Hi
I would like to know a bit more of the state-machines RTnet has been built. Going through the codes, I am not sure whether what i have realised it correctly or not, but please do direct me as i go along. btw this is TDMA v1 i am referring to (to start with).
for the master
what is it that the SOF (start-of-frame) is built up of?, and is suppose to do. To my understanding of Master/slave real-time networking, it is for the global synchronisation event of a new cycle (round). Another purpose is for some sort of current configuration acknowledgement, though this part should have been noted in stage 2 configuration does it have any more other purposes ?
In tdma_task_master function of tdma_task.c file, it shows, after sending the SOF packet it performs a sem_broadcast, what is this intended for ? the kind of RT task required to be unblocked ? followed by dequeue client skb. what kind of packet are their to dequeue ?
for client..
upon on calling of the function
ioctl_rt(tdma, RTMAC_RTIOC_WAITONCYCLE, ..), does this wait till the next fresh cycle before it releases the lock or the closest available cycle?
what is the meaning of heartbeat? for synchronisation purposes?
in the tdma_task_client function of tdma_task.c file, the loop performs a
rtos_event_wait, which blocks until some process release the lock. How does this process relate to the sending of heart beat and ioctl_rt for RTMAC_RTIOC_WAITONCYCLE ? I am assuming it also calculates the next tdma->wakeup time so it may wait till its time to transmit packet across the network after unblock.
Sorry about all these stupid questions, but I am just rather curious how RTnet manages its protocols
Thanks Bret
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