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【Linux驱动开发】鲁班猫1音频I2S3-MAX98357A

  • 2026-07-02 16:31:16
【Linux驱动开发】鲁班猫1音频I2S3-MAX98357A

开发环境

  • 开发机:Ubuntu 20.04
  • 开发板:鲁班猫1 
    • SOC:RK3566
  • Linux SDK:LubanCat_Linux_rk356x_SDK_20260418

开发环境配置

安装ssh

sudo apt install openssh-server -y

安装依赖

sudo apt install git ssh make gcc libssl-dev liblz4-tool u-boot-tools curl \expect g++ patchelf chrpath gawk texinfo chrpath diffstat binfmt-support \qemu-user-static live-build bison flex fakeroot cmake gcc-multilib g++-multilib \unzip device-tree-compiler python3-pip libncurses5-dev python3-pyelftools dpkg-devsudo apt install gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu

安装repo

mkdir ~/bincurl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repochmod a+x ~/bin/repoecho PATH=~/bin:$PATH >> ~/.bashrcsource ~/.bashrcrepo --version

切换默认python版本

sudo ln -sf /usr/bin/python3 /usr/bin/python

Git配置

git config --global user.name "your name"git config --global user.email "your mail"

系统编译

加载SDK代码

mkdir ~/LubanCat_SDKmv LubanCat_Linux_rk356x_SDK_20260418.tar  LubanCat_SDK/cd ~/LubanCat_SDKtar -xvf LubanCat_Linux_rk356x_SDK_20260418.tarrm -rf LubanCat_Linux_rk356x_SDK_20260418.tar.repo/repo/repo sync -l

构建Linux版本

./build.sh lunchWhich would you like? [0]: 5sudo dpkg -i ubuntu/ubuntu-build-service/packages/*sudo apt-get install -f./build.sh

编译产物位于rockdev/目录下update.img 使用RKDevTools烧录即可。

让ssh支持root登录

sudo sh -c 'echo "PermitRootLogin yes" >> /etc/ssh/sshd_config'sudo systemctl restart sshd

I2S3声卡驱动

I2S3设备树

创建文件LubanCat_SDK\kernel\arch\arm64\boot\dts\rockchip\overlay\i2s3-max98357a-overlay.dts

/dts-v1/;/plugin/;/ {    compatible = "rockchip,rk3568"    fragment@0 {        target = <&i2s3_2ch>;         __overlay__ {            status = "okay"            pinctrl-names = "default";            pinctrl-0 = <&i2s3m1_sclk                    &i2s3m1_lrck                    &i2s3m1_sdi                    &i2s3m1_sdo>;        };    };    fragment@1 {        target-path = "/";        __overlay__ {            dummy_codec: dummy-codec {                compatible = "rockchip,dummy-codec";                #sound-dai-cells = <0>;                status = "okay";            };        };    };    fragment@2 {        target-path = "/";        __overlay__ {            i2s3_sound_card: i2s3-sound-card {                status = "okay";                compatible = "simple-audio-card";                simple-audio-card,name = "I2S3 Dummy Sound Card";                simple-audio-card,format = "i2s";                simple-audio-card,mclk-fs = <256>;                simple-audio-card,cpu {                    sound-dai = <&i2s3_2ch>;                };                simple-audio-card,codec {                    sound-dai = <&dummy_codec>;                };            };        };    };};

物理连线(RK2566 --> MAX98357A):

  • I2S3_LRCK_M1 --> LRCLK
  • I2S3_SCLK_M1 --> BCLK
  • I2S3_SDO_M1 --> SDO
  • 3.3V --> SD_MODE
  • 5V --> Vin
  • GND --> GND

编译设备树

LubanCat_SDK\kernel\中执行:

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- lubancat2_defconfigmake ARCH=arm64 -j4 CROSS_COMPILE=aarch64-linux-gnu- dtbs

