Increase delay between Radio Event and CPU cycle

RE: Increase delay between Radio Event and CPU cycle

Dave_couling — Tue, 23 Jun 2015 20:18:09 GMT

With the new S110 V8.1. It seems that I cannot enable/disable radio notifications whenever I want as this can cause an assert. I have to either have it always on or always off. Is this something that Nordic will fix in the future to allow developers to dynamically enable or disable Radio notifications anytime during a connection?

RE: Increase delay between Radio Event and CPU cycle

Locky — Tue, 03 Feb 2015 20:24:23 GMT

Thank you for this reply. I implemented my own version of ble_radio_notification.c to trigger after the end of an RF event. Using an RTC timer I create some pre-defined space before measuring the battery. Thanks for the great support Stefan!

RE: Increase delay between Radio Event and CPU cycle

Stefan Birnir Sverrisson — Mon, 02 Feb 2015 13:07:50 GMT

You can use radio notifications in order to get a guaranteed distance of an application action from a radio event. A radio notification can trigger right after a radio event or with a predefined distance before a radio event. Radio notificaitons are documented in the S110 Softdevice Specificaiton v1.3, chapter 7. Here is an radio notifications example that runs with nRF51 SDK 6.1.0

ble_app_template_with_radio_notification.zip

Yes, the voltage will drop during a radio event as the radio uses more current than anything else on the chip. The voltage will drop more if the battery has large internal resistance. Lower quality batteries usually have higher internal resistance, which creates bigger voltage drop during a radio event. The most realistic time to measure the battery voltage is actually during a radio event because then the voltage is the lowest, but as you say, then the voltage may perhaps not be very stable.