#linuxcnc-devel Logs

Nov 16 2018

12:41 AM linuxcnc-build: build #574 of 4031.deb-stretch-rtpreempt-amd64 is complete: Failure [4failed shell_3] Build details are at http://buildbot.linuxcnc.org/buildbot/builders/4031.deb-stretch-rtpreempt-amd64/builds/574 blamelist: Dewey Garrett <dgarrett@panix.com>
04:01 AM rmu: is something like this possible / does it make sense with mesa hw: use the dpll to synchronise an internal clock to the servo period, and trigger sampling of the encoders / smart serial write/read, latching of n new velocities etc... from this clock?
06:59 AM rene_dev_: thats what the dpll does
07:10 AM rmu: rene_dev_: you can also use it to latch velocity or other values and trigger sserial?
07:11 AM rmu: seems i have to build a 7i90 spi config with dpll enabled ;)
07:55 AM rene_dev_: I dont think so. but at least for the stmbl you dont need that
08:15 AM rmu: I think current code (stepgen) assumes that new velocities are applied "immediately", not at the end of the servo period.
08:37 AM rene_dev_: yes
09:49 AM pcw_home: you can correct for some of the delay between read/write with FF2
09:52 AM pcw_home: but for normal systems with moderate acceleration the errors as so small anyway that its probably not worth bothering with