请教：mcbsp+edma3乒乓操作，CCS仿真时测试都正常，但是烧写进NAND FLASH后，mcbsp的数字输出都为低电平。请教一下，这是什么原因。

请教高手：OMAPL138的DSP核负责数据采集与处理，mcbsp连接AIC23，数据采集部分直接采用mcbsp进行采集，数据发送部分采用mcbsp+edma3乒乓操作的方式，在CCS仿真时，数据采集和发送都正常，但是程序烧写进NAND FLASH后，数据采集部分正常（液晶显示的采集数据波形正常），测试数据发送的EDMA中断进入节奏正常，但是从mcbsp测试的输出数据一直保持低电平，导致AIC23没有输出波形。程序如下，请高手帮我分析一下原因，谢谢！

void McBSP0Init(void)
{
// McBSP0 串行口控制寄存器
SPCR |=(1<<13|1<<7);
SPCR &= ~(1<<23 |1<<22 | 1<<16 |1); // Disable FRST, GRST, XRST, RRST first.
// McBSP0 管脚控制寄存器
PCR = (0 << 11 | //transmit frame-synchronization signal is derived from external source, FSX is an input pin.
0 << 10 | //receive frame-synchronization signal is derived from an external source, FSR is an input pin.
0 << 9 | //CLKX is an input pin and is driven by an external clock
0 << 8 | //receive clock-CLKR is an output pin and is driven by the internal sample-rate generator
0 << 7 | //sample rate generator input clock mode bit, conjunction with CLKSM bit to select the input clock,McBSP internal input clock
0 << 3 | //transmit frame-synchronization polarity bit: active high
0 << 2 | //receive frame-synchronization pulse is active high
1 << 1 | // CLKXP TX data transmit data driven on falling edge of CLKX
1 ); // CLKRP RX data driven on RISING edge of CLKR

// McBSP0 接收控制寄存器
RCR = ( 0 << 31 | // single-phase frame
1 << 24 | //2 word in phase 2
2 << 21 | // 16 bit word in phase 2
0 << 19 | // No companding
0 << 18 | // 第一个帧脉冲重新开始传输之后，接收帧同步脉冲
1 << 16 | // 1-bit delay
1 << 8 | // 2 word in phase 1
2 << 5 | //16 bit word in phase 1
0 << 4 | // no reversal
0 );
// McBSP0 发送控制寄存器
XCR = ( 0 << 31 | // single-phase frame
1 << 24 | // 2 word in phase 2
2 << 21 | // word length is 16 bit
0 << 19 | //no companding
0 << 18 | // Ignore fs glitch
1 << 16 | //1 bit delay
1 << 8 | //2 word in phase 1
2 << 5 | //16 bit word
0 << 4 | // no reversal
0 );
//McBSP0 write FIFO control register

// 延时等待内部同步
unsigned char i;
for(i=0;i<100;i++)
asm (" nop");
//8. enable transimit and / or receive
/* SPCR |= (1 << 16 | 1); //Enable RRST, XRST
for(i=0;i<100;i++)
asm (" nop ");*/
}

发送部分ping pong paRAM 参数
static struct EDMA3CCPaRAMEntry const PingxmtPar =
{
(unsigned int)(1 << 20 | 3 << 12), // Opt set
(unsigned int)pingxmt, // 源地址
(unsigned short)(BYTES_PER_SAMPLE), // aCnt
(unsigned short)(AUDIO_BUF_SIZE), // bCnt
(unsigned int) (SOC_MCBSP_0_DATA_REGS), // 目标地址
(short) (BYTES_PER_SAMPLE), // 源 bIdx
(short)(0), // 目标 bIdx
(unsigned short)(Pongxmt_PaRAM_ID * SIZE_PARAMSET), // 链接地址 Pongxmt_PaRAM_ID
(unsigned short)(AUDIO_BUF_SIZE), // bCnt 重装值
(short)(0), // 源 cIdx
(short)(0), // 目标 cIdx
(unsigned short)1 // cCnt
};

static struct EDMA3CCPaRAMEntry const PongxmtPar =
{
(unsigned int)(1 << 20 | 3 << 12), // Opt set 
(unsigned int)pongxmt, // 源地址
(unsigned short)(BYTES_PER_SAMPLE), // aCnt
(unsigned short)(AUDIO_BUF_SIZE), // bCnt
(unsigned int) (SOC_MCBSP_0_DATA_REGS), // 目标地址
(short) (BYTES_PER_SAMPLE), // 源 bIdx
(short)(0), // 目标 bIdx
(unsigned short)(Pingxmt_PaRAM_ID * SIZE_PARAMSET), // 链接地址 Pingxmt_PaRAM_ID
(unsigned short)(AUDIO_BUF_SIZE), // bCnt 重装值
(short)(0), // 源 cIdx
(short)(0), // 目标 cIdx
(unsigned short)1 // cCnt
};

static void EDMA3ParamInit(void)
{
EDMA3CCPaRAMEntry paramSet;

memcpy(&paramSet, &PingxmtPar, SIZE_PARAMSET - 2);
EDMA3SetPaRAM(SOC_EDMA30CC_0_REGS, Pingxmt_PaRAM_ID, &paramSet);

memcpy(&paramSet, &PongxmtPar, SIZE_PARAMSET - 2);
EDMA3SetPaRAM(SOC_EDMA30CC_0_REGS, Pongxmt_PaRAM_ID, &paramSet);

memcpy(&paramSet, &PingxmtPar, SIZE_PARAMSET - 2);
EDMA3SetPaRAM(SOC_EDMA30CC_0_REGS, EDMA3_CHA_MCBSP0_TX, &paramSet);

xfreebuf = xpongbuf;
rfreebuf = rpongbuf;

}

void InitMcbspEdma(void)
{
unsigned int i;
for(i=0;i<AUDIO_BUF_SIZE;i++)
{
pingrcv[i] = 0;
pongrcv[i] = 0;
pingxmt[i] = 0;
pongxmt[i] = 0;
}
EDMA3Init(SOC_EDMA30CC_0_REGS, 0);
EDMA3IntSetup();

// 申请 EDMA 通道，通道 3 用于发送
EDMA3RequestChannel(SOC_EDMA30CC_0_REGS, EDMA3_CHANNEL_TYPE_DMA,
EDMA3_CHA_MCBSP0_TX, EDMA3_CHA_MCBSP0_TX, 0);

// 初始化 DMA 参数
EDMA3ParamInit();
//初始化 McBSP0 参数
McBSP0Init();
// 使能 EDMA 传输
EDMA3EnableTransfer(SOC_EDMA30CC_0_REGS, EDMA3_CHA_MCBSP0_TX,
EDMA3_TRIG_MODE_EVENT);
// 使能 接收// 使能 发送
SPCR |= (1 << 16 | 1); //Enable RRST, XRST

for(i=0;i<100;i++)
asm (" nop ");
}

static void EDMA3CCComplIsr(void)
{

IntEventClear(SYS_INT_EDMA3_0_CC0_INT1);

// GPIOPinWrite(SOC_GPIO_0_REGS, 102, 0);

// 判断发送 DMA 完成
if(EDMA3GetIntrStatus(SOC_EDMA30CC_0_REGS) & (1 << EDMA3_CHA_MCBSP0_TX))
{
// 清除 3 通道中断标志
EDMA3ClrIntr(SOC_EDMA30CC_0_REGS, EDMA3_CHA_MCBSP0_TX);

if(xfreebuf == xpingbuf)
xfreebuf = xpongbuf;

else

xfreebuf = xpingbuf;

}

}