iio.h File Reference

API Description

An iio context represents an IIO device

    /* initialize iio */
    iio = mraa_iio_init(IIO_DEV);
    if (iio == NULL) {
        fprintf(stderr, "Failed to initialize IIO device\n");
        mraa_deinit();
        return EXIT_FAILURE;
    }

    status = mraa_iio_write_float(iio, "in_accel_scale", 0.019163);
    if (status != MRAA_SUCCESS) {
        fprintf(stderr, "Failed to write scale to IIO device\n");
        goto err_exit;
    }

    status = mraa_iio_read_float(iio, "in_accel_scale", &iio_float);
    if (status != MRAA_SUCCESS) {
        fprintf(stderr, "Failed to read scale from IIO device\n");
        goto err_exit;
    }

    fprintf(stdout, "IIO scale: %f\n", iio_float);

    status = mraa_iio_write_int(iio, "scan_elements/in_accel_x_en", 1);
    if (status != MRAA_SUCCESS) {
        fprintf(stderr, "Failed to enable axis of the IIO device\n");
        goto err_exit;
    }

    status = mraa_iio_read_int(iio, "scan_elements/in_accel_x_en", &iio_int);
    if (status != MRAA_SUCCESS) {
        fprintf(stderr, "Failed to read enable status from IIO device\n");
        goto err_exit;
    }

    fprintf(stdout, "IIO enable status: %d\n", iio_int);

    status = mraa_iio_trigger_buffer(iio, interrupt, (void*) iio);
    if (status != MRAA_SUCCESS) {
        fprintf(stderr, "Failed to set IIO buffer trigger\n");
        goto err_exit;
    }

    /* wait for the trigger */
    fprintf(stdout, "Waiting for the trigger...\n");
    sleep(100);

    /* close IIO device */
    mraa_iio_close(iio);

Go to the source code of this file.

Data Structures
struct	mraa_iio_channel
struct	mraa_iio_event

Functions
mraa_iio_context	mraa_iio_init (int device)
mraa_result_t	mraa_iio_trigger_buffer (mraa_iio_context dev, void(*fptr)(char *, void *), void *args)
const char *	mraa_iio_get_device_name (mraa_iio_context dev)
int	mraa_iio_get_device_num_by_name (const char *name)
int	mraa_iio_read_size (mraa_iio_context dev)
mraa_iio_channel *	mraa_iio_get_channels (mraa_iio_context dev)
int	mraa_iio_get_channel_count (mraa_iio_context dev)
mraa_result_t	mraa_iio_read_float (mraa_iio_context dev, const char *filename, float *data)
mraa_result_t	mraa_iio_read_int (mraa_iio_context dev, const char *filename, int *data)
mraa_result_t	mraa_iio_read_string (mraa_iio_context dev, const char *filename, char *data, int max_len)
mraa_result_t	mraa_iio_write_float (mraa_iio_context dev, const char *attr_chan, const float data)
mraa_result_t	mraa_iio_write_int (mraa_iio_context dev, const char *attr_chan, const int data)
mraa_result_t	mraa_iio_write_string (mraa_iio_context dev, const char *attr_chan, const char *data)
mraa_result_t	mraa_iio_get_channel_data (mraa_iio_context dev)
mraa_result_t	mraa_iio_get_event_data (mraa_iio_context dev)
mraa_result_t	mraa_iio_event_poll (mraa_iio_context dev, struct iio_event_data *data)
mraa_result_t	mraa_iio_event_setup_callback (mraa_iio_context dev, void(*fptr)(struct iio_event_data *data, void *args), void *args)
mraa_result_t	mraa_iio_event_extract_event (struct iio_event_data *event, int *chan_type, int *modifier, int *type, int *direction, int *channel, int *channel2, int *different)
mraa_result_t	mraa_iio_get_mount_matrix (mraa_iio_context dev, const char *sysfs_name, float mm[9])
mraa_result_t	mraa_iio_create_trigger (mraa_iio_context dev, const char *trigger)
mraa_result_t	mraa_iio_update_channels (mraa_iio_context dev)
mraa_result_t	mraa_iio_close (mraa_iio_context dev)

Typedefs
typedef struct _iio *	mraa_iio_context

Function Documentation

mraa_iio_context mraa_iio_init

(

int

device

)

Initialise iio context

Parameters

device

iio device to use

Returns

i2c context or NULL

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mraa_result_t mraa_iio_trigger_buffer	(	mraa_iio_context	dev,
		void(*)(char *, void *)	fptr,
		void *	args
	)

