usb to parallel port dip chip - Page 1
Forum section: electronics / projects

author: peterthenovice
author_rank: Regular Contributor
timestamp: March 13, 2013, 03:08:06 pm
content: I am looking for a chip that can be used to convert usb to a paralell port. i am trying to make my own avr isp.

author: mrflibble
author_rank: Super Contributor
timestamp: March 13, 2013, 03:19:08 pm
content: just rip the other half out put in a bread board

author: peterthenovice
author_rank: Regular Contributor
timestamp: March 13, 2013, 03:23:23 pm
content: great Idea! :-

author: ecat
author_rank: Frequent Contributor
timestamp: March 13, 2013, 04:14:16 pm
content: Chip? No.You could try a PCI-E parallel port card (or whatever your motherboard accepts), I have one on my CNC machine and it works fine with both Win7 and Linux. Now, if you have an arduino handy, the AVR ISP sketch did the job for me, programming a 328 from a Mini Pro.

author: mariush
author_rank: Super Contributor
timestamp: March 13, 2013, 04:25:48 pm
content: why parallel in the first placeget some schematics, some source code of parallel port programmers , understand what the software is doing with the parallel port and change it so it would work through serial portYou have usb to serial adapters that are cheap (2-3 bucks) and lots of microcontrollers have hardware spi/serial so no problem getting data from pc this way.

author: mrflibble
author_rank: Super Contributor
timestamp: March 13, 2013, 05:05:06 pm
content: Quote from: peterthenovice on March 13, 2013, 03:23:23 pmYeah, I read that idea in a thread somewhere.

author: IanB
author_rank: Super Contributor
timestamp: March 13, 2013, 06:22:30 pm
content: Quote from: peterthenovice on March 13, 2013, 03:08:06 pmThis is not possible (convert USB to parallel port). There is no USB/parallel port interface that replicates the full functionality of a genuine parallel port (bidirectional, all pins available, accurate timings, etc.). The USB/parallel printer cables only provide enough support to make printers work.To get a proper parallel port you need to use an actual parallel port interface card that plugs directly into a system bus like an ISA card or a PC card.

author: Smokey
author_rank: Super Contributor
timestamp: March 13, 2013, 07:45:59 pm
content: Some FTDI chips can do a sort of USB-Parallel out of the box can't they?

author: IanB
author_rank: Super Contributor
timestamp: March 13, 2013, 08:00:31 pm
content: Quote from: Smokey on March 13, 2013, 07:45:59 pmYou can buy USB-to-parallel printer adapters based around FTDI or similar chips, but these adapters do not actually implement the full parallel port specification at the system level. They do just enough to drive a printer.This is in contrast to serial ports, where a good USB-serial adapter will provide a full virtual COM port at the system level that behaves just like a real one. This same functionality is not available for parallel ports.

author: mrflibble
author_rank: Super Contributor
timestamp: March 13, 2013, 08:03:26 pm
content: Quote from: IanB on March 13, 2013, 06:22:30 pmWell, never say never. But in the practical sense you are quite correct. The ones that come even close are $100+, which defeats the purpose. And the biggest challenge those have is timings. PC + USB ==> parallel converter .. just say bye bye to any hope of hard timings.In any event, I'll assume the OP has a functional goal, and using a parport is just what he thought of. If the goal is "make cheapo avr isp" then there are better solutions that do not involve usb/parport conversion.I am purposefully out of the AVR stuff, but aren't there cheapo chinese clones of whatever you are thinking of on ebay? Or maybe use a cheapo jtag capable goodie?

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 13, 2013, 08:59:06 pm
content: http://www.ccs.neu.edu/home/bchafy/parallel/parallel.html

author: Skimask
author_rank: Super Contributor
timestamp: March 13, 2013, 11:15:11 pm
content: Quote from: Smokey on March 13, 2013, 07:45:59 pmFT245AM / FT245BM...Got a handful about 4ft to my right...(which does nobody any good and not worth a mention, but I mentioned it anyway)

author: BravoV
author_rank: Super Contributor
timestamp: March 14, 2013, 01:22:13 am
content: http://www-user.tu-chemnitz.de/~heha/bastelecke/Rund%20um%20den%20PC/USB2LPT/ul-15.en.htm

author: peterthenovice
author_rank: Regular Contributor
timestamp: March 14, 2013, 01:29:34 am
content: I am plannig on buying a usb icsp avr programmer for about 4 us dollars on ebay.

author: pspgeek
author_rank: Contributor
timestamp: March 14, 2013, 03:20:56 am
content: I needed a avr programmer so I made the "AVRStudio compatible AVRISP-MKII Programmer Clone" in the LUFA page and also made my own LittleWire.

author: richcj10
author_rank: Unknown
timestamp: March 14, 2013, 06:01:08 am
content: Quote from: pspgeek on March 14, 2013, 03:20:56 amI made my own clone too.It works really well.

author: asbokid
author_rank: Regular Contributor
timestamp: March 14, 2013, 11:29:51 am
content: The CH341 from winchiphead (what sort of name is that?!) has a USB-parallel function. It probably doesn't work very well.The AVR ISP clones are two dollars if you shop around.cheers, a