wake up the CPU

Question

hello, 
 could anyone tell me how to wake up the CPU after a sd_power_system_off () ? 
 Thanks.

syntroniks · Accepted Answer

Yes, one way is to configure a GPIO pin for wakeup. This is demonstrated in nordic sample applications. They generally go to system off after the long advertising timeout. 
 Reset sources like power-on reset will also bring a device out of system off. 
 
 After learning more about your application, I'd like to recommend this approach to you: 
 Register your switch/button with the app_button module and when you detect a low to high transition, go into system_off. Before that, run this code:
// Configure switch with sense level low as wakeup source.
nrf_gpio_cfg_sense_input(YOUR_PIN_NUMBER, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_LOW); 
 When the switch level goes back to low, you leave system_off and begin executing code @ the top of main(); Let me know if you have any other concerns.

wake up the CPU

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