sensor_decoder_api Struct Reference

Decodes a single raw data buffer. More...

#include <sensor.h>

Data Fields
int(*	get_frame_count )(const uint8_t *buffer, struct sensor_chan_spec chan_spec, uint16_t *frame_count)
	Get the frame_count for a specified chan_spec from the buffer.
int(*	get_size_info )(struct sensor_chan_spec channel, size_t *base_size, size_t *frame_size)
	Get the size required to decode a given channel.
int(*	decode )(const uint8_t *buffer, struct sensor_chan_spec chan_spec, uint32_t *fit, uint16_t max_count, void *data_out)
	Decode up to max_count frames specified by chan_spec from the buffer.
bool(*	has_trigger )(const uint8_t *buffer, enum sensor_trigger_type trigger)
	Check if the given trigger type is present.

Detailed Description

Decodes a single raw data buffer.

Data buffers are provided on the RTIO context that's supplied to sensor_read.

Field Documentation

decode

int(* sensor_decoder_api::decode) (const uint8_t *buffer, struct sensor_chan_spec chan_spec, uint32_t *fit, uint16_t max_count, void *data_out)

Decode up to max_count frames specified by chan_spec from the buffer.

Sample showing the process of decoding at most MAX_FRAMES for each distance sensor channel. The frame iterator is reset for each new channel to allow the full history of each channel to be decoded.

for (int i = 0; i < NUM_DISTANCE_CHANNELS; i++) {
    fit = 0;
    decoder->decode(buffer, {SENSOR_CHAN_DISTANCE, i}, &fit, MAX_FRAMES, out);
}

Parameters

[in]	buffer	Buffer provided on the RTIO context
[in]	chan_spec	Channel specification to decode
[in,out]	fit	Current frame iterator
[in]	max_count	Maximum number of frames to decode
[out]	data_out	Decoded data

Returns

Number of frames that were decoded

Return values

-EINVAL	Invalid parameters or unsupported channel
-ENODATA	Requested data type not present in the frame

get_frame_count

int(* sensor_decoder_api::get_frame_count) (const uint8_t *buffer, struct sensor_chan_spec chan_spec, uint16_t *frame_count)

Get the frame_count for a specified chan_spec from the buffer.

Parameters

[in]	buffer	The buffer provided via the RTIO context
[in]	chan_spec	The channel specification to count
[out]	frame_count	The frame count for a specified chan_spec

Return values

0	On success
-EINVAL	Invalid channel specification

get_size_info

int(* sensor_decoder_api::get_size_info) (struct sensor_chan_spec channel, size_t *base_size, size_t *frame_size)

Get the size required to decode a given channel.

When decoding a single frame, use base_size. For every additional frame, add another frame_size. As an example, to decode 3 frames use: 'base_size + 2 * frame_size'.

Parameters

[in]	channel	The channel to query
[out]	base_size	The size of decoding the first frame
[out]	frame_size	The additional size of every additional frame

Returns

0 on success

-ENOTSUP if the channel is not supported

has_trigger

bool(* sensor_decoder_api::has_trigger) (const uint8_t *buffer, enum sensor_trigger_type trigger)

Check if the given trigger type is present.

Parameters

[in]	buffer	The buffer provided on the RTIO context
[in]	trigger	The trigger type in question

Returns

Whether the trigger is present in the buffer

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The documentation for this struct was generated from the following file:

• zephyr/drivers/sensor.h