File content as of revision 0:378b1492eaf6:

// Calibrate and arm ESC and then sweep through motor speed range
// To run: Hold down reset on mbed and power up ESC motor supply
// Wait for three power up beeps from ESC, then release reset (or apply power) on mbed
// See https://github.com/bitdump/BLHeli/blob/master/BLHeli_S%20SiLabs/BLHeli_S%20manual%20SiLabs%20Rev16.x.pdf
// for info on beep codes and calibration
#include "mbed.h"
#include "Servo.h"
PwmOut ledf(LED1); //throttle up test led with PWM dimming
PwmOut ledr(LED2); //throttle down test led with PWM dimming

Servo myservo(p21);

int main()
{
    myservo = 0.0;
    ledf = ledr = 1;
    wait(0.5); //ESC detects signal
//Required ESC Calibration/Arming sequence  
//sends longest and shortest PWM pulse to learn and arm at power on
    myservo = 1.0; //send longest PWM
    ledf = ledr = 0;
    wait(8);
    myservo = 0.0; //send shortest PWM
    wait(8);
//ESC now operational using standard servo PWM signals
    while (1) {
        for (float p=0.0; p<=1.0; p += 0.025) { //Throttle up slowly to full throttle
            myservo = p;
            ledf = p;
            wait(1.0);
        }
        myservo = 0.0; //Motor off
        ledf = ledr = 0;
        wait(4.0);
        for (float p=1.0; p>=0.0; p -= 0.025) { //Throttle down slowly from full throttle
            myservo = p;
            ledr = p;
            wait(1.0);
        }
        myservo = 0.0; //Motor off
        ledf = ledr = 0;
        wait(4.0);
    }
}