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Gang He
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samples: drivers: audio: Add codec loopback sample.
Add audio loop back sample Signed-off-by: Gang He <[email protected]>
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‎samples/drivers/audio/codec/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(codec)
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target_sources(app PRIVATE src/main.c)

‎samples/drivers/audio/codec/README.rst‎

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.. zephyr:code-sample:: codec
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:name: audio codec
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mic to speaker loopback.
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Overview
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********
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A simple sample that to demo audio speaker play, and mic to speaker loopback functions.
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Building and Running
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********************
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This application can be built and executed on QEMU as follows:
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.. zephyr-app-commands::
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:zephyr-app: samples/drivers/audio/codec
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:host-os: unix
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:board: sf32lb52_devkit_lcd
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:goals: run
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:compact:
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To build for another board, change "sf32lb52_devkit_lcd" above to that board's name.
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Sample Output
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=============
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.. code-block:: console
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mic to speaker loopback.

‎samples/drivers/audio/codec/prj.conf‎

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CONFIG_AUDIO=y
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CONFIG_LOG=y
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CONFIG_AUDIO_CODEC=y

‎samples/drivers/audio/codec/sample.yaml‎

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sample:
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description: onchip audio codec example
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application
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name: audio codec
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common:
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filter: dt_nodelabel_enabled(audcodec)
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min_ram: 2
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min_flash: 16
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tags: audio
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integration_platforms:
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- sf32lb52_devkit_lcd
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harness: console
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harness_config:
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type: one_line
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regex:
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- "mic to speaker loopback"
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tests:
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sample.drivers.audio.codec:{}

