Advanced Search

PCW wrote:

It may be that firmware that better matches your application can be made
(MPGs are better with MPG encoders rather than motion encoders because
MPG encoders support 1X mode which works better with MPGs having detents)

 

Interesting, I have some MPG style encoders on order, I suppose I can look into this when they arrive.

After looking at the TVS's I put on my little daughter board I came to the conclusion that they were not going to help (not Schottky and Vmin specified as -0.3V) so I replaced with actual digital isolators. Presently the first two P1 encoders are routed to my scale encoders and the next two for MPG's.  So before I hit the send key can I assume that if a version with MPG friendly logic is available it will map the MPG encoders to P1 pins 7-13 or would they move to pins beyond the as is 4 encoders (P1:1-15), it would be easy for me to move my MPG inputs down to say IO:46-49 so they don't interfere with the original 4 encoder inputs if that make sense?
 

 

>Whether it is your present depends on a lot of factors. Usually money

OK. In my case, Pulse/Dir has been working reasonably well for my needs so far, and most importantly I was able to get it working with very limited (aka known) knowledge to start with.

However, since I chose the most simple/cheapest way using parport and basic Bob, I have no room to implement things that would be really useful, such as 4th axis, tool gauge, feedback to LinuxCNC, etc... Any solution that would remove these limitations would require money, so I might as well go for some sort of industry standard, or at least a solution that is not strictly dependent on a single vendor.

This discussion conforts me in the idea that EtherCAT seems a logical choice in this respect, so thank you all for sharing your knowledge and experience

rodw wrote:

Sorry, I have not had a chance to look at this over the weekend.
 

Yeah I figured that cos building an image with the 6.12.y branch fails when creating the final image. 6.1.y with the 6.1.69 kernel commit seems to build ok, image is created with Linuxcnc binaries and when patch has spi on at first boot. This was just seen by mounting the image and having a quick browse through the filesystem. Too effing late to test.

Another thing of interest there are still patches.
Directory listing of the patches that are for 6.12.8 none for 6.12.9 as you can see (6.12.8) has patches for sysfs entry and one to for enable arm rt.

So this looks like a very confusing kettle of fish.

