File content as of revision 0:313dfeed320a:

/**
 ******************************************************************************
 * @project  Web Piano 
 * @author  Justin Kim
 * @version V1.0.0
 * @date    03-JUL-2015
 * @brief   Main program body
*******************************************************************************
**/
/* Includes ------------------------------------------------------------------*/
#include "pwm_tone.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
int stop_flag;          //Auto tunes stop flag

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/**
   * @brief     Tune Function
   * @param  name : Choose the PwmOut
                    period : this param is tune value. (C_3...B_5)
   * @retval    None
   */
void Tune(PwmOut name, int period)
{
    name.period_us(period);
    name.write(0.50f); // 50% duty cycle
    wait(1); // 1 beat
    name.period_us(0); // Sound off
}

/**
   * @brief     Auto tunes Function
   * @param  name : Choose the PwmOut
                    period : this param is tune value. (C_3...B_5)
                    beat : this param is beat value. (1..16) 1 means 1/16 beat
   * @retval    None
   */
void Auto_tunes(PwmOut name, int period, int beat)
{    
    int delay;
    
    if(stop_flag)
    {
        Stop_tunes(name);
    }
    delay = beat*63;
    name.period_us(period);
    name.write(0.50f); // 50% duty cycle
    wait_ms(delay);
}

/**
   * @brief     Stop tunes Function
   * @param  name : Choose the PwmOut
   * @retval    None
   */
void Stop_tunes(PwmOut name)
{
    name.period_us(0);
}