Attending

• @Titan Yuan

• @Jove Yuan

• @Kristofer PISTER

• @Thomas Watteyne [remote]

• @Tengfei Chang [remote]

Action Items

• @Titan Yuan to confirm that the error on the temperature measurement is indeed that good.

Minutes

• @Titan Yuan BLE RX

  • not sure whether picks up BLE packets or something

  • discussion about addressing used, advertisement address and access address

  • access address is the only address not scambled, ADV address is

  • outstanding questions to @Brad Wheeler

• @Titan Yuan Flexboard

  • @Fil Maksimovic made them last week

  • they are fragile but some work

  • LC frequency calibration works

  • TODO: 2-point temperature calibration

  • no UART

• @Titan Yuan temperature averaging

  • how many temperature samples are needed to average over?

  • sample every 100ms

  • don’t see a huge benefit in averaging over more than 10-20 samples

  • @Kristofer PISTER : discussion about Alan variance, agrees

  • TODO: @Titan Yuan to confirm that the error on the temperature measurement is indeed that good.

• @Titan Yuan

  • tried to perform TC frequency cal with RF timer

  • @Kristofer PISTER looks like a single calibration would hold in a 20 C range

  • LC linear with fine code, ratio between two counters is linear with temperature

• @Tengfei Chang

  • describes the freqeuency sweep tests

  • question: is there a relationship between TX and RX settings?

  • there doesn’t seem to be a relationship between TX and RX

  • @Kristofer PISTER is taking the average of the settings the right thing to do?

  • @Kristofer PISTER does crossing a mid setting impact the result?

  • @Kristofer PISTER the state of the divider should impact teh frequency

  • @Tengfei Chang to repeat both with divider on/off and see the delta that we get

  • @Kristofer PISTER key questions about LC monotonic, if the mid-code delta is reasonably constant, you can make more sense of mapping delta’s between TX and RX

  • @Tengfei Chang to plot zoomed in version of the same data, over only a single coarse setting

• @Thomas Watteyne

  • Introduce the QuickCal algorithm

  • @Thomas Watteyne The QuickCal algorithm takes under 30 seconds to obtain all the Tx and Rx frequency settings on 16 channels. Using standardized TSCH network takes 1hour. We need standardize the QuickCal.

• @Titan Yuan is that true there is no relationship between frequency settings for Tx and Rx?

• @Kristofer PISTER There is, but maybe not straightforward relationship between them.