STM32和WM8960 I2S 利用DMA双缓冲音频播放和录音（二）

前面简单讲解了WM8960语音芯片工作方式，WM8960做master，之前参数配置ADC/DAC采样速率的是44.1K，有点问题，现在改为16K，下面会解释为什么要改成16K。

WM8960参数配置如下：注意录音时关掉内部路径，否则会有杂音。

#ifdef ALOOPBACK   //先关掉内部路径播放
    0x2d,0x080, //Left Input Boost Mixer to Left Output Mixer
    0x2e,0x080, //Right Input Boost Mixer to Right Output Mixer
    #endif

 

//WM8960 slave mode
// MCLK = 24MHz, SYSCLK = 12.288MHz, 
// PLL mode is fractional, MCLK div 2
const u16 wm8960_reg_master[]=
{
    0x0f,0x000,
    0x19,0x17e,
    0x1a,0x1e1,
    0x2f,0x03c,
    
    0x34,0x038,
    0x35,0x031,
    0x36,0x026,
    0x37,0x0e6,
    
    0x04,0x0dd,  //ADC/DAC 采样速率12.288/(3*256) = 16KHz
    0x08,0x00c,
    0x20,0x138,
    0x21,0x138,
    0x2b,0x000,
    0x2c,0x000,
    0x00,0x157,
    0x01,0x157,
    0x05,0x000,
    0x06,0x000,
    0x07,0x042, //bit6=1, Enable master mode; bit[1:0]=10,I2S Format;bit[3:2]=00,16 bits
    0x18,0x004,
    0x30,0x000,
    
    0x02,0x163,//179,// //LOUT1 Volume
    0x03,0x163,//0x179,//ROUT1 Volume
    

    #ifdef DLOOPBACK  //不开LOOPBACK
    0x09,0x001,
    #endif

    0x22,0x100,  //Enable Left DAC to Left Output Mixer
    0x25,0x100,    //Enable Right DAC to Right Output Mixer 

    #ifdef ALOOPBACK   //先关掉内部路径播放
    0x2d,0x080, //Left Input Boost Mixer to Left Output Mixer
    0x2e,0x080, //Right Input Boost Mixer to Right Output Mixer
    #endif
};

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