TI中文支持网C5509A的DMA采用乒乓方式从MCBSP接收和发送数据，DMA设置为块中断，每次进入中断后，设置下一次的地址，最终的效果是，从AIC23的音频输入口输入声音信号，从输出口听到的声音不连续，感觉有停顿感。主要代码如下，麻烦请帮我看看是哪里的问题。
每次上电后先进DMA的发送中断，隔一个采样时钟周期（采用8KHz采样率，相隔125us）后进入DMA接收中断，接收中断中将程序状态转到信号处理函数Signal_Process();，其余时间都不调用信号处理函数，在信号处理函数中将接收到的数据分为左右通道，然后再将左右通道的数据组合后赋给发送数组。
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 left justify the data and zero fill LSBS */
MCBSP_SPCR1_CLKSTP_DISABLE, /* CLKSTP = 0 Clock stop mode disable */
MCBSP_SPCR1_DXENA_ON, /* DXENA = 1 DX delay enabler on */
MCBSP_SPCR1_ABIS_DISABLE, /* ABIS = 0 reserved always write 0*/
MCBSP_SPCR1_RINTM_RRDY, /* RINTM = 0 sends a receive INT request to CPU when the RRDY bit
change from 0 to 1, indicating that receive data is ready to be read*/
0, /* RSYNCER = 0 receive frame-sync error bit, no error*/
MCBSP_SPCR1_RRST_DISABLE /* RRST = 0 reset the receiver*/
),
MCBSP_SPCR2_RMK(
MCBSP_SPCR2_FREE_NO, /* FREE = 0 free run bit, The McBSP transmit and receive clocks are affected as determined by the SOFT bit*/
MCBSP_SPCR2_SOFT_NO, /* SOFT = 0 Soft stop bit, Hard stop*/
MCBSP_SPCR2_FRST_FSG, /* FRST = 0 Frame-sync logic reset bit*/
MCBSP_SPCR2_GRST_CLKG, /* GRST = 0 Sample rate generator reset bit */
MCBSP_SPCR2_XINTM_XRDY, /* XINTM = 0 transmit interrupt mode bits XRDY bit changes from 0 to1 */
0, /* XSYNCERR = N/A transmit frame-sync error bit, no error*/
MCBSP_SPCR2_XRST_DISABLE /* XRST = 0 transmit ready bit, not ready*/
//注意：开始一定要设置为disable，否则不能设置它的寄存器，全部为默认值，导致不能正常接收，
//在程序调用C库函数mcbspstart时会在设为1，McBSP便退出reset状态开始工作
),
/*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 Receive frame length 1 bits(1 to 128 words),Frame length=(RFRLEN1+1)words*/
MCBSP_RCR1_RWDLEN1_16BIT /* RWDLEN1 = 2 Receive word length 1 bits, 16bit*/
),
MCBSP_RCR2_RMK(
MCBSP_RCR2_RPHASE_SINGLE, /* RPHASE = 0 Receive phase number bit, single-phase frame*/
MCBSP_RCR2_RFRLEN2_OF(0), /* RFRLEN2 = 0 */
MCBSP_RCR2_RWDLEN2_8BIT, /* RWDLEN2 = 0 */
MCBSP_RCR2_RCOMPAND_MSB, /* RCOMPAND = 0 receive companding mode bits, 0, no companding,MSB received first*/
MCBSP_RCR2_RFIG_YES, /* RFIG = 0 Receive frame-sync ignore bit, 1, frame-sync detect */
MCBSP_RCR2_RDATDLY_1BIT /* RDATDLY = 1 Receive data delay bits, 1-bit data delay*/
),
MCBSP_XCR1_RMK(
MCBSP_XCR1_XFRLEN1_OF(1), /* XFRLEN1 = 1 Transmit frame length 1(1 to 128 words),Frame length=(XFRLEN1+1)words */
MCBSP_XCR1_XWDLEN1_16BIT /* XWDLEN1 = 2 Transmit word length 1.16bit*/
),
MCBSP_XCR2_RMK(
