Dragon does AT90USBKey thru JTAG

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

The latest update of Studio now allows the Dragon to work as a programming tool (not debug)through the JTAG interface on the Key's JTAG port . The (hack)cable in the picture is for ISP programming of the Key.

Attachment(s): 

Last Edited: Sun. Mar 4, 2007 - 08:50 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I want a mega88 with USB :(

Just broke down and got my client to get me a MKII. Finding that porting Mega88 code to the AT90USB127 is a chore as I now have way too many resources to deal with.

The real question is finding a decent way to deal with those odd size headers. I found a HSC (A local surplus/overstock store) some headers, But I have nothing to mate with them. Anyone know the mouser or digikey part number for some sort of transition cable that has decent .1 pitch on one end and these weird spacing on the other?

Also how to disable the extras, like the button thingy and the flash memory. I really do not need a lot of IO, I do however need USB.

-julie

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

Julie,

Couldn't you stick with Mega88 and just add an FDTI?

Cliff

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

digitool wrote:
The (hack)cable in the picture is for ISP programming of the Key.

Very nice. I've been looking for the sub 0.1" headers
for the AT90USB. Do you part number for those female headers? Thanks!

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

Kevin
The female connectors are from Digi-Key .AMPMODU system 50 is the series. They are a little 'pricey' .I used the 24 pin which allowed me to get 2 ports .The 2 middle set of pins are removed .They can be also cut in half . There is a header that mates with it .

The p/ns are A28758-ND and A24832-ND . I just noticed that there are similar parts that are new in the latest catalog that are a little cheaper.

Pete

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

Thanks, Pete!

The information is much appreciated.

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

clawson wrote:
Julie,

Couldn't you stick with Mega88 and just add an FDTI?

Cliff

It is a driver issue. According to FTDI they do not expose any HID endpoints other than a com port.

I have a nice setup working with FTDI but there is no way to make it work decently with existing operating systems. Possibly I could hack a win9x driver, but the client does not want old stuff. With apple I can provide an interface layer, but most users will probably be running XP. I just do not have the three to 18 months it would take to write the drivers. All because I can not change device descriptors in the FTDI chip.

-julie