LPCXpresso55S28

Board Overview

LPCXpresso55S28

Name:

lpcxpresso55s28

Vendor:

NXP Semiconductors

Architecture:

arm

SoC:

lpc55s28

Browse board sources

Overview

The LPCXpresso55S28 development board provides the ideal platform for evaluation of and development with the LPC552x/S2x MCU based on the Arm® Cortex®-M33 architecture. The board includes a high-performance onboard debug probe, audio subsystem and accelerometer, with several options for adding off-the-shelf add-on boards for networking, sensors, displays, and other interfaces.

Hardware

• LPC55S28 Arm® Cortex®-M33 microcontroller running at up to 150 MHz

• 512 KB flash and 256 KB SRAM on-chip

• Onboard, high-speed USB, Link2 debug probe with CMSIS-DAP and SEGGER J-Link protocol options

• UART and SPI port bridging from LPC55S28 target to USB via the onboard debug probe

• Hardware support for external debug probe

• 3 x user LEDs, plus Reset, ISP (3) and user buttons

• Micro SD card slot (4-bit SDIO)

• NXP MMA8652FCR1 accelerometer

• Stereo audio codec with line in/out

• High and full speed USB ports with micro A/B connector for host or device functionality

• MikroEletronika Click expansion option

• LPCXpresso-V3 expansion option compatible with Arduino UNO

• PMod compatible expansion / host connector

For more information about the LPC55S28 SoC and LPCXPresso55S28 board, see:

• LPC55S28 SoC Website

• LPC55S28 Datasheet

• LPC55S28 User Manual

• LPCXpresso55S28 Website

• LPCXpresso55S28 User Manual

• LPCXpresso55S28 Development Board Design Files

Supported Features

The lpcxpresso55s28 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.

lpcxpresso55s28

/

lpc55s28

lpcxpresso55s28/lpc55s28 target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M33F CPU1	arm,cortex-m33f
ADC	on-chip	LPC LPADC1	nxp,lpc-lpadc
ARM architecture	on-chip	LPC Flexcomm node6	nxp,lpc-flexcomm
Clock control	on-chip	LPC SYSCON & CLKCTL IP node1	nxp,lpc-syscon
DMA	on-chip	NXP LPC DMA controller1 1	nxp,lpc-dma
Flash controller	on-chip	NXP (In-Application Programming) flash memory controller for the lpc55xxx family, except lpc553x1	nxp,iap-fmc55
GPIO & Headers	on-chip	LPC GPIO1	nxp,lpc-gpio
	on-chip	LPC GPIO port device2	nxp,lpc-gpio-port
	on-board	GPIO pins exposed on Mikro BUS headers1	mikro-bus
	on-board	GPIO pins exposed on Arduino Uno (R3) headers1	arduino-header-r3
Hardware information	on-chip	NXP LPC 128-bit Unique identifier1	nxp,lpc-uid
I2C	on-chip	LPC I2C1	nxp,lpc-i2c
Input	on-board	Group of GPIO-bound input keys1	gpio-keys
Interrupt controller	on-chip	ARMv8-M NVIC (Nested Vectored Interrupt Controller)1	arm,v8m-nvic
	on-chip	NXP Pin interrupt and pattern match engine (PINT)1	nxp,pint
LED	on-board	Group of GPIO-controlled LEDs1	gpio-leds
MMU / MPU	on-chip	ARMv8-M MPU (Memory Protection Unit)1	arm,armv8m-mpu
MTD	on-chip	Flash node2	soc-nv-flash
	on-board	Fixed partitions of a flash (or other non-volatile storage) memory1	fixed-partitions
Pin control	on-chip	LPC I/O Pin Configuration (IOCON)1	nxp,lpc-iocon
	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
RNG	on-chip	LPC RNG (Random Number Generator)1	nxp,lpc-rng
Sensors	on-board	FXOS8700 6-axis accelerometer/magnetometer sensor1	nxp,fxos8700
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 SRAM description3	mmio-sram
Timer	on-chip	ARMv8-M System Tick1	arm,armv8m-systick
USB	on-chip	NXP LPCIP3511 USB device mode1	nxp,lpcip3511
Watchdog	on-chip	LPC Windowed Watchdog Timer1	nxp,lpc-wwdt

Note

For additional features not yet supported, please also refer to the LPCXPRESSO55S69 , which is the superset board in NXP’s LPC55xx series. NXP prioritizes enabling the superset board with NXP’s Full Platform Support for Zephyr. Therefore, the lpcxpresso55s69 board may have additional features already supported, which can also be re-used on this board.

Connections and IOs

The LPC55S28 SoC has IOCON registers, which can be used to configure the functionality of a pin.

Name	Function	Usage
PIO0_26	SPI	SPI MOSI
PIO0_29	USART	USART RX
PIO0_30	USART	USART TX
PIO1_1	SPI	SPI SSEL
PIO1_2	SPI	SPI SCK
PIO1_3	SPI	SPI MISO
PIO1_4	GPIO	RED LED
PIO1_6	GPIO	BLUE_LED
PIO1_7	GPIO	GREEN LED
PIO1_20	I2C	I2C SCL
PIO1_21	I2C	I2C SDA

System Clock

The LPC55S28 SoC is configured to use PLL1 clocked from the external 24MHz crystal, running at 144MHz as a source for the system clock. When the flash controller is enabled, the core clock will be reduced to 96MHz. The application may reconfigure clocks after initialization, provided that the core clock is always set to 96MHz when flash programming operations are performed.

Serial Port

The LPC55S28 SoC has 8 FLEXCOMM interfaces for serial communication. One is configured as USART for the console and the remaining are not used.

Programming and Debugging

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

Configuring a Debug Probe

LinkServer is the default runner for this board. A debug probe is used for both flashing and debugging the board. This board is configured by default to use the integrated MCU-Link Onboard Debug Probe in the CMSIS-DAP mode. To use this probe with Zephyr, you need to install the LinkServer Debug Host Tools and make sure they are in your search path. Refer to the detailed overview about Application Debugging for additional information.

The integrated MCU-Link hardware can also be used as a J-Link probe with a firmware update, as described in MCU-Link JLink Onboard Debug Probe. The J-Link Debug Host Tools should be available in this case.

Configuring a Console

Connect a USB cable from your PC to P6, and use the serial terminal of your choice (minicom, putty, etc.) with the following settings:

• 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 lpcxpresso55s28 samples/hello_world
west flash

Open a serial terminal, reset the board (press the RESET button), and you should see the following message in the terminal:

***** Booting Zephyr OS v2.4.0 *****
Hello World! lpcxpresso55s28

Debugging

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b lpcxpresso55s28 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 zephyr-v2.4.0 *****
Hello World! lpcxpresso55s28

Support Resources for Zephyr

• NXP Zephyr Downstream Software Development Kit

• MCUXpresso for VS Code, wiki documentation and Zephyr lab guides

• NXP Zephyr Knowledge Hub

• NXP’s Zephyr landing page (including training resources)

• NXP Support Community forum for Zephyr