NXP UM11057 LPCXpresso845MAX Board User Manual

NXP UM11057 LPCXpresso845MAX Board

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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.

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.

Table 1. Jumpers and connectors

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
Circuit reference| Description| Reference section
---|---|---
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

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.

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.

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”

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.

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.

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-windowsserial-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.

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.

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.

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

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).

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.

Table 5. PMod connector pin mappings (J3)

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.

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.

Power measurement
JP2 is provided to enable supply current to the LPC845 to be measured by placing an ammeter in line with JP2 pins. By default this jumper is bypassed by solder jumper (SJ6).
Header P1 may be installed to measure supply power to the LPC845 by measuring voltage drop across a 2.43 ohm resistor on the board.

Other board features

This section describes other board features not detailed elsewhere in this document.

ISP booting and the ISP button
The LPC845 can be forced into ISP boot mode by holding down the ISP button (SW1) and then holding and releasing reset. The ISP button is connected via a 100 ohm resistor to LPC845 pin PIO0_12, which is also routed to the LPCXpresso expansion connector (pin 45) and to the cathode of the red user LED. LPC845 pin PIO0_12 can be reconfigured by software so that the button can be used by an application as a general purpose button (refer to the LPC84x User Manual).

Wake button
The Wake button is for general purpose use by LPC845 applications. It is connected via a 100 ohm resistor to a 100K ohm pullup to 3.3V, and to the LPC845 PIO0_4 pin. This pin can wake the LPC845 from deep power-down. Note that PIO0_4 is also connected to the P3 LPCXpresso expansion connector (pin 50).

User LEDs
Three users LEDs are provided on the board, one blue, one green and one red. The anodes of the LEDs are connected together, through solder jumper SJ1 to the 3.3V regulator output. SJ1 can be opened to prevent leakage from the LPC845 pins through the diodes if accurate power measurement measurements are being performed. The LEDs are connected to the LPC845 as shown in Table 6.

Table 6. LED connections

Speaker driver

The LPC845 DACOUT output PIO0_29 is route to an IS31AP4991 speaker driver (see Integrated Silicon Solutions web site for datasheet). This device can drive 8 to 32 ohm
speakers; a 32 ohm speaker is supplied with the board and resistors have been selected to provide a reasonable volume level for musical tones. If desired, a capacitor can be added in parallel with the speaker driver feedback resistor, in order to reduce the speaker circuit bandwidth and reject DAC output sampling artifacts. This capacitor can be added using the through holes with circuit reference designator C26 (also called CAP NP in the schematic.)

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For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 9 June 2017
Document identifier: UM11057

References

• Windows serial configuration - Handbook | Mbed
• LPCXpresso845-MAX Board for LPC84x Microcontrollers (MCUs) | NXP Semiconductors
• LPC800 Code Bundles | NXP Semiconductors
• LPC800 Code Bundles | NXP Semiconductors

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