Parallelport-Treiber

The hal_parport driver is a real time component so it must be loaded into the real time thread with loadrt. The configuration string describes the parallel ports to be used, and (optionally) their types. If the configuration string does not describe at least one port, it is an error.

Numbers below 16 refer to parallel ports detected by the system. This is the simplest way to configure the hal_parport driver and cooperates with the Linux parport_pc driver if it is loaded. A port of 0 is the first parallel port detected on the system, 1 is the next and so on.

Dies wird den ersten parallelen Port verwenden, den Linux erkennt:

Stattdessen kann die Anschlussadresse in Hexadezimalschreibweise mit dem Präfix "0x" angegeben werden.

The config string represents the hexadecimal address of the port, optionally followed by a direction, all repeated for each port. The directions are in, out, or x, and determine the direction of the physical pins 2 to 9 of the D-Sub 25 connector. If the direction is not specified, the data group will by default be configured as outputs. For example:

This example installs the drivers for a port 0x0278, with pins 2 to 9 as outputs (by default, since neither in nor out is specified), a port 0x0378, with pins 2 to 9 as inputs and a 0x20A0 port, with pins 2 to 9 explicitly specified as outputs. Note that you must know the base address of the parallel ports to configure the drivers correctly. For ISA bus ports, this is usually not a problem, since the ports are almost always at a well-known address, such as 0x278 or 0x378 which are typically configured in the BIOS. The addresses of PCI bus cards are usually found with lspci -v in an I/O ports line, or in a kernel message after running sudo modprobe -a parport_pc. There is no default address, so if <config-string> does not contain at least one address, it is an error.

Für jede parallele Schnittstelle, die vom hal_parport Treiber verwaltet wird, kann optional ein Typ angegeben werden. Der Typ ist einer von in, out, epp oder x.

Wenn der Typ nicht angegeben wird, ist der Standardwert "out".

Ein Typ epp ist derselbe wie out, aber der hal_parport Treiber fordert den Port auf, in den EPP-Modus zu wechseln. Der hal_parport-Treiber benutzt nicht das EPP-Busprotokoll, aber auf einigen Systemen ändert der EPP-Modus die elektrischen Eigenschaften des Ports auf eine Weise, die einige marginale Hardware besser funktionieren lässt. Es ist bekannt, dass die Ladungspumpe des Gecko G540 dies bei einigen parallelen Anschlüssen erfordert.

Siehe den obigen Hinweis zum Modus x.

Dadurch werden zwei vom System erkannte parallele Schnittstellen aktiviert, die erste im Ausgabemodus und die zweite im Eingabemodus:

Sie müssen LinuxCNC auch anweisen, die Funktionen Lesen und Schreiben auszuführen.

One good PCI parport card is made with the Netmos 9815 chipset. It has good +5 V signals, and can come in a single or dual ports.

Um die E/A-Adressen für PCI-Karten zu finden, öffnen Sie ein Terminalfenster und verwenden Sie den Befehl list pci:

Suchen Sie nach dem Eintrag mit "Netmos". Beispiel einer 2-Port-Karte:

From experimentation, I’ve found the first port (the on-card port) uses the third address listed (c000), and the second port (the one that attaches with a ribbon cable) uses the first address listed (b800). The following example shows the onboard parallel port and a PCI parallel port using the default out direction.

Please note that your values will differ. The Netmos cards are Plug-N-Play, and might change their settings depending on which slot you put them into, so if you like to get under the hood and re-arrange things, be sure to check these values before you start LinuxCNC.

For each pin, <p> is the port number, and <n> is the physical pin number in the 25 pin D-shell connector.

For each physical output pin, the driver creates a single HAL pin, for example: parport.0.pin-14-out.

For each physical input pin, the driver creates two HAL pins, for example: parport.0.pin-12-in and parport.0.pin-12-in-not.

The -in HAL pin is TRUE if the physical pin is high, and FALSE if the physical pin is low. The -in-not HAL pin is inverted and is FALSE if the physical pin is high.

The -invert parameter determines whether an output pin is active high or active low. If -invert is FALSE, setting the HAL -out pin TRUE drives the physical pin high, and FALSE drives it low. If -invert is TRUE, then setting the HAL -out pin TRUE will drive the physical pin low.

The individual functions are provided for situations where one port needs to be updated in a very fast thread, but other ports can be updated in a slower thread to save CPU time. It is probably not a good idea to use both an -all function and an individual function at the same time.

Wenn das Laden des Moduls berichtet

dann stellen Sie sicher, dass das Standard-Kernelmodul parport_pc nicht geladen ist Fußnote:[In den LinuxCNC-Paketen für Ubuntu verhindert die Datei /etc/modprobe.d/emc2 im Allgemeinen, dass parport_pc automatisch geladen wird.] und dass kein anderes Gerät im System die I/O-Ports beansprucht hat.

Wenn das Modul geladen wird, aber nicht zu funktionieren scheint, ist die Anschlussadresse falsch.

To setup DoubleStep on the parallel port you must add the function parport.n.reset after parport.n.write and configure stepspace to 0 and the reset time wanted. So that step can be asserted on every period in HAL and then toggled off by parport after being asserted for time specified by parport.`__n__.reset-time`.

Zum Beispiel:

More information on DoubleStep can be found on the wiki.

In today’s PCs, parallel ports may require a plug and play (PNP) configuration before they can be used. The kernel module probe_parport configures all PNP ports present. It must be loaded before hal_parport. On machines without a PNP port, it can be loaded but will have no effect.