把生成的~/LubanCat_SDK/kernel/arch/arm64/boot/dts/rockchip/overlay/i2s3-max98357a-overlay.dtbo推到开发板的/boot/dtb/overlay/下。 然后在/boot/uEnv/uEnvLubanCat1.txt添加:

dtoverlay=/dtb/overlay/i2s3-max98357a-overlay.dtbo

重启。

I2S3声卡测试

root@lubancat:~# aplay -l**** List of PLAYBACK Hardware Devices ****card 0Card [I2S3 Dummy Sound Card], device 0: fe430000.i2s-dummy_codec dummy-codec-0 [fe430000.i2s-dummy_codec dummy-codec-0]  Subdevices1/1  Subdevice #0: subdevice #0card 1: rockchiphdmi [rockchip,hdmi], device 0: fe400000.i2s-i2s-hifi i2s-hifi-0 [fe400000.i2s-i2s-hifi i2s-hifi-0]  Subdevices1/1  Subdevice #0: subdevice #0card 2: rockchiprk809co [rockchip,rk809-codec], device 0: fe410000.i2s-rk817-hifi rk817-hifi-0 [fe410000.i2s-rk817-hifi rk817-hifi-0]  Subdevices1/1  Subdevice #0: subdevice #0

可以看到I2S3声卡注册成功了,使用下面的命令播放测试:

speaker-test -t sine -f 500 -D hw:0,0 -c 2speaker-test -t wav -D hw:0,0 -c 2

正常能够听到左声道声音,但是起播和停播会有爆破音,这是由于SD_MODE一直高电平,不播放的时候应该拉低静音,我们需要使用MAX98357A驱动来控制SD_MODE。

MAX98357A驱动

设备树修改

修改i2s3-max98357a-overlay.dts

/dts-v1/;/plugin/;#include<dt-bindings/gpio/gpio.h>#include<dt-bindings/pinctrl/rockchip.h>/ {    // 鲁班猫1(RK3566)的兼容型号    compatible = "rockchip,rk3568"    // 片段0:启用 I2S3 控制器    fragment@0 {        target = <&i2s3_2ch>;         __overlay__ {            status = "okay"            // 配置引脚复用。请根据实际接线确认是 M0 还是 M1 组引脚            pinctrl-names = "default";            pinctrl-0 = <&i2s3m1_sclk                    &i2s3m1_lrck                    &i2s3m1_sdi                    &i2s3m1_sdo>;        };    };    // 片段1:创建 max98357a Codec 节点    fragment@1 {        target-path = "/"// 在根节点下添加        __overlay__ {            max98357a: max98357a {                compatible = "maxim,max98357a";                #sound-dai-cells = <0>;                sdmode-gpios = <&gpio1 RK_PB2 GPIO_ACTIVE_HIGH>;                status = "okay";            };        };    };    // 片段2:添加 simple-audio-card 进行绑定    fragment@2 {        target-path = "/"// 在根节点下添加声卡节点        __overlay__ {            i2s3_sound_card: i2s3-sound-card {                status = "okay";                compatible = "simple-audio-card"// 声明使用通用声卡驱动框架                simple-audio-card,name = "I2S3 MAX98357A Sound Card"// 声卡名称                simple-audio-card,format = "i2s"// 音频数据格式                simple-audio-card,mclk-fs = <256>;                // 绑定 CPU 侧:指向片段0启用的 I2S3 控制器                simple-audio-card,cpu {                    sound-dai = <&i2s3_2ch>;                };                // 绑定 Codec 侧:指向片段1定义的 max98357a 节点                simple-audio-card,codec {                    sound-dai = <&max98357a>;                };            };        };    };};

MAX98357A驱动

LubanCat_SDK\kernel\sound\soc\codecs\Makefile添加:

obj-m	+= snd-soc-max98357a.o

编译驱动

LubanCat_SDK\kernel\中执行:

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- lubancat2_defconfigmake ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- M=sound/soc/codecs modules

LubanCat_SDK/kernel/sound/soc/codecs/snd-soc-max98357a.ko推送到开发板的/root/下,然后在/root/下执行:

insmod snd-soc-max98357a.ko

再次测试,现在播放正常了。

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  1. CONNECT:[ UseTime:0.000991s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001388s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000704s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000640s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001477s ]
  6. SELECT * FROM `set` [ RunTime:0.000611s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001487s ]
  8. SELECT * FROM `article` WHERE `id` = 502746 LIMIT 1 [ RunTime:0.007666s ]
  9. UPDATE `article` SET `lasttime` = 1783006347 WHERE `id` = 502746 [ RunTime:0.014746s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000607s ]
  11. SELECT * FROM `article` WHERE `id` < 502746 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001112s ]
  12. SELECT * FROM `article` WHERE `id` > 502746 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.024829s ]
  13. SELECT * FROM `article` WHERE `id` < 502746 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.056275s ]
  14. SELECT * FROM `article` WHERE `id` < 502746 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.069489s ]
  15. SELECT * FROM `article` WHERE `id` < 502746 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003557s ]
0.351420s