Original
Fork of PCA9547 by
PCA9547.cpp
- Committer:
- okano
- Date:
- 2015-02-23
- Revision:
- 6:33ef755248e0
- Parent:
- 5:f4f72501148a
- Child:
- 8:c716fb3ccb8d
File content as of revision 6:33ef755248e0:
/** * 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 * */ #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 ) { // do nothing. // leave it in default state. } PCA9547::PCA9547( I2C &i2c_, char i2c_address ) : i2c_p( NULL ), i2c( i2c_ ), i2c_addr( i2c_address ) { // do nothing. // leave it in default state. } PCA9547::~PCA9547() { if ( NULL != i2c_p ) delete i2c_p; } void PCA9547::select( char channel ) { char data = 0x08 | channel; i2c.write( i2c_addr, &data, 1 ); } void PCA9547::disable( void ) { char data = 0x00; i2c.write( i2c_addr, &data, 1 ); }