Closed GoogleCodeExporter closed 9 years ago
I've solved this mystery. It all comes down to simply having to wait a lot
longer for the ref. voltage to stabalise before you get accurate reads -- and
it's considerably slower on the 2560/1 than the 64A chip, which is what caused
most the original grief.
The times involved were alarming -- but since the real-world speed at which the
8 ADC plus 1 Vref have to sampled does not in fact need to be any quicker than
the minimum time it takes to shuffle 8 PPM pulses out to the TX module, it
actually doesn't seem to matter or have and bad effect on overall performance.
Since having the feature in the first place makes for a safer radio, I figure
it should be kept.
That said, we've now included an external and thus permanently on and stable
voltage reference for the V4+ boards. So this issue will be a thing of the
past, soon enough.
Original comment by gru...@gmail.com
on 22 Aug 2011 at 10:57
UPDATE: Cam's new V4.0 board is having BG instability with the 300us delay,
which works good for me. I've increased the delay to 400us for him to test. I
am happy with any delay up to about 1ms. Beyond that and I'll get really
annoyed with Atmel's poor design. :P
NOTE: In fact, the V4 board has its own external voltage reference, so this
problem will vanish completely. But for now, I want to know where it's at with
the internal bandgap reference.
[Status reverted from Fixed to Started]
Original comment by gru...@gmail.com
on 23 Sep 2011 at 2:03
We don't care any more about the 2561. The V4 board has it's own external
voltage reference, which has nail the lid shut tightly on this annoyance,
permanently.
Original comment by gru...@gmail.com
on 8 Oct 2011 at 9:52
Original issue reported on code.google.com by
gru...@gmail.com
on 12 Jul 2011 at 1:30