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[nrf fromtree] tests: boards: nrf: i2s: i2s_divider: Confirm CLK divider value
Frame rate selected by the user may not be obtained due to PCLK frequency and finite number of clock divider values. In such case, driver shall select divider that results in frame clock rate closest to the requested value. There was a bug that was discarding perfect match divider. Add test which confirms correct clock divider selection. Signed-off-by: Sebastian Głąb <[email protected]> (cherry picked from commit af43487)
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‎tests/boards/nrf/i2s/i2s_divider/CMakeLists.txt‎

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# SPDX-License-Identifier: Apache-2.0
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(i2s_divider)
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FILE(GLOB app_sources src/*.c)
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target_sources(app PRIVATE ${app_sources})

‎tests/boards/nrf/i2s/i2s_divider/boards/nrf52840dk_nrf52840.overlay‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/ {
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aliases {
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i2s-node0 = &i2s0;
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};
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};
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&pinctrl {
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i2s0_default_alt: i2s0_default_alt {
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group1 {
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psels = <NRF_PSEL(I2S_SCK_M, 1, 5)>,
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<NRF_PSEL(I2S_LRCK_M, 1, 6)>,
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<NRF_PSEL(I2S_SDOUT, 1, 1)>,
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<NRF_PSEL(I2S_SDIN, 1, 2)>;
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};
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};
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};
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&i2s0 {
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status = "okay";
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pinctrl-0 = <&i2s0_default_alt>;
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pinctrl-names = "default";
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};

‎tests/boards/nrf/i2s/i2s_divider/boards/nrf5340dk_nrf5340_cpuapp.overlay‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/ {
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aliases {
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i2s-node0 = &i2s0;
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};
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};
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&pinctrl {
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i2s0_default_alt: i2s0_default_alt {
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group1 {
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psels = <NRF_PSEL(I2S_SCK_M, 1, 6)>,
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<NRF_PSEL(I2S_LRCK_M, 1, 7)>,
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<NRF_PSEL(I2S_SDOUT, 0, 4)>,
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<NRF_PSEL(I2S_SDIN, 0, 5)>;
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};
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};
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};
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&uart1 {
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status = "disabled";
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};
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&i2s0 {
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status = "okay";
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pinctrl-0 = <&i2s0_default_alt>;
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pinctrl-names = "default";
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};

‎tests/boards/nrf/i2s/i2s_divider/boards/nrf54l15dk_nrf54l15_cpuapp.overlay‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/ {
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aliases {
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i2s-node0 = &i2s20;
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};
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};
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&pinctrl {
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i2s20_default_alt: i2s20_default_alt {
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group1 {
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psels = <NRF_PSEL(I2S_SCK_M, 1, 11)>,
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<NRF_PSEL(I2S_LRCK_M, 1, 12)>,
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<NRF_PSEL(I2S_SDOUT, 1, 8)>,
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<NRF_PSEL(I2S_SDIN, 1, 9)>;
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};
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};
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};
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&i2s20 {
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status = "okay";
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pinctrl-0 = <&i2s20_default_alt>;
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pinctrl-names = "default";
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};

‎tests/boards/nrf/i2s/i2s_divider/prj.conf‎

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CONFIG_ZTEST=y
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CONFIG_I2S=y
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CONFIG_I2S_LOG_LEVEL_INF=y

