Tedd OKANO / PCA9546A

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.

Dependents:   PCA9546A_Hello

PCA9546A.cpp@0:2d50d8bba33e, 2015-02-23 (annotated)

Committer:
okano
Date:
Mon Feb 23 06:07:04 2015 +0000
Revision:
0:2d50d8bba33e
initial version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okano 0:2d50d8bba33e 1 /**
okano 0:2d50d8bba33e 2 * PCA9546A library
okano 0:2d50d8bba33e 3 *
okano 0:2d50d8bba33e 4 * @author Tedd OKANO
okano 0:2d50d8bba33e 5 * @version 0.1
okano 0:2d50d8bba33e 6 * @date Feb-2015
okano 0:2d50d8bba33e 7 *
okano 0:2d50d8bba33e 8 * PCA9546A: an I2C bus switch control library
okano 0:2d50d8bba33e 9 *
okano 0:2d50d8bba33e 10 * The PCA9546A is a quad bidirectional translating switch controlled
okano 0:2d50d8bba33e 11 * via the I2C-bus. The SCL/SDA upstream pair fans out to four downstream
okano 0:2d50d8bba33e 12 * pairs, or channels. Any individual SCx/SDx channel or combination of
okano 0:2d50d8bba33e 13 * channels can be selected, determined by the contents of the programmable
okano 0:2d50d8bba33e 14 * control register.
okano 0:2d50d8bba33e 15 *
okano 0:2d50d8bba33e 16 * For more information about PCA9546A:
okano 0:2d50d8bba33e 17 * http://www.nxp.com/documents/data_sheet/PCA9546A.pdf
okano 0:2d50d8bba33e 18 *
okano 0:2d50d8bba33e 19 */
okano 0:2d50d8bba33e 20
okano 0:2d50d8bba33e 21 #include "PCA9546A.h"
okano 0:2d50d8bba33e 22
okano 0:2d50d8bba33e 23 PCA9546A::PCA9546A( PinName sda, PinName scl, char i2c_address )
okano 0:2d50d8bba33e 24 : i2c_p( new I2C( sda, scl ) ), i2c( *i2c_p ), i2c_addr( i2c_address ), enable_pattern( 0x00 )
okano 0:2d50d8bba33e 25 {
okano 0:2d50d8bba33e 26 // do nothing.
okano 0:2d50d8bba33e 27 // leave it in default state.
okano 0:2d50d8bba33e 28 }
okano 0:2d50d8bba33e 29
okano 0:2d50d8bba33e 30 PCA9546A::PCA9546A( I2C &i2c_, char i2c_address )
okano 0:2d50d8bba33e 31 : i2c_p( NULL ), i2c( i2c_ ), i2c_addr( i2c_address ), enable_pattern( 0x00 )
okano 0:2d50d8bba33e 32 {
okano 0:2d50d8bba33e 33 // do nothing.
okano 0:2d50d8bba33e 34 // leave it in default state.
okano 0:2d50d8bba33e 35 }
okano 0:2d50d8bba33e 36
okano 0:2d50d8bba33e 37 PCA9546A::~PCA9546A()
okano 0:2d50d8bba33e 38 {
okano 0:2d50d8bba33e 39 if ( NULL != i2c_p )
okano 0:2d50d8bba33e 40 delete i2c_p;
okano 0:2d50d8bba33e 41 }
okano 0:2d50d8bba33e 42
okano 0:2d50d8bba33e 43 void PCA9546A::on( char channel )
okano 0:2d50d8bba33e 44 {
okano 0:2d50d8bba33e 45 enable_pattern |= 0x1 << channel;
okano 0:2d50d8bba33e 46
okano 0:2d50d8bba33e 47 bitpattern( enable_pattern );
okano 0:2d50d8bba33e 48 }
okano 0:2d50d8bba33e 49
okano 0:2d50d8bba33e 50 void PCA9546A::off( char channel )
okano 0:2d50d8bba33e 51 {
okano 0:2d50d8bba33e 52 enable_pattern &= ~(0x1 << channel);
okano 0:2d50d8bba33e 53
okano 0:2d50d8bba33e 54 bitpattern( enable_pattern );
okano 0:2d50d8bba33e 55 }
okano 0:2d50d8bba33e 56
okano 0:2d50d8bba33e 57 void PCA9546A::bitpattern( char pattern )
okano 0:2d50d8bba33e 58 {
okano 0:2d50d8bba33e 59 i2c.write( i2c_addr, &pattern, 1 );
okano 0:2d50d8