File content as of revision 1:c388983364cc:

/**
 *  PCA9547 library
 *      +++++ Based on; https://developer.mbed.org/users/okano/code/PCA9547/ +++++
 *
 *  @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
 *
 */

#include "PCA9547.h"



PCA9547::PCA9547( PinName sda, PinName scl, char i2c_address )
    : i2c_p( new I2C( sda, scl ) ), i2c( *i2c_p ), i2c_addr( i2c_address )
#ifdef PCA9547_RESET
    resetPin(PCA9547_RESET)
#endif
{
    this->init();
}

PCA9547::PCA9547( I2C &i2c_, char i2c_address )
    : i2c_p( NULL ), i2c( i2c_ ), i2c_addr( i2c_address )
#ifdef PCA9547_RESET
    resetPin(PCA9547_RESET)
#endif
{
    this->init();
}

void PCA9547::init()
{
#ifdef PCA9547_RESET
    resetPin= 1;
#endif
    return;
}

PCA9547::~PCA9547()
{
    if ( NULL != i2c_p )
        delete  i2c_p;
}

bool PCA9547::select(int ch)
{
    if(ch<0 || 7<ch)
        return false;
    ch += 0x08;
    char data= ch;
    int status= i2c.write( i2c_addr, &data, 1 );
    // if error occurred, status isn't 0 (0:success, other:err code).
    // in C++, 0: false, other: true.
    if(status == 0)
        return true;

#ifdef PCA9547_RESET
    resetPin= 0;
    wait_ms(1);
    resetPin= 1;
    wait_ms(1);
    status= i2c.write( i2c_addr, &data, 1 );
#endif
    return false;
}

void PCA9547::disable( void )
{
    char data= 0x00;
    i2c.write( i2c_addr, &data, 1 );
}

// EOF