On Mon, 2011-04-18 at 07:54 +0200, Jan de Kruyf wrote: ... snip > I unfortunately do not know the parameters neededn for lp or EMC: In fact > come to think of it, is lp used in EMC or ppdev??? ... snip
Four drivers are normally loaded; lp, ppdev and parport_pc and parport. In older versions of EMC2 one or two of these where required to be unloaded and was handled by the Linux start-up scripts. For current versions, I believe lp is needed if one wants to use a printer on the EMC2 PC. I think ppdev (or parport_pc?) is needed if one wants to use numbered ID's such as 0 for the first port, 1 for the second, etcetera. If using only direct addresses for the loadrt hal_parport, none of the other drivers are required to be loaded, or unloaded. Only the correct address for the installed hardware is needed, otherwise an ID number could be used. http://www.linuxcnc.org/docview/html/hal_parallel_port.html To find the installed hardware addresses, "lspci -v" can be used to find the addresses of PCI add-on ports. Usually the addresses shown are for the base and the extended registers. The base addresses are used with the hal_parport config string. An example can be found at the bottom of the page here: http://wiki.linuxcnc.org/emcinfo.pl?Startech The listing shows the base and extended registers for the two parallel ports on this particular PCI card. The "[ECP]" shows that ECP is supported and also implies EPP is supported. The motherboard parallel port addresses and other information may be found by removing the parport_pc, then reloading and checking dmesg, such as... " kwallace@910:~$ sudo rmmod parport_pc kwallace@910:~$ sudo modprobe parport_pc kwallace@910:~$ dmesg ... [ 2525.974319] parport_pc 00:0a: disabled [ 2544.613816] parport_pc 00:0a: activated [ 2544.613826] parport_pc 00:0a: reported by Plug and Play ACPI [ 2544.613967] parport0: PC-style at 0x378 (0x778), irq 7, dma 3 [PCSPP,TRISTATE,COMPAT,ECP,DMA] [ 2544.701868] parport0: Printer, EPSON Stylus COLOR 600 ... " On my workstation, it can be seen that I have a base register at 0x378, an extended register at 0x778 and ECP (EPP), and an EPSON printer connected. Unloading, reloading and dmesg for the other drivers may provide more information. Other links: http://wiki.linuxcnc.org/emcinfo.pl?SIIG http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?NetMos http://www.beyondlogic.org/ The port pins can not be relied upon to follow a standard, but it is safer to assume that each output will source no current and sink up to 3mA. This means that a pull up resistor is needed to provide the output current. The parallel port pin will pull the output to 0 Volts for a logic 0, and allow the pull-up to bring the pin to 5 Volts for a logic 1. A 1.5k Ohm pull-up resistor to a 5 Volt supply is common. Depending on the circuit that the output is connected to, a current limit resistor and/or reverse current diode and/or opto-isolator may be needed. A buffer chip such as a 74AC241 (244, 245 or similar) to drive any sort of a load such as an LED. The AC series chips can source or sink 24mA. http://focus.ti.com/lit/ds/symlink/sn74ac241.pdf If the parallel port runs on 3 Volts a level translator type chip may be needed. PCI parallel port cards usually run on 5 Volts and are _much_ cheaper to replace than motherboard ports. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Benefiting from Server Virtualization: Beyond Initial Workload Consolidation -- Increasing the use of server virtualization is a top priority.Virtualization can reduce costs, simplify management, and improve application availability and disaster protection. Learn more about boosting the value of server virtualization. http://p.sf.net/sfu/vmware-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
