The system wakes up 1 second after pressing the button. What can I do to reduce this time?

Question

Hi, 
 I use sd system power off to go into sleep mode. I wake up with the help of a button. However, the 1 second wake up time is too much for us. Do we have a chance to set this one-second wake up time? Our system (BLE) also works.

Simonr · Accepted Answer

Hi 
 How do you measure the wake up time? If you have delays during your initiailization phase, for example, this will affect the wake up time for instance. Please try to find out what exactly is taking most of the time? 
 The 32kHz external crystal will take several hundred milliseconds to start up, but it shouldn't result in a full second. An alternative would be to use another clock source for the LF clock but that will result in higher current consumption while the LF clock is running. 
 Best regards, 
 Simon

HasanYilmaz · Answer

I solved this situation. After the BLE_STACK_INIT function sensor_function (); I was calling the function. When I moved this program to the first line in main with some fixes, I did not have any problems. But I will try the clock thing you said :) Even a few hundred milliseconds is very important to us :) Thank you, Simonr.

The system wakes up 1 second after pressing the button. What can I do to reduce this time?

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