Adaptation for PCA9548 Nxp I2C switch
Fork of PCA9547 by
Diff: PCA9548A.cpp
- Revision:
- 9:2fcf9622c207
- Parent:
- 8:c716fb3ccb8d
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/PCA9548A.cpp Wed Mar 22 09:34:59 2017 +0000 @@ -0,0 +1,52 @@ +/** + * PCA9548A library + * + * @author Tedd OKANO + * @version 0.2 + * @date Feb-2015 + * + * PCA9548A: an I2C bus multiplexer control library + * + * PCA9548A 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 PCA9548A: + * http://www.nxp.com/documents/data_sheet/PCA9548A.pdf + * + */ + +#include "PCA9548A.h" + +PCA9548A::PCA9548A( 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. +} + +PCA9548A::PCA9548A( I2C &i2c_, char i2c_address ) + : i2c_p( NULL ), i2c( i2c_ ), i2c_addr( i2c_address ) +{ + // do nothing. + // leave it in default state. +} + +PCA9548A::~PCA9548A() +{ + if ( NULL != i2c_p ) + delete i2c_p; +} + +void PCA9548A::select( char channel ) +{ + char data = 0x08 | channel; + + i2c.write( i2c_addr, &data, 1 ); +} + +void PCA9548A::disable( void ) +{ + char data = 0x00; + + i2c.write( i2c_addr, &data, 1 ); +}