power consumption in Idle

[ran]

Hi, 

We are starting to measure the power of our nrf52840 based design.

I'd like to establish the power number for Idle() , since system will be in Idle() most of the time. 

For that , I have used the following code, invoked from CLI : 

__disable_irq();
sd_app_evt_wait();

1. Is this code correct for keeping system in Idle() ? 

2. What Is the estimated nrf52840 SoC current consumption in this mode ?  

3. Our code is based on UART example

Thanks, 

Ran

[Simonr]

Hi Ran

Are you using FreeRTOS? If not you won't have to worry about this. In any case, this is an issue in a few build codes of the nRF52832, so seeing as you use an nRF52840 this should not apply in any case.

You should not have to configure SPI/I2C when your device stays in system ON mode. Also, why would you have to disable interrupts to go to idle mode?

Best regards,

Simon

[ran]

Simon 

I am using embOS (by Segger) with tickless impl. (ported from freetos example) 

I have disabled interrupt before Idle for test purposes only - So HW guys can measure the "floor" . ( I've added a "sleep" command to our CLI ) 

Also, I've noticed that in "freetos" examples, the following line is being used  :

"SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk"  ( set Cortex-M0 sleep mode ) . 

But it is not used in any non-freetos example ? why is that ?