Low power problem

[artis]

Hi,

I am having some trouble getting my design into low power.

I have a BLE central application using an nRF51822. I am using the power on sleep mode by calling sd_app_evt_wait() from an eternal loop in main(). I am using SDK 12.1.0. At power on, the sw will bring the system up and after a timeout of 10 seconds, it will be brought down doing some 'un'initializations.

I have a situation where the low power state is entered (I=2.5 uA, measured on the processor), however when I start using PWM (app_pwm_init(), app_pwm_enable(), TIMER1), I can not get the system back into low power. It will still use I=290 uA.

Does anyone know how I can uninitialize the PWM functionality in order to enter low power?

Thanks.

[FormerMember]

To go back to low power mode, you can use app_pwm_disable(..).

[artis]

Thanks for your reply and maybe I should have mentioned it, but I tried already calls like:

• app_pwm_disable()
• app_pwm_uninit()
• nrf_gpio_input_disconnect(PWM_PIN);
• NRF_TIMER1->TASKS_SHUTDOWN = 1;
• NRF_TIMER1->TASKS_STOP = 1;

They did not help.

[FormerMember]

It looks like a PAN workaround has been removed in SDK 12.1.0. This post shows what should be added in app_pwm_disable(..)

[artis]

Thanks. That was the solution. I did check the 12.2.0 release and I noticed the PAN workaround difference and I applied the patch, but .... I apparently copied the statement from the app_pwm_enable() instead of the statement from the app_pwm_disable(). But it works now.