11uA to 30 uA low power pulses at 4ms intervals.

[PeterInStillwater]

SDK16

S132

nrf52832

SES / Windows 10

After much searching this site and the web in general I'm reaching out for support.

While in low-power mode I'm seeing a pulse between 11uA and 30 uA every 4ms.  I'm pretty much down in the nA range  between pulses. 

I've verified it's not environmental as another device (legacy) appears to be clean.  Hardware is identical - so I'm thinking it's in my firmware,.

GPIOS are turned off as is the ADC.

Wondering if anyone else has seen this - what peripheral on the device would operate at this interval while in low power.  

Thanks in advance for any advice,

Peter

[PeterInStillwater]

Here are some screen shots of what I'm seeing.  I mentioned the 4ms pulse above - I'm also interested in trying to understand the 100ms pulses.

Here are two one Second pulses where I wake up the timer:  Note 10-100ms pulses in between (not sure what these are either).

Below you will see 100 ms pulses with 24-four MS pulses in between.

And here is the four MS pulses.

For Reference,

Thanks again - for your support,

Peter

[ketiljo]

There's something that wakes up the CPU every 100 ms. Do you have the RTC running?

[PeterInStillwater]

Yes - That's how I'm triggering the 1 seconds pulse.  Im sure there's room for improvement there as well.  

This project is a port from the 51 to 52.  In the 51 code there are multiple references to being able to directly control the power - for example:  

    NRF_UART0->POWER  = 1; // Universal Asynchronous Receiver / Transmitter 0
    NRF_SPI0->POWER   = 1; // Serial Peripheral Interface (Master) 0
    NRF_TWI0->POWER   = 1; // Two Wire Interface (Master) 0 Note: will not work without enabling this
    NRF_SPI1->POWER   = 0; // Serial Peripheral Interface (Slave) 1
    NRF_TWI1->POWER   = 0; // Two Wire Interface (Slave) 1
    NRF_SPIS1->POWER  = 0; // Serial Peripheral Interface 0
    NRF_GPIOTE->POWER = 1; // GPIO Tasks and Events
    NRF_ADC->POWER    = 0; // Analog-to-Digital Controller
    NRF_TIMER0->POWER = 1; // Timer / Counter 0
    NRF_TIMER1->POWER = 0; // Timer / Counter 1
    NRF_TIMER2->POWER = 0; // Timer / Counter 2
    NRF_RTC0->POWER   = 1; // Real Time Counter 0
    NRF_TEMP->POWER   = 1; // Temperature Sensor
    NRF_RNG->POWER    = 1; // Random Number Generator
    NRF_ECB->POWER    = 1; // Crypto ECB
    NRF_AAR->POWER    = 1; // Accelerated Address Resolver
    NRF_CCM->POWER    = 1; // AES CCM Mode Encryption
    NRF_WDT->POWER    = 0; // Watchdog Timer
    NRF_RTC1->POWER   = 1; // Real Time Counter 1
    NRF_QDEC->POWER   = 0; // Rotary Quadrature Decoder
    NRF_LPCOMP->POWER = 0; // Low Power Comparator

I've not been able to find reference to equivalent functionality in SDK16.  In 
the NRFX structures several/most of the "POWER" member.  

Peter