void init_ppi(void)

{

    *pPPI_CONTROL = 0x3800 |  0x000C ;  //PPI接收模式  Data Length 16bits,

    //*pPPI_DELAY   = 0x0001;

    *pPPI_DELAY   = 0x0;     //0 clock delay after FS assertion

    

*pPPI_COUNT   = RECEIVE_BUFFER_SIZE+1;// (512*100)

    //*pPPI_COUNT   = RECEIVE_BUFFER_SIZE;

*pPPI_FRAME   = 0x0000;

    

   //initialize the DMA channel for PPI

  

  

   //last_word_pointer   =   *last_word_pointer;  

  

*pDMA0_CONFIG =  0x0020 | WDSIZE_16 | WNR | DI_EN;  //WNR表示存储器写

short *receive_pointer;

receive_pointer = sPPI_RxBuffer1+(RECEIVE_BUFFER_SIZE)*stored_data_times+8+data_left_length/2;

//receive;

*pDMA0_START_ADDR   = (void*)(receive_pointer);

*pDMA0_X_MODIFY = 2;

*pDMA0_X_COUNT = RECEIVE_BUFFER_SIZE+1;

//*pDMA0_X_COUNT = RECEIVE_BUFFER_SIZE;

asm("ssync;");

}

void start_ppi(void)

{

*pDMA0_CONFIG = *pDMA0_CONFIG | DMAEN ;

asm("ssync;");

*pPPI_CONTROL = *pPPI_CONTROL | PORT_EN;

asm("ssync;");

}