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TLV320AIC3106 音频芯片采集问题

时间：10-02 整理：3721RD 点击：

用 TLV320AIC3106  音频芯片ADC 采集正弦波，采集到的32位int型数据点的波形如下图所示：  为什么不是正常的正弦波呢？

你好：

你的纵坐标是什么？是数据的十进制吗？

如果采集的模拟信号超过了ADC的模拟输入范围，或者gain过大，还原的数据就会失真。

如果没有超范围，请沿着你的信号线路检查。

或者详细描述你的信号线路，简述你的codec设置，不然很难判断是哪里的问题。

是十进制，采集的正弦信号频率是1khz,峰峰值是1v,应该没有超过输入范围，

codec的分辨率是32位，具体设置如下：

Int16 aic3106_tone_lineout(float *dac,long length )
{
Int16 msec, sec;
Int16 sample;
long i,j;
Int32 sample_data[4800] = {0};
Int32 sample_data2;


/* Configure AIC3106 */
EVMOMAPL137_AIC3106_rset( AIC3106_PAGESELECT, 0 ); // Select page 0
EVMOMAPL137_AIC3106_rset( AIC3106_RESET, 0x80 ); // Reset AIC3106
/* ------------------------------------------------------------------------ *
* *
* AIC3106 Setup *
* *
* AIC3106.MCLK = PLL1705.SCK02 *
* FS = ( AIC3106.MCLK * K ) / ( 2048 * P ) *
* *
* For a FS=[48 kHz] & MCLK=[22.5792 MHz] *
* : 48kHz = ( 22.5792 MHz * K ) / ( 2048 * P ) *
* : P = 2, K[J.D] = 8.7075 *
* *
* ------------------------------------------------------------------------ */
/* Configure AIC3106 registers */

EVMOMAPL137_AIC3106_rset( 3, 0x22 ); // 5 PLL A <- [PLL=OFF][Q=4][P=2]
EVMOMAPL137_AIC3106_rset( 4, 0x20 ); // 4 PLL B <- [J=8]
EVMOMAPL137_AIC3106_rset( 5, 0x6E ); // 5 PLL C <- [D=7075]
EVMOMAPL137_AIC3106_rset( 6, 0x23 ); // 6 PLL D <- [D=7075]
EVMOMAPL137_AIC3106_rset( 7, 0x0A ); // 7 Codec Datapath Setup <- [FS=48 kHz][LeftDAC=LEFT][RightDAC=RIGHT]
EVMOMAPL137_AIC3106_rset( 8, 0x00 ); // 8 Audio Interface Control A <- [BCLK=Slave][MCLK=Slave]
EVMOMAPL137_AIC3106_rset( 9, 0x30 ); // 9 Audio Interface Control B <- [I2S mode][32 bit]
EVMOMAPL137_AIC3106_rset( 10, 0x00); // 10 Audio Interface Control C <- [Data offset=0]
EVMOMAPL137_AIC3106_rset( 15, 0 ); // 15 Left ADC PGA Gain <- [Mute=OFF]
EVMOMAPL137_AIC3106_rset( 16, 0 ); // 16 Right ADC PGA Gain <- [Mute=OFF]
EVMOMAPL137_AIC3106_rset( 19, 0x04 ); // 19 LINE1L to Left ADC <- [SingleEnd][Gain=0dB][Power=ON][SoftStep=OncePerFS]
EVMOMAPL137_AIC3106_rset( 22, 0x04 ); // 22 LINE1R to Right ADC <- [SingleEnd][Gain=0dB][Power=ON][SoftStep=OncePerFS]
EVMOMAPL137_AIC3106_rset( 27, 0 ); // 27 Left AGC B <- [OFF]
EVMOMAPL137_AIC3106_rset( 30, 0 ); // 30 Right AGC B <- [OFF]
EVMOMAPL137_AIC3106_rset( 37, 0xE0 ); // 37 DAC Power & Output Dvr <- [LeftDAC=ON][RightDAC=ON][HPLCOM=SingleEnd]
EVMOMAPL137_AIC3106_rset( 38, 0x10 ); // 38 High Power Output Dvr <- [HPRCOM=SingleEnd][ShortCircuit=OFF]
EVMOMAPL137_AIC3106_rset( 43, 0 ); // 43 Left DAC Digital Volume <- [Mute=OFF][Gain=0dB]
EVMOMAPL137_AIC3106_rset( 44, 0 ); // 44 Right DAC Digital Volume <- [Mute=OFF][Gain=0dB]
EVMOMAPL137_AIC3106_rset( 47, 0x80 ); // 47 DAC_L1 to HPLOUT Volume <- [Routed]
EVMOMAPL137_AIC3106_rset( 51, 0x09 ); // 51 HPLOUT Output <- [Mute=OFF][Power=ON]
EVMOMAPL137_AIC3106_rset( 58, 0 ); // 58 HPLCOM Output <- []
EVMOMAPL137_AIC3106_rset( 64, 0x80 ); // 64 DAC_R1 to HPROUT Volume <- [Routed]
EVMOMAPL137_AIC3106_rset( 65, 0x09 ); // 65 HPROUT Output <- [Mute=OFF][Power=ON]
EVMOMAPL137_AIC3106_rset( 72, 0 ); // 72 HPRCOM Output <- []
EVMOMAPL137_AIC3106_rset( 82, 0x80 ); // 82 DAC_L1 to LEFT_LOP/M Volume <- [Routed]
EVMOMAPL137_AIC3106_rset( 86, 0x09 ); // 83 LINE2R to LEFT_LOP/M Volume <- []
EVMOMAPL137_AIC3106_rset( 92, 0x80 ); // 92 DAC_R1 to RIGHT_LOP/M Volume <- [Routed]
EVMOMAPL137_AIC3106_rset( 93, 0x09 ); // 93 RIGHT_LOP/M Output <- [Mute=OFF][Power=ON]
EVMOMAPL137_AIC3106_rset( 101, 0x01 ); // 101 GPIO Control Register B <- [CODEC_CLKIN = CLKdiv_OUT]
EVMOMAPL137_AIC3106_rset( 102, 0 ); // 102 Clock Generation Control <- [PLLCLK_IN and CLKdiv_IN use MCLK]

