I’m new here and have question about PWM Up/down mode. From EMC docs and wiki,
Pluto-P can be configured for both step/dir or up/down output mode. Can either
MESA 5i20 or 7i43 output PWM up/down? Or could firmware be modified with Xilinx
ISE for up/down? Searching thru CVS 2.3-pre source, I found:
/src/hal/drivers/mesa7i43-firmware/hostmot2/hostmot2-register-map
Bit 4,3 = PWM output mode select
00 = Normal Sign Magnitude PWM&DIR outputs normal
01 = Normal Sign Magnitude PWM&DIR outputs swapped (for locked antiphase)
10 = Up/down mode
11 = PDM mode (12 bits)
Not sure if “10 = Up/down mode” really refers to output (or encoder)? I’d like
to build a 130vdc 500 watt h-bridge for spindle and don’t think step/dir will
work.
I started working with EMC last month using Debian Sid, RTAI 3.6 and Fluxbox
desktop. I stripped the kernel to bare minimum and used
http://www.rtai.dk/cgi-bin/gratiswiki.pl?Latency_Killer to tweak an old Asus
P2B motherboard. EMC2 installed fairly smooth, except for dealing with Matrox
G400 DRI DMA calls/AXIS window moves causing latency spikes. I built a home
alarm system three years ago with RTAI and Velleman K8000 IO board, the
experience helped with EMC.
The machines I’m working with are Sieg X2 mill with table mounted Micromark
headstock for 4-axis and a Cummins mini-lathe for turning parts for the
mill/lathe combo.
Keil
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