Trigger buffer

Parameters

dev	The iio context
fptr	Callback
args	Arguments

Returns

Result of operation

const char* mraa_iio_get_device_name

(

mraa_iio_context

dev

)

Get device name

Parameters

dev	The iio context

Returns

Name of the device

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int mraa_iio_get_device_num_by_name

(

const char *

name

)

Get device number

Parameters

name	Name of the device

Returns

Device Number

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int mraa_iio_read_size

(

mraa_iio_context

dev

)

Read size

Parameters

dev	The iio context

Returns

Size

mraa_iio_channel* mraa_iio_get_channels

(

mraa_iio_context

dev

)

Get channels

Parameters

dev	The iio context

Returns

Channels

int mraa_iio_get_channel_count

(

mraa_iio_context

dev

)

Get channels count

Parameters

dev	The iio context

Returns

Channels count

mraa_result_t mraa_iio_read_float	(	mraa_iio_context	dev,
		const char *	filename,
		float *	data
	)

Read float from file

Parameters

dev	The iio context
filename	Filename
data	Data

Returns

Result of operation

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mraa_result_t mraa_iio_read_int	(	mraa_iio_context	dev,
		const char *	filename,
		int *	data
	)

Read int from file

Parameters

dev	The iio context
filename	Filename
data	Data

Returns

Result of operation

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mraa_result_t mraa_iio_read_string	(	mraa_iio_context	dev,
		const char *	filename,
		char *	data,
		int	max_len
	)

Read String from file

Parameters

dev	The iio context
filename	Filename
data	Data
max_len	Max lenght to read

Returns

Result of operation

mraa_result_t mraa_iio_write_float	(	mraa_iio_context	dev,
		const char *	attr_chan,
		const float	data
	)

Write float

Parameters

dev	The iio context
attr_chan	Channel attributes
data	Float to write

Returns

Result of operation

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mraa_result_t mraa_iio_write_int	(	mraa_iio_context	dev,
		const char *	attr_chan,
		const int	data
	)

Write int

Parameters

dev	The iio context
attr_chan	Channel attributes
data	Int to write

Returns

Result of operation

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mraa_result_t mraa_iio_write_string	(	mraa_iio_context	dev,
		const char *	attr_chan,
		const char *	data
	)

Write string

Parameters

dev	The iio context
attr_chan	Channel attributes
data	String to write

Returns

Result of operation

mraa_result_t mraa_iio_get_channel_data

(

mraa_iio_context

dev

)

Get channel data

Parameters

dev	The iio context

Returns

Result of operation

mraa_result_t mraa_iio_get_event_data

(

mraa_iio_context

dev

)

Get event data

Parameters

dev	The iio context

Returns

Result of operation

mraa_result_t mraa_iio_event_poll	(	mraa_iio_context	dev,
		struct iio_event_data *	data
	)

Event poll

Parameters

dev	The iio context
data	Data

Returns

Result of operation

mraa_result_t mraa_iio_event_setup_callback	(	mraa_iio_context	dev,
		void(*)(struct iio_event_data *data, void *args)	fptr,
		void *	args
	)

Setup event callback

Parameters

dev	The iio context
fptr	Callback
args	Arguments

Returns

Result of operation

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mraa_result_t mraa_iio_event_extract_event	(	struct iio_event_data *	event,
		int *	chan_type,
		int *	modifier,
		int *	type,
		int *	direction,
		int *	channel,
		int *	channel2,
		int *	different
	)

Extract event

Parameters

event	Event
chan_type	Channel type
modifier	Modifier
type	Type
direction	Direction
channel	Channel
channel2	Channel2
different	Different

Returns

Result of operation

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mraa_result_t mraa_iio_get_mount_matrix	(	mraa_iio_context	dev,
		const char *	sysfs_name,
		float	mm[9]
	)

Get mount matrix

Parameters

dev	The iio context
sysfs_name	Sysfs name
mm	Matrix

Returns

Result of operation

mraa_result_t mraa_iio_create_trigger	(	mraa_iio_context	dev,
		const char *	trigger
	)

Create trigger

Parameters

dev	The iio context
trigger	Trigger name

Returns

Result of operation

mraa_result_t mraa_iio_update_channels

(

mraa_iio_context

dev

)

Update channels

Parameters

dev	The iio context

Returns

Result of operation

mraa_result_t mraa_iio_close

(

mraa_iio_context

dev

)

De-inits an mraa_iio_context device

Parameters

dev	The iio context

Returns

Result of operation

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Typedef Documentation

typedef struct _iio* mraa_iio_context

Opaque pointer definition to the internal struct _iio

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