请问为什么am335x音频没有声音？

本帖最后由 一只耳朵怪 于 2018-6-21 15:25 编辑

各位好，
    我们自己做的板子，tlv320aic3106，电路与SK板子一样，也是用mcasp1和i2c0，能够找到设备
[    1.538127] _regulator_get: 1-001b supply IOVDD not found, using dummy regulr
[    1.545952] _regulator_get: 1-001b supply DVDD not found, using dummy regular
[    1.553637] _regulator_get: 1-001b supply AVDD not found, using dummy regular
[    1.561324] _regulator_get: 1-001b supply DRVDD not found, using dummy regulr                                   
[    1.598634] asoc: tlv320aic3x-hifi <-> davinci-mcasp.1 mapping ok            
[    1.606207] ALSA device list:                                                
[    1.609321]   #0: AM335X EVM

这是配置，没有改动
board-am335xevm.c:
static void mcasp1_init(int evm_id, int profile)
[
    /* Configure McASP */
    setup_pin_mux(mcasp1_pin_mux);

    am335x_register_mcasp(&am335x_evm_sk_snd_data1, 1);

    return;
]
static struct pinmux_config mcasp1_pin_mux[] = [
    ["mii1_crs.mcasp1_aclkx", OMAP_MUX_MODE4 | AM33XX_PIN_INPUT_PULLDOWN],
    ["mii1_rxerr.mcasp1_fsx", OMAP_MUX_MODE4 | AM33XX_PIN_INPUT_PULLDOWN],
    ["mii1_col.mcasp1_axr2", OMAP_MUX_MODE4 | AM33XX_PIN_INPUT_PULLDOWN],
    ["rmii1_refclk.mcasp1_axr3", OMAP_MUX_MODE4 | AM33XX_PIN_INPUT_PULLDOWN],
    [NULL, 0],
];
static u8 am335x_evm_sk_iis_serializer_direction1[] = [
    INACTIVE_MODE,    INACTIVE_MODE,    TX_MODE,    INACTIVE_MODE,
    INACTIVE_MODE,    INACTIVE_MODE,    INACTIVE_MODE,    INACTIVE_MODE,
    INACTIVE_MODE,    INACTIVE_MODE,    INACTIVE_MODE,    INACTIVE_MODE,
    INACTIVE_MODE,    INACTIVE_MODE,    INACTIVE_MODE,    INACTIVE_MODE,
];

static struct snd_platform_data am335x_evm_sk_snd_data1 = [
    .tx_dma_offset    = 0x46400000,    /* McASP1 */
    .op_mode    = DAVINCI_MCASP_IIS_MODE,
    .num_serializer    = ARRAY_SIZE(am335x_evm_sk_iis_serializer_direction1),
    .tdm_slots    = 2,
    .serial_dir    = am335x_evm_sk_iis_serializer_direction1,
    .asp_chan_q    = EVENTQ_2,
    .version    = MCASP_VERSION_3,
    .txnumevt    = 32,
    .get_context_loss_count    =    omap_pm_get_dev_context_loss_count,
];

    [
        I2C_BOARD_INFO("tlv320aic3x", 0x1b),
    ],

davinci-evm.c:
static struct snd_soc_dai_link am335x_evm_sk_dai = [
    .name = "TLV320AIC3X",
    .stream_name = "AIC3X",
    .cpu_dai_name = "davinci-mcasp.1",
    .codec_dai_name = "tlv320aic3x-hifi",
    .codec_name = "tlv320aic3x-codec.1-001b",
    .platform_name = "davinci-pcm-audio",
    .init = evm_aic3x_init,
    .ops = &evm_ops,
];
# aplay Noise.wav
Playing WAVE 'audiodump.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
播放wav文件的时候没有声音，但是添加的打印信息也没有报错，用示波器看到MCLK为24MHz，WCLK为48KHz，BCLK为1.5395MHz，耳机输出口有电平变化，但是没有波形，是不是没有输出啊？请大家指点一下