DSP5509项目之用FFT识别钢琴音调（2）

1. 本节主要是学习TLV320AIC32这个音频芯片，Easy5509 开发板上有一个语音编解码芯片 TLV320AIC23。TLV320AIC23 是一个高性能的多媒体数字语音编解码器，它的内部 ADC 和 DAC 转换模块带有完整的数字滤波器。（digital interpolation filters）数据传输宽度可以是 16 位，20 位，24 位和 32 位，采样频率范围支持从 8khz 到 96khz。在 ADC 采集达到 96khz 时噪音为 90-dBA，能够高保真的保存音频信号。在 DAC 转换达到 96khz 时噪音为 100-Dba，能够高品质的数字回放音频，在回放时仅仅减少 23 mW。

2. 第一个问题采集到的钢琴声音然后存储的数据是什么格式？需要进行多少点的FFT运算？

3. 这个芯片支持SPI和I2C接口，那么SPI接口用于进行数据传输，I2C接口用于寄存器配置，DSP5509的多通道缓冲串口MCBSP可以配置成SPI模式。下面的图，分别是LINE IN，麦克风输入，双声道喇叭输出，耳机输出。

4. 一直没搞明白LINE IN 是什么？line-in接口是音频线路输入，例如你可以把其他播放器（复读机等非数字信号的）的声音信号通过line-in内录到电脑中。line-out接口就是最常用的音频线路输出，最普及的应用就是电脑连接音箱。电脑上正常有三种颜色的音频接口，其中绿色的是音频输出接口<line out>（接入音响或者耳机），红色的是麦克疯接口<mic>，蓝色的是音频输入接口<line in>。那么问题是上图的耳机输出和LINE OUT是同一个意思吗？

5. 代码进行了I2C和MCBSP的初始化和配置，

MCBSP_Config Mcbsptest;

/*McBSP set,we use mcbsp1 to send and recieve the data between DSP and AIC23*/
MCBSP_Config Mcbsp1Config = {
  MCBSP_SPCR1_RMK(
    MCBSP_SPCR1_DLB_OFF,                   /* DLB    = 0,禁止自闭环方式 */
    MCBSP_SPCR1_RJUST_LZF,                 /* RJUST  = 2 */
    MCBSP_SPCR1_CLKSTP_DISABLE,            /* CLKSTP = 0 */
    MCBSP_SPCR1_DXENA_ON,                  /* DXENA  = 1 */
    ,                                     /* ABIS   = 0 */
    MCBSP_SPCR1_RINTM_RRDY,                /* RINTM  = 0 */
    ,                                     /* RSYNCER = 0 */
    MCBSP_SPCR1_RRST_DISABLE               /* RRST   = 0 */
   ),
    MCBSP_SPCR2_RMK(
    MCBSP_SPCR2_FREE_NO,                   /* FREE   = 0 */
    MCBSP_SPCR2_SOFT_NO,                   /* SOFT   = 0 */
    MCBSP_SPCR2_FRST_FSG,                  /* FRST   = 0 */
    MCBSP_SPCR2_GRST_CLKG,                 /* GRST   = 0 */
    MCBSP_SPCR2_XINTM_XRDY,                /* XINTM  = 0 */
    ,                                     /* XSYNCER = N/A */
    MCBSP_SPCR2_XRST_DISABLE               /* XRST   = 0 */
   ),
   /*单数据相，接受数据长度为16位,每相2个数据*/
  MCBSP_RCR1_RMK(
      MCBSP_RCR1_RFRLEN1_OF(),              /* RFRLEN1 = 1 */
      MCBSP_RCR1_RWDLEN1_16BIT               /* RWDLEN1 = 2 */
  ),
  MCBSP_RCR2_RMK(
    MCBSP_RCR2_RPHASE_SINGLE,              /* RPHASE  = 0 */
    MCBSP_RCR2_RFRLEN2_OF(),              /* RFRLEN2 = 0 */
    MCBSP_RCR2_RWDLEN2_8BIT,               /* RWDLEN2 = 0 */
    MCBSP_RCR2_RCOMPAND_MSB,               /* RCOMPAND = 0 */
    MCBSP_RCR2_RFIG_YES,                   /* RFIG    = 0 */
    MCBSP_RCR2_RDATDLY_1BIT                /* RDATDLY = 1 */
    ),
   MCBSP_XCR1_RMK(
    MCBSP_XCR1_XFRLEN1_OF(),              /* XFRLEN1 = 1 */
    MCBSP_XCR1_XWDLEN1_16BIT               /* XWDLEN1 = 2 */

