NXP Semiconductors UM11057 LPCXpresso845MAX User manual

UM11057
LPCXpresso845MAX
Rev. 1.0 — 9 June 2017 User Manual
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Keywords LPCXpresso845MAX, OM13097, LPC845, LPC844
Abstract LPCXpresso845MAX User Manual

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For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
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Revision history
Rev Date Description
1.0 20170526 First draft

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1. Introduction
The LPCXpresso-MAX family of boards provides a powerful and flexible development
system for NXP's low end Cortex-M0+ MCUs. They can be used with a range of
development tools, including the MCUXpresso IDE toolchain. The LPCXpresso845MAX
board is developed by NXP to enable evaluation of and prototyping with the LPC84x
family of MCUs. Figure 1 shows the LPCXpresso845MAX Board.
The LPCXpresso845MAX board includes the following features:
•Compatible with MCUXpresso IDE and other popular toolchains (incl. IAR and Keil).
•On-board CMSIS-DAP (debug probe) with VCOM port, based on LPC11U35 MCU.
•Debug connector to allow debug of target MCU using an external probe.
•Red, Green and Blue User LEDs.
•Target ISP and User/Wake buttons.
•Target Reset button.
•LPCXpresso expansion connector.
•DAC output via speaker driver and speaker.
•Arduino connectors compatible with the “Arduino UNO” platform.
•Pmod® compatible expansion header.
•Prototyping area.
Fig 1. LPCXpresso845MAXBoard

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2. Board Layout
Figure 2 below shows the layout of the LPCXpresso845MAX board, indicating location of
jumpers, buttons, connectors/expansion options and MCU devices.
Table 1 shows the layout of the LPCXpresso845MAX board, indicating location of
jumpers, buttons, connectors/expansion options and MCU devices.
Fig 2. Board layout (top silkscreen)
Table 1. Jumpers and connectors
Circuit reference Description Reference section
JP1 Inserting a jumper on JP1 holds the LPC11U35 debug probe in reset.
Install JP1 when using an external debug probe.
Section 4.1
JP2 Ammeter connection. After removal of SJ6, an ammeter can be installed
between the pins of JP2 to measure current flow to the LPC845. Once
SJ6 has been removed, JP2 must either be installed or an ammeter in
place in order for the LPC845 to be powered.
Section 6
JP3 LPC11U35 Device Firmware Update (DFU) mode enable. Install JP3
before powering up the board via USB in order to place the LPC11U35 in
DFU mode (thus enabling software update via drag and drop
programming on a host computer.)
Section 3.1
P1 Power measurement point. Connect a voltmeter across P1 to measure
voltage drop across a 2.43 ohm resistor connected in-line with the supply
to the LPC845 device.
Section 6
P2 VREFP/VREFN header connection. By default, VREFP of the LPC845 is
connected to the 3.3V regulator output, and VREFN to ground. By
removing connection 1-2 on SJ9 and bridging pads 2-3 instead, VREFP
can be injected via pin 1 of header P2. By removing connection 1-2 on
SJ8 and bridging pads 2-3 instead, VREFN can be injected via pin 3 of
header P2.
n/a

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P3 LPCXpresso expansion connector. Section 5.3
P4 External SWD debug connector for LPC845. Section 4.1
P5 External SWD debug connector for LPC11U35 (not installed, would be
mounted on underside of PCB.)
Section 4
P6 Once SJ18 has been removed, P6 can be used to connect/disconnect the
LPC845 UART TX from the LPC11U35 debug probe (VCOMM
connection).
Section 5.3
P7 Once SJ17 has been removed, P7 can be used to connect/disconnect the
LPC845 UART RX from the LPC11U35 debug probe (VCOMM
connection).
Section 5.3
J1, J2, J5, J6 Arduino expansion connectors. Section 5.1
J3 PMod-compatible header. Section 5.2
J4 USB connector for debug probe / board power. Section 4
Table 1. Jumpers and connectors
Circuit reference Description Reference section

