. More...
__api int	iio_device_debug_attr_read_longlong (const struct iio_device *dev, const char *attr, long long *val)
	Read the content of the given debug attribute. More...
__api int	iio_device_debug_attr_read_double (const struct iio_device *dev, const char *attr, double *val)
	Read the content of the given debug attribute. More...
__api int	iio_device_debug_attr_write_bool (const struct iio_device *dev, const char *attr, bool val)
	Set the value of the given debug attribute. More...
__api int	iio_device_debug_attr_write_longlong (const struct iio_device *dev, const char *attr, long long val)
	Set the value of the given debug attribute. More...
__api int	iio_device_debug_attr_write_double (const struct iio_device *dev, const char *attr, double val)
	Set the value of the given debug attribute. More...
__api int	iio_device_identify_filename (const struct iio_device *dev, const char *filename, struct iio_channel **chn, const char **attr)
	Identify the channel or debug attribute corresponding to a filename. More...
__api int	iio_device_reg_write (struct iio_device *dev, uint32_t address, uint32_t value)
	Set the value of a hardware register. More...
__api int	iio_device_reg_read (struct iio_device *dev, uint32_t address, uint32_t *value)
	Get the value of a hardware register. More...

Detailed Description

Public interface.

Enumeration Type Documentation

enum iio_chan_type

IIO channel type.

A IIO channel has a type specifying the type of data associated with the channel.

enum iio_modifier

IIO channel modifier.

In a addition to a type a IIO channel can optionally have a channel modifier further specifying the data type of of the channel.