Rapid Prototyping for USB devices, battery applications and low-cost 32-bit ARM® Cortex™-M0 based designs

Overview¶

The mbed Microcontrollers are a series of ARM microcontroller development boards designed for rapid prototyping.

• Find out more about all mbed Microcontrollers

The mbed NXP LPC11U24 Microcontroller in particular is designed for prototyping low cost USB devices, battery powered applications and 32-bit ARM® Cortex™-M0 based designs. It is packaged as a small DIP form-factor for prototyping with through-hole PCBs, stripboard and breadboard, and includes a built-in USB FLASH programmer.

The mbed Microcontrollers provide experienced embedded developers a powerful and productive platform for building proof-of-concepts. For developers new to 32-bit microcontrollers, mbed provides an accessible prototyping solution to get projects built with the backing of libraries, resources and support shared in the mbed community.

Features¶

• NXP LPC11U24 MCU
  • Low power ARM® Cortex™-M0 Core
  • 48MHz, 8KB RAM, 32KB FLASH
  • USB Device, 2xSPI, I2C , UART, 6xADC, GPIO
• Prototyping form-factor
  • 40-pin 0.1" pitch DIP package, 54x26mm
  • 5V USB, 4.5-9V supply or 2.4-3.3V battery
  • Built-in USB drag 'n' drop FLASH programmer
• mbed.org Developer Website
  • Lightweight Online Compiler
  • High level C/C++ SDK
  • Cookbook of published libraries and projects

Tools and Software¶

The mbed Microcontrollers are all supported by the mbed.org developer website, including a lightweight Online Compiler for instant access to your working environment on Windows, Linux or Mac OS X.

• Find out more about the mbed Online Compiler

Also included is a C/C++ SDK for productive high-level programming of peripherals. Combined with the wealth of libraries and code examples being published by the mbed community, the platform provides a productive environment for getting things done.

Examples¶

The mbed NXP LPC11U24 Microcontroller is particularly great for building USB devices. Here are some examples:

#include "mbed.h"
#include "USBMouse.h"

USBMouse mouse;

int main() {
    int16_t x = 0;
    int16_t y = 0;
    int32_t radius = 10;
    int32_t angle = 0;

    while (1) {
        x = cos((double)angle*3.14/180.0)*radius;
        y = sin((double)angle*3.14/180.0)*radius;
        mouse.move(x, y);
        angle += 3;
        wait(0.001);
    }
}

You can find more USB examples on our USBDevice page

The mbed NXP LPC11U24 is also good for prototyping low-power applications. Here the LPC11U24 is put to sleep and woken up by a button to increment and update a display before returning to sleep. The board is running off two AA's cells and drops to couple of milliamps when not is use.

#include "mbed.h"
#include "TextLCD.h"

TextLCD lcd(p21, p23, p24, p25, p26, p27);
InterruptIn wakeup(p14);

int i = 0;

void count() {
    lcd.locate (0,1);
    lcd.printf("%d",i);
    i++;
    wait(0.5);
}

int main () {
    wakeup.rise(NULL);  // Setup rising edge interrupt (no handler function needed)

    lcd.printf("Hello World!");

    while (1) {
        deepsleep();  // Deep sleep until external interrupt
        count();      // We've come out of sleep due to interrupt, so count!
    }
}

For both sleep() and deepsleep(), all state is retained so you can see it is a nice simple programming model. Should be great for quickly prototyping some things that need to run off batteries.

Firmware¶

• mbed Interface Firmware

Schematics and Data Sheets¶

mbed NXP LPC11U24 Microcontroller

• mbed NXP LPC11U24 Technical Flyer
• mbed NXP LPC11U24 Schematic

NXP LPC11U2x MCU

• NXP LPC11U24 Homepage
• NXP LPC11U2x Datasheet

See also¶

• mbed NXP LPC11U24 Getting Started
• Explore the mbed platform