Actually I see no reason why the Raspberrry Pi GPIO header could not be used as PC parallel port.

ed as PC parallel port.

er machinery.

o date video.

Yeah, you could bit-bang the port to make it work like a parallel port. Or serial port. Might be a good "core machine" for a linux- based CNC controller. A lot of these machines are older PCs controlling a motor drive board through the parallel port. The electronics for such is relatively straightforward. Making the linear motion stuff (mechanicals) with tight tolerances is challanging.

On a sunny day (Thu, 14 Mar 2013 10:12:52 -0700 (PDT)) it happened " snipped-for-privacy@gmail.com" wrote in :

There are RXD and TXD signals already brought out on the GPIO header (GPIO 14 = TXD and GPIO 15 = RXD), and AFAIK the Broadcom chip has an internal UART, so for serial all you need is one of those 3.3V MAX-IM chips, or use a MAX-Pantel circuit:

I did this for the Beagle Board, put in bidirectional level translators and control inputs to them. I needed to emulate EPP (IEEE-1284) port handshaking, and did it with a little bit of user-space code. it worked well.

Jon

PC parallel port.

machinery.

video.

You can do that yourself. Writing such a driver is peanuts! I wouldn't be surprised if there is already a driver which can make a parallel port out of GPIO.

used as PC parallel port.

teer machinery.

to date video.

doing a parallel port is only part of it, to do a CNC controller you also need an accurate timer to control it

though it is possible, MACH3 run on windows, with a special kernel driver I assume LinuxCNC with some realtime extension to linux I think

-Lasse

yeah, IEEE1284 is a subset of GPIO

yeah, perhaps write a parport_rpi that presents the same interface as parport_pc, and make a "plate" with a DB25F

not I, I've only touched about 12 lines of the kernel, fixing serial drivers both times.

On a sunny day (15 Mar 2013 21:54:56 GMT) it happened Jasen Betts wrote in :

I remember something about an interrupt, but do not see it here. The 3.3V out would be no problem, my PC mobo also gives only

Right you beat me to it :-)

I did some thing on the old audio driver, OSS, just added 48kHz support for some soundcard.

Writing a kernal module that you can then just insert from user-space is easy, I tried a nice tutorial I found on the net, create a device, it is all in there.