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0076_PCM5122.md

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PCM5122

DAI：Digital Audio Interface。DAI是数字音频接口的统称，PCM是其中的一种。

参考文档

PCM Pins

hifiberry

https://www.hifiberry.com/products/

dts overlay

  • cd arch/arm/boot/dts/overlays
  • find * -iname 'hifiberry*.dts' 
    hifiberry-amp-overlay.dts
hifiberry-dac-overlay.dts
hifiberry-digi-overlay.dts
hifiberry-dacplusadc-overlay.dts
hifiberry-dacplus-overlay.dts
hifiberry-digi-pro-overlay.dts
hifiberry-dacplusadcpro-overlay.dts
  • arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts 
    // Definitions for HiFiBerry DAC+
/dts-v1/;
/plugin/;

/ {
        compatible = "brcm,bcm2835";

        fragment@0 {
                target-path = "/clocks";
                __overlay__ {
                        dacpro_osc: dacpro_osc {
                                compatible = "hifiberry,dacpro-clk";
                                #clock-cells = <0>;
                        };
                };
        };

        fragment@1 {
                target = <&i2s>;
                __overlay__ {
                        status = "okay";
                };
        };

        fragment@2 {
                target = <&i2c1>;
                __overlay__ {
                        #address-cells = <1>;
                        #size-cells = <0>;
                        status = "okay";

                        pcm5122@4d {
                                #sound-dai-cells = <0>;
                                compatible = "ti,pcm5122";
                                reg = <0x4d>;
                                clocks = <&dacpro_osc>;
                                AVDD-supply = <&vdd_3v3_reg>;
                                DVDD-supply = <&vdd_3v3_reg>;
                                CPVDD-supply = <&vdd_3v3_reg>;
                                status = "okay";
                        };
                };
        };

        fragment@3 {
                target = <&sound>;
                hifiberry_dacplus: __overlay__ {
                        compatible = "hifiberry,hifiberry-dacplus";
                        i2s-controller = <&i2s>;
                        status = "okay";
                };
        };

        __overrides__ {
                24db_digital_gain =
                        <&hifiberry_dacplus>,"hifiberry,24db_digital_gain?";
                slave = <&hifiberry_dacplus>,"hifiberry-dacplus,slave?";
        };
};
  • sound/soc/codecs/
    • sound/soc/codecs/pcm512x-i2c.c
    • sound/soc/codecs/pcm512x.c
  • /boot/config.txt 
    dtoverlay=hifiberry-dacplus
  • dmesg 
    [...省略]
[   38.482491] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   38.482503] Bluetooth: BNEP filters: protocol multicast
[   38.482525] Bluetooth: BNEP socket layer initialized
[   43.128046] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[   43.135823] Bridge firewalling registered
[   44.098052] IPv6: ADDRCONF(NETDEV_UP): docker0: link is not ready
[   77.932173] fuse init (API version 7.27)
[   89.672945] pcm512x 1-004d: No SCLK, using BCLK: -2
[   89.676808] pcm512x 1-004d: No SCLK, using BCLK: -2
[   89.679951] pcm512x 1-004d: No SCLK, using BCLK: -2
[   89.683422] pcm512x 1-004d: No SCLK, using BCLK: -2
[   89.741234] pcm512x 1-004d: No SCLK, using BCLK: -2
[   89.760936] pcm512x 1-004d: No SCLK, using BCLK: -2
[   89.782787] pcm512x 1-004d: No SCLK, using BCLK: -2
[ 5642.988416] pcm512x 1-004d: No SCLK, using BCLK: -2
[ 5834.861250] pcm512x 1-004d: No SCLK, using BCLK: -2
  • sound/soc/codecs/pcm512x.c 
    static int pcm512x_dai_startup_slave(struct snd_pcm_substream *substream,
                                     struct snd_soc_dai *dai)
{
        struct snd_soc_component *component = dai->component;
        struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
        struct device *dev = dai->dev;
        struct regmap *regmap = pcm512x->regmap;

        if (IS_ERR(pcm512x->sclk)) {
                dev_info(dev, "No SCLK, using BCLK: %ld\n",
                         PTR_ERR(pcm512x->sclk));

                /* Disable reporting of missing SCLK as an error */
                regmap_update_bits(regmap, PCM512x_ERROR_DETECT,
                                   PCM512x_IDCH, PCM512x_IDCH);

                /* Switch PLL input to BCLK */
                regmap_update_bits(regmap, PCM512x_PLL_REF,
                                   PCM512x_SREF, PCM512x_SREF_BCK);
        }

        return snd_pcm_hw_constraint_list(substream->runtime, 0,
                                          SNDRV_PCM_HW_PARAM_RATE,
                                          &constraints_slave);
}

aplay test

  • lsmod | grep i2s 
    snd_soc_bcm2835_i2s    16384  2
snd_soc_core          188416  3 snd_soc_pcm512x,snd_soc_hifiberry_dacplus,snd_soc_bcm2835_i2s
snd_pcm                98304  6 snd_soc_pcm512x,snd_pcm_dmaengine,snd_soc_hifiberry_dacplus,snd_soc_bcm2835_i2s,snd_bcm2835,snd_soc_core
  • lsmod | grep pcm512x 
    snd_soc_pcm512x_i2c    16384  1
snd_soc_pcm512x        32768  1 snd_soc_pcm512x_i2c
snd_soc_core          188416  3 snd_soc_pcm512x,snd_soc_hifiberry_dacplus,snd_soc_bcm2835_i2s
snd_pcm                98304  6 snd_soc_pcm512x,snd_pcm_dmaengine,snd_soc_hifiberry_dacplus,snd_soc_bcm2835_i2s,snd_bcm2835,snd_soc_core
snd                    73728  16 snd_compress,snd_soc_pcm512x,snd_timer,snd_bcm2835,snd_soc_core,snd_pcm
  • wav_Sound_Generator.md
    • aplay -Dhw:1,0 sound.wav

config

  • usr/share/alsa/alsa.conf
  • ~/.asoundrc