瑞芯微RK3506核心板/开发板DSM音频开发实战，关键知识点与实操案例必看攻略！

dsm_sound: dsm-sound {

                status = "okay";

                compatible = "simple-audio-card";

                simple-audio-card,format = "i2s";

                simple-audio-card,mclk-fs = <256>;

                simple-audio-card,name = "rockchip,dsm-sound";

                simple-audio-card,bitclock-master = <&sndcodec>;

                simple-audio-card,frame-master = <&sndcodec>;

                sndcpu: simple-audio-card,cpu {

                        sound-dai = <&sai3>;

                };

                sndcodec: simple-audio-card,codec {

                        sound-dai = <&acdcdig_dsm>;

                };

        };

&acdcdig_dsm {

        status = "okay";

};

&sai3 {

        status = "okay";

};

&audio_codec {

        status = "okay";

};

2.触觉智能RK3506开发板(EVB3506)的es8388声卡与DSM复用，所以配置DSM功能前需先关闭es8388相关配置。

 es8388_sound: es8388-sound {

                status = "disabled";

                compatible = "rockchip,multicodecs-card";

                rockchip,card-name = "rockchip-es8388";

                spk-con-gpio = <&gpio0 RK_PB6 GPIO_ACTIVE_HIGH>;

                rockchip,pre-power-on-delay-ms = <30>;

                rockchip,post-power-down-delay-ms = <40>;

                rockchip,format = "i2s";

                rockchip,mclk-fs = <256>;

                rockchip,cpu = <&sai1>;

                rockchip,codec = <&es8388>;

                rockchip,audio-routing =

                        "Headphone", "LOUT1",

                        "Headphone", "ROUT1",

                        "Speaker", "LOUT2",

                        "Speaker", "ROUT2",

                        "Headphone", "Headphone Power",

                        "Headphone", "Headphone Power",

                        "Speaker", "Speaker Power",

                        "Speaker", "Speaker Power",

                        "RINPUT1", "Main Mic",

                        "RINPUT2", "Main Mic",

                        "LINPUT1", "Headset Mic",

                        "LINPUT2", "Headset Mic";

                pinctrl-names = "default";

                pinctrl-0 = <&spk_ctrl>;

        };

&i2c0 {

        status = "okay";

        pinctrl-names = "default";

        pinctrl-0 = <&rm_io0_i2c0_scl

                     &rm_io1_i2c0_sda>;

        es8388: es8388@11 {

                status = "disabled";

#sound

-dai-cells = <0>;

                compatible = "everest,es8388", "everest,es8323";

                reg = <0x11>;

                clocks = <&mclkout_sai1>;

                clock-names = "mclk";

                assigned-clocks = <&mclkout_sai1>;

                assigned-clock-rates = <12288000>;

                pinctrl-names = "default";

                pinctrl-0 = <&rm_io8_sai1_mclk>;

        };

};

root@rk3506-buildroot:/# aplay -l  

**** List of PLAYBACK Hardware Devices ****

card 1: rockchipdsmsoun [rockchip,dsm-sound], device 0: ff4a0000.sai-rk_dsm rk_dsm-0 [ff4a0000.sai-rk_dsm rk_dsm-0]

  Subdevices: 1/1

  Subdevice 

#0

: subdevice 

#0

root@rk3506-buildroot:/# 

• 配置功放芯片，将功放芯片开关脚拉高，命令如下：

  
  

  root@rk3506-buildroot:/root# echo 14 > /sys/class/gpio/export 

  root@rk3506-buildroot:/root# echo out > /sys/class/gpio/gpio14/direction   

  root@rk3506-buildroot:/root# echo 255 > /sys/class/gpio/gpio14/value 

          root@rk3506-buildroot:/# aplay  -Dhw:1,0 1KHZ.wav

          Playing WAVE '1KHZ.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo