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Power consumption on FreeRTOS with SDK 15.3

Shang Ting

Hardware: PCA10040, PPK

SDK: nRF5_SDK_15.3.0_59ac345

I test hrs app and get these number in current consumption during advertising. No modification on example projects. 

ble_app_hrs_freertos_pca10040_s132: 8.3mA

ble_app_hrs_pca10040_s132: 1.2mA

I want to use FreeRTOS. How do I get minimal current consumption with it?

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  • 0

    Hi

    Are you sure you're looking at the average current consumption for both applications? The FreeRTOS application is expected to run at ~50-100µA more than the "regular" example due to FreeRTOS bookkeeping, etc. 

    If you zoom out in the power profiler app, the average current should be a lot more similar. I just tested it here and the ble_app_hrs example runs at an average of ~400µA, while the ble_app_hrs_freertos example runs at an average of ~500µA which is expected.

    Best regards,

    Simon

Reply
  • 0

    Hi

    Are you sure you're looking at the average current consumption for both applications? The FreeRTOS application is expected to run at ~50-100µA more than the "regular" example due to FreeRTOS bookkeeping, etc. 

    If you zoom out in the power profiler app, the average current should be a lot more similar. I just tested it here and the ble_app_hrs example runs at an average of ~400µA, while the ble_app_hrs_freertos example runs at an average of ~500µA which is expected.

    Best regards,

    Simon

Children
  • 0 in reply to Simonr

    I retest the boards and got the following result:

    pca10040(1.2.4):

    ble_app_hrs_freertos_pca10040_s132: 521 uA

    ble_app_hrs_pca10040_s132:  571 uA

    pca10056(1.1.0):

    ble_app_hrs_freertos_pca10056_s140: 6.1 mA

    ble_app_hrs_pca10056_s140: 3 mA

    Build with the following changes in sdk_config.h:

    NRF_LOG_BACKEND_RTT_ENABLED 1
NRF_LOG_BACKEND_UART_ENABLED 0
NRF_FPRINTF_FLAG_AUTOMATIC_CR_ON_LF_ENABLED 0

    Firmware is built by SES.

    Use external supply pin to supply power. No other USB/Jlink connection.

    Current consumption of pca10040 is normal now. However, pca10056 still has very high current consumption. Any advise?

    ble_app_hrs_freertos_pca10040_s132

    ble_app_hrs_pca10040_s132

    ble_app_hrs_freertos_pca10056_s140

    ble_app_hrs_pca10056_s140

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