File content as of revision 0:f0cf55dd23f6:

/*Library for SRF02 ultrasonic range finder*/
#include "SRF02.h"

SRF02::SRF02(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr){
    //no initialisation code required here
    }
    
SRF02::~SRF02(){

}

float SRF02::distancecm(){
    //local variables
    const char m_addr = 0xE0;  //srf02 default slave address
    char commandsequence[2];
    
    // Get range data from SRF02 in cm
        // Send Tx burst command over I2C bus
        commandsequence[0] = 0x00;               // Command register
        commandsequence[1] = 0x51;               // Ranging results in cm
        m_i2c.write(m_addr, commandsequence, 2); // Request ranging from sensor
        wait(0.07);  // Average wait time for sonar pulse and processing
        // Read back range over I2C bus
        commandsequence[0] = 0x02;                   // 
        m_i2c.write(m_addr, commandsequence, 1, 1);  // 
        m_i2c.read(m_addr, commandsequence, 2);             // Read two-byte echo result
        //combine upper and lower bytes in to a single value
        float range = ((commandsequence[0] << 8) + commandsequence[1]);
        return range;

}

float SRF02::distancein(){
    //local variables
    const char m_addr = 0xE0;  //srf02 default slave address
    char commandsequence[2];
    
    // Get range data from SRF02 in cm
        // Send Tx burst command over I2C bus
        commandsequence[0] = 0x00;               // Command register
        commandsequence[1] = 0x50;               // Ranging results in cm
        m_i2c.write(m_addr, commandsequence, 2); // Request ranging from sensor
        wait(0.07);  // Average wait time for sonar pulse and processing
        // Read back range over I2C bus
        commandsequence[0] = 0x02;                   // 
        m_i2c.write(m_addr, commandsequence, 1, 1);  // 
        m_i2c.read(m_addr, commandsequence, 2);             // Read two-byte echo result
        //combine upper and lower bytes in to a single value
        float range = ((commandsequence[0] << 8) + commandsequence[1]);
        return range;

}

float SRF02::distanceus(){
    //local variables
    const char m_addr = 0xE0;  //srf02 default slave address
    char commandsequence[2];
    
    // Get range data from SRF02 in cm
        // Send Tx burst command over I2C bus
        commandsequence[0] = 0x00;               // Command register
        commandsequence[1] = 0x52;               // Ranging results in cm
        m_i2c.write(m_addr, commandsequence, 2); // Request ranging from sensor
        wait(0.07);  // Average wait time for sonar pulse and processing
        // Read back range over I2C bus
        commandsequence[0] = 0x02;                   // 
        m_i2c.write(m_addr, commandsequence, 1, 1);  // 
        m_i2c.read(m_addr, commandsequence, 2);             // Read two-byte echo result
        //combine upper and lower bytes in to a single value
        float range = ((commandsequence[0] << 8) + commandsequence[1]);
        return range;

}