Re: 96boards Nitrogen

Steve Brown


On Thu, 2017-09-14 at 19:54 +0000, Chettimada, Vinayak Kariappa wrote:

Hello and blinky work. BT does not.
Ok, so the CPU and UART works :-)
And, the 32KHz clock domain works, hence the blinks.

Now, CPU can run from internal High Frequency RC or External crystal.
If your 32MHz crystal on the board has dry solder (or what ever has
happened), then most probably internal RC remains to clock the SoC.
But 2.4GHz radio will not be 2.4GHz.

Zephyr v1.9 has Radio Direct Test Mode implementation, hci_uart
sample can be used with DTM HCI commands to test the radio. The DTM
HCI commands will fail to respond if the HF clock cannot source from
a stable crystal.

And, yes nitrogen_beacon.hex from
itrogen/zephyr-1.8/ flashed to the nano2 advertises. There's no
output as I explained previously.

I'm now more convinced that the devices somehow got damaged in
from Seeed. 
Very unlikely (and likely based on conditions), I use nRF51 dongles
over 5 years now, carry it around in bare hands, worst I have done is
to have my 32KHz crystal go out of its spec. but BLE operational
using the 32KHz RC.

I'll report when I get the ones I ordered from Digikey. I expect
to work just fine.

If you are curious about what happened to the radios, I'd be glad
send you the 2 I got from Seeed.
I think Seeed need to contact our support (I am just a software guy).

The shipment didn't seem to have been opened. I'm pretty ESD
at my end.

I found tests/bluetooth/shell. I also found my wispy toy spec analyzer.

With "scan on", I receive advertisements. So, the 32Mhz xtal is ok.
With "advertise on", I observe rf on 3 freq's. The wispy doesn't seem
to calibrate properly, so I don't know the exact freqs, but they are
the same as the nano2. The difference is that "hcitool lescan" receives
the nano2 advertisements, but nothing from the nitrogen.

Next, I will try to see what is actually on the air. I'll also try to
get accurate freqs for the advertisements.

Any ideas?


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