2

我正在尝试从Beaglebone AI 中的圆形麦克风板 ( TIDA-01454 ) 捕获声音。我已经通过 I2C 成功配置了 CMB 的 ADC，并检查了 I2S 输出与外部 DAC 是否正常工作。

然而，我的下一步是将这个 I2S 捕获到我的 Beaglebone AI 中，以便以后进行处理。我想我已经按照本指南和本文档正确配置了引脚。所以我的显示引脚是这样的：

sudo 显示引脚

我的 DTS 文件是这样的：

#include "am5729-beagleboneai.dts"  
// make it easy to determine which dtb you're currently running on  
// (via /proc/device-tree/chosen/)  
/ {  
 chosen {  
  base_dtb = "am5729-beagleboneai-custom.dts";  
  base_dtb_timestamp = __TIMESTAMP__;  
 };  
};  
// eventually these should be available in a header  
#define P9_14  (0x3400 + 4 * 107)  
#define P9_16  (0x3400 + 4 * 108)  
#define P9_19a (0x3400 + 4 * 16)  
#define P9_19b (0x3400 + 4 * 95)  
#define P9_20a (0x3400 + 4 * 17)  
#define P9_20b (0x3400 + 4 * 94)  
#define P9_12  (0x3400 + 4 * 171) 
#define P9_27b (0x3400 + 4 * 172)
#define P9_18b (0x3400 + 4 * 173)
// 
/{

pcm5102a: pcm5102a {
   #sound-dai-cells = <0>;
   compatible = "ti,pcm5102a";
   status = "okay";
};


sound {compatible = "simple-audio-card";
        simple-audio-card,format = "i2s";
        simple-audio-card,name = "PCM5102a";
        simple-audio-card,bitclock-master = <&sound1_master>;
        simple-audio-card,frame-master = <&sound1_master>;
        simple-audio-card,bitclock-inversion;
        
        
        simple-audio-card,cpu {
                sound-dai = <&mcasp1>;
        };
        sound1_master: simple-audio-card,codec {
            #sound-dai-cells = <0>;
            sound-dai = <&pcm5102a>;
            
        };
      };
};

// enable i2c-3 on P9.19 (scl) + P9.20 (sda)  
&i2c4 {  
 status = "okay";  
 clock-frequency = <400000>;  
 pinctrl-names = "default";  
 pinctrl-0 = <&i2c4_pins>;  

};

&mcasp1 {
    #sound-dai-cells = <0>;
    status = "okay";
    pinctrl-names = "default";  
    pinctrl-0 = <&mcasp1_pins>;  
    op-mode = <0>;    /* MCASP_IIS_MODE */
    tdm-slots = <2>;
    num-serializer = <4>;
    /* 16 serializers */
    serial-dir = < /* 1 TX 2 RX 0 unused */
             2 0 0 0
        >;
    rx-num-evt = <1>;
    tx-num-evt = <1>;
};  




&dra7_pmx_core {  
 i2c4_pins: i2c4 {  
  pinctrl-single,pins = <  
   DRA7XX_CORE_IOPAD( P9_19a, PIN_INPUT_PULLUP | MUX_MODE7  )  // scl  
   DRA7XX_CORE_IOPAD( P9_19b, PIN_INPUT_PULLUP | MUX_MODE14 )  // (shared pin)  
   DRA7XX_CORE_IOPAD( P9_20a, PIN_INPUT_PULLUP | MUX_MODE7  )  // sda  
   DRA7XX_CORE_IOPAD( P9_20b, PIN_INPUT_PULLUP | MUX_MODE14 )  // (shared pin)  
  >;  
 };
 mcasp1_pins: mcasp1_pins {
  pinctrl-single,pins = <
   DRA7XX_CORE_IOPAD(P9_12, PIN_INPUT_PULLDOWN | MUX_MODE0) // 12 0  mcasp1_aclkr  BIT CLOCK      BCLK
   DRA7XX_CORE_IOPAD(P9_27b, PIN_INPUT | MUX_MODE0) // 27b 0  mcasp1_fsr    FRAME SYNC            LRCLK
   DRA7XX_CORE_IOPAD(P9_18b, PIN_INPUT | MUX_MODE0) // 18b 0  mcasp1_axr0   I2S INPUT             DATA
  >;
 };  
};  
// enable pwm-2 on P9.14 (out-A) + P9.16 (out-B)  
&epwmss2 {  
 status = "okay";  
};  
&ehrpwm2 {  
 status = "okay";  
 pinctrl-names = "default";  
 pinctrl-0 = <&ehrpwm2_pins>;  
};  
&dra7_pmx_core {  
 ehrpwm2_pins: ehrpwm2 {  
  pinctrl-single,pins = <  
   DRA7XX_CORE_IOPAD( P9_14, PIN_OUTPUT_PULLDOWN | MUX_MODE10 )  // out A  
   DRA7XX_CORE_IOPAD( P9_16, PIN_OUTPUT_PULLDOWN | MUX_MODE10 )  // out B  
  >;  
 };  
};

但是我认为它不会将其检测为捕获设备。由于 grep 和 arecord 命令返回以下内容：

debian@beaglebone:/var/lib/cloud9$ dmesg |grep sound                                                      
[    1.385258] asoc-simple-card sound: pcm5102a-hifi <-> 48460000.mcasp mapping ok
debian@beaglebone:/var/lib/cloud9$ arecord -l
**** List of CAPTURE Hardware Devices ****
debian@beaglebone:/var/lib/cloud9$

我认为 ALSA 配置可能存在问题，但我是新手，我不知道该怎么做。

我的 ALSA 版本是：Advanced Linux Sound Architecture Driver Version k4.14.108-ti-r143.

我的声卡是：

cat /proc/asound/cards
 0 [Black          ]: TI_BeagleBone_B - TI BeagleBone Black
                      TI BeagleBone Black

所以没有检测到卡？是ALSA还是驱动问题？我该怎么做？

4

0 回答 0