Problem Wake-up in LPM4.5 MSP430F5438A

I try to implement the LMP4.5 sleeping mode, but I have some difficult to wake-up my device.

My source code is to go to sleep:

watchdog_stop();
P1DIR=P2DIR=P3DIR=P4DIR=P5DIR=P6DIR=P7DIR=P8DIR=P9DIR=P10DIR=P11DIR=PJDIR=0;
P1OUT=P2OUT=P3OUT=P4OUT=P5OUT=P6OUT=P7OUT=P8OUT=P9OUT=P10OUT=P11OUT=PJOUT=0;
P1REN=P2REN=P3REN=P4REN=P5REN=P6REN=P7REN=P8REN=P9REN=P10REN=P11REN=PJREN=0xff;
TA0CTL=0;TA1CTL=0;TB0CTL=0;	// clear all timer

// declare P1.2 as interrupt pin to wake up
P1DIR&=~0x04;P1OUT=0x04;
P1REN|=0x04;
P1IFG=0;
P1IE|=0x04;
// Disable SVS
PMMCTL0_H = PMMPW_H;                  // PMM Password
//this turns off the PMM to allow for LPM4.5
PMMCTL0_L |= PMMREGOFF;
// set Flag to enter LPM4.5 with LPM4 request
_BIS_SR(GIE | LPM4_bits ); // LPM4.5 sleep

and to wake-up:

main(int argc, char **argv)
{
WDTCTL = WDTPW + WDTHOLD;
short wake;
unsigned int i = 0x1000;
switch (SYSRSTIV){	// LPM4.5 wake up
case 8:
	while(i--);
	wake = 1;
	while (wake);// SW trap for debugger..
	PMMCTL0_H = PMMPW_H;                      // open PMM
	// 	 PM5CTL0 &= ~LOCKIO;
	PMMCTL0_H = 0x00;                         // close PMM
	// Clear pending interrupts
	P2IFG = 0;
	while (wake);
break;
}

But it seems my device can't wake up even after a toggling on P1.2 or a reset. In this mode, I can't debug anymore the device. 

Other question:

I follow without success the slaa424.pdf documentation to debug the LPM4.5 . It seems there is a code source sample but I don't have it. Where I can find it?

best regards,

Mathieu