__WFI does not come back at interrupts when using WLCSP

[mraposo1]

With my sparkfun 52832 board, when I use the __WFI instruction and I set my device to generate interrupts on P04, the code returns when an interrupt is generated.
With the 52832 WLCSP (internal LDO configuration) it gets stuck at the __WFI instruction even when an interrupt happens. 
Is there a reason for it?
Is this a normal behavior?
Do I need to configure anything special?

[Kenneth]

Hi,

Internally the die is identical, it's only the pin out/package that is different.

There is various reason why __WFI() may not work, and there are online discussion on '__wfi vs. __fwe arm' (for instance the interrupt may already have occured when you call wfi). My suggestion is to replace __WFI() with:

// Clear event
__SEV();
__WFE();
// Wait for event
__WFE();

Best regards,
Kenneth

[mraposo1]

I will try that. But, I know for a fact that the interrupt are supposed to be detected because I use the same exact code on the non-WLCSP chip and it works.

[Kenneth]

And you have confirmed that the pins are mapped correctly, for instance by toggling all pins individually. As mentioned, the die is identical.

Best regards,
Kenneth