I will write a vhdl module then. While reading your previous explanation I only noticed rs485 and figured the rest would be decoding bits in software. My mistake. Pointers to relevant background would have been useful. I will look into that myself.
Thanks for already figuring this all out. It will be extremely helpful, and I hope that enabling a path to using yaskawa servos with linuxcnc will help the cause. -Curt On Thu, Mar 26, 2020 at 7:30 AM Rene Hopf via Emc-developers < emc-developers@lists.sourceforge.net> wrote: > > > > On 25. Mar 2020, at 22:10, Peter C. Wallace <p...@mesanet.com> wrote: > > > > On Wed, 25 Mar 2020, Curtis Dutton wrote: > > > >> Date: Wed, 25 Mar 2020 14:02:39 -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: Re: [Emc-developers] pktuart -> rs-485 > >> Apologies. It is a 7i74 not a 7i84. > > > > BTW a simple way to bisect the testing process is to simply loop back > the FPGA TX line to the FPGA RX line, to eliminate any issues with TXEN, > polarities, RS-485 driver hookup etc etc > > I explained it already, yaskawa is not a uart, its hdlc over Manchester > over rs485. > It cannot work with the pkguart or ssi driver. > To get it to work with a mesa card requires a new vhdl module. It requires > clock recovery, so you can’t even just pick bits at times. > This is my implementation in the Stmbl: > https://github.com/rene-dev/stmbl/blob/master/src/comps/yaskawa.c#L85 < > https://github.com/rene-dev/stmbl/blob/master/src/comps/yaskawa.c#L85> > Its decoded with clock recovery by using a timer chained to a dma channel, > which ends up with a run length encoding in memory. > The request is also generated with the dma. > I can make a pcb that converts all the fb systems the Stmbl supports to > sserial. > > > > > > > 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 > _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
