I can't stress strongly enough on how impressed I am with what you've done. John
> -----Original Message----- > From: Frederic RIBLE [mailto:fri...@teaser.fr] > Sent: October-08-17 10:20 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] MachineKit on the BeagleBone Black > > On 2017-10-08 02:33, Chris Albertson wrote: > > > I don't know why people like to use these 1GHz ARM boards for machine > > controllers. > > > I can answer, I am using both BBB and PC! > My own motivation is primary experimenting: > - 2017: EMCO-120P lathe + BBB + MK + Modified Gmoccapy GUI > - 2015: C3000 machining center + BBB + MK + Qt based tablet remote GUI > - 2013: CNC-6040 router + PC + LCNC + Modified Gmoccapy GUI > - Late 90s : Wolfcraft table based mill + PC + EMC/LCNC + Axis GUI > > See http://blog.f1oat.org/2017/10/09/cnc-projects-history/ and > https://youtu.be/zVUMC1mdQKg > > Machinekit is running both on PC or BBB. > It is coming with several improvements and disrupting implementations > (see https://youtu.be/OVVGdQnz5Ts) > As an example, the new middleware is enabling a network of HAL > components running on different boards. > One application is remote GUI running on a tablet (not a remote X > session, but a true local GUI exchanging data with the remote RT > controller over LAN or Wifi). > > About the ARM based boards like the BBB, what is nice is the PRU/eQEP > subsystem: it enables high speed stepping and quadrature encoding > without the need for external FPGA board. So, for a fraction of the cost > of a PC/FPGA combination, you have high-end I/O performances. > And the DE0-Nano and DE10-Nano SOC boards are bringing additional FPGA > capabilities in a very cheap and compact form factor, useful for more > advanced I/O needs. > > If you do not really want to spent time for experimentation, PC/LCNC is > probably the way to go. > MK/BBB will be good for tight budget, high speed I/O and small size > constraints, if you are more geek. > > That will be nice if we can merge LCNC with MK in the near future. > Considering the small amount of time hobby developers have to > contribute, that's a shame to make some developments 2 times! > > I am contributing to both. Finalizing now an enhanced mb2hal component > able to replace all these dedicated VFD drivers, thanks to new powerful > configuration capabilities. Currently tested on MK, to be back-ported on > LCNC later on. > > # Syntax is HAL_MAP_PIN = name, addr, format, scale, offset > # name: name of the pin > # addr: Modbus address associated to this pin (0x format can be used > for hexa) > # format: > # bit: bit pin, mapped to one 1 bit modbus register (coil, > discrete input) > # f16: float pin, mapped to one 16 bit modbus register > # s16: s32 pin, mapped to one 16 bit modbus register > # u16: u32 pin, mapped to one 16 bit modbus register > # f32: float pin, mapped to two 16 bit modbus register (MSB first) > # s32: s32 pin, mapped to two 16 bit modbus register (MSB first) > # u32: u32 pin, mapped to two 16 bit modbus register (MSB first) > # > # scale: optional floating point scale value > # offset: optional floating point offset value > # The scale/offset formula used is: > # pin = modbus_register * scale + offset when reading from Modbus > # modbus_register = pin * scale + offset when writing to Modbus > > # Hitachi NE-S1 VFD > > [TRANSACTION_06] > MB_SLAVE_ID=2 > MB_TX_CODE=fnct_03_read_holding_registers > HAL_TX_NAME=vfd1 > # 0.01 * 2840/50.0/1.186 = 0.4789 > HAL_MAP_PIN=rpm-feedback, 0x1000, f32, 0.4789 > # 0.01 * 2840/50.0/1.186 / 60 = 7.9820e-6 > HAL_MAP_PIN=rps-feedback, 0x1000, f32, 7.9820e-6 > HAL_MAP_PIN=current-feedback, 0x1002, f16, 0.01 > HAL_MAP_PIN=direction-feedback, 0x1003, s16 > > Frederic > http://cnc.f1oat.org > > > > > ---------------------------------------------------------------------------- -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
