[OneRNG-Discuss] LED frequently going dark for various lengths of time
tmp543901 at buckeye-express.com
Fri Sep 16 01:36:54 BST 2022
On 7/26/22 15:10, Paul Campbell wrote:
> On Wednesday, 27 July 2022 7:16:08 AM NZST bsr wrote:
>> I'm having an issue with one of my OneRNG units. For the past few
>> months I have observed the LED occasionally going dark. When I first
>> started to notice it would be dark about 3-4 seconds but lately the
>> duration is sometimes longer (10 seconds) and the frequency of
>> occurrence has increased as well. My issue seems very similar as
>> described in a previous discussion, except Hans was using v1 hardware
>> and mine is v3 -
> there is/was a firmware bug I found a while back that did cause behavior like
> this - there's a fix for it (not a firmware update) in the last couple of
> software releases
I meant to post this a long time ago... but here is what I found.
I had my onerng config set to cmd3 operation (raw avalanche plus RF - no
whitening) and was experiencing the behavior I described. Switching to
cmd0 (default) my ONeRNG functions normal.
Checking with a scope when set to cmd3 operation, I didn't notice any
change in the waveform at T3 as the light would go dark. It was hard to
catch but I did get a couple of direct device dumps via dd that showed
some really strange data.
I posted one of those dumps here:
The spamming of zero in the output stream seems to hit around offset
0x340 and seems to resolve around 0x1838. Since I didn't notice any
change on T3 (using cmd3) and I am not seeing this behavior using cmd0
(no RF) it seems probable that RF is somehow responsible(?). I haven't
dug deeper but could RF interference really cause such issues?
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