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3. Getting Started
The LPCXpresso845MAX board is pre-programmed with a simple program to blink a user
LED, indicating that the target MCU is running. Connect a micro USB cable from
connector J4 to a host computer or power supply to power up the board and run this
program.
The rest of this section describes how to set up your board for use with MCUXpresso IDE
and/or third party tools.
3.1 Debugger firmware update
The LPCXpresso845MAX board comes pre-programmed with a CMSIS-DAP firmware
image. Early production boards are programmed with firmware based on the mbed
CMSIS-DAP port which requires installation of the mbed serial port driver on Windows
platforms before the board can be used (note that the LPCXpresso845 board is not mbed
enabled). Later boards do not require this driver installation, and it is recommended that
the latest debugger firmware is downloaded onto the board before starting a debug
session. The debugger firmware is available from http://nxp.com/demoboard/om13097
under the Software and Tools tab (look under “Software” download types).
After downloading the debugger firmware image (which will be called firmware.bin), follow
these steps:
1. With the board unpowered, install jumper JP3.
2. Power the board. Using File Explorer (or equivalent on Mac/Linux platforms), look at
the available drives on your system. A device called CRP_DISABLED will appear.
3. Delete the firmware.bin file on the CRP_DISABLED drive.
4. Drag and drop the firmware.bin file you downloaded from nxp.com on to the
CRP_DISABLED drive.
5. Remove JP3, unplug then repower the board.
6. The board should now enumerate on your system - allow 20-30 seconds for this to
complete.
3.2 Using the board with MCUXpresso IDE
Once the board debugger firmware has been installed (as described in Section 3.1), to
use the board during a debug session in MCUXpresso IDE, connect to the host computer
then follow the steps below.
Note that MCUXpresso IDE has built-in knowledge of the LPC84x part family, so does not
require any SDK installation steps. Follow the steps below to build and run a simple
example from the LPC84x Code Bundles provided by NXP.
Code Bundles for the LPC8xx family are included in the MCUXpresso IDE installation.
These can also be downloaded from nxp.com (in case of any updates between IDE
releases): https://www.nxp.com/LPC800-Code-Bundles. (Note that MCUXpresso IDE has
a link to the Code Bundle Page in the Help -> Additional Resources menu).
1. Open a new workspace in the IDE.
2. In the Quickstart panel of the IDE, click in “Import project(s) from the file system”

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3. In the “Import project(s) from file system...” dialog box that opens, click “Browse...” in
the Project Archive (from zip) section, and select the LPC84x Code Bundle zip file
from the Code Bundles directory in the MCUXpresso IDE installation (or select a
version downloaded from nxp.com, as described in Step 1 above.) Click “Next >” on
the “Import project(s) from file system...” dialog to continue.
4. You will see several projects listed in the Code Bundle; click “Finish” to import them
all.
5. The dialog box will close, and you will see the imported projects in the Project tab at
the upper left window of the IDE. Click on Example_Multi_Timer_Blinky to select it,
then select Build from the Quickstart panel. You will see the build processing in the
Console window to the right of the Quickstart panel. The projects are set up to include
dependency checking, so the build process will automatically build the utility and
peripheral libraries as well as the example program.
6. Ensuring the LPCXpresso845MAX is connected to the host computer, click Debug in
the Quickstart panel. The IDE will search for available debug probes. Select the
debug probe that appears for your board, then click OK. Note that the IDE will
remember your selection for the next time you debug this project, so will not prompt
for this again, unless it cannot find the board.
7. The code will execute to main. Press F8 to resume and run the program. You will now
see the User LEDs light, each color in turn.
3.3 Using LPCXpresso845MAX with 3rd Party IDEs
Once the board debugger firmware has been installed (as described in Section 3.1), to
use the board during a debug session in MCUXpresso IDE, it can be used with 3rd party
development tools. Set up will vary between Development Tools, but the board debug
probe should be supported as a CMSIS-DAP probe in all cases).
Code Bundles, including sample projects for Keil MDK and IAR EWARM, are available
from NXP’s website at
http://www.nxp.com/products/software-and-tools/software-development-tools/software-to
ols/lpc800-code-bundles:LPC800-Code-Bundles. Refer to the readme files provided with
each code bundle in order to build/debug.
When using Keil MDK, install the Device Pack for the LPC84x (version 1.5 or later) before
attempting to use the board.
When using IAR EWARM, ensure that you have version 8.12.2 or later in order to have
LPC84x device family support.