‎samples/drivers/audio/codec/src/main.c‎

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/*
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* Copyright 2025 SiFli Technologies(Nanjing) Co., Ltd
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdio.h>
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#include <zephyr/device.h>
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#include <zephyr/kernel.h>
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#include <zephyr/devicetree.h>
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#include <zephyr/audio/codec.h>
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#define AUDIO_BLOCK_SIZE 320
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#define SPEAKER_VOL 15
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static bool loopback;
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static uint8_t *audio_data_p;
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static uint8_t __aligned(4) pcm_16k[] = {
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0x01, 0x00, 0xFE, 0x17, 0x55, 0x2C, 0xEB, 0x39, 0xB1, 0x3E, 0xEC, 0x39, 0x55, 0x2C, 0xFE,
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0x17, 0x01, 0x00, 0x02, 0xE8, 0xAC, 0xD3, 0x15, 0xC6, 0x4F, 0xC1, 0x15, 0xC6, 0xAC, 0xD3,
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0x03, 0xE8, 0x00, 0x00, 0xFD, 0x17, 0x54, 0x2C, 0xEB, 0x39, 0xB1, 0x3E, 0xEC, 0x39, 0x54,
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0x2C, 0xFE, 0x17, 0x00, 0x00, 0x02, 0xE8, 0xAB, 0xD3, 0x15, 0xC6, 0x4F, 0xC1, 0x15, 0xC6,
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0xAC, 0xD3, 0x02, 0xE8, 0x00, 0x00, 0xFD, 0x17, 0x54, 0x2C, 0xEC, 0x39, 0xB1, 0x3E, 0xEB,
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0x39, 0x55, 0x2C, 0xFE, 0x17, 0xFF, 0xFF, 0x03, 0xE8, 0xAB, 0xD3, 0x14, 0xC6, 0x4F, 0xC1,
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0x14, 0xC6, 0xAB, 0xD3, 0x02, 0xE8, 0x00, 0x00, 0xFE, 0x17, 0x55, 0x2C, 0xEC, 0x39, 0xB1,
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0x3E, 0xEC, 0x39, 0x54, 0x2C, 0xFD, 0x17, 0x01, 0x00, 0x02, 0xE8, 0xAC, 0xD3, 0x15, 0xC6,
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0x4F, 0xC1, 0x15, 0xC6, 0xAB, 0xD3, 0x02, 0xE8, 0x00, 0x00, 0xFE, 0x17, 0x55, 0x2C, 0xEB,
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0x39, 0xB1, 0x3E, 0xEB, 0x39, 0x54, 0x2C, 0xFD, 0x17, 0x00, 0x00, 0x02, 0xE8, 0xAC, 0xD3,
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0x14, 0xC6, 0x50, 0xC1, 0x14, 0xC6, 0xAC, 0xD3, 0x02, 0xE8, 0x01, 0x00, 0xFE, 0x17, 0x54,
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0x2C, 0xEB, 0x39, 0xB1, 0x3E, 0xEB, 0x39, 0x54, 0x2C, 0xFE, 0x17, 0x00, 0x00, 0x03, 0xE8,
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0xAC, 0xD3, 0x14, 0xC6, 0x4F, 0xC1, 0x14, 0xC6, 0xAC, 0xD3, 0x02, 0xE8, 0x00, 0x00, 0xFD,
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0x17, 0x55, 0x2C, 0xEB, 0x39, 0xB1, 0x3E, 0xEB, 0x39, 0x54, 0x2C, 0xFD, 0x17, 0x00, 0x00,
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0x02, 0xE8, 0xAC, 0xD3, 0x14, 0xC6, 0x4F, 0xC1, 0x15, 0xC6, 0xAB, 0xD3, 0x02, 0xE8, 0x01,
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0x00, 0xFD, 0x17, 0x55, 0x2C, 0xEB, 0x39, 0xB1, 0x3E, 0xEB, 0x39, 0x54, 0x2C, 0xFD, 0x17,
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0x00, 0x00, 0x02, 0xE8, 0xAB, 0xD3, 0x14, 0xC6, 0x50, 0xC1, 0x15, 0xC6, 0xAB, 0xD3, 0x02,
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0xE8, 0x00, 0x00, 0xFD, 0x17, 0x55, 0x2C, 0xEB, 0x39, 0xB1, 0x3E, 0xEC, 0x39, 0x54, 0x2C,
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0xFE, 0x17, 0x00, 0x00, 0x02, 0xE8, 0xAB, 0xD3, 0x15, 0xC6, 0x4F, 0xC1, 0x14, 0xC6, 0xAC,
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0xD3, 0x03, 0xE8, 0x00, 0x00, 0xFD, 0x17, 0x54, 0x2C, 0xEC, 0x39, 0xB2, 0x3E, 0xEB, 0x39,
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0x54, 0x2C, 0xFE, 0x17, 0x00, 0x00, 0x02, 0xE8, 0xAB, 0xD3, 0x15, 0xC6, 0x4F, 0xC1, 0x14,
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0xC6, 0xAB, 0xD3, 0x03, 0xE8,
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};
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static void tx_done(const struct device *dev, void *user_data)
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{
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if (!loopback) {
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audio_codec_write(dev, audio_data_p, AUDIO_BLOCK_SIZE);
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audio_data_p += AUDIO_BLOCK_SIZE;
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if ((audio_data_p - pcm_16k) >= sizeof(pcm_16k)) {
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audio_data_p = pcm_16k;
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}
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}
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}
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void rx_done(const struct device *dev, uint8_t *buf, uint32_t len, void *user_data)
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{
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if (loopback) {
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audio_codec_write(dev, buf, 320);
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}
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}
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int main(void)
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{
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static const struct device *dev;
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struct audio_codec_cfg cfg = {
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.dai_type = AUDIO_DAI_TYPE_PCM,
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.dai_cfg.pcm.dir = AUDIO_DAI_DIR_TX,
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.dai_cfg.pcm.pcm_width = AUDIO_PCM_WIDTH_16_BITS,
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.dai_cfg.pcm.channels = 1,
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.dai_cfg.pcm.block_size = AUDIO_BLOCK_SIZE,
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.dai_cfg.pcm.samplerate = AUDIO_PCM_RATE_16K,
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};
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#if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(audcodec))
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dev = DEVICE_DT_GET(DT_NODELABEL(audcodec));
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#else
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printk("No audio codec on this board. Skipping audio test.\n");
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return 0;
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#endif
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if (!device_is_ready(dev)) {
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printk("codec device is not ready\n");
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return -EBUSY;
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}
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printk("codec device is ready\n");
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k_sleep(K_MSEC(1000));
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printk("codec playback and capture example on %s\n", CONFIG_BOARD_TARGET);
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while (1) {
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audio_property_value_t val;
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loopback = false;
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audio_data_p = pcm_16k;
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audio_codec_configure(dev, &cfg);
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audio_codec_register_done_callback(dev, tx_done, NULL, rx_done, NULL);
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printk("codec tansfer start\n");
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audio_codec_start(dev, AUDIO_DAI_DIR_TX);
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val.vol = SPEAKER_VOL;
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audio_codec_set_property(dev, AUDIO_PROPERTY_OUTPUT_VOLUME, 0, val);
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printk("codec tansfer started\n");
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k_sleep(K_MSEC(15000));
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audio_codec_stop(dev, AUDIO_DAI_DIR_TX);
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printk("codec tansfer stopped\n");
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printk("codec loopback\n");
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loopback = true;
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audio_data_p = pcm_16k;
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cfg.dai_cfg.pcm.dir = AUDIO_DAI_DIR_TXRX;
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audio_codec_configure(dev, &cfg);
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audio_codec_start(dev, AUDIO_DAI_DIR_TXRX);
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audio_codec_set_property(dev, AUDIO_PROPERTY_OUTPUT_VOLUME, 0, val);
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k_sleep(K_MSEC(15000));
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audio_codec_stop(dev, AUDIO_DAI_DIR_TXRX);
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printk("example completed\n");
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}
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return 0;
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}

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