On Sunday 06 April 2014 19:08:09 Peter C. Wallace did opine: > Andy Pugh has added support for the table mode in the Mesa hardware > stepgen to linuxcnc master. This allows user programmable output pin > sequences up to 8 pins wide and 16 states deep. Firmware support for > this feature has been available for many years but the driver did not > support table mode until now. > > As a side effect of this driver change, in any bitfile that has table > mode stepgen pins, the driver will enable these pins as outputs if the > corresponding stepgen is enabled. If these pins were used for GPIO > outputs, they will become unavailable. > > If these pins were used as GPIO inputs, the pins will still be available > in HAL (to readback the outputs) but will now not work as intended for > external sense inputs. This can cause a dangerous situation if these > pins are use as limit switches or other safety related inputs. > > The following bitfiles have per stepgen table mode pins in addition to > the normal step/dir pins: > > PIN_MAUROPON.vhd > PIN_RSST12_8_96.vhd > PIN_ST12_72.vhd > PIN_SVST2_8_72.vhd > PIN_SVST4_4_48.vhd > PIN_SVST4_4NA_48.vhd > PIN_SVST4_6_48.vhd > PIN_SVST4_6NA_48.vhd > PIN_SVST4_8_72.vhd > PIN_SVST4_8_ADO_72.vhd > PIN_SVST4_8_i90_72.vhd > PIN_SVST8_3P_72.vhd > PIN_SVST8_4_72.vhd > PIN_SVST8_4P_72.vhd > PIN_SVST8_8_96.vhd > > If > > 1. You are using any of the above bitfiles > 2. You are using the hardware stepgen > 3. You are using linuxcnc master > > There may be a conflict, and I suggest not using master until the > bitfiles are updated. I plan to update all these bitfiles by removing > the table mode pins sometime next week. > > > Thanks to M. Haberler for bringing this to my attention > > > Peter Wallace > Mesa Electronics
Now I am truly puzzled Peter. Since we have very capable step/dir drivers available at quite reasonable prices, I think there needs to be a justification paper for these modes which would appear be most profligate in the use of I/O pins, written. Or has there been one, and I missed it? Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
