I'm going to hold on to this as a backup option. I'm already using the shared memory space so that's another option but writing to PRU0's local RAM may be faster. I don't know. The monitor/control that PRU1 is doing doesn't would be just fine with a 1-second read interval I think. The three lines that PRU0 is already reading in this application require at least 3ms intervals or better.
Thanks for the good idea on this. Walter On Friday, June 11, 2021 at 1:33:05 PM UTC-4 Dennis Bieber wrote: > On Fri, 11 Jun 2021 09:44:27 -0700 (PDT), in > gmane.comp.hardware.beagleboard.user Walter Cromer > <walterc-2dFtBuzUeF/tpnmuczy8b...@public.gmane.org> wrote: > > >I can have PRU1 do all the ADC configuration including setting up steps > 1, > >2 and 3 to read three analog lines in one-shot mode while steps 4 & are > set > >up to read the other two analog lines in continous mode. I'll write data > >from steps 1, 2 and 3 into FIFO0 and 4 & 5 into FIFO1. > > > >The question is can PRU0 read FIFO0 while PRU1 might try to read FIFO1 at > >the same time? > > Given that each PRU is capable of accessing the other's data RAM (as I > recall, each PRU sees its RAM at address 0, and sees the other's RAM at > some fixed offset), I'd probably use a few words of PRU0's RAM and have > PRU1 write into that space, along with a timestamp value -- PRU0 would look > for a change in the timestamp, then grab the ADC values (allowing PRU1 to > write new values while PRU0 processes the previous set -- Or PRU0 clears > the timestamp [which is no longer a timestamp] which PRU1 sees as "okay to > write new values", PRU1 then sets the timestamp byte to tell PRU0 "okay to > read". Closest I can come to a shared semaphore/mutex (are there any > synchronization primitives in the PRU runtime?). > > > -- > Dennis L Bieber > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/78f2bd55-726a-4b03-9cf4-345d6486ec59n%40googlegroups.com.
