Adaptation for PCA9548 Nxp I2C switch
Fork of PCA9547 by
PCA9547.cpp
- Committer:
- okano
- Date:
- 2014-08-12
- Revision:
- 7:995f209b8707
- Parent:
- 4:3c0af4c37587
- Child:
- 8:c716fb3ccb8d
File content as of revision 7:995f209b8707:
/** * PCA9547 library * * @author Tedd OKANO * @version 0.1 * @date July-2014 * * 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( sda, scl ), _i2c_addr( i2c_address ) { // do nothing. // leave it in default state. // FOR TEST PURPOSE // THIS DEVICE USES DIFFERENT I2C FREQUENCY i2c.frequency( 400 * 1000 ); } PCA9547::~PCA9547() { } 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 ); }