 ),
 MCBSP_XCR2_RMK(
    MCBSP_XCR2_XPHASE_SINGLE,              /* XPHASE  = 0 */
    MCBSP_XCR2_XFRLEN2_OF(),              /* XFRLEN2 = 0 */
    MCBSP_XCR2_XWDLEN2_8BIT,               /* XWDLEN2 = 0 */
    MCBSP_XCR2_XCOMPAND_MSB,               /* XCOMPAND = 0 */
    MCBSP_XCR2_XFIG_YES,                   /* XFIG    = 0 */
    MCBSP_XCR2_XDATDLY_1BIT                /* XDATDLY = 1 */
  ),
 MCBSP_SRGR1_DEFAULT,
 MCBSP_SRGR2_DEFAULT,
 MCBSP_MCR1_DEFAULT,
 MCBSP_MCR2_DEFAULT,
 MCBSP_PCR_RMK(
   MCBSP_PCR_IDLEEN_RESET,                 /* IDLEEN   = 0   */
   MCBSP_PCR_XIOEN_SP,                     /* XIOEN    = 0   */
   MCBSP_PCR_RIOEN_SP,                     /* RIOEN    = 0   */
   MCBSP_PCR_FSXM_EXTERNAL,                /* FSXM     = 0   */
   MCBSP_PCR_FSRM_EXTERNAL,                /* FSRM     = 0   */
   ,                                      /* DXSTAT = N/A   */
   MCBSP_PCR_CLKXM_INPUT,                  /* CLKXM    = 0   */
   MCBSP_PCR_CLKRM_INPUT,                  /* CLKRM    = 0   */
   MCBSP_PCR_SCLKME_NO,                    /* SCLKME   = 0   */
   MCBSP_PCR_FSXP_ACTIVEHIGH,              /* FSXP     = 0   */
   MCBSP_PCR_FSRP_ACTIVEHIGH,              /* FSRP     = 1   */
   MCBSP_PCR_CLKXP_FALLING,                /* CLKXP    = 1   */
   MCBSP_PCR_CLKRP_RISING                  /* CLKRP    = 1   */
 ),
 MCBSP_RCERA_DEFAULT,
 MCBSP_RCERB_DEFAULT,
 MCBSP_RCERC_DEFAULT,
 MCBSP_RCERD_DEFAULT,
 MCBSP_RCERE_DEFAULT,
 MCBSP_RCERF_DEFAULT,
 MCBSP_RCERG_DEFAULT,
 MCBSP_RCERH_DEFAULT,
 MCBSP_XCERA_DEFAULT,
 MCBSP_XCERB_DEFAULT,
 MCBSP_XCERC_DEFAULT,
 MCBSP_XCERD_DEFAULT,
 MCBSP_XCERE_DEFAULT,
 MCBSP_XCERF_DEFAULT,
 MCBSP_XCERG_DEFAULT,
 MCBSP_XCERH_DEFAULT
};
/* This next struct shows how to use the I2C API */
/* Create and initialize an I2C initialization structure */
I2C_Setup I2Cinit = {
        ,              /* 7 bit address mode */
        ,         /* own address - don't care if master */
        ,            /* clkout value (Mhz)  */
        ,            /* a number between 10 and 400*/
        ,              /* number of bits/byte to be received or transmitted (8)*/
        ,              /* DLB mode on*/
                       /* FREE mode of operation on*/
};

I2C_Config testI2C;

/*数字音频接口格式设置
AIC23为主模式，数据为DSP模式，数据长度16位*/
Uint16 digital_audio_inteface_format[]={0x0e,0x53};
/*AIC23的波特率设置，采样率为44.1K*/
Uint16 sample_rate_control[] = {0x10,0x23};
/*AIC23寄存器复位*/
Uint16 reset[] ={0x1e,0x00};
/*AIC23节电方式设置，所有部分均所与工作状态*/
Uint16 power_down_control[] ={0x0c,0x00};
/*AIC23模拟音频的控制
DAC使能，ADC输入选择为Line*/
Uint16 analog_aduio_path_control[] ={0x08,0x10};
/*AIC23数字音频通路的控制*/
Uint16 digital_audio_path_control[] ={0x0a,0x05};
/*AIC23数字接口的使能*/
Uint16 digital_interface_activation[] ={0x12,0x01};
/*AIC23左通路音频调节*/
Uint16 left_line_input_volume_control[] ={0x00,0x17};
/*AIC23右通路音频调节*/
Uint16 right_line_input_volume_control[] ={0x02,0x17};
/*AIC23耳机左通路音频调节*/
Uint16 left_headphone_volume_control[] ={0x05,0xFF};
/*AIC23耳机右通路音频调节*/
Uint16 right_headphone_volume_control[] = {0x07,0xFF};
/*定义McBSP的句柄*/
MCBSP_Handle hMcbsp;

Uint16 i2c_status;
Uint16 i,temp;

void delay(Uint32 k)
{
   while(k--);
}

void main(void)
{

    Uint16 aic23data = ;
    i2c_status = ;
    /* Initialize CSL library - This is REQUIRED !!! */
    /*初始化CSL库*/
    CSL_init();

    /*设置系统的运行速度为140MHz*/
    PLL_config(&myConfig);

    /* Initialize I2C, using parameters in init structure */
    /*初始化I2C的格式*/

//    I2C_config(&Config);
//    I2C_start();

