File content as of revision 0:febabd1da7f4:

#include "mbed.h"
#include "PowerControl/PowerControl.h"
#include "PowerControl/EthernetPowerControl.h"
// Need PowerControl *.h files from this URL
// http://mbed.org/users/no2chem/notebook/mbed-power-controlconsumption/
 
// Function to power down magic USB interface chip with new firmware
#define USR_POWERDOWN    (0x104)
int semihost_powerdown() {
    uint32_t arg;
    return __semihost(USR_POWERDOWN, &arg);
}

Ticker changer;
int count=1;

DigitalIn sw(p5);
PwmOut led(p25);

void change(){
    count = count << 1;
    if (count > 0x08) count = 0x01;
    if (1) {
        for (float p = 0.0f; p < 1.0f; p += 0.1f) {
               led = p;
               wait(0.1);
        }
    }
}

int main() {
    int result;
// Normal mbed power level for this setup is around 690mW
// assuming 5V used on Vin pin
// If you don't need networking...
// Power down Ethernet interface - saves around 175mW
// Also need to unplug network cable - just a cable sucks power
    
    //PHY_PowerDown();
 
// If you don't need the PC host USB interface....
// Power down magic USB interface chip - saves around 150mW
// Needs new firmware (URL below) and USB cable not connected
// http://mbed.org/users/simon/notebook/interface-powerdown/
// Supply power to mbed using Vin pin
    //result = semihost_powerdown();
// Power consumption is now around half
 
// Turn off clock enables on unused I/O Peripherals (UARTs, Timers, PWM, SPI, CAN, I2C, A/D...)
// To save just a tiny bit more power - most are already off by default in this short code example
// See PowerControl.h for I/O device bit assignments
// Don't turn off GPIO - it is needed to blink the LEDs
    //Peripheral_PowerDown(0xFFFF7FFF);
 
// use Ticker interrupt and Sleep instead of a wait for time delay - saves up to 70mW
// Sleep halts and waits for an interrupt instead of executing instructions
// power is saved by not constantly fetching and decoding instructions
// Exact power level reduction depends on the amount of time spent in Sleep mode
    changer.attach(&change, 0.0625);
    while (1) {
        Sleep();
    }
}