TMS570LS12x MibSPI的DMA功能怎么使用？

参照了别的Hercules MCU的例子，写了一个demo，不起作用，不知道问题在哪！

/* USER CODE BEGIN (0) */
/* USER CODE END */

/* Include Files */

#include "sys_common.h"

DMA.rar

/* USER CODE BEGIN (1) */
#include <mibspi.h>
#include <sys_dma.h>
/* USER CODE END */

/** @fn void main(void)
*   @brief Application main function
*   @note This function is empty by default.
*
*   This function is called after startup.
*   The user can use this function to implement the application.
*/

/* USER CODE BEGIN (2) */
#define D_SIZE    64
uint16 tx_data[D_SIZE] = {0};
uint16 rx_data[D_SIZE] = {0};
g_dmaCTRL g_dmaCTRL_tx;
g_dmaCTRL g_dmaCTRL_rx;
/* USER CODE END */

int main(void)
{
/* USER CODE BEGIN (3) */
    sint32 i;

    for (i = 0; i < D_SIZE; i++)
    {
        tx_data[i] = i;
    }

    mibspiInit();
    mibspiEnableLoopback(mibspiREG1, Analog_Lbk);

    dmaEnable();

    //mibspiSetData(mibspiREG1, 0, tx_data);
    dmaReqAssign(DMA_CH0, 1u);

    g_dmaCTRL_tx.SADD = (uint32)(&tx_data);
    g_dmaCTRL_tx.DADD = (uint32)(&(mibspiRAM1->tx[0]));
    g_dmaCTRL_tx.CHCTRL = DMA_CH0;
    g_dmaCTRL_tx.FRCNT = 1u;
    g_dmaCTRL_tx.ELCNT = D_SIZE;
    g_dmaCTRL_tx.ELDOFFSET = 4u;
    g_dmaCTRL_tx.ELSOFFSET = 0u;
    g_dmaCTRL_tx.FRDOFFSET = 0u;
    g_dmaCTRL_tx.FRSOFFSET = 0u;
    g_dmaCTRL_tx.PORTASGN = 4u;
    g_dmaCTRL_tx.RDSIZE = ACCESS_16_BIT;
    g_dmaCTRL_tx.WRSIZE = ACCESS_16_BIT;
    g_dmaCTRL_tx.TTYPE = FRAME_TRANSFER;
    g_dmaCTRL_tx.ADDMODERD = ADDR_INC1;
    g_dmaCTRL_tx.ADDMODEWR = ADDR_OFFSET;
    g_dmaCTRL_tx.AUTOINIT = AUTOINIT_ON;

    dmaSetCtrlPacket(DMA_CH0, g_dmaCTRL_tx);
    dmaSetChEnable(DMA_CH0, DMA_HW);

    mibspiREG1->DMACTRL[0] |= (((1 << 4) | 0) << 16);
    mibspiREG1->DMACTRL[0] |=  0x8000C000u;
    mibspiREG1->DMACTRL[0] |=  (0 << 8) |(0 << 24);

    mibspiTransfer(mibspiREG1,0 );
    while (!(mibspiIsTransferComplete(mibspiREG1,0))) {}
    mibspiGetData(mibspiREG1, 0, rx_data);

    while (true) {}
/* USER CODE END */

    //return 0;
}