MCBSP_XCR2_XPHASE_SINGLE, /* XPHASE = 0 Transmit phase number bit, single-phase frame*/
MCBSP_XCR2_XFRLEN2_OF(0), /* XFRLEN2 = 0 */
MCBSP_XCR2_XWDLEN2_8BIT, /* XWDLEN2 = 0 */
MCBSP_XCR2_XCOMPAND_MSB, /* XCOMPAND = 0 Transmit companding mode bits, 0, no companding,MSB received first*/
MCBSP_XCR2_XFIG_YES, /* XFIG = 0 Transmit frame-sync ignore bit, 1, frame-sync detect */
MCBSP_XCR2_XDATDLY_1BIT /* XDATDLY = 1 Transmit data delay bits, 1-bit data delay*/
),
MCBSP_SRGR1_DEFAULT, /*(0x0001u)FWID=0,CLKGDV=1 */
MCBSP_SRGR2_DEFAULT, /*(0x2000u)CLKSM=1，Sample rate generator input clock mode bit */
MCBSP_MCR1_DEFAULT,
MCBSP_MCR2_DEFAULT,
MCBSP_PCR_RMK(
MCBSP_PCR_IDLEEN_RESET, /* IDLEEN = 0 The McBSP remains active when the PERIPH domain is idled */
MCBSP_PCR_XIOEN_SP, /* XIOEN = 0 Transmit I/O enable bit, CLKX,FSX,DX,CLKS pins are serial port pins*/
MCBSP_PCR_RIOEN_SP, /* RIOEN = 0 Receive I/O enable bit, CLKR,FSR,DR,CLKS pins are serial port pins*/
MCBSP_PCR_FSXM_EXTERNAL, /* FSXM = 0 Transmit frame-sync mode bit,0:transmit fram-sync is supplied by an external source via the FSX pin*/
MCBSP_PCR_FSRM_EXTERNAL, /* FSRM = 0 Receive frame-sync mode bit,0:transmit fram-sync is supplied by an external source via the FSR pin*/
0, /* DXSTAT = N/A */
MCBSP_PCR_CLKXM_INPUT, /* CLKXM = 0 Transmit clock mode bit*/
MCBSP_PCR_CLKRM_INPUT, /* CLKRM = 0 Receive clock mode bit*/
MCBSP_PCR_SCLKME_NO, /* SCLKME = 0 Sample rate generator input clock mode bit,used with CLKSM to select the input clock*/
MCBSP_PCR_FSXP_ACTIVEHIGH, /* FSXP = 0 Transmit frame-sync polarity bit, 0,transmit frame-sync pulses are active high*/
MCBSP_PCR_FSRP_ACTIVEHIGH, /* FSRP = 1 Receive frame-sync polarity bit, 0,receive frame-sync pulses are active high*/
MCBSP_PCR_CLKXP_FALLING, /* CLKXP = 1 Transmit clock polarity bit,1,transmit data is driven on the rising edge of CLKX */
MCBSP_PCR_CLKRP_RISING /* CLKRP = 1 Receive clock polarity bit*/
),
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
};
/* Create DMA Receive Side Configuration */
DMA_Config dmaRcvConfig = {
DMA_DMACSDP_RMK(
DMA_DMACSDP_DSTBEN_NOBURST, //Destination burst :-不使用突发
DMA_DMACSDP_DSTPACK_OFF, //Destination packing :-目标口禁止打包
DMA_DMACSDP_DST_DARAM, //Destination selection :-接收的目标口是DARAM
DMA_DMACSDP_SRCBEN_NOBURST, //Source burst :-源突发禁止
DMA_DMACSDP_SRCPACK_OFF, //Source packing :-源口禁止打包
DMA_DMACSDP_SRC_PERIPH, //Source selection :-外设mcbsp
DMA_DMACSDP_DATATYPE_16BIT //Data type :-设置数据类型16bit字长
