Just one more thing i noticed and could also cause problems:
If Cycle_Number overflow number would be changed by the master, then this
should be somehow reported to a slave, because during the Calibration Phase,
the slave has to set/define the Reply_Cycle_Number in the
Request_Calibration_Frame. The slave should not define the Reply_Cycle_Number
which is higher than the Cycle_Number overflow number.
Regards
Klemen
On Friday, January 3, 2014 4:26 PM, Jan Kiszka <jan.kis...@web.de> wrote:
On 2014-01-03 16:10, Klemen Dovrtel wrote:
> Can you change the number used by the master to overflow the Cycle Number.
> The number 4.151.347.200 is very close to 2^32 (which is the maximum Cycle
> Number) and suits to all phasing/period defined by 4 bits (16 in decimal).
Then we also need to restrict period to <= 16, rejecting other values.
Some automatic calculation of the overflow number + a rejection of
configurations where this becomes >= 2^32 would be nicer.
Jan
> On Friday, January 3, 2014 12:22 PM, Jan Kiszka <jan.kis...@web.de> wrote:
>
> On 2013-12-12 21:13, Klemen Dovrtel wrote:
>
>> Hello everybody,
>>
>> I am studding rtnet documentation and i am not sure of Rtnet slave <phasing>
>> and <period> setup.
>>
>> How does the slave knows it is his turn to send data? I assume all the
>> informations should be in the Synchronisation Frame -> Cycle Number field
>> which is incremented by one in every new cycle, and it is reset to zero on
>> overflow. What i am not sure is when does it overflow? I would suspect that
>> the overflow number is set in a way that the (overflow_number+1) can be
>> divided by all period numbers in the tdma.conf file without a reminder.
>> Otherwise the slave slots can not be evenly distributed. I could not find
>> any information about this.
>>
>
> Good point! This is not taken into account by the implementation. So if
> the configuration contains non-power-of-two periods, it will face
> skipped slots on wrap-around of the 32-bit cycle counter.
>
> Jan
>
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