‎tests/boards/nrf/i2s/i2s_divider/src/main.c‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/ztest.h>
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#include <zephyr/drivers/i2s.h>
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#include <zephyr/sys/iterable_sections.h>
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#define I2S_DEV_NODE DT_ALIAS(i2s_node0)
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#define WORD_SIZE 16U
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#define NUMBER_OF_CHANNELS 2
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#define FRAME_CLK_FREQ 44100
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#define NUM_BLOCKS 2
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#define TIMEOUT 1000
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#define SAMPLES_COUNT 4
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/* Each word has one bit set */
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static const int16_t data[SAMPLES_COUNT] = {16, 32, 64, 128};
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#define BLOCK_SIZE (2 * sizeof(data))
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#ifdef CONFIG_NOCACHE_MEMORY
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#define MEM_SLAB_CACHE_ATTR __nocache
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#else
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#define MEM_SLAB_CACHE_ATTR
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#endif /* CONFIG_NOCACHE_MEMORY */
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static char MEM_SLAB_CACHE_ATTR __aligned(WB_UP(32))
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_k_mem_slab_buf_tx_0_mem_slab[NUM_BLOCKS * WB_UP(BLOCK_SIZE)];
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STRUCT_SECTION_ITERABLE(k_mem_slab, tx_0_mem_slab) =
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Z_MEM_SLAB_INITIALIZER(tx_0_mem_slab, _k_mem_slab_buf_tx_0_mem_slab,
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WB_UP(BLOCK_SIZE), NUM_BLOCKS);
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static const struct device *dev_i2s;
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static const struct i2s_config default_i2s_cfg = {
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.word_size = WORD_SIZE,
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.channels = NUMBER_OF_CHANNELS,
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.format = I2S_FMT_DATA_FORMAT_I2S,
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.frame_clk_freq = FRAME_CLK_FREQ,
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.block_size = BLOCK_SIZE,
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.timeout = TIMEOUT,
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.options = I2S_OPT_FRAME_CLK_MASTER | I2S_OPT_BIT_CLK_MASTER,
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.mem_slab = &tx_0_mem_slab,
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};
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/** @brief Check actual PCM rate at frame_clk_freq=8000.
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*
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* - Configure I2S stream.
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*/
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ZTEST(drivers_i2s_clk_div, test_i2s_frame_clk_freq_08000)
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{
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struct i2s_config i2s_cfg = default_i2s_cfg;
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int ret;
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i2s_cfg.frame_clk_freq = 8000;
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ret = i2s_configure(dev_i2s, I2S_DIR_TX, &i2s_cfg);
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zassert_ok(ret, "i2s_configure() returned %d", ret);
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}
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/** @brief Check actual PCM rate at frame_clk_freq=16000.
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*
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* - Configure I2S stream.
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*/
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ZTEST(drivers_i2s_clk_div, test_i2s_frame_clk_freq_16000)
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{
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struct i2s_config i2s_cfg = default_i2s_cfg;
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int ret;
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i2s_cfg.frame_clk_freq = 16000;
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ret = i2s_configure(dev_i2s, I2S_DIR_TX, &i2s_cfg);
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zassert_ok(ret, "i2s_configure() returned %d", ret);
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}
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/** @brief Check actual PCM rate at frame_clk_freq=32000.
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*
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* - Configure I2S stream.
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*/
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ZTEST(drivers_i2s_clk_div, test_i2s_frame_clk_freq_32000)
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{
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struct i2s_config i2s_cfg = default_i2s_cfg;
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int ret;
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i2s_cfg.frame_clk_freq = 32000;
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ret = i2s_configure(dev_i2s, I2S_DIR_TX, &i2s_cfg);
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zassert_ok(ret, "i2s_configure() returned %d", ret);
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}
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/** @brief Check actual PCM rate at frame_clk_freq=44100.
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*
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* - Configure I2S stream.
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*/
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ZTEST(drivers_i2s_clk_div, test_i2s_frame_clk_freq_44100)
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{
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struct i2s_config i2s_cfg = default_i2s_cfg;
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int ret;
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i2s_cfg.frame_clk_freq = 44100;
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ret = i2s_configure(dev_i2s, I2S_DIR_TX, &i2s_cfg);
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zassert_ok(ret, "i2s_configure() returned %d", ret);
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}
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/** @brief Check actual PCM rate at frame_clk_freq=48000.
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*
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* - Configure I2S stream.
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*/
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ZTEST(drivers_i2s_clk_div, test_i2s_frame_clk_freq_48000)
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{
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struct i2s_config i2s_cfg = default_i2s_cfg;
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int ret;
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i2s_cfg.frame_clk_freq = 48000;
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ret = i2s_configure(dev_i2s, I2S_DIR_TX, &i2s_cfg);
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zassert_ok(ret, "i2s_configure() returned %d", ret);
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}
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/** @brief Check actual PCM rate at frame_clk_freq=88200.
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*
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* - Configure I2S stream.
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*/
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ZTEST(drivers_i2s_clk_div, test_i2s_frame_clk_freq_88200)
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{
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struct i2s_config i2s_cfg = default_i2s_cfg;
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int ret;
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i2s_cfg.frame_clk_freq = 88200;
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ret = i2s_configure(dev_i2s, I2S_DIR_TX, &i2s_cfg);
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zassert_ok(ret, "i2s_configure() returned %d", ret);
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}
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/** @brief Check actual PCM rate at frame_clk_freq=96000.
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*
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* - Configure I2S stream.
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*/
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ZTEST(drivers_i2s_clk_div, test_i2s_frame_clk_freq_96000)
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{
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struct i2s_config i2s_cfg = default_i2s_cfg;
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int ret;
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i2s_cfg.frame_clk_freq = 96000;
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ret = i2s_configure(dev_i2s, I2S_DIR_TX, &i2s_cfg);
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zassert_ok(ret, "i2s_configure() returned %d", ret);
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}
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static void *suite_setup(void)
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{
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/* Check I2S Device. */
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dev_i2s = DEVICE_DT_GET_OR_NULL(I2S_DEV_NODE);
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zassert_not_null(dev_i2s, "I2S device not found");
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zassert(device_is_ready(dev_i2s), "I2S device not ready");
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return 0;
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}
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ZTEST_SUITE(drivers_i2s_clk_div, NULL, suite_setup, NULL, NULL, NULL);

‎tests/boards/nrf/i2s/i2s_divider/testcase.yaml‎

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tests:
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boards.nrf.i2s.i2s_divider:
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tags:
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- drivers
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- i2s
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harness: console
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harness_config:
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type: multi_line
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ordered: true
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regex:
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- "test_i2s_frame_clk_freq_08000"
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- "I2S MCK frequency: 256000, actual PCM rate: 8000"
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- "test_i2s_frame_clk_freq_16000"
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- "I2S MCK frequency: 507936, actual PCM rate: 15873"
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- "test_i2s_frame_clk_freq_32000"
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- "I2S MCK frequency: 1032258, actual PCM rate: 32258"
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- "test_i2s_frame_clk_freq_44100"
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- "I2S MCK frequency: 1391304, actual PCM rate: 43478"
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- "test_i2s_frame_clk_freq_48000"
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- "I2S MCK frequency: 1523809, actual PCM rate: 47619"
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- "test_i2s_frame_clk_freq_88200"
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- "I2S MCK frequency: 2909090, actual PCM rate: 90909"
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- "test_i2s_frame_clk_freq_96000"
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- "I2S MCK frequency: 3200000, actual PCM rate: 100000"
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- "PROJECT EXECUTION SUCCESSFUL"
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platform_allow:
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf54l15dk/nrf54l15/cpuapp
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integration_platforms:
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- nrf52840dk/nrf52840
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- nrf54l15dk/nrf54l15/cpuapp

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