最近再用BF533做关于语音信号的课程设计，之前做过关于视频图片一些实验设计，先是拿来系统自带的例程Audio Codec Talkthrough - I2S (C)跑了一下，代码感觉基本看明白了，然后做了一些修改就出了一些问题，由于篇幅有限，先放一下原例程初始化函数

#include "Talkthrough.h"

//--------------------------------------------------------------------------//
// Function: Init_EBIU             //
//                   //
// Description: This function initializes and enables asynchronous memory  //
//    banks in External Bus Interface Unit so that Flash A can be //
//    accessed.             //
//--------------------------------------------------------------------------//
void Init_EBIU(void)
{
*pEBIU_AMBCTL0 = 0x7bb07bb0;
*pEBIU_AMBCTL1 = 0x7bb07bb0;
*pEBIU_AMGCTL = 0x000f;
}

//--------------------------------------------------------------------------//
// Function: Init_Flash             //
//                   //
// Description: This function initializes pin direction of Port A in Flash A//
//    to output.  The AD1836_RESET on the ADSP-BF533 EZ-KIT board //
//    is connected to Port A.          //
//--------------------------------------------------------------------------//
void Init_Flash(void)
{
*pFlashA_PortA_Dir = 0x1;
}

//--------------------------------------------------------------------------//
// Function: Init1836()             //
//                   //
// Description: This function sets up the SPI port to configure the AD1836. //
//    The content of the array sCodec1836TxRegs is sent to the  //
//    codec.              //
//--------------------------------------------------------------------------//
void Init1836(void)
{
int i;
int j;
static unsigned char ucActive_LED = 0x01;

// write to Port A to reset AD1836
*pFlashA_PortA_Data = 0x00;

// write to Port A to enable AD1836
*pFlashA_PortA_Data = ucActive_LED;

// wait to recover from reset
for (i=0; i<0xf0000; i++) asm("nop;");

// Enable PF4
*pSPI_FLG = FLS4;
// Set baud rate SCK = HCLK/(2*SPIBAUD) SCK = 2MHz
*pSPI_BAUD = 16;
// configure spi port
// SPI DMA write, 16-bit data, MSB first, SPI Master
*pSPI_CTL = TIMOD_DMA_TX | SIZE | MSTR;

// Set up DMA5 to transmit
// Map DMA5 to SPI
*pDMA5_PERIPHERAL_MAP = 0x5000;

// Configure DMA5
// 16-bit transfers
*pDMA5_CONFIG = WDSIZE_16;
// Start address of data buffer
*pDMA5_START_ADDR = (void *)sCodec1836TxRegs;
// DMA inner loop count
*pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH;
// Inner loop address increment
*pDMA5_X_MODIFY = 2;

// enable DMAs
*pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN);
// enable spi
*pSPI_CTL = (*pSPI_CTL | SPE);

// wait until dma transfers for spi are finished
for (j=0; j<0xaff0; j++) asm("nop;");

// disable spi
*pSPI_CTL = 0x0000;
}

//--------------------------------------------------------------------------//
// Function: Init_Sport0             //
//                   //
// Description: Configure Sport0 for I2S mode, to transmit/receive data  //
//    to/from the AD1836. Configure Sport for external clocks and //
//    frame syncs.            //
//--------------------------------------------------------------------------//
void Init_Sport0(void)
{
// Sport0 receive configuration
// External CLK, External Frame sync, MSB first, Active Low
// 24-bit data, Stereo frame sync enable
*pSPORT0_RCR1 = RFSR | RCKFE;
*pSPORT0_RCR2 = SLEN_24 | RXSE | RSFSE;

// Sport0 transmit configuration
// External CLK, External Frame sync, MSB first, Active Low
// 24-bit data, Secondary side enable, Stereo frame sync enable
*pSPORT0_TCR1 = TFSR | TCKFE;
*pSPORT0_TCR2 = SLEN_24 | TXSE | TSFSE;
}

//--------------------------------------------------------------------------//
// Function: Init_DMA             //
//                   //
// Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in //
//    autobuffer mode to transmit         //
//--------------------------------------------------------------------------//
void Init_DMA(void)
{
// Set up DMA1 to receive
// Map DMA1 to Sport0 RX
*pDMA1_PERIPHERAL_MAP = 0x1000;

// Configure DMA1
// 32-bit transfers, Interrupt on completion, Autobuffer mode
*pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1;
// Start address of data buffer
*pDMA1_START_ADDR = (void *)iRxBuffer1;
// DMA inner loop count
*pDMA1_X_COUNT = 4;
// Inner loop address increment
*pDMA1_X_MODIFY = 4;


// Set up DMA2 to transmit
// Map DMA2 to Sport0 TX
*pDMA2_PERIPHERAL_MAP = 0x2000;

// Configure DMA2
// 32-bit transfers, Autobuffer mode
*pDMA2_CONFIG = WDSIZE_32 | FLOW_1;
// Start address of data buffer
*pDMA2_START_ADDR = (void *)iTxBuffer1;
// DMA inner loop count
*pDMA2_X_COUNT = 4;
// Inner loop address increment
*pDMA2_X_MODIFY = 4;
}

//--------------------------------------------------------------------------//
// Function: Enable_DMA_Sport           //
//                   //
// Description: Enable DMA1, DMA2, Sport0 TX and Sport0 RX     //
//--------------------------------------------------------------------------//
void Enable_DMA_Sport0(void)
{
// enable DMAs
*pDMA2_CONFIG = (*pDMA2_CONFIG | DMAEN);
*pDMA1_CONFIG = (*pDMA1_CONFIG | DMAEN);

// enable Sport0 TX and RX
*pSPORT0_TCR1  = (*pSPORT0_TCR1 | TSPEN);
*pSPORT0_RCR1  = (*pSPORT0_RCR1 | RSPEN);
}

//--------------------------------------------------------------------------//
// Function: Init_Interrupts            //
//                   //
// Description: Initialize Interrupt for Sport0 RX       //
//--------------------------------------------------------------------------//
void Init_Interrupts(void)
{
// Set Sport0 RX (DMA1) interrupt priority to 2 = IVG9
*pSIC_IAR0 = 0xffffffff;
*pSIC_IAR1 = 0xffffff2f;
*pSIC_IAR2 = 0xffffffff;

// assign ISRs to interrupt vectors
// Sport0 RX ISR -> IVG 9
register_handler(ik_ivg9, Sport0_RX_ISR);

// enable Sport0 RX interrupt
*pSIC_IMASK = 0x00000200;
}

我为了存储更长时间的语音，将原程序设置的int iTxBuffer1[4]，int iTxBuffer1[4]都改成了

segment("sdram0_bank1")int iTxBuffer1[240000]

segment("sdram0_bank1")int iTxBuffer1[240000]

（其他的buff也相应的改变大小了，pDMA1_X_COUNT，pDMA2_X_COUNT什么的参数都改好了）

但是最后并没有放出来长时间的语音，还是很短，我不知道是为什么，试了很多遍，代码也改了很多次，还是不成功，希望懂的人能帮我解决这个问题，如果觉得我问题描述的不清楚，也可以QQ，email联系，在此先感谢各位了