Ok thanks. Once I get things working and know the register layout of the finished module I will get some advice as to a final proper address location.
On Mon, Mar 30, 2020 at 5:01 PM Peter C. Wallace <p...@mesanet.com> wrote: > On Mon, 30 Mar 2020, Curtis Dutton wrote: > > > Date: Mon, 30 Mar 2020 16:33:13 -0400 > > From: Curtis Dutton <curtd...@gmail.com> > > Reply-To: EMC developers <emc-developers@lists.sourceforge.net> > > To: EMC developers <emc-developers@lists.sourceforge.net> > > Subject: [Emc-developers] Mesa Sigma5ABS module > > > > Hi all, > > > > I'm working out the design for the Yaskawa Sigma V absolute encoders. > > > > Within hostmot2-firmware, > > > > I've been studying the code and I'm not sure of the exact interface > between > > the mesa pci cards and linuxcnc. > > > > It seems that the pci card is mapping registers into memory and that each > > module is reserving a register address so that the hostmot2 driver knows > > where to look for them to control them. > > > > > > In IDROMConst.vhd, I'm looking for register address space to use. But I'm > > getting the feeling that it is all used up. Perhaps that is the reason > that > > pkuart chose to use the same address's as the uart module. > > > > The DPLLFreqLowAddr comments "note overlaps translate RAM" and "will fix > in > > the greate re-alignment".... > > > > Does anyone know what the great re-alignment will be? > > > > Can anyone shed some light on the addressing scheme used with the mesa > > cards. Any other overview of how it works would be useful too. > > At one time there was only 32K of useable address space because the EPP > interfaced cards used the MSB of the address as an address autoinc flag. > Since > EPP interfaced cards are basically legacy devices at this point, newer hm2 > modules use addresses > 0x7FFF and currently B000,C000,D000,E000,F000 are > all > free. > > At some point, complile time allocation of module addresses might make > sense, > but that's a fairly large change so I think I'll wait until I run out of > address > space until I do that. > > Note, there's no harm in overlap as long as you dont expect to use the > overlapping modules in the same configuration > > > > > > > > Thanks, > > Curt > > > > _______________________________________________ > > Emc-developers mailing list > > Emc-developers@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-developers > > > > Peter Wallace > Mesa Electronics > > > > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers > _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
