Comments on: Automatic JTAG Pinout Detection http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/ Fresh hacks every day Sat, 21 Nov 2009 18:46:40 +0000 http://wordpress.com/ hourly 1 By: kocoman http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28579 kocoman Mon, 15 Oct 2007 16:12:56 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28579 There are no schematics anywhere on that site?? How do you built it? There are no schematics anywhere on that site?? How do you built it?

]]> By: Kris http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28578 Kris Tue, 02 Oct 2007 04:01:23 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28578 Someone should make an idiot-proof howto for this. I know virtually nothing about EEE, but I'd still like to be able to fiddle with the jtag port on my 2Wire 2700HGV router and some other hardware too :( I can't figure out how to do it manually with a multimeter/oscilloscope :( Someone should make an idiot-proof howto for this. I know virtually nothing about EEE, but I’d still like to be able to fiddle with the jtag port on my 2Wire 2700HGV router and some other hardware too :( I can’t figure out how to do it manually with a multimeter/oscilloscope :(

]]> By: DarkFader http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28577 DarkFader Tue, 02 Oct 2007 00:42:55 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28577 When I can't find the appropriate datasheets, I just find the most obvious 4 pins/pads, check out the impedance and do automatic checking of the 3 inputs. With just a parallel port.<br>Of course it becomes less obvious when dealing with more than 4 available pins/pads. When I can’t find the appropriate datasheets, I just find the most obvious 4 pins/pads, check out the impedance and do automatic checking of the 3 inputs. With just a parallel port.
Of course it becomes less obvious when dealing with more than 4 available pins/pads.

]]> By: phpCypher http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28576 phpCypher Mon, 01 Oct 2007 09:42:47 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28576 Yeah that is awesome !<br><br>This: <a href="http://nsa.unaligned.org/jrev.php" rel="nofollow">http://nsa.unaligned.org/jrev.php</a> deserves mention as well ;) Yeah that is awesome !

This: http://nsa.unaligned.org/jrev.php deserves mention as well ;)

]]> By: alex http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28575 alex Sun, 30 Sep 2007 21:27:35 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28575 This is awesome!<br><br>Funny enough, I was just looking for a JTAG pin detection method 1 day before this got posted.<br><br>I personally like the PIC18L2550 (it has a USB interface built-in). I may try implementing this just for fun. This is awesome!

Funny enough, I was just looking for a JTAG pin detection method 1 day before this got posted.

I personally like the PIC18L2550 (it has a USB interface built-in). I may try implementing this just for fun.

]]> By: Bhima http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28574 Bhima Sun, 30 Sep 2007 12:08:04 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28574 This is an idea that should of been up this way before and it's an idea that deserves a microcontroller. Actually as we've seen a few variations of the ultra low budget logic recorders... seeing a few variations of a JTAG pinout detector would be a cool thing.<br><br>I wonder who can develop the most functional detector that's the easiest to build! This is an idea that should of been up this way before and it’s an idea that deserves a microcontroller. Actually as we’ve seen a few variations of the ultra low budget logic recorders… seeing a few variations of a JTAG pinout detector would be a cool thing.

I wonder who can develop the most functional detector that’s the easiest to build!

]]> By: pc486 http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28573 pc486 Sun, 30 Sep 2007 02:15:16 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28573 This is a great project, but I'm not sure about the choice of microcontroller. It's clear that AT90USB would be better suited since it has a USB controller built in, no USBSerial gateway needed. Even the Cypress EZ-USB/FX2 would have been a good choice, and it has been around for a while. Both chips would achieve the future USB goal, and should perform much better since they can be clocked higher (16 MIPS for the AT90USB, 4 MIPS for the EZ-USB/FX2).<br><br>As for easy, right-now implementations, perhaps SparkFun's USB Bit Wacker board would suffice. It's a PIC 18F2455/18F2550 on a board for $25 assembled, $20 kit. Add in some glue and you're set. There's not enough pins for 30 wires at a time, but that can be fixed with a few extra ICs.<br><br>Anyway, great project. I'd love to hear success stories using this software. This is a great project, but I’m not sure about the choice of microcontroller. It’s clear that AT90USB would be better suited since it has a USB controller built in, no USBSerial gateway needed. Even the Cypress EZ-USB/FX2 would have been a good choice, and it has been around for a while. Both chips would achieve the future USB goal, and should perform much better since they can be clocked higher (16 MIPS for the AT90USB, 4 MIPS for the EZ-USB/FX2).

As for easy, right-now implementations, perhaps SparkFun’s USB Bit Wacker board would suffice. It’s a PIC 18F2455/18F2550 on a board for $25 assembled, $20 kit. Add in some glue and you’re set. There’s not enough pins for 30 wires at a time, but that can be fixed with a few extra ICs.

Anyway, great project. I’d love to hear success stories using this software.

]]> By: TheShagg http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28572 TheShagg Sun, 30 Sep 2007 01:57:28 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28572 Is it just me, or is the schematics link wrong? Is it just me, or is the schematics link wrong?

]]> By: tom61 http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28571 tom61 Sat, 29 Sep 2007 21:35:10 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28571 Nice. Why not just program the AVR to function as a JTAG programmer over USB once it has found the pins? Nice. Why not just program the AVR to function as a JTAG programmer over USB once it has found the pins?

]]> By: Myself http://hackaday.com/2007/09/29/automatic-jtag-pinout-detection/comment-page-1/#comment-28570 Myself Sat, 29 Sep 2007 19:00:20 +0000 http://hackaday.iheartcashews.com:8181/2007/09/29/automatic-jtag-pinout-detection/#comment-28570 ABOUT DAMN TIME, is all I can say! (and that would be all caps, if this infernal site didn't make all my first-person pronouns improper along with slaughtering my grammar!)<br><br>Seriously, good job, guys! I've tossed this idea around for a while and never got into it enough to implement it. Now, can it be expanded to ports that have extra unrelated pins? How much extra time would that add to the detection process? ABOUT DAMN TIME, is all I can say! (and that would be all caps, if this infernal site didn’t make all my first-person pronouns improper along with slaughtering my grammar!)

Seriously, good job, guys! I’ve tossed this idea around for a while and never got into it enough to implement it. Now, can it be expanded to ports that have extra unrelated pins? How much extra time would that add to the detection process?

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