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Coming soon an LPC11U37 board

Posted: Fri Sep 29, 2017 5:13 pm
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 12087 times

Re: Coming soon an LPC11U37 board

Posted: Fri Sep 29, 2017 5:28 pm
by basicchip
And the schematic--
LPC11u37_2sch.jpg
LPC11u37_2sch.jpg (316.23 KiB) Viewed 12085 times

Re: Coming soon an LPC11U37 board

Posted: Fri Oct 06, 2017 10:41 pm
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 12070 times

Re: Coming soon an LPC11U37 board

Posted: Sun Oct 08, 2017 2:17 pm
by TrevorG
Great news. I've been using the previous version and I'll surely hop on the new one once it's out.

Re: Coming soon an LPC11U37 board

Posted: Tue Oct 24, 2017 11:06 pm
by basicchip
I've launched this project on Kickstarter, kind of an experiment for me, I never tried that before.

Looking for feedback!

Re: Coming soon an LPC11U37 board

Posted: Wed Oct 25, 2017 4:31 am
by basicchip

Re: Coming soon an LPC11U37 board

Posted: Wed Nov 01, 2017 4:18 pm
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.

Re: Coming soon an LPC11U37 board

Posted: Wed Nov 01, 2017 4:35 pm
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

Re: Coming soon an LPC11U37 board

Posted: Wed Nov 01, 2017 4:47 pm
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.

Re: Coming soon an LPC11U37 board

Posted: Wed Nov 01, 2017 4:53 pm
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.