About nRF52832,enter idle mode .How long does the 52832 enter idle mode ,via calling WFI instruction.

[helen]

HI  Nordic Team :

     Our important customer uses  nRF52832 to develop bluetooth key product . they want to know how long the 52832 enter IDLE mode by calling WFI instruction . please confrim official this value .They measure this value about 300us.

Thanks ,look forward your reply.

[run_ar]

HI,

I am afraid I do not understand what you are asking for. Can you please elaborate?

[helen]

Hi  Run,
   I means how long time cpu from calling WFI instruction to enter idle mode .

[run_ar]

From ARM documentation:

WFI is a hint instruction that suspends execution until one of the following events occurs:

• a non-masked interrupt occurs and is taken

• an interrupt masked by PRIMASK becomes pending

• a Debug Entry request.

Execution will be suspended when the instruction is run. Instead of using wfi I would recommend that you use the normal sev, wfe, wfe routine. More details in this thread: devzone.nordicsemi.com/.../how-do-you-put-the-nrf51822-chip-to-sleep