TMS320F28379D: No signal output from SPIASIMO

Part Number: TMS320F28379D
Other Parts Discussed in Thread: C2000WARE

My launchpad is C2000LaunchPad XL TMS28379D VER:2.0

I configure GPIO58~61 as SPIA's GPIO without FIFO and interrupt 

I can ensure that GPIO58~61 can run in right function because I used to configure them as common GPIO and blink external led right

I debug example :C2000Ware_4_00_00_00\device_support\f2837xd\examples\cpu1\spi_loopback_interrupts and spi_loopback_dma. They even have no signal from SPICLK!!!!

Here is my code:

void SPI_Init(void)
{
    //GPIO58
    GpioCtrlRegs.GPBGMUX2.bit.GPIO58=3;
    GpioCtrlRegs.GPBMUX2.bit.GPIO58=3;
    GpioCtrlRegs.GPBDIR.bit.GPIO58=1;
    GpioCtrlRegs.GPBPUD.bit.GPIO58=0;
    GpioCtrlRegs.GPBODR.bit.GPIO58=1;
    //GPIO59
    GpioCtrlRegs.GPBGMUX2.bit.GPIO59=3;
    GpioCtrlRegs.GPBMUX2.bit.GPIO59=3;
    GpioCtrlRegs.GPBDIR.bit.GPIO59=0;
    GpioCtrlRegs.GPBPUD.bit.GPIO59=0;
    //GPIO60
    GpioCtrlRegs.GPBGMUX2.bit.GPIO60=3;
    GpioCtrlRegs.GPBMUX2.bit.GPIO60=3;
    GpioCtrlRegs.GPBDIR.bit.GPIO60=1;
    GpioCtrlRegs.GPBPUD.bit.GPIO60=0;
    GpioCtrlRegs.GPBODR.bit.GPIO60=1;
    //GPIO61
    GpioCtrlRegs.GPBGMUX2.bit.GPIO61=3;
    GpioCtrlRegs.GPBMUX2.bit.GPIO61=3;
    GpioCtrlRegs.GPBDIR.bit.GPIO61=1;
    GpioCtrlRegs.GPBPUD.bit.GPIO61=0;
    GpioCtrlRegs.GPBODR.bit.GPIO61=1;


    SpiaRegs.SPICCR.bit.SPISWRESET=0;
    SpiaRegs.SPICCR.bit.CLKPOLARITY=0;
    SpiaRegs.SPICCR.bit.SPICHAR=7;
    SpiaRegs.SPICTL.bit.CLK_PHASE=0;
    SpiaRegs.SPICTL.bit.MASTER_SLAVE=1;
    SpiaRegs.SPICTL.bit.TALK=1;
    SpiaRegs.SPIBRR.bit.SPI_BIT_RATE=99;
    SpiaRegs.SPICCR.bit.SPISWRESET=1;

}

unsigned char SPI_WriteRead(unsigned char in)
{
    SpiaRegs.SPITXBUF=in;
    while(SpiaRegs.SPISTS.bit.INT_FLAG!=1);
    return SpiaRegs.SPIRXBUF;
}

void main(void)
{
//
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the F2837xD_SysCtrl.c file.
//
   InitSysCtrl();

#ifdef _STANDALONE
#ifdef _FLASH
//
// Send boot command to allow the CPU2 application to begin execution
//
IPCBootCPU2(C1C2_BROM_BOOTMODE_BOOT_FROM_FLASH);
#else
//
// Send boot command to allow the CPU2 application to begin execution
//
IPCBootCPU2(C1C2_BROM_BOOTMODE_BOOT_FROM_RAM);
#endif
#endif

//
// Call Flash Initialization to setup flash waitstates
// This function must reside in RAM
//
#ifdef _FLASH
   InitFlash();
#endif

//
// Step 2. Initialize GPIO:
// This example function is found in the F2837xD_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
//
    InitGpio(); // Skipped for this example
    InitPieCtrl();
    InitPieVectTable();
    EALLOW;
//    SCIB_GPIO18_GPIO19_Init();
//    PWM_Init();
    SPI_Init();

//
// TODO Add code to allow configuration of GPADIR from CPU02 using IPC
//
    EDIS;


//
// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
//
    DINT;

//
// Initialize the PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the F2837xD_PieCtrl.c file.
//
//    InitPieCtrl();

//
// Disable CPU interrupts and clear all CPU interrupt flags:
//
//    IER = 0x100;
    IER = 0x0000;
//    IFR = 0x0000;

//
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in F2837xD_DefaultIsr.c.
// This function is found in F2837xD_PieVect.c.
//
//    InitPieVectTable();

//
// Enable global Interrupts and higher priority real-time debug events:
//
    EINT;  // Enable Global interrupt INTM
    ERTM;  // Enable Global realtime interrupt DBGM
    char temp[6],i;
//
// Step 6. IDLE loop. Just sit and loop forever (optional):
    for(;;)
    {
        DELAY_US(1000);
        GpioDataRegs.GPBCLEAR.bit.GPIO61=1;
        SPI_WriteRead(0x02|0x80);
        for(i=0;i<6;i++)
        {
            temp[i]=SPI_WriteRead(0xff);
        }
        GpioDataRegs.GPBSET.bit.GPIO61=1;
    }
}