RTC timer is shiffting after connection/disconnetion

RE: RTC timer is shiffting after connection/disconnetion

Sébastien Despont — Tue, 01 Oct 2013 05:43:59 GMT

Keep in touch if you find something

RE: RTC timer is shiffting after connection/disconnetion

Sébastien Despont — Tue, 01 Oct 2013 05:43:41 GMT

Hi,

Really sorry, but I can't help you because this problem still exists on our side. I always as in my todo list a 32kHz precision measurment that you ca do like this : https://devzone.nordicsemi.com/index.php/lfclk-32khz-on-a-gpio-pin-for-precision-measurement

RE: RTC timer is shiffting after connection/disconnetion

Sami Pekkanen — Tue, 01 Oct 2013 05:21:34 GMT

Hi,

I have same kind of problem. I receive all interrupts only when I have connection ongoing. Without connection I lost 40% of interrupts.

What was reason in your cases?

Br, Sami

RE: RTC timer is shiffting after connection/disconnetion

Audun — Wed, 28 Aug 2013 12:02:58 GMT

No problem :) I suggest you use toggle two different GPIOs, one in the interrupt handler and one using PPI. If the PPI-triggered GPIO toggles but the IRQ-triggered one does not toggle you know there is something delaying the IRQHandler

RE: RTC timer is shiffting after connection/disconnetion

Sébastien Despont — Wed, 28 Aug 2013 11:57:22 GMT

Hi Audun,

For you for your effort! I am going to map 32kHz on a GPIO pin and check with oscillator like you.

Best regards

RE: RTC timer is shiffting after connection/disconnetion

Audun — Wed, 28 Aug 2013 11:53:18 GMT

Hi Sebastien,

the RTC timer itself is not stopped when connecting/disconnecting, but interrupts can be delayed for a couple of ms due to SoftDevice radio interrupts when connected. This should not influence your timekeeping however, as the timescale is much larger than radio interrupts.

I ran a test toggling an IO from the RTC1_IRQHandler while connecting/disconnecting, but I could not see similar behavior as you are describing. Are you sure you are not doing anything when connect/disconnect events happen? Maybe some other task is blocking the RTC1_IRQHandler from executing.

RE: RTC timer is shiffting after connection/disconnetion

Sébastien Despont — Wed, 28 Aug 2013 08:47:07 GMT

Hi Audun,

Thanks for taking the time to read my question. I am using an external 32kHz clock.

Do not hesitate to contact me if you need more information.

RE: RTC timer is shiffting after connection/disconnetion

Audun — Wed, 28 Aug 2013 06:35:09 GMT

Are you using an external 32 kHz crystal or the internal RC?