), /* DMACSDP 源与目标参数寄存器 */
DMA_DMACCR_RMK(
DMA_DMACCR_DSTAMODE_POSTINC, //Destination address mode :-自动执行后增量（由于本程序中数据类型是16bit，所以+2）
DMA_DMACCR_SRCAMODE_CONST, //Source address mode :-源地址为恒定地址
DMA_DMACCR_ENDPROG_ON, //End of programmation bit :-
//DMA_DMACCR_REPEAT_ON, //Repeat condition :-不管编程配置结束位，结束传输自动初始化开始
DMA_DMACCR_REPEAT_OFF,
DMA_DMACCR_AUTOINIT_ON, //Auto initialization bit :-
DMA_DMACCR_EN_STOP, //Channel enable :-设置时先关闭通道
DMA_DMACCR_PRIO_LOW, //Channel priority :-设置为低优先级
DMA_DMACCR_FS_ELEMENT, //Frame/Element Sync :-单元事件同步
DMA_DMACCR_SYNC_REVT1 //Synchronization control :-McBSP1 Receive Event(REVT1)
), /* DMACCR 通道控制寄存器 */
DMA_DMACICR_RMK(
DMA_DMACICR_BLOCKIE_ON, //Whole block interrupt enable :-块传输完成后中断使能
DMA_DMACICR_LASTIE_OFF, //Last frame interrupt enable :-
DMA_DMACICR_FRAMEIE_OFF, //Whole frame interrupt enable :-
DMA_DMACICR_FIRSTHALFIE_OFF, //Half frame interrupt enable :-
DMA_DMACICR_DROPIE_OFF, //Sync. event drop interrupt enable :-
DMA_DMACICR_TIMEOUTIE_OFF //Time out interrupt enable :-
), /* DMACICR 中断控制寄存器 */
(DMA_AdrPtr)(MCBSP_ADDR(DRR11)), /* DMACSSAL 源地址低位 */
0, /* DMACSSAU 源地址高位*/
(DMA_AdrPtr)&pingrcv, /* DMACDSAL 目的地址低位*/
0, /* DMACDSAU 目的地址高位*/
2, /* DMACEN 1 帧内数据长度 16*2 两个数据一个帧*/
N/2, /* DMACFN 帧数大小 */
0, /* DMACFI */
0 /* DMACEI */
};
/* Create DMA Transmit Side Configuration */
DMA_Config dmaXmtConfig = {
DMA_DMACSDP_RMK(
DMA_DMACSDP_DSTBEN_NOBURST, //Destination burst :-不使用突发
DMA_DMACSDP_DSTPACK_OFF, //Destination packing :-目标口禁止打包
DMA_DMACSDP_DST_PERIPH, //Destination selection :-接收的目标口是外设mcbsp
DMA_DMACSDP_SRCBEN_NOBURST, //Source burst :-源突发禁止
DMA_DMACSDP_SRCPACK_OFF, //Source packing :-源口禁止打包
DMA_DMACSDP_SRC_DARAM, //Source selection :源口为DARAM
DMA_DMACSDP_DATATYPE_16BIT //Data type :-设置数据类型16bit字长
), /* DMACSDP 源与目标参数寄存器 */
DMA_DMACCR_RMK(
DMA_DMACCR_DSTAMODE_CONST, //Destination address mode :-目标口地址为恒定地址
DMA_DMACCR_SRCAMODE_POSTINC, //Source address mode :-自动执行后增量（由于本程序中数据类型是16bit，所以+2）
DMA_DMACCR_ENDPROG_ON, //End of programmation bit :-
//DMA_DMACCR_REPEAT_ON, //Repeat condition :-不管编程配置结束位，结束传输自动初始化开始
DMA_DMACCR_REPEAT_OFF,
DMA_DMACCR_AUTOINIT_ON, //Auto initialization bit :-
DMA_DMACCR_EN_STOP, //Channel enable :-设置时先关闭通道
DMA_DMACCR_PRIO_LOW, //Channel priority :-设置为低优先级
DMA_DMACCR_FS_ELEMENT, //Frame/Element Sync :-单元事件同步
DMA_DMACCR_SYNC_XEVT1 //Synchronization control :-McBSP1 Transmit Event(XEVT1)
), /* DMACCR 通道控制寄存器 */
