Using RTC to create a delay that sleeps while waiting

RE: Using RTC to create a delay that sleeps while waiting

matt_C — Tue, 28 Jan 2020 14:02:12 GMT

I am using cystic timer. The code I posted is a small edited subset of the whole body of code.

RE: Using RTC to create a delay that sleeps while waiting

WestCoastDaz — Mon, 27 Jan 2020 22:55:21 GMT

The power profiler provides a very detailed view of the power draw in time and graphs this for you.

Outside of that I noticed that you have this statement SysTick_Config( SystemCoreClock / 1000 ); Are you using the Systick timer?

RE: Using RTC to create a delay that sleeps while waiting

matt_C — Sat, 25 Jan 2020 00:00:11 GMT

I am fairly certain that my method of power consumption measurement is solid.

The method of current consumption I am using is to charge a large capacitor, power our device using it for a set period of time, and then measuring how much capacitor voltage has dropped. From this I calculate the current consumed so that I get a good average current consumption including time sleeping.

Is there anything that the power profiler could tell me of my total power consumption that this method will not?

From power measurements done before trying to implement this RTC delay with sleep I was using ~3x less current.

This new RTC delay with sleep was added to allow me to wait for a specific sensor measurement to complete. Previously I just used the RTC to trigger tasks and the main loop went to sleep.

RE: Using RTC to create a delay that sleeps while waiting

Jay Tyzzer — Fri, 24 Jan 2020 23:36:39 GMT

I suggest you acquire a Nordic power profiler for accurate power measurements.

RE: Using RTC to create a delay that sleeps while waiting

matt_C — Fri, 24 Jan 2020 23:34:30 GMT

No debugger was attached during the measurement.

RE: Using RTC to create a delay that sleeps while waiting

WestCoastDaz — Fri, 24 Jan 2020 22:43:35 GMT

Did you have a debugger connected during the measurement? Having one connected will greatly increase the power consumption since parts of the SoC aren't shutdown.

RE: Using RTC to create a delay that sleeps while waiting

matt_C — Thu, 23 Jan 2020 17:09:24 GMT

I have enabled the soft device. I did a power consumption measurement using capacitor discharge and the usage was dramatically higher than it should be if it was successfully sleeping. The power usage was only slightly less than using nrf_delay_ms(delay_ms) for the delay.

RE: Using RTC to create a delay that sleeps while waiting

WestCoastDaz — Thu, 23 Jan 2020 17:02:51 GMT

How do you know the device doesn’t enter sleep? Also I noticed a call to BLEInit() you have enabled the SoftDevice correct?