-rw-rw-r-- 1 rmurphy rmurphy 1495 Jan 9 22:27 0001-arm-Disable-jump-label-on-PREEMPT_RT.patch
-rw-rw-r-- 1 rmurphy rmurphy 2447 Jan 9 22:27 0001-ARM-vfp-Provide-vfp_state_hold-for-VFP-locking.patch
-rw-rw-r-- 1 rmurphy rmurphy 3888 Jan 9 22:27 0001-drm-i915-Use-preempt_disable-enable_rt-where-recomme.patch
-rw-rw-r-- 1 rmurphy rmurphy 1382 Jan 9 22:27 0001-hrtimer-Use-__raise_softirq_irqoff-to-raise-the-soft.patch
-rw-rw-r-- 1 rmurphy rmurphy 3902 Jan 9 22:27 0001-powerpc-Add-preempt-lazy-support.patch
-rw-rw-r-- 1 rmurphy rmurphy 6700 Jan 9 22:27 0001-sched-Add-TIF_NEED_RESCHED_LAZY-infrastructure.patch
-rw-rw-r-- 1 rmurphy rmurphy 1384 Jan 9 22:27 0002-ARM-vfp-Use-vfp_state_hold-in-vfp_sync_hwstate.patch
-rw-rw-r-- 1 rmurphy rmurphy 3671 Jan 9 22:27 0002-drm-i915-Don-t-disable-interrupts-on-PREEMPT_RT-duri.patch
-rw-rw-r-- 1 rmurphy rmurphy 1511 Jan 9 22:27 0002-locking-rt-Remove-one-__cond_lock-in-RT-s-spin_trylo.patch
-rw-rw-r-- 1 rmurphy rmurphy 1286 Jan 9 22:27 0002-powerpc-Large-user-copy-aware-of-full-rt-lazy-preemp.patch
-rw-rw-r-- 1 rmurphy rmurphy 11004 Jan 9 22:27 0002-sched-Add-Lazy-preemption-model.patch
-rw-rw-r-- 1 rmurphy rmurphy 970 Jan 9 22:27 0002-timers-Use-__raise_softirq_irqoff-to-raise-the-softi.patch
-rw-rw-r-- 1 rmurphy rmurphy 3282 Jan 9 22:27 0002-tracing-Record-task-flag-NEED_RESCHED_LAZY.patch
-rw-rw-r-- 1 rmurphy rmurphy 1404 Jan 9 22:27 0003-ARM-vfp-Use-vfp_state_hold-in-vfp_support_entry.patch
-rw-rw-r-- 1 rmurphy rmurphy 1741 Jan 9 22:27 0003-drm-i915-Don-t-check-for-atomic-context-on-PREEMPT_R.patch
-rw-rw-r-- 1 rmurphy rmurphy 2853 Jan 9 22:27 0003-locking-rt-Add-sparse-annotation-for-RCU.patch
-rw-rw-r-- 1 rmurphy rmurphy 2660 Jan 9 22:27 0003-riscv-add-PREEMPT_LAZY-support.patch
-rw-rw-r-- 1 rmurphy rmurphy 3721 Jan 9 22:27 0003-sched-Enable-PREEMPT_DYNAMIC-for-PREEMPT_RT.patch
-rw-rw-r-- 1 rmurphy rmurphy 7638 Jan 9 22:27 0003-softirq-Use-a-dedicated-thread-for-timer-wakeups-on-.patch
-rw-rw-r-- 1 rmurphy rmurphy 3696 Jan 9 22:27 0004-ARM-vfp-Move-sending-signals-outside-of-vfp_state_ho.patch
-rw-rw-r-- 1 rmurphy rmurphy 2170 Jan 9 22:27 0004-drm-i915-Disable-tracing-points-on-PREEMPT_RT.patch
-rw-rw-r-- 1 rmurphy rmurphy 1319 Jan 9 22:27 0004-locking-rt-Annotate-unlock-followed-by-lock-for-spar.patch
-rw-rw-r-- 1 rmurphy rmurphy 2089 Jan 9 22:27 0004-sched-x86-Enable-Lazy-preemption.patch
-rw-rw-r-- 1 rmurphy rmurphy 3199 Jan 9 22:27 0005-drm-i915-gt-Use-spin_lock_irq-instead-of-local_irq_d.patch
-rw-rw-r-- 1 rmurphy rmurphy 8921 Jan 9 22:27 0005-sched-Add-laziest-preempt-model.patch
-rw-rw-r-- 1 rmurphy rmurphy 1305 Jan 9 22:27 0006-drm-i915-Drop-the-irqs_disabled-check.patch
-rw-rw-r-- 1 rmurphy rmurphy 1151 Jan 9 22:27 0007-drm-i915-guc-Consider-also-RCU-depth-in-busy-loop.patch
-rw-rw-r-- 1 rmurphy rmurphy 762 Jan 9 22:27 0008-Revert-drm-i915-Depend-on-PREEMPT_RT.patch
-rw-rw-r-- 1 rmurphy rmurphy 10272 Jan 9 22:27 0053-serial-8250-Switch-to-nbcon-console.patch
-rw-rw-r-- 1 rmurphy rmurphy 942 Jan 9 22:27 0054-serial-8250-Revert-drop-lockdep-annotation-from-seri.patch
-rw-rw-r-- 1 rmurphy rmurphy 379 Jan 9 22:27 Add_localversion_for_-RT_release.patch
-rw-rw-r-- 1 rmurphy rmurphy 1013 Jan 9 22:27 ARM__Allow_to_enable_RT.patch
-rw-rw-r-- 1 rmurphy rmurphy 1370 Jan 9 22:27 arm-Disable-FAST_GUP-on-PREEMPT_RT-if-HIGHPTE-is-als.patch
-rw-rw-r-- 1 rmurphy rmurphy 3310 Jan 9 22:27 ARM__enable_irq_in_translation_section_permission_fault_handlers.patch
-rw-rw-r-- 1 rmurphy rmurphy 7625 Jan 9 22:27 netfilter-nft_counter-Use-u64_stats_t-for-statistic.patch
-rw-rw-r-- 1 rmurphy rmurphy 1061 Jan 9 22:27 POWERPC__Allow_to_enable_RT.patch
-rw-rw-r-- 1 rmurphy rmurphy 1837 Jan 9 22:27 powerpc_kvm__Disable_in-kernel_MPIC_emulation_for_PREEMPT_RT.patch
-rw-rw-r-- 1 rmurphy rmurphy 3446 Jan 9 22:27 powerpc_pseries_iommu__Use_a_locallock_instead_local_irq_save.patch
-rw-rw-r-- 1 rmurphy rmurphy 903 Jan 9 22:27 powerpc-pseries-Select-the-generic-memory-allocator.patch
-rw-rw-r-- 1 rmurphy rmurphy 1120 Jan 9 22:27 powerpc_stackprotector__work_around_stack-guard_init_from_atomic.patch
-rw-rw-r-- 1 rmurphy rmurphy 1249 Jan 9 22:27 powerpc__traps__Use_PREEMPT_RT.patch
-rw-rw-r-- 1 rmurphy rmurphy 1762 Jan 9 22:27 riscv-add-PREEMPT_AUTO-support.patch
-rw-rw-r-- 1 rmurphy rmurphy 930 Jan 9 22:27 sched-Fixup-the-IS_ENABLED-check-for-PREEMPT_LAZY.patch
-rw-rw-r-- 1 rmurphy rmurphy 4049 Jan 9 22:27 series
-rw-rw-r-- 1 rmurphy rmurphy 1401 Jan 9 22:27 sysfs__Add__sys_kernel_realtime_entry.patch
-rw-rw-r-- 1 rmurphy rmurphy 2965 Jan 9 22:27 tracing-Remove-TRACE_FLAG_IRQS_NOSUPPORT.patch