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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.

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5. Expansion connectors/headers
The LPCXpresso845MAX board provides multiple options to add additional circuitry or off
the shelf expansion boards; this section describes these options. For further details
please refer to the board schematics.
5.1 Arduino UNO Rev 3 expansion connectors
The Arduino UNO Rev 3 compatible connectors provided on the LPCXpresso845MAX
board provide I2C, SPI, UART, PWM and analog function connections to shield boards
that are available from various 3rd part suppliers, or for customer use. The pin mappings
are shown in the tables below. Some connections are shared with the LPCXpresso
connector (P3), as shown.
Table 2. Arduino expansion connector pin mappings (Digital connector J1)
J1 Pin Arduino signal LPC845 pin LPCXpresso connector pin
1 I2C SCL PIO0_10 41
2 I2C SDA PIO0_11 40
3 AREF n/a (3.3V) n/a
4 GND n/a (GND) n/a
5 SPI SCK PIO0_6 7
6 SPI MISO PIO0_7 6
7 SPI MOSI PIO1_19 5
8 SPI SSEL PIO1_18 42
9 PWM PIO1_14 n/a
10 PIO0_16 n/a
Table 3. Arduino expansion connector pin mappings (Digital connector J2)
J2 pin Arduino signal LPC845 pin LPCXpresso connector pin
1 PIO0_1 43
2 PWM PIO0_28 n/a
3 PWM PIO1_20 n/a
4 PIO1_21 n/a
5 INT/PWM PIO0_20 n/a
6 INT PIO0_21 n/a
7 TX PIO0_25 48
8 RX PIO0_24 49
Table 4. Arduino expansion connector pin mappings (Analog connector J6)
J1 Pin Arduino signal LPC845 pin LPCXpresso connector pin
1 A0 PIO0_14 15
2 A1 PIO0_23 16
3 A2 PIO0_19 17
4 A3 PIO0_18 19
5 A4 PIO0_17 20
6 A5 PIO0_29 18

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Note that the default ports for ISP boot are connected to J1 (I2C) J2 (USART).
The Arduino power connector (J5) pin 2 (IOREF) and pin 3 (+3V3) are routed to the 3.3V
regulator output. J5 pin 5 (5V) is routed to the 5V supply from USB. J5 pin 8 (VIN) can
also be connected to this 5V supply by closing solder jumper SJ16 (this connection is
required by some Arduino shields).
5.2 PMod connector
The LPCXpresso845MAX board is designed to accommodate a 0.1” header for PMod
compatible boards (the header is not installed during manufacture). The circuit reference
for this header is J3. The board provides SPI, I2C and GPIO connections from the
LPC845 target, each signal routed via a 100 ohm connector to prevent accidental
damage.
5.3 LPCXpresso expansion connector (P3)
The LPCXpresso expansion connector follows the signal / port mappings common to
other MAX-style LPCXpresso, LPCXpresso V2, LPCXpresso-CD and the original
LPCXpresso boards. Refer to the schematic for a full list of pin connections.
The USART connections from LPC845 that are routed to the LPC11U35 debug probe are
also present on P3 (pins 13 & 14). If using P3 to access this peripheral, disconnect the
debug probe connections by removing SJ17 and SJ18. Note that if SJ17 and SJ18 are
removed then headers P6 and P7 may be installed to provide a convenient way of
connecting/disconnecting the USART to the debug probe.
5.4 Prototyping area
A prototyping (or “breadboarding”) area is provided, adjacent to the PMod connector,
made up of 20 holes. The top row (TP1 through TP4) are connected to the 3.3V regulator
output, and the bottom row (TP17 through 20) are connected to ground. The remaining
holes (TP5 through TP16) are not connected to anything else on the board.
Table 5. PMod connector pin mappings (J3)
J3 Pin PMod signal LPC845 pin
1 SPI SSEL PIO0_22
2 SPI MOSI PIO0_27
3 SPI MISO PIO0_26
4 SPI SCK PIO0_15
7 GPIO PIO1_10
8 GPIO PIO0_13
9 I2C SCL PIO1_12
10 I2C SDA PIO1_13