I'm no expert, here, but it seems there are three "modes" these things can work in.ġ: Unidirectional - Might work for your project. (There's lots of info about this all 'round the interwebs).īUT: If your project *can* work within those limitations, then you'll first need to figure out how to set the adapter into the right mode. So, don't be getting high-hopes about bit-banging this thing. These adapters are *nothing* like the ol' Parallel Port built into old motherboards or on ISA cards. so take this as the ramblings of a newb):įirst: There are Major Limitations. So, you've got a USB-to-Parallel adapter that you'd like to use for a project (not a printer). (Similar to setting the baud-rate of a serial port.) This is about checking and changing the parallel port mode. the parallel port may've been scanned by linux for attached-devices, which may leave your parallel port in an unknown mode. However, brief note as to the main point, here. Input, however, may be a little more difficult, I don't know. You could probably control a 7-segment LED with a little wiring and "echo x > /dev/usb/lp0". If you just want to write some outputs (blink LEDs, control a text-LCD, etc.) please check out the link in the comments. 2019: Apologies, this was written with #sdramThingZero - 133MS/s 32-bit Logic Analyzer in-mind, and therefore is *way* overcomplicated for most projects.
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