wake up the CPU

RE: wake up the CPU

syntroniks — Tue, 29 Jul 2014 19:47:24 GMT

Howdy: I've updated my question. Alternatively you can power down the whole system with your switch but I can see certain circumstances where you may not want to do that...

RE: wake up the CPU

smart — Tue, 29 Jul 2014 16:19:00 GMT

I'm trying to Switch the system off or one with a switch pin : Switch-off == 1 {system off} Switch-off == 0 {system on}

which one of the referred to wake up the system do recommand ?

thanks

RE: wake up the CPU

syntroniks — Tue, 29 Jul 2014 15:54:42 GMT

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.