DMA_DMACICR_RMK(
DMA_DMACICR_BLOCKIE_ON, //Whole block interrupt enable :-块传输完成后中断使能
DMA_DMACICR_LASTIE_OFF, //Last frame interrupt enable :-
DMA_DMACICR_FRAMEIE_OFF, //Whole frame interrupt enable :-
DMA_DMACICR_FIRSTHALFIE_OFF, //Half frame interrupt enable :-
DMA_DMACICR_DROPIE_OFF, //Sync. event drop interrupt enable :-
DMA_DMACICR_TIMEOUTIE_OFF //Time out interrupt enable :-
), /* DMACICR 中断控制寄存器 */
(DMA_AdrPtr)&pingxmt[0], /* DMACSSAL 源地址低位*/
0, /* DMACSSAU 源地址高位 */
(DMA_AdrPtr)(MCBSP_ADDR(DXR11)), /* DMACDSAL 目的地址低位*/
0, /* DMACDSAU 目的地址高位*/
2, /* DMACEN 1 帧内数据长度 16*2 两个数据一个帧*/
N/2, /* DMACFN 帧数大小 */
0, /* DMACFI */
0 /* DMACEI */
};
void AIC23_DataTransfer_Init()
{
Uint16 i;
Uint16 srcAddrHi, srcAddrLo;
Uint16 dstAddrHi, dstAddrLo;
for(i=0;i<N;i++)
{
pingrcv[i] = 0;
pongrcv[i] = 0;
pingxmt[i] = 0;
pongxmt[i] = 0;
}
/* By default, the TMS320C55xx compiler assigns all data symbols word */
/* addresses. The DMA however, expects all addresses to be byte */
/* addresses. Therefore, we must shift the address by 2 in order to */
/* change the word address to a byte address for the DMA transfer. */
srcAddrHi = (Uint16)(((Uint32)(MCBSP_ADDR(DRR11))) >> 15) & 0xFFFFu;
srcAddrLo = (Uint16)(((Uint32)(MCBSP_ADDR(DRR11))) << 1) & 0xFFFFu;
dstAddrHi = (Uint16)(((Uint32)(&pingrcv)) >> 15) & 0xFFFFu;
dstAddrLo = (Uint16)(((Uint32)(&pingrcv)) << 1) & 0xFFFFu;
dmaRcvConfig.dmacssal = (DMA_AdrPtr)srcAddrLo;
dmaRcvConfig.dmacssau = srcAddrHi;
dmaRcvConfig.dmacdsal = (DMA_AdrPtr)dstAddrLo;
dmaRcvConfig.dmacdsau = dstAddrHi;
srcAddrHi = (Uint16)(((Uint32)(&pingxmt[0])) >> 15) & 0xFFFFu;
srcAddrLo = (Uint16)(((Uint32)(&pingxmt[0])) << 1) & 0xFFFFu;
dstAddrHi = (Uint16)(((Uint32)(MCBSP_ADDR(DXR11))) >> 15) & 0xFFFFu;
dstAddrLo = (Uint16)(((Uint32)(MCBSP_ADDR(DXR11))) << 1) & 0xFFFFu;
dmaXmtConfig.dmacssal = (DMA_AdrPtr)srcAddrLo;
dmaXmtConfig.dmacssau = srcAddrHi;
dmaXmtConfig.dmacdsal = (DMA_AdrPtr)dstAddrLo;
dmaXmtConfig.dmacdsau = dstAddrHi;
/* Open MCBSP Port 1 and set registers to their power on defaults */
hMcbsp = MCBSP_open(MCBSP_PORT1, MCBSP_OPEN_RESET);
/* Open DMA channels 4 & 5 and set regs to power on defaults */
hDmaRcv = DMA_open(DMA_CHA4,DMA_OPEN_RESET);
hDmaXmt = DMA_open(DMA_CHA5,DMA_OPEN_RESET);
/* Get interrupt event associated with DMA receive and transmit */
xmtEventId = DMA_getEventId(hDmaXmt);
rcvEventId = DMA_getEventId(hDmaRcv);
/* Temporarily disable interrupts and clear any pending */
