how 528323 reduce power consumes with freertos ?

[chenzp531]

Hi Nordic, 

we use the demo  "ble_app_hrs_freertos"  (nRF52832, SDK13.0)

I'm trying to get it into low power (system on mode) , and the idle task keep on running and the system consumes ~15uA constantly 

but we whise the consumes <2uA, how to reduce the power consumes?

we have other app,whitch consumes is <2uA (nRF52832, SDK12.2), but without freertos

thank you

[Jørgen Holmefjord]

Hi,

Are you running any timers or tasks that will generate interrupts? If you are seeing ~15 uA current, the CPU is sleeping and there is some other peripheral running that is consuming the additional current. Are you testing this on a nRF52 DK, or on a custom board? Have you tried updating to the latest SDK (v15.2.0) and the FreeRTOS version available there? There might be some bug-fixes included.

Best regards,
Jørgen

[chenzp531]

HI

Thanks for the reply.I use the SDK13.0,shield the sd_power_system_off() in the sleep_mode_enter(),and shield  the application_timers_start(),when into the BLE_ADV_EVT_IDLE event,the system consumes is15uA.There are other tasks running?

[Jørgen Holmefjord]

What do you mean by this?

chenzp531 said:

shield the sd_power_system_off() in the sleep_mode_enter(),and shield  the application_timers_start()

If you enter system off mode, the current should be low ~400 nA. If you run app_timer(s) and do BLE advertising, an average current of 15 uA could be correct. Try disabling parts of your application to see if you are able to reduce the current consumption.