//    I2C_getConfig(&Config1);
    /*I2C is undet reset*/
    I2C_RSET(I2CMDR,);
    /*设置预分频寄存器,I2C的mode clock is 10MHz*/
    delay();
    I2C_RSET(I2CSAR,0x001A);
    I2C_RSET(I2CMDR,0x0620);

    I2C_setup(&I2Cinit);
      /*设置Ｉ２Ｃ的Mater clock*/
    I2C_RSET(I2CCLKL,);
    I2C_RSET(I2CCLKH,);

    I2C_getConfig(&testI2C);

    /*初始化McBSP0*/
    hMcbsp = MCBSP_open(MCBSP_PORT1,MCBSP_OPEN_RESET);
    /*设置McBSP0*/
    MCBSP_config(hMcbsp,&Mcbsp1Config);
    /*启动McBSP0*/
    MCBSP_start(hMcbsp,
                MCBSP_RCV_START | MCBSP_XMIT_START,
                );

    MCBSP_getConfig(hMcbsp,&Mcbsptest);

    /*reset AIC23*/
    i2c_status = I2C_write( reset,          //pointer to data array
                            ,                //length of data to be transmitted
                            ,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            ,                //transfer mode of operation
                                        //time out for bus busy
                            );
    delay();
    /*设置AIC23各部分均工作*/
    i2c_status = I2C_write( power_down_control,//pointer to data array
                            ,                //length of data to be transmitted
                            ,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            ,                //transfer mode of operation
                                        //time out for bus busy
                            );
    /*设置AIC23的数字接口*/
    i2c_status = I2C_write( digital_audio_inteface_format,//pointer to data array
                            ,                //length of data to be transmitted
                            ,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            ,                //transfer mode of operation
                                        //time out for bus busy
                               );
     /*设置AIC23模拟通路*/
/*    i2c_status = I2C_write( analog_aduio_path_control,//pointer to data array
                            2,                //length of data to be transmitted
                            1,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            1,                //transfer mode of operation
                            30000            //time out for bus busy
                            );*/
    /*设置数字通路*/
    i2c_status = I2C_write( digital_audio_path_control,//pointer to data array
                            ,                //length of data to be transmitted
                            ,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            ,                //transfer mode of operation
                                        //time out for bus busy
                              );
    /*设置AIC23的采样率*/
    i2c_status = I2C_write( sample_rate_control,//pointer to data array
                            ,                //length of data to be transmitted
                            ,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            ,                //transfer mode of operation
                                        //time out for bus busy
                            );
    /*设置耳机音量*/
    i2c_status = I2C_write( left_headphone_volume_control,//pointer to data array
                            ,                //length of data to be transmitted
                            ,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            ,                //transfer mode of operation
                                        //time out for bus busy
                            );
    i2c_status = I2C_write( right_headphone_volume_control,//pointer to data array
                            ,                //length of data to be transmitted
                            ,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            ,                //transfer mode of operation
                                        //time out for bus busy
                            );
    /*设置Line输入的音量*/
    i2c_status = I2C_write( left_line_input_volume_control,//pointer to data array
                            ,                //length of data to be transmitted
                            ,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            ,                //transfer mode of operation
                                        //time out for bus busy
                            );
    i2c_status = I2C_write( right_line_input_volume_control,//pointer to data array
                            ,                //length of data to be transmitted
                            ,                //master or slaver
                            CODEC_ADDR,        //slave address to transmit to
                            ,                //transfer mode of operation
                                        //time out for bus busy
                            );
    /*启动AIC23*/
    i2c_status = I2C_write( digital_interface_activation,//pointer to data array
               ,                //length of data to be transmitted
               ,                //master or slaver
               CODEC_ADDR,        //slave address to transmit to
               ,                //transfer mode of operation
                           //time out for bus busy
               );

    /*回放音频*/
    //每次读取256个字符，然后进行解析
    //现在需要解决的问题是，1. 确定多久采样一次。2. 滤波的问题
    //3. 从Line in输入改成麦克风

    //进行FFT的初始化
    InitForFFT();

    while(TRUE)
    {
        for ( i=;i<SAMPLENUMBER;i++ )
        {
            //INPUT[i]=sin(PI*2*i/SAMPLENUMBER*3)*1024;
            while(!MCBSP_rrdy(hMcbsp)){};

            INPUT[i] = MCBSP_read16(hMcbsp);
        }

//        while(!MCBSP_rrdy(hMcbsp)){};
//        aic23data = MCBSP_read16(hMcbsp);
//                MCBSP_write16(hMcbsp,aic23data);

        for ( i=;i<SAMPLENUMBER;i++ )
        {
            fWaveR[i]=INPUT[i];
            fWaveI[i]=0.0f;
            w[i]=0.0f;
        }
        FFT(fWaveR,fWaveI);
        for ( i=;i<SAMPLENUMBER;i++ )
        {
            DATA[i]=w[i];
        }
    }
}

7. 接下来的问题是没有安装CSL库，芯片支持库。这个就是DSP5509的外设函数库，很方便实用。安装C55xxCSL.exe即可得到CSL库。