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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.

`lpcxpresso51u68/lpc51u68` target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M0+ CPU1	`arm,cortex-m0+`
ARM architecture	on-chip	LPC Flexcomm node5	`nxp,lpc-flexcomm`
Clock control	on-chip	LPC SYSCON & CLKCTL IP node1	`nxp,lpc-syscon`
GPIO & Headers	on-chip	LPC GPIO1	`nxp,lpc-gpio`
GPIO & Headers	on-chip	LPC GPIO port device2	`nxp,lpc-gpio-port`
I2C	on-chip	LPC I2C1	`nxp,lpc-i2c`
Input	on-board	Group of GPIO-bound input keys1	`gpio-keys`
Interrupt controller	on-chip	ARMv6-M NVIC (Nested Vectored Interrupt Controller) controller1	`arm,v6m-nvic`
Interrupt controller	on-chip	NXP Pin interrupt and pattern match engine (PINT)1	`nxp,pint`
LED	on-board	Group of GPIO-controlled LEDs1	`gpio-leds`
MTD	on-chip	Flash node1	`soc-nv-flash`
Pin control	on-chip	LPC I/O Pin Configuration (IOCON)1	`nxp,lpc-iocon`
Pin control	on-chip	LPC pinctrl node1	`nxp,lpc-iocon-pinctrl`
PWM	on-chip	NXP SCTimer PWM1	`nxp,sctimer-pwm`
Reset controller	on-chip	LPC SYSCON Peripheral reset controller1	`nxp,lpc-syscon-reset`
Serial controller	on-chip	LPC USART1	`nxp,lpc-usart`
SPI	on-chip	NXP LPC SPI controller1	`nxp,lpc-spi`
SRAM	on-chip	Generic on-chip SRAM2	`mmio-sram`
Timer	on-chip	ARMv6-M System Tick1	`arm,armv6m-systick`

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	attach	debugserver	rtt
jlink	✅ (default)	✅ (default)	✅	✅	✅

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