音频

1. 简介

Omni3576 开发板音频部分采用的是 ES8388 驱动芯片，ES8388 是一款高性能、低功耗且低成本的音频编解码器。它包含2通道ADC、2通道DAC、麦克风放大器、耳机放大器、数字音效以及模拟混音和增益功能。

2. 声音配置

查看声卡设备

luckfox@luckfox:~$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: rockchipes8388 [rockchip-es8388], device 0: dailink-multicodecs ES8323 HiFi-0 [dailink-multicodecs ES8323 HiFi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
  
luckfox@luckfox:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: rockchipes8388 [rockchip-es8388], device 0: dailink-multicodecs ES8323 HiFi-0 [dailink-multicodecs ES8323 HiFi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: rockchipdp0 [rockchip-dp0], device 0: rockchip-dp0 spdif-hifi-0 [rockchip-dp0 spdif-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

声卡的驱动目录
```
luckfox@luckfox:~$ ls /dev/snd/
by-path  controlC0  controlC1  pcmC0D0c  pcmC0D0p  pcmC1D0p  seq  timer
```
- controlC0和 controlC1：用于声卡控制，C0 表示声卡 0，C1 表示声卡 1，对应上文的SOC自带的声音输出
- pcmC0D0c：用于录音的 pcm 设备，最后面的“c”是 capture 的缩写，表示录音设备
- pcmC0D0p和pcmC1D0p：用于播放的 pcm 设备，最后面的“p”是 playback 的缩写，表示播放设备
```
luckfox@luckfox:~$  ls -l /dev/snd/by-path/
total 0
lrwxrwxrwx 1 root root 12 Oct 18 10:03 platform-dp0-sound -> ../controlC1
lrwxrwxrwx 1 root root 12 Oct 18 10:03 platform-es8388-sound -> ../controlC0
```

3. 测试

录音测试

arecord -Dhw:0,0  -f cd -r 44100 -c 2 -t wav test.wav 

耳机测试（插上耳机会自动切换输入输出通道）

设置录音增益：
tinymix -D 0 set "Left Channel Capture Volume" 8
tinymix -D 0 set "Right Channel Capture Volume" 8
设置播放音量：
tinymix -D 0 set "Output 1 Playback Volume" 33 33
tinymix -D 0 set "Output 2 Playback Volume" 33 33
播放：
aplay -Dhw:0,0 -t wav /userdata/test.wav
录音：
arecord -Dhw:0,0  -f cd -r 44100 -c 2 -t wav /userdata/test.wav

播放测试

aplay -Dhw:0,0 -t wav /userdata/test.wav

4. 设备树简介

Audio DTS 源文件在kernel-6.10/arch/arm64/boot/dts/rockchip/luckfox-omni3576-codec.dtsi已经定义，我们可以直接调用。

/ {
    es8388_sound: es8388-sound {
                status = "okay";
                compatible = "rockchip,multicodecs-card";
                rockchip,card-name = "rockchip-es8388";
                rockchip,format = "i2s";
                rockchip,mclk-fs = <256>;
                rockchip,cpu = <&sai1>;
                rockchip,codec = <&es8388>;
                rockchip,audio-routing =
                        "Headphone", "LOUT1",
                        "Headphone", "ROUT1",
                        "Speaker", "LOUT1",
                        "Speaker", "ROUT1",
                        "LINPUT2", "Main Mic",
                        "RINPUT2", "Main Mic",
                        "LINPUT2", "Headset Mic",
                        "RINPUT2", "Headset Mic";
        };
};

&i2c2 {
        status = "okay";

        es8388: es8388@10 {
                status = "okay";
                #sound-dai-cells = <0>;
                compatible = "everest,es8388", "everest,es8323";
                reg = <0x10>;
                clocks = <&mclkout_sai1>;
                clock-names = "mclk";
                assigned-clocks = <&mclkout_sai1>;
                assigned-clock-rates = <12288000>;
                pinctrl-names = "default";
                pinctrl-0 = <&sai1m0_mclk>;
        };
};


&sai1 {
        status = "okay";
        pinctrl-names = "default";
        pinctrl-0 = <&sai1m0_lrck
                     &sai1m0_sclk
                     &sai1m0_sdi0
                     &sai1m0_sdo0>;
};

1. 简介​

2. 声音配置​

3. 测试​

4. 设备树简介​

1. 简介

2. 声音配置

3. 测试

4. 设备树简介