TI中文支持网Part Number:TMS320VC5509A
为什么DSP5509A采集得到的100Hz的正弦信号会存在其他频率。采样频率为8k，如下图：
像是经过调制之后的正弦信号，不知道为什么?
Shine：
请问是自己的板子还是EVM板？请先看一下是不是前端ADC的配置问题？
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ang gao：
EVM板子，这个ADC应该怎么配置。
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Shine：
请描述一下您的硬件测试环境，代码是自己写的还是用的例程里的？
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ang gao：
PLL_Config myConfig = { 0, //IAI: the PLL locks using the same process that was underway //before the idle mode was entered 1, //IOB: If the PLL indicates a break in the phase lock, //it switches to its bypass mode and restarts the PLL phase-locking //sequence 24, //PLL multiply value; multiply 24 times 1 //Divide by 2 PLL divide value; it can be either PLL divide value //(when PLL is enabled), or Bypass-mode divide value //(PLL in bypass mode, if PLL multiply value is set to 1)};
unsigned int play_mode; // 0:play 1:record and play
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 */ 0, /* ABIS = 0 */ MCBSP_SPCR1_RINTM_RRDY, /* RINTM = 0 */ 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 */ 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(1), /* RFRLEN1 = 1 */ MCBSP_RCR1_RWDLEN1_16BIT /* RWDLEN1 = 2 */ ), MCBSP_RCR2_RMK( MCBSP_RCR2_RPHASE_SINGLE, /* RPHASE = 0 */ MCBSP_RCR2_RFRLEN2_OF(0), /* 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(1), /* XFRLEN1 = 1 */ MCBSP_XCR1_XWDLEN1_16BIT /* XWDLEN1 = 2 */
), MCBSP_XCR2_RMK( MCBSP_XCR2_XPHASE_SINGLE, /* XPHASE = 0 */ MCBSP_XCR2_XFRLEN2_OF(0), /* 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 */ 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 = { 0, /* 7 bit address mode */ 0, /* own address – don't care if master */ 84, /* clkout value (Mhz) */ 50, /* a number between 10 and 400*/ 0, /* number of bits/byte to be received or transmitted (8)*/ 0, /* DLB mode on*/ 1 /* FREE mode of operation on*/};
I2C_Config testI2C;
AIC23为主模式，数据为DSP模式，数据长度16位*/Uint16 digital_audio_inteface_format[2]={0x0e,0x53};/*AIC23的波特率设置，采样率为44.1K*/Uint16 sample_rate_control[2] = {0x10,0x2e};/*AIC23寄存器复位*/Uint16 reset[2] ={0x1e,0x00};/*AIC23节电方式设置，所有部分均所与工作状态*/Uint16 power_down_control[2] ={0x0c,0x00};/*AIC23模拟音频的控制DAC使能，ADC输入选择为Line，mic输入，增益为0*/Uint16 analog_aduio_path_control[2] ={0x08,0x14};/*AIC23数字音频通路的控制*/Uint16 digital_audio_path_control[2] ={0x0a,0x05};/*AIC23数字接口的使能*/Uint16 digital_interface_activation[2] ={0x12,0x01};/*AIC23左通路音频调节*/Uint16 left_line_input_volume_control[2] ={0x00,0x17};/*AIC23右通路音频调节*/Uint16 right_line_input_volume_control[2] ={0x02,0x17};/*AIC23耳机左通路音频调节*/Uint16 left_headphone_volume_control[2] ={0x05,0xFF};/*AIC23耳机右通路音频调节*/Uint16 right_headphone_volume_control[2] = {0x07,0xFF};/*定义McBSP的句柄*/
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ang gao：
代码调用dsplib内的sin函数
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Shine：
您可以参考附件DSK5509A开发板里的tone例程。dsk5509a_v1.zip
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ang gao：
我现在这个是mic in ,如何改为line in 输入呢
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Shine：
我看了 一下代码，这个是配置AIC23的/* Codec configuration settings */DSK5509_AIC23_Config config = { 0x0017, // 0 DSK5509_AIC23_LEFTINVOL Left line input channel volume 0x0017, // 1 DSK5509_AIC23_RIGHTINVOL Right line input channel volume 0x00d8, // 2 DSK5509_AIC23_LEFTHPVOL Left channel headphone volume 0x00d8, // 3 DSK5509_AIC23_RIGHTHPVOL Right channel headphone volume 0x0011, // 4 DSK5509_AIC23_ANAPATH Analog audio path control 0x0000, // 5 DSK5509_AIC23_DIGPATH Digital audio path control 0x0000, // 6 DSK5509_AIC23_POWERDOWN Power down control 0x0043, // 7 DSK5509_AIC23_DIGIF Digital audio interface format 0x0081, // 8 DSK5509_AIC23_SAMPLERATE Sample rate control 0x0001 // 9 DSK5509_AIC23_DIGACT Digital interface activation};具体怎么设置AIC23寄存器参数，建议去音频论坛咨询。https://e2echina.ti.com/support/audio/f/audio-forum
