Hey Peter, thanks for your reply to my earlier post.
Well, I understand the points you made perfectly, however I'd still like to try compiling my own firmware - because changing the firmware beats fixing the custom pcbs that I ordered already :(. Besides it would be a useful ability to make changes anyway, even if it does not work this time. I have W3 down on the 7i43 now, so the pullups on the card are disabled. I have optocouplers on the output pins on my pcb and I hope that the fpga's pulldowns once enabled will be sufficent to drive them low once the fpga is initialised with gpio pins as inputs. I the tests I made in the last days, all my outputs stayed low before loading the 7i43 hal module, so I assume that I'll be alright. What is the procedure for synthesising my own firmware for the 7i43 ? I have seen the the firmware file on the mesanet website here: http://www.mesanet.com/software/parallel/7i43.zip When I extract the 7i43.zip file, is this the correct directory for the firmware for emc2: ? 7i43/CONFIGS/HOSTMOT2/EPPHM2/SOURCE If it is the correct directory, which one of the two files shall I use ? 7i43epphm2.zip hm2src.zip How do I get the ise project file ? I tried executing the tcl file, but I got a ton of errors ? $ tclsh ./hostmot2_import.tcl ERROR: A problem occured loading library libCit_CoreStub.so. couldn't load file "libCit_CoreStub.so": libCit_CoreStub.so: cannot open shared object file: No such file or directory couldn't load file "libCit_CoreStub.so": libCit_CoreStub.so: cannot open shared object file: No such file or directory ....many more error messages follow ..... Will the firmware from your website work with the current hal software driver in emc2, or do I need to use a different version ? I have ISE 12.3 installed: Do you happen to know whether that version will work ? Thanks BR Max. > On Wed, 17 Aug 2011, Maximilian H wrote: > >> Date: Wed, 17 Aug 2011 09:01:00 +0200 >> From: Maximilian H <mhemc2nos...@googlemail.com> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <emc-users@lists.sourceforge.net> >> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >> Subject: [Emc-users] Mesa 7i43 fpga internal input pull ups - could sb >> synthesise another firmware for the 7i43 with pull downs for GPIO pins >> please ? >> >> >> Hello List, >> >> I have run into a problem with my new revision of my pcb which adapts a >> 7i43 and a 7i33 to a machine of mine. >> >> Before I had W3 in the up position, which enabled the pull ups on the >> 7i43. Then I inverted the polarity of the outputs in the hal layer,i.e. >> the output signals where active low. >> >> While designing the new pcb I thought I'd get rid of the inversion of >> the polarity in the hal layer and designed the output signals to be >> active high. Turns out that this was a *bad* idea. >> >> Now I running into the same problem as Malte on the 11th of this month >> in "[Emc-users] Mesa 7i43 hostmot and EMC2 exit"i,i.e. once emc2 unloads >> the watchdogs bite, all output are reconfigured as input. The internal >> pullup drive the pin high and all my outputs on the pcb are enabled. >> >> Now I was looking for a quick fix and found lines like these in the >> 7i43.ucf. These are the pins that I use for outputs. Pin numbers are 24 >> to 31 in the hal layer. >> >> 7i43u.ucf:NET "IOBITS<27>" LOC = "p27" | IOSTANDARD = LVCMOS33 | DRIVE >> = 24 | SLEW = SLOW | PULLUP ; >> >> I am hoping that putting PULLDOWN here instead of PULLUP would solve my >> problems. >> Could somebody comment on that ? As anybody tried ? >> >> Could somebody synthesise a new firmware for me with these pins having >> internal pulldown instead of pullups. >> >> Thanks >> BR >> Max. > > > This is possible but unfortunately its not a really good solution. The reason > is that the FPGA pins will still float before the FPGA is configured. The > choice of active Low outputs was done for two reasons: > > 1. The 50 pin I/O connectors are compatible with I/O module racks, like > OPTO22 > GrayHill, WRC or others > > 2. The FPGA has a pre configuration PULL_UP option so its easy to get a > defined high state on the pins at power up. > > > You can set the pulldown option in the .ucf file and disable the pre-config > pullups on the 7I43, and it may work, but its not optimal. > >> >> >> >> >> ------------------------------------------------------------------------------ >> Get a FREE DOWNLOAD! and learn more about uberSVN rich system, >> user administration capabilities and model configuration. Take >> the hassle out of deploying and managing Subversion and the >> tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > ------------------------------------------------------------------------------ > Get a FREE DOWNLOAD! and learn more about uberSVN rich system, > user administration capabilities and model configuration. Take > the hassle out of deploying and managing Subversion and the > tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Get a FREE DOWNLOAD! and learn more about uberSVN rich system, user administration capabilities and model configuration. Take the hassle out of deploying and managing Subversion and the tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
