This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down list at the bottom of the left panel and select the desired version.

NXP LPCXPRESSO51U68

Overview

The LPCXpresso51u68 development board uses an NXP LPC51U68 MCU based on an ARM CORTEX-M0+ core.

Hardware

LPC51U68 M0+ running at up to 150 MHz
Memory
- 256KB of flash memory
- 96KB of SRAM
On-board high-speed USB based debug probe with CMSIS-DAP and J-Link protocol support, can debug the on-board LPC51U68 or an external target
External debug probe option
Tri-color LED, target reset, ISP & interrupt/user buttons for easy testing of software functionality
Expansion options based on Arduino UNO and PMOD™, plus additional expansion port pins
FTDI UART Connector

More information can be found here:

Supported Features

The lpcxpresso51u68 support the following features:

Interface	Controller	Driver/Component
NVIC	on-chip	nested vector interrupt controller
SYSTICK	on-chip	systick
IOCON	on-chip	pinmux
CLOCK	on-chip	clock and reset control
GPIO	on-chip	gpio
I2C	on-chip	i2c master/slave controller
UART	on-chip	serial port-polling; serial port interrupt
SPI	on-chip	SPI master

Other hardware is not yet supported on Zephyr.

Connections and IOs

The IOCON controller can be used to configure the LPC51U68 pins.

Name	Function	Usage
PIO0_0	UART	USART RX
PIO0_1	UART	USART TX
PIO1_10	GPIO	GREEN LED
PIO0_29	GPIO	RED LED
PIO1_9	GPIO	BLUE_LED
PIO0_25	I2C	I2C SCL
PIO0_26	I2C	I2C SDA
PIO0_18	SPI	SPI MISO
PIO0_19	SPI	SPI SCK
PIO0_20	SPI	SPI MOSI
PIO1_1	SPI	SPI SSEL2

Programming and Debugging

Build and flash applications as usual (see Building an Application and Run an Application for more details).

Configuring a Debug Probe

A debug probe is used for both flashing and debugging the board. This board is configured by default to use the LPC-Link2 CMSIS-DAP Onboard Debug Probe, however the pyOCD Debug Host Tools do not support this probe so you must reconfigure the board for one of the following debug probes instead.

LPC-Link2 J-Link Onboard Debug Probe 

Install the J-Link Debug Host Tools and make sure they are in your search path.

Follow the instructions in LPC-Link2 J-Link Onboard Debug Probe to program the J-Link firmware.

Configuring a Console

Connect a USB to FTDI RX, TX & GND pins to P3 Connector.

Use the following settings with your serial terminal of choice (minicom, putty, etc.):

Speed: 115200
Data: 8 bits
Parity: None
Stop bits: 1

Flashing

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b lpcxpresso51u68 samples/hello_world
west flash

***** Booting Zephyr OS build zephyr-v2.6.0-934-g4c438c0c7d13 *****
Hello World! lpcxpresso51u68

Debugging