UM11057
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2017. All rights reserved.
User Manual
Rev. 1.0 — 9 June 2017
8 of 14
NXP Semiconductors
UM11057
User Manual
4. Debug
Probe
The on-board LPC11U35 provides CMSIS-DAP debug probe functionality, plus a virtual
comm port (VCOM) capability via PIO1_16 and PIO1_17 of the LPC845 target. This
functionality bridges the LPC845 serial port via USB, so that PC applications such as
TeraTerm and PuTTY can communicate directly with the target.
Initial production boards have been programmed with firmware based from mbed, so
require the mbed serial port driver to be installed while the board is attached in order to
run correctly. See:
http://mbed.org/handbook/Windows-serial-configuration#1-download-the-mbed-windows-
serial-port
for more information. Note that the LPCXpresso845MAX is not an mbed
certified platform, and does not support drag and drop programming of the LPC845 target.
When using the mbed firmware image, the VCOM settings used should be 9600 baud, 8
bits, no parity, 1 stop bit, no flow control.
Later production LPCXpresso845MAX boards have been programmed with an updated
version of CMSIS-DAP, and a standard UART VCOM port. It is recommended that the
LPC11U35 firmware be updated to the latest version available on the LPCXpresso845
board page, under the Software and Tools tab. See
Section 3.1
for information on how to
update the debug probe firmware.
The CMSIS, DISK and COMM LEDs are connected to the LPC11U35 device. The
behavior of the LEDs will vary depending on firmware used, typically the CMSIS LED will
blink when debug communication is occurring, and the COMM LED will blink when data is
being transferred over the VCOMM port.
The board design includes pads for an external debug probe to be connected to the
LPC11U35 (connector P5). This connector is not installed, and is not intended for
customer use.
4.1 Using an external debug probe
An external debug probe that supports ARM’s SWD interface, such as an LPC-Link2
(OM13054), SEGGER J-Link or PE Micro probe, can be used with the
LPCXpresso845MAX board. The external probe must be connected to header P4. When
an external debug probe is used, the on-board probe must be held in reset by placing a
jumper on JP1. It is recommended that JP1 is fitted before powering the board.