Patrick Pollet

Important changes to forums and questions

All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.

11 years, 3 months ago.

LPC 800 Max : Resitors to change for the USB virtual com port

Hello,

Please, may you describe what are the resistors to change to enable the USB virtual com port ?

I just received a LPC800 max board and my first project with it needs the virtual com port :-)

Many thanks in advance.

Patrick

Question relating to:

Last updated: 30 Apr 2020
LPC800, LPC812M

5 Answers

ceri clatworthy
11 years, 3 months ago.

From the data sheet, I think you need to change:

/media/uploads/ceri/serial_jump.jpg

I am about to do this my self,

Will keep you posted !!

Ceri

Accepted Answer

It works, use:

Serial pc(P0_6, P0_1); // tx, rx

you will lose an I/O lien from the dweeno header (P0_6)

not sure where P0_0 goes ..

posted by ceri clatworthy 19 Sep 2013

It goes to INT form/to port expand

posted by ceri clatworthy 19 Sep 2013
Sergey Kucheryaviy
11 years, 2 months ago.

Hi, there! I am trying to "locate" my VCP, but it don't appear, even i resolder 1 and 4 jumpers to position "1-2" http://visualbooster.com/share/20131014194420783.png Any ideas? Thanks.

You also have to run and install the mbed serial port driver software on your pc while the board is plugged in with its usb cable.

posted by Wim Huiskamp 14 Oct 2013

Sergey, have you found your VCP? Which OS are you using?

posted by Kai Liu 15 Oct 2013

Yes, after installing drivers on my windows 8 x64 all works fine. Thank you for support. Best regards, Sergey!

posted by Sergey Kucheryaviy 15 Oct 2013
Kai Liu
11 years, 2 months ago.

Why they don't use jumper. There's enough space on board!

Adrian Ciołek
10 years, 10 months ago.

Hi, is it also required to make this modification to use lpc with rs232 port? I can't find any info about that

Patrick Pollet
poster
11 years, 3 months ago.

Yes, you are right, thanks. I missed that, searching for "real" resistors in the schematic.