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, enum sensor_channel channel, size_t channel_idx, uint16_t *frame_count)
	Get the number of frames in the current buffer.
int(*	get_size_info )(enum sensor_channel channel, size_t *base_size, size_t *frame_size)
	Get the size required to decode a given channel.
int(*	decode )(const uint8_t *buffer, enum sensor_channel channel, size_t channel_idx, uint32_t *fit, uint16_t max_count, void *data_out)
	Decode up to max_count samples 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, enum sensor_channel channel, size_t channel_idx, uint32_t *fit, uint16_t max_count, void *data_out)

Decode up to max_count samples from the buffer.

Decode samples of channel sensor_channel across multiple frames. If there exist multiple instances of the same channel, channel_index is used to differentiate them. As an example, assume a sensor provides 2 distance measurements:

// Decode the first channel instance of 'distance'
decoder->decode(buffer, SENSOR_CHAN_DISTANCE, 0, &fit, 5, out);
...
 
// Decode the second channel instance of 'distance'
decoder->decode(buffer, SENSOR_CHAN_DISTANCE, 1, &fit, 5, out);

Parameters

[in]	buffer	The buffer provided on the RTIO context
[in]	channel	The channel to decode
[in]	channel_idx	The index of the channel
[in,out]	fit	The current frame iterator
[in]	max_count	The maximum number of channels to decode.
[out]	data_out	The decoded data

Returns

0 no more samples to decode

>0 the number of decoded frames

<0 on error

get_frame_count

int(* sensor_decoder_api::get_frame_count) (const uint8_t *buffer, enum sensor_channel channel, size_t channel_idx, uint16_t *frame_count)

Get the number of frames in the current buffer.

Parameters

[in]	buffer	The buffer provided on the RTIO context.
[in]	channel	The channel to get the count for
[in]	channel_idx	The index of the channel
[out]	frame_count	The number of frames on the buffer (at least 1)

Returns

0 on success

-ENOTSUP if the channel/channel_idx aren't found

get_size_info

int(* sensor_decoder_api::get_size_info) (enum sensor_channel 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