i2s_config Struct Reference

Interface configuration options. More...

#include <i2s.h>

Data Fields
uint8_t	word_size
uint8_t	channels
i2s_fmt_t	format
i2s_opt_t	options
uint32_t	frame_clk_freq
struct k_mem_slab *	mem_slab
size_t	block_size
int32_t	timeout

Detailed Description

Interface configuration options.

Memory slab pointed to by the mem_slab field has to be defined and initialized by the user. For I2S driver to function correctly number of memory blocks in a slab has to be at least 2 per queue. Size of the memory block should be multiple of frame_size where frame_size = (channels * word_size_bytes). As an example 16 bit word will occupy 2 bytes, 24 or 32 bit word will occupy 4 bytes.

Please check Zephyr Kernel Primer for more information on memory slabs.

Remarks

When I2S data format is selected parameter channels is ignored, number of words in a frame is always 2.

Parameters

word_size	Number of bits representing one data word.
channels	Number of words per frame.
format	Data stream format as defined by I2S_FMT_* constants.
options	Configuration options as defined by I2S_OPT_* constants.
frame_clk_freq	Frame clock (WS) frequency, this is sampling rate.
mem_slab	memory slab to store RX/TX data.
block_size	Size of one RX/TX memory block (buffer) in bytes.
timeout	Read/Write timeout. Number of milliseconds to wait in case TX queue is full or RX queue is empty, or 0, or SYS_FOREVER_MS.

Field Documentation

block_size

size_t i2s_config::block_size

channels

uint8_t i2s_config::channels

format

i2s_fmt_t i2s_config::format

frame_clk_freq

uint32_t i2s_config::frame_clk_freq

mem_slab

struct k_mem_slab* i2s_config::mem_slab

options

i2s_opt_t i2s_config::options

timeout

int32_t i2s_config::timeout

word_size

uint8_t i2s_config::word_size

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

• include/drivers/i2s.h