/* interrupts for MCBSP transmit */
// old_intm = IRQ_globalDisable();
/* Clear any pending interrupts for DMA channels */
IRQ_clear(xmtEventId);
IRQ_clear(rcvEventId);
/* Enable DMA interrupt in IER register */
IRQ_enable(xmtEventId);
IRQ_enable(rcvEventId);
/* Set Start Of Interrupt Vector Table */
// IRQ_setVecs(0x10000);
/* Place DMA interrupt service addresses at associate vector */
IRQ_plug(xmtEventId,&dmaXmtIsr);
IRQ_plug(rcvEventId,&dmaRcvIsr);
/* Write values from configuration structure to MCBSP control regs */
MCBSP_config(hMcbsp, &Mcbsp1Config);
/* Write values from configuration structure to DMA control regs */
DMA_config(hDmaRcv,&dmaRcvConfig);
DMA_config(hDmaXmt,&dmaXmtConfig);
xfreebuf = xpongbuf;
rfreebuf = rpongbuf;
/* Enable all maskable interrupts */
IRQ_globalEnable();
/* Start Sample Rate Generator and Enable Frame Sync */
MCBSP_start(hMcbsp,
MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC,
0x300u);
/* Enable DMA */
DMA_start(hDmaRcv);
DMA_start(hDmaXmt);
/* Take MCBSP transmit and receive out of reset */
MCBSP_start(hMcbsp,
MCBSP_XMIT_START | MCBSP_RCV_START,
0u);
while(DMA_FGETH(hDmaRcv, DMACCR, ENDPROG));
dstAddrHi = (Uint16)(((Uint32)(&pongrcv)) >> 15) & 0xFFFFu;
dstAddrLo = (Uint16)(((Uint32)(&pongrcv)) << 1) & 0xFFFFu;
dmaRcvConfig.dmacdsal = (DMA_AdrPtr)dstAddrLo;
dmaRcvConfig.dmacdsau = dstAddrHi;
srcAddrHi = (Uint16)(((Uint32)(&pongxmt[0])) >> 15) & 0xFFFFu;
srcAddrLo = (Uint16)(((Uint32)(&pongxmt[0])) << 1) & 0xFFFFu;
dmaXmtConfig.dmacssal = (DMA_AdrPtr)srcAddrLo;
dmaXmtConfig.dmacssau = srcAddrHi;
DMA_FSETH(hDmaRcv, DMACCR, ENDPROG,1);
DMA_FSETH(hDmaXmt, DMACCR, ENDPROG,1);
}
interrupt void dmaXmtIsr(void) {
static int * ptr;
unsigned int ptraddrhi, ptraddrlow;
DMA_FSETH(hDmaXmt,DMACSR,BLOCK,0);
if(xfreebuf == xpingbuf)
{
xfreebuf = xpongbuf;
ptr = pongxmt;
}
else
{
xfreebuf = xpingbuf;
ptr = pingxmt;
}
while(DMA_FGETH(hDmaXmt, DMACCR, ENDPROG));
//修改DMA地址
ptraddrhi = (unsigned int)(((unsigned long)(ptr)) >> 15) & 0xFFFFu;
//因为DMA都使用字节地址，所以必须左移一位
ptraddrlow= (unsigned int)(((unsigned long)(ptr)) << 1) & 0xFFFFu;
dmaXmtConfig.dmacssal = (DMA_AdrPtr)ptraddrlow;
dmaXmtConfig.dmacssau = ptraddrhi;
DMA_FSETH(hDmaXmt, DMACCR, ENDPROG,1);
}
interrupt void dmaRcvIsr(void) {
static int * ptr;
unsigned int ptraddrhi, ptraddrlow;
DMA_FSETH(hDmaRcv,DMACSR,BLOCK,0);
if(rfreebuf == rpingbuf)
{
rfreebuf = rpongbuf;
ptr = pongrcv;
}
else
{
rfreebuf = rpingbuf;
