Remora - ethernet NVEM / EC300 / EC500 cnc board

zmrdko wrote:

Is anybody else experiencing slow approach to exact position as well on ec500? (rt1052)

Yes, this is solved by adding a Pgain setting. The default gain is 1, increasing it to 10 or more will improve the response of the control loop.

meister wrote:

i get the compilation work on my system

if i reduce the freq of this threads, the jitter is much much better !

#define PRU_BASEFREQ 20000 // PRU Base thread ISR update frequency (hz)
#define PRU_SERVOFREQ 500 // PRU Servo thread ISR update freqency (hz)

Did you also change the servo frequency in LinuxCNC and inform the Remora component about the different base thread frequency? If not the frequency command calculations are all out and the control loop will be working harder to compensate for the wacky following error. Changing these settings in the firmware must be mirrored on the LinuxCNC side.

Just a quick update.

Here is the list of pins i have checked on an RT-1053 based NVEM box.

Scott, could you tell me where (if anywhere) to other output pins go to.

Thanks
Alex

frayja2002 wrote:

Just a quick update.

Here is the list of pins i have checked on an RT-1053 based NVEM box.

Scott, could you tell me where (if anywhere) to other output pins go to.

Thanks
Alex

Hi Alex, that's it for the NVEM / EC300. The extra outputs are available on the EC500.

Thanks! I set Pgain to 10, 100 and even 200. It helped, but I am still getting 0.02 mm error now and then. Like 10 jogs are accurate and 1 jog is 0.02 off.

I think,
there is absolutely no reason to run the normal IO's in an interrupt,
but there are many reasons to reduce the code inside interrupt's.

My Changes:
github.com/multigcs/Remora-RT1052/tree/l...jitter_test/firmware

i removed also the __disable_irq part and add some kind of double buffer