NXP LPCXPRESSO51U68

Overview

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

LPCXpresso51U68

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.

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