/* Initialize MCASP1 */
mcasp = &MCASP_MODULE_1;
/* ---------------------------------------------------------------- *
* *
* McASP1 is in MASTER mode. *
* BCLK & WCLK come from McASP1 *
* DIN is used by write16/write32 *
* DOUT is usec by read16/read32 *
* *
* ---------------------------------------------------------------- */
mcasp->regs->GBLCTL = 0; // Reset
mcasp->regs->RGBLCTL = 0; // Reset RX
mcasp->regs->XGBLCTL = 0; // Reset TX
mcasp->regs->PWRDEMU = 1; // Free-running

/* RX */
mcasp->regs->RMASK = 0xffffffff; // No padding used
mcasp->regs->RFMT = 0x00008078; // MSB 16bit, 1-delay, no pad, CFGBus
mcasp->regs->AFSRCTL = 0x00000112; // 2TDM, 1bit Rising, INTERNAL FS, word
mcasp->regs->ACLKRCTL = 0x000000AF; // Rising INTERNAL CLK,(from tx side)
mcasp->regs->AHCLKRCTL = 0x00000000; // INT CLK (from tx side)
mcasp->regs->RTDM = 0x00000003; // Slots 0,1
mcasp->regs->RINTCTL = 0x00000000; // Not used
mcasp->regs->RCLKCHK = 0x00FF0008; // 255-MAX 0-MIN, div-by-256

/* TX */
mcasp->regs->XMASK = 0xffffffff; // No padding used
mcasp->regs->XFMT = 0x00008078; // MSB 16bit, 1-delay, no pad, CFGBus
mcasp->regs->AFSXCTL = 0x00000112; // 2TDM, 1bit Rising edge INTERNAL FS, word
mcasp->regs->ACLKXCTL = 0x000000AF; // ASYNC, Rising INTERNAL CLK, div-by-16
mcasp->regs->AHCLKXCTL = 0x00000000; // EXT CLK
mcasp->regs->XTDM = 0x00000003; // Slots 0,1
mcasp->regs->XINTCTL = 0x00000000; // Not used
mcasp->regs->XCLKCHK = 0x00FF0008; // 255-MAX 0-MIN, div-by-256

mcasp->regs->SRCTL5 = 0x000D; // MCASP1.AXR1[5] --> DIN
mcasp->regs->SRCTL0 = 0x000E; // MCASP1.AXR1[0] <-- DOUT
mcasp->regs->PFUNC = 0; // All MCASPs
mcasp->regs->PDIR = 0x14000020; // All inputs except AXR0[5], ACLKX1, AFSX1

mcasp->regs->DITCTL = 0x00000000; // Not used
mcasp->regs->DLBCTL = 0x00000000; // Not used
mcasp->regs->AMUTE = 0x00000000; // Not used

