LPC812 dev board and JTAG connection

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Andy Beveridge

• December 13, 2016 13:56

I fancy using LPC812 for a project so would like to play around with one on Crossworks with Crossconnect or a Segger J-link.

I do have an old LPCxpresso v1 (rev A). I see the note that says LPC-link V1 not supported but can use the board with external SWD is I connect pin1 of the SWD/J-tag to 3.3V (at my own risk).
Before I give that a go, what is the best way to power it then? Should I just plug in USB and let it take it's 5V and 3.3V power from that? Or should I put 5V on J2-pin2?
Do I need to disconnect anything else to stop the LPC-link interfering?
And is there really not a better LPC812 eval board (LPC812MAX just looks a mess)?

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  Andy Beveridge

  • December 13, 2016 14:14

  Oops. That should be 5V on J6 pin 2 (not J2).
  Or should I just give the board 3.3V on J6 pin 28?
  
  I would much rather just saw the LPC-link part of the board off to get rid of all that LPC3154 nonsense but if I do that I lose the swd connector and who knows what else. I'll settle for just getting it workign initially.
  Thanks

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  Jon Elliott

  • December 13, 2016 14:27

  I've just tried a board here and powering it off the USB seems to work OK.

   

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  Andy Beveridge

  • December 21, 2016 17:39
  • Edited

  Thanks Jon. It does indeed. It's working great.

  I've not been using Crossworks for a while (I've mostly been tinkering with ATMEL AVR and ARM based parts, working in Visual Studio). Blimey, what had I been missing? I had forgotten what a nice development environment it was.

  It's good to be back! Thanks again all at Rowley for a great set of tools.

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