ptr = pingrcv;
}
while(DMA_FGETH(hDmaRcv, DMACCR, ENDPROG));
//修改DMA地址
ptraddrhi = (unsigned int)(((unsigned long)(ptr)) >> 15) & 0xFFFFu;
//因为DMA都使用字节地址，所以必须左移一位
ptraddrlow= (unsigned int)(((unsigned long)(ptr)) << 1) & 0xFFFFu;
dmaRcvConfig.dmacdsal = (DMA_AdrPtr)ptraddrlow;
dmaRcvConfig.dmacdsau = ptraddrhi;
DMA_FSETH(hDmaRcv, DMACCR, ENDPROG,1);
State_Work = State_Signal_Process;
}
void Signal_Process()
{
Uint16 i,j=0;
if(rfreebuf == rpongbuf)//(PingPong == PING)
{
for(i=0;i<N;i=i+2)
{
Leftchannel_Buffer[j] = pongrcv[i];
Rightchannel_Buffer[j] = pongrcv[i+1];
j++;
}
}
else
{
for(i=0;i<N;i=i+2)
{
Leftchannel_Buffer[j] = pingrcv[i];
Rightchannel_Buffer[j] = pingrcv[i+1];
j++;
}
}
j = 0;
if(xfreebuf == xpongbuf)
{
for(i=0;i<N;i=i+2)
{
pongxmt[i] = Leftchannel_Buffer[j];
pongxmt[i+1] = Rightchannel_Buffer[j];
j++;
}
}
else
{
for(i=0;i<N;i=i+2)
{
pingxmt[i] = Leftchannel_Buffer[j];
pingxmt[i+1] = Rightchannel_Buffer[j];
j++;
}
}
}
li wan1：
回复 lan teng:
可以问您一下具体是修改了哪些地方吗？我用的DM642，也要做音频处理
lan teng：
回复 li wan1:
中断中的地址更新方式，应该用CSL库函数更新地址。
li wan1：
回复 lan teng:
可以把你的程序发我一份吗？我没有完整的EDMA案例，我这边一直被EDMA卡着，发现库函数中的EDMA的操作句柄的结构体类型不对，
li wan1：
回复 lan teng:
我得邮箱596121344@qq.com
lan teng：
回复 li wan1:
就是把中断中的
dmaXmtConfig.dmacssal = (DMA_AdrPtr)ptraddrlow;
dmaXmtConfig.dmacssau = ptraddrhi;
改为
DMA_RSETH(hDmaXmt, DMACSSAU, ptraddrhi); DMA_RSETH(hDmaXmt, DMACSSAL, ptraddrlow);
其他部分程序都是对的。
li wan1：
回复 lan teng:
这样啊，谢谢你啊！不过你能不能补发一个EDMA_Handle在库函数中的定义贴出来，我的在csl_edma.h中的类型定义是Uint 32，这应该不对吧，所以麻烦你把这个也贴出来，万分感谢
lan teng：
回复 li wan1:
我用的是5509A，你在CCS安装目录下找CCStudio_v3.3\C5500\csl\include中就有。
li wan1：
回复 lan teng:
lan teng ，你好，我在DM642的板子上使用AIC23B和MCASP做音频信号的回响测试和FIR滤波时出现很大的杂声，你能不能帮忙看看是什么原因：
问题描述：
1、将采集进来的数据不经任何处理直接发送出去，声音很清晰，且无杂声；
2、当测试简单的回响时，将回响信号x和原始信号y进行一个简单的算法，比如a=(x+3*y)/4，再把a通过XBUF播放出去，这是出现了很大的杂声，但是当算法设定为a=x+3*y或者a=x+y时，有没有杂声出现，可以很清晰的听到回响的效果
3、当测试FIR低通滤波时，将采集的音频信号和一个已知的低通滤波器系数相乘后发出时，就出现了很大的杂声；但是当我把滤波系数扩大10000倍，变成整数后，杂声就变得小些了，但还是存在
因为回响和FIR滤波在C6713上测试时是没杂声的，在C6713上的数据类型均是使用的float，一开始我以为是数据类型不对，所以将数据类型也修改为float，问题还是没有解决，后来有尝试了不同的数据类型，比如unsigned int等，问题同样没能解决。后来突然想到C6713是浮点DSP，而DM642是定点DSP，你觉得会是这个原因吗？网上也有人说，定点的DSP在做浮点运算是要通过Q格式的数据运算
不知道您或者您身边的同事有没有遇到过这样问题，遇到后你们是怎么解决的。或者你们觉得问题出在哪？
lan teng：
回复 li wan1:
不好意思，我这边没有深入研究过AIC23，只是简单的用它采集音频信号，然后进行处理后输出。但是，之前我遇到过采集信号处理后，输出声音有杂音的现象，具体怎么改的忘了，好像是数据处理部分的问题。
从你的描述看，没杂音的算法都比较简单，有杂音的算法相对复杂一些，所以，我感觉你还是在算法的实现方式上查查。
对于滤波系数，因为我用的定点DSP，所以一般都是设计好滤波器系数后，转换为相应的位数，如以16位表示，就乘以2^16。滤波效果还可以，你试试。其它的就帮不上了。
