external signal failed to wake up the dsp from the standby

 
DINT;
DRTM;


InitSysCtrl();
 
// Make GPIO23 wakeup from HALT/STANDBY Low Power Modes
EALLOW;
GpioCtrlRegs.GPAPUD.bit.GPIO23 		= 0;    // Pull up
GpioCtrlRegs.GPAMUX2.bit.GPIO23 	= 0; 	// GPIO23 = GPIO23
GpioCtrlRegs.GPADIR.bit.GPIO23 		= 0;  	// GPIO23 = input
GpioIntRegs.GPIOLPMSEL.bit.GPIO23 	= 1;	//GPIO23 will wake the device
EDIS;

InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable()
 
EALLOW;  
PieVectTable.WAKEINT = &DSP_WAKEUP_ISR;
EDIS;   

IER |= M_INT1;
PieCtrlRegs.PIEIER1.bit.INTx8 = 1;
PieCtrlRegs.PIEACK.bit.ACK1 = 1;
EINT;  
ERTM;   
SysCtrlRegs.LPMCR0.bit.QUALSTDBY = 2;	

EALLOW;
if (SysCtrlRegs.PLLSTS.bit.MCLKSTS != 1) 
{
      SysCtrlRegs.LPMCR0.bit.LPM = 0x0001;  
}
EDIS;

asm(" IDLE");                           // Device waits in IDLE until falling edge on GPIO0/XNMI pin




/* ----------------------------------------------- */
/* ISR for WAKEINT     */
/* ------------------------------------------------*/
interrupt void DSP_WAKEUP_ISR(void)
{
    DINT;
    DRTM;
    myfunct; // to pull the gpio from low to high
    EnableDog();  
    PieCtrlRegs.PIEIER1.bit.INTx8 = 0;
    IER |= M_INT1 | M_INT14;// Enable CPU interrupts which is connected to CPU-Timer 0 and CPU-Timer2
    SetDBGIER(M_INT1 | M_INT14);// Want to enable INT1 and INT14 in the DBGIER. Real-time debug events.
    EINT;   // Enable Global interrupt INTM
    ERTM;   // Enable Global realtime interrupt DBGM   
}