Jtag Pin Finder

Here you can put bug report of USB JTAG/BDM or features or device you want to support. Please submit wish list only. Other topics will moved out from this forum
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haute1
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Joined: Sun Nov 10, 2019 8:06 am

Jtag Pin Finder

Post by haute1 »

I have seen that in the new software there is already a jtag search mode, can you upload a video to YouTube doing a demonstration?
Can you use usbjtagNT for this? or u-link is necessary
Thank you
usbbdm
Junior Member
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Joined: Mon Jul 18, 2005 9:33 pm

Re: Jtag Pin Finder

Post by usbbdm »

OK I will do that. The first release might not be perfect yet.
It is only in u-Link Hardware.
When scanning the pins, each pin needs to be pulled high and low while USB JTAG NT can only have two programmable pins.
I think I need to exclude TRST scanning as an option since not all the JTAG port has TRST pin implemented.
But I will release a video today to show how it works.
haute1
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Joined: Sun Nov 10, 2019 8:06 am

Re: Jtag Pin Finder

Post by haute1 »

Thanks for the support, the trst pin, you could leave it as optional, if you want to scan with that pin or not.
usbbdm
Junior Member
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Joined: Mon Jul 18, 2005 9:33 pm

Re: Jtag Pin Finder

Post by usbbdm »

Found some bug today. Will release the software first before the video.
haute1
Junior Member
Posts: 4
Joined: Sun Nov 10, 2019 8:06 am

Re: Jtag Pin Finder

Post by haute1 »

ok, thx
I think that the jtag finder is one of the best features that this new cable can offer.
usbbdm
Junior Member
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Joined: Mon Jul 18, 2005 9:33 pm

Re: Jtag Pin Finder

Post by usbbdm »

Just upload the 1.03 and youtube video. https://youtu.be/1KCrgPAiC1g.
Please test and let me know for any improvement can be made.
haute1
Junior Member
Posts: 4
Joined: Sun Nov 10, 2019 8:06 am

Re: Jtag Pin Finder

Post by haute1 »

Thanks for the demonstration.
I'm sorry, but I can't do tests, because I don't have the u-link cable, I only have the 2 previous versions of jtag NT.
Regarding the working voltage, it would be good to use a pin as input Vref, to adjust the rest to that voltage.
Depending on the SoC or cpu, it can work between 1.2v and 5v.
I don't know if u-link has that voltage range.
This can be done in 2 ways. With a command selecting the working voltage of the u-link, and another through an entry in a pin like Vref.
usbbdm
Junior Member
Posts: 8962
Joined: Mon Jul 18, 2005 9:33 pm

Re: Jtag Pin Finder

Post by usbbdm »

3.3v and 5V has no problem.
1.8V might work. 1.2v will not work.
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