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/**
 *  PCA9547 library
 *
 *  @author  Tedd OKANO
 *  @version 0.2
 *  @date    Feb-2015
 *
 *  PCA9547: an I2C bus multiplexer control library
 *
 *  PCA9547 is an I2C multiplexer which enables to select 1:8 multiplexed I2C bus.
 *  The multiplexer is useful for deviding I2C bus to avoiding slave address conflict and separating capacitive loads.
 *
 *  For more information about PCA9547:
 *    http://www.nxp.com/documents/data_sheet/PCA9547.pdf
 *
 */

#ifndef MBED_PCA9547_H
#define MBED_PCA9547_H

#include "mbed.h"

/** PCA9547 class
 *
 *  PCA9547: an I2C bus multiplexer control library
 *
 *  PCA9547 is an I2C multiplexer which enables to select 1:8 multiplexed I2C bus.
 *  The multiplexer is useful for deviding I2C bus to avoiding slave address conflict and separating capacitive loads.
 *
 *  For more informatioj about PCA9547:
 *    http://www.nxp.com/documents/data_sheet/PCA9547.pdf
 *
 *  Example:
 *  @code
 *  #include "mbed.h"
 *  #include "LM75B.h"
 *  #include "PCA9547.h"
 *
 *  PCA9547 mux( p28, p27, 0xE0 );
 *
 *  int main()
 *  {
 *      mux.select( 0 );
 *
 *      LM75B   tmp0( p28, p27 );   //  making instance after a branch of I2C bus (which is connecting the LM75B) enabled
 *
 *      while(1) {
 *          printf( "%.3f\r\n", tmp0.read() );
 *          wait( 1.0 );
 *      }
 *  }
 *  @endcode
 */

class PCA9547
{
public:

    /** Create a PCA9547 instance connected to specified I2C pins with specified address
     *
     * @param sda I2C-bus SDA pin
     * @param scl I2C-bus SCL pin
     * @param i2c_address I2C-bus address (default: 0xE0)
     */
    PCA9547( PinName sda, PinName scl, char i2c_address = 0xE0 );

    /** Create a PCA9546A instance connected to specified I2C pins with specified address
     *
     * @param &i2c_ I2C object (instance)
     * @param i2c_address I2C-bus address (default: 0xE0)
     */
    PCA9547( I2C &i2c_, char i2c_address = 0xE0 );

    /** Destructor of PCA9547
     */
    ~PCA9547();

    /** Channel select
     *
     *  Enable and select a channel
     *
     * @param channel channel number
     */
    void select( char channel );

    /** Disabling all channels
     *
     *  Disable all channels
     */
    void disable( void );

private:
    I2C     *i2c_p;
    I2C     &i2c;
    char    i2c_addr;
};

#endif  //  MBED_PCA9547_H