Coming soon an LPC11U37 board

What products would you like to see?
basicchip
Posts: 1090
Joined: Fri Oct 19, 2012 2:39 am
Location: Weeki Watchee, FL
Contact:

Coming soon an LPC11U37 board

Post by basicchip »

A previous version of this was used as a JTAG demo, and a new version is being built now. It will use an LPC11U37 which will have-

- micro USB connection
- mBed compatible programming
- option to do USB to serial conversion
- option for JTAG master for CMSIS debugging
- option for target JTAG debugging
- 48 pins for all LPC11U37 pins to be brought out, 40 IOs
- 24 pin compatible pin out with BASIC stamp
LPC11u37_2.jpg
LPC11u37_2.jpg (241.48 KiB) Viewed 21696 times



basicchip
Posts: 1090
Joined: Fri Oct 19, 2012 2:39 am
Location: Weeki Watchee, FL
Contact:

Re: Coming soon an LPC11U37 board

Post by basicchip »

And the schematic--
LPC11u37_2sch.jpg
LPC11u37_2sch.jpg (316.23 KiB) Viewed 21694 times

basicchip
Posts: 1090
Joined: Fri Oct 19, 2012 2:39 am
Location: Weeki Watchee, FL
Contact:

Re: Coming soon an LPC11U37 board

Post by basicchip »

Built up the first 2 and checked them out. Looking good the final version will tweak some components and add a JTAG/SW land pattern supporting both target and master debugging.
rev2.jpg
rev2.jpg (476.02 KiB) Viewed 21679 times

TrevorG
Posts: 1
Joined: Thu Sep 28, 2017 2:35 pm

Re: Coming soon an LPC11U37 board

Post by TrevorG »

Great news. I've been using the previous version and I'll surely hop on the new one once it's out.
This is why ExpressVPN is so good and works so well.

basicchip
Posts: 1090
Joined: Fri Oct 19, 2012 2:39 am
Location: Weeki Watchee, FL
Contact:

Re: Coming soon an LPC11U37 board

Post by basicchip »

I've launched this project on Kickstarter, kind of an experiment for me, I never tried that before.

Looking for feedback!

basicchip
Posts: 1090
Joined: Fri Oct 19, 2012 2:39 am
Location: Weeki Watchee, FL
Contact:

Re: Coming soon an LPC11U37 board

Post by basicchip »


olzeke51
Posts: 414
Joined: Sat May 17, 2014 4:22 pm
Location: South Carolina

Re: Coming soon an LPC11U37 board

Post by olzeke51 »

Hi Bruce,
Enjoyed the kickstarter website and the short videos - very informative. I ordered/pledged one unit.
I am assuming kickstarter doesn't allow too many links to your company website- as I didn't see too many;
maybe on the pledge page.
Your bio page doesn't mention your fairly recent past work with ...... -- is that a NDA agreement thing??
'
Anyway, good luck.
Gary Z.
Last edited by olzeke51 on Wed Nov 01, 2017 4:36 pm, edited 1 time in total.

olzeke51
Posts: 414
Joined: Sat May 17, 2014 4:22 pm
Location: South Carolina

Re: Coming soon an LPC11U37 board

Post by olzeke51 »

Hey again,
I don't see GND or V3.3 traces going to their pins in the layout picture above.
Also-
the schematic Jtag TDI & TDO pins don't seem to match the document
Rev. 2.3 — 8 February 2017 Product data sheet -- page 12 indicates to me
TDI is on chip pin 42 (P23)
TDO is on chip pin 28 (P34)
Also-
page 4 indicates that there is only 1 USART
You indicate RXD/TXD0 going to the PBasic chip but there is also a your
refence to RXD/TXD1 - are you doing a bit-banging or using a SSP function??
'
Hey - I'm a hardware guy mostly. --
HTH - Gary

basicchip
Posts: 1090
Joined: Fri Oct 19, 2012 2:39 am
Location: Weeki Watchee, FL
Contact:

Re: Coming soon an LPC11U37 board

Post by basicchip »

That layout was the one used to build some early prototypes, the ones used in the Kickstart videos.

The final one does connect GND and V33 to the outer 24 pins, and moves a couple pins around. Such that no special purpose pins are in the 24 pin stamp portion. (no open drain, or SW debug).

A nearly final layout and schematic is at the Kickstart page, I'll bring those all back here after that. In addition I moved the jumpers for SW/JTAG to the topside and put them all in a 8 pin jumper block. Those jumpers switch from JTAG master to target.

basicchip
Posts: 1090
Joined: Fri Oct 19, 2012 2:39 am
Location: Weeki Watchee, FL
Contact:

Re: Coming soon an LPC11U37 board

Post by basicchip »

TDI and TDO are only used when the board is acting as a master, those match the CMSIS-DAP software from NXP. In target (or politically incorrect slave) mode only SW debug is supported.

There are 2 UARTs on the LPC11U3x series, the debug port for BASIC actually goes out the USB port not using either of those.

Post Reply