Hey Baptiste,
would you mind to make a note in the issue-tracker [1] ?
Cheers,
Peter
[1] https://github.com/RIOT-OS/RIOT/wiki/Board%3A-Samr21-xpro
Am 04.12.2014 um 16:34 schrieb Baptiste Clenet:
Thanks for the answer.
I'm going to implement RNG for the SAMR21 then.
Ok for the RTC.
How about the Energy Saving (MCU) for the SAMR21?
Cheers,
Baptiste
2014-12-04 9:58 GMT+01:00 Ludwig Ortmann <[email protected]
<mailto:[email protected]>>:
Hi,
On Thu, Dec 04, 2014 at 09:07:31AM +0100, Baptiste Clenet wrote:
> I've got some questions about the implementation of RIOT on the
SAMR21:
>
> - RNG: There is no HW module in samd21 but the transceiver
at86rf233
> provides one (see 40.2 in datasheet). Should we implement it anyway?
Yes, the source for random data is up to the platform. As long as it's
documented it can even be an unconnected pin of the CPU.
> - What's the difference between RTT (Real Time Timer) and RTC
(Real Time
> Counter) for the SAMR21?
From the RIOT documentation of the RTC interface:
"Low-level RTC (Real Time Clock) peripheral driver."
The RTC is intended to count calendar time, not system time. Therefore
it is treated differently from other timers. Refer to the R21
datasheet chapter 17. for details.
Cheers, Ludwig
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