Component library for PCA9546A. The PCA9546A is a quad bidirectional translating switch controlled via the I2C-bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register.
PCA9546A.cpp
- Committer:
- okano
- Date:
- 2015-02-23
- Revision:
- 0:2d50d8bba33e
File content as of revision 0:2d50d8bba33e:
/** * PCA9546A library * * @author Tedd OKANO * @version 0.1 * @date Feb-2015 * * PCA9546A: an I2C bus switch control library * * The PCA9546A is a quad bidirectional translating switch controlled * via the I2C-bus. The SCL/SDA upstream pair fans out to four downstream * pairs, or channels. Any individual SCx/SDx channel or combination of * channels can be selected, determined by the contents of the programmable * control register. * * For more information about PCA9546A: * http://www.nxp.com/documents/data_sheet/PCA9546A.pdf * */ #include "PCA9546A.h" PCA9546A::PCA9546A( PinName sda, PinName scl, char i2c_address ) : i2c_p( new I2C( sda, scl ) ), i2c( *i2c_p ), i2c_addr( i2c_address ), enable_pattern( 0x00 ) { // do nothing. // leave it in default state. } PCA9546A::PCA9546A( I2C &i2c_, char i2c_address ) : i2c_p( NULL ), i2c( i2c_ ), i2c_addr( i2c_address ), enable_pattern( 0x00 ) { // do nothing. // leave it in default state. } PCA9546A::~PCA9546A() { if ( NULL != i2c_p ) delete i2c_p; } void PCA9546A::on( char channel ) { enable_pattern |= 0x1 << channel; bitpattern( enable_pattern ); } void PCA9546A::off( char channel ) { enable_pattern &= ~(0x1 << channel); bitpattern( enable_pattern ); } void PCA9546A::bitpattern( char pattern ) { i2c.write( i2c_addr, &pattern, 1 ); }