Several USB--GPIB designs may be found on the web, for example, https://github.com/fenrir-naru/gpib-usbcdc/
I chose this one because it uses the bus driver chips, rather than driving the bus directly with the microporcessor. It uses a http://www.silabs.com/products/mcu/8-bit/c8051f38x/Pages/c8051f38x.aspx microprocessor, and SN74ALS160, and SN74ALS162 bus driver chips. It includes source code and a (quite small) PC design, in Eagle. I've built this, with PC design modified to use a 32LQFP package. It works, at least for the simple use cases I've tried. David On 2020-11-08 15:51, Ben Bradley wrote: > On Fri, Oct 23, 2020 at 9:14 AM jimlux <jim...@earthlink.net> wrote: > >> ... >> to be set - for instance, Arduinos work that way: >> >> digitalWrite(pin#, HIGH) >> >> I think GPIB would still work if you had to do 8 digitalWrite() calls, >> then a final digitalWrite() call to assert DAV. >> >> I suspect that for a number of Arduino type processors, there is a way >> to write or read all 8 at once, assuming you were clever enough to pick >> the right pins to use. > > It's easy once you figure out which I/O ports you're using. I traced > the AVR pinout and Arduino Mega 2560 schematic to translate between > AVR ports and Arduino I/O pin numbers and to find the port I wanted to > use. Googling found the port names that you can directly read from and > write to in Arduino C/C++ code, as opposed to using the digitalwrite > function for each bit. Here I used DDRC and PORTC: > http://blog.freesideatlanta.org/2017/02/a-capacitive-touch-janko-keyboard-what.html > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.