Can't get ISP adaptor to work

Go To Last Post
8 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I have just built the 'original ISP LPT adapter', but can't get it to work.
avrsp says that there is "NO ISP adapter on LPT1"
How come AVR Studio does NOT have support for LPT adapters? I couldn't find an option to connect to the AVR/ISP through the LPT port!

I used the circuit on the elm-chang.org, more exactly this one, The buffered version.

The weird part is that I have double-triple-quadruple-checked the circuit, no shorts, but even if i disconnect it from the computer (no input on pins 1,4,10,13), there is a 1.3V on these pins, and a logical high on all outputs. (If i remove the IC from the board, the mysterious 1.3V disappear, so no shorts there).

I used an SN74LS126AN instead of the 74HC126 (they are said to be identical) and an A1013 instead of the A1048, one of my friends (he's an electrician), said it was O.K.

If you can help me with anything, I'd be very very very grateful!

Attachment(s): 

axos88

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Quote:
How come AVR Studio does NOT have support for LPT adapters?
Because they are such a pain to get working correctly on modern PCs and under newer O/S. If you do a small search on this forum you will see that the majority of problem happen with this kind of programmers. When I started playing with AVRs I also made one of those parallel port programmers, then I used an AVR910 type serial port programmer but when I got serious about using the AVRs for work I purchased an AVRIsp, not that expensive but highly reliable...well until we get a firmware update...then things go wrong for a while :)

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

If you really want to use a parallel port programmer, you should try using PonyProg with it. Slow as hell, but since you already have the hardware.

Also LS and HC type chips are very different by electrical specs, even if they are identical by function. Yes they should work, but you really should read a beginners electronic book about their differences.

I hope your electrician friend is good with electronics too. I couldn't find a decent datasheet for the other transistor, but as long you know if there are differences in pinouts. Both are PNP.

- Jani

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I have built an ISP-cable from the description on Peter Fleurys site.
http://jump.to/fleury

I never had any problems with this.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Thanks guys. I already downloaded and tried with ponyprog too, doesn't recognize it either :( Now i'm trying to do the other one, the one without the IC, should be ready in a couple of minutes

axos88

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Nope :( this one won't work either

axos88

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Do you have your LPT port set up as a simple port mode (from BIOS)? Do you have giveio.sys or similar installed? How fast is your PC? What OS are you running?

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I haven't looked how it is set up, I have Windows XP, with giveio.sys installed. Intel 2,4 Ghz

I use an ATMEGA8515-16, with a 4Mhz Chrystal

Sorry for not providing these

axos88