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
Coming soon an LPC11U37 board
Re: Coming soon an LPC11U37 board
And the schematic--
Re: Coming soon an LPC11U37 board
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.
Re: Coming soon an LPC11U37 board
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.
Re: Coming soon an LPC11U37 board
I've launched this project on Kickstarter, kind of an experiment for me, I never tried that before.
Looking for feedback!
Looking for feedback!
Re: Coming soon an LPC11U37 board
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.
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.
Re: Coming soon an LPC11U37 board
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
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
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.
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
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.
There are 2 UARTs on the LPC11U3x series, the debug port for BASIC actually goes out the USB port not using either of those.