/* Starting sections of the McASP*/
mcasp->regs->XGBLCTL |= GBLCTL_XHCLKRST_ON; // HS Clk
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XHCLKRST_ON ) != GBLCTL_XHCLKRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RHCLKRST_ON; // HS Clk
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RHCLKRST_ON ) != GBLCTL_RHCLKRST_ON );

mcasp->regs->XGBLCTL |= GBLCTL_XCLKRST_ON; // Clk
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XCLKRST_ON ) != GBLCTL_XCLKRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RCLKRST_ON; // Clk
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RCLKRST_ON ) != GBLCTL_RCLKRST_ON );

mcasp->regs->XSTAT = 0x0000ffff; // Clear all
mcasp->regs->RSTAT = 0x0000ffff; // Clear all

mcasp->regs->XGBLCTL |= GBLCTL_XSRCLR_ON; // Serialize
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XSRCLR_ON ) != GBLCTL_XSRCLR_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RSRCLR_ON; // Serialize
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RSRCLR_ON ) != GBLCTL_RSRCLR_ON );

/* Write a 0, so that no underrun occurs after releasing the state machine */
mcasp->regs->XBUF5 = 0;
mcasp->regs->RBUF0 = 0;

mcasp->regs->XGBLCTL |= GBLCTL_XSMRST_ON; // State Machine
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XSMRST_ON ) != GBLCTL_XSMRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RSMRST_ON; // State Machine
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RSMRST_ON ) != GBLCTL_RSMRST_ON );

mcasp->regs->XGBLCTL |= GBLCTL_XFRST_ON; // Frame Sync
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XFRST_ON ) != GBLCTL_XFRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RFRST_ON; // Frame Sync
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RFRST_ON ) != GBLCTL_RFRST_ON );


/* Start by sending a dummy write */
while( ! ( mcasp->regs->SRCTL5 & 0x10 ) ); // Check for Tx ready
mcasp->regs->XBUF5 = 0;

i=0;
/* Play Tone */
for ( sec = 0 ; sec < 30 ; sec++ )
{
for ( msec = 0 ; msec < 1000 ; msec++ )
{
for ( sample = 0 ; sample < 48 ; sample++ )
{

/* Read then write the left sample */
while ( ! ( MCASP1_SRCTL0 & 0x20 ) );
sample_data[i%4800] = MCASP1_RBUF0_32BIT;
while ( ! ( MCASP1_SRCTL5 & 0x10 ) );
MCASP1_XBUF5_32BIT = sample_data[i++%4800];

/* Read then write the right sample */
while ( ! ( MCASP1_SRCTL0 & 0x20 ) );
sample_data2 = MCASP1_RBUF0_32BIT;
while ( ! ( MCASP1_SRCTL5 & 0x10 ) );
MCASP1_XBUF5_32BIT = sample_data2;


}
}
}
ofstream outfile2("resinetable.dat",ios::binary);
if(! outfile2)
printf("cannot open received.dat file!\n");
outfile2.write((const char *)sample_data,4800*sizeof(int));//473088 439296 236544
outfile2.close();

/* Close Codec */
EVMOMAPL137_AIC3106_rset( AIC3106_PAGESELECT, 0 ); // Select Page 0
EVMOMAPL137_AIC3106_rset( AIC3106_RESET, 0x80 ); // Reset the AIC3106

/* Close McASP */
mcasp->regs->SRCTL0 = 0; // Serializers
mcasp->regs->SRCTL1 = 0;
mcasp->regs->SRCTL2 = 0;
mcasp->regs->SRCTL3 = 0;
mcasp->regs->SRCTL5 = 0;
mcasp->regs->GBLCTL = 0; // Global Reset

return 0;
}

采集的是左声道的数据，存在sample_data[]数组里

上图的波形只要把最高和最低的两部分移动加上或减去2^31后就是正弦波了，可是还有一个问题，调整后的正弦波并不关于0上下对称，而是多了一个直流偏移，这是什么原因造成的呢？

你好：

       你可以理解你将所有的数据都加了一个数据，所以数据被整体上移，这样就是相当于多了一个直流偏置。

请问正常的应该是什么样的啊？我现在也在用AIC3106采集数据，觉得踩得正弦不对，我也是48k采1K   但是猜到的波形用CCS画出来，明显不正确，能加好友给指导一下吗？非常感谢！

你好，我也有同样的问题，不知你是如何解决的，可以留个联系方式吗？请教前辈一下

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