On Monday 15 November 2021 11:44:56 dave engvall wrote: > Is anyone using ethernet as a link between linuxcnc and a 7i90? > Comments and/help appreciated > > Dave > Never heard of it Dave, but for an rpi, the spi interface is the fastest by quite a bit. Both the rpi3 and the rpi4 can talk to a 7i90, writing to it at:
pi@rpi4:/media/pi/workspace $ linuxcnc -l LINUXCNC - 2.9.0-pre0-5020-g9f0ad4c8e Machine configuration directory is '/home/pi/linuxcnc/configs/sheldon-lathe' Machine configuration file is '7i90-axis.ini' Starting LinuxCNC... Found file(REL): ./hm2-7i90-stepper.hal Note: Using POSIX realtime hm2: loading Mesa HostMot2 driver version 0.15 hm2_rpspi: Platform: Raspberry Pi 4 Model B Rev 1.1 hm2_rpspi: Base address 0xfe000000 size 0x01800000 hm2_rpspi: Mapped peripherals from 0xfe000000 (size 0x01800000) to gpio:0x0xb4200000, spi:0x0xb4204000, aux:0x0xb4215000 hm2_rpspi: SPI0/CE0 clock rate: 41666000/25000000 Hz, VPU clock rate: 500000000 Hz hm2_rpspi: SPI0/CE0 write clock rate calculated: 41666666 Hz (clkdiv=12) # to the 7i90 hm2_rpspi: SPI0/CE0 read clock rate calculated: 25000000 Hz (clkdiv=20) # from the 7i90 hm2_rpspi: SPI0/CE0 Valid cookie matched hm2_rpspi: SPI0/CE0 Base: hm2_7i90.0 And does it as 4, 8 bit packets at a time. Interesting to watch, on a 4 trace 350 mhz scope, Siglents best. Take care and stay well Dave. Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis 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
