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 board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

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

The lpcxpresso51u68 board supports the runners and associated west commands listed below.

flash debug

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.

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

Here is an example for the Hello World application.

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

Open a serial terminal, step through the application in your debugger, and you should see the following message in the terminal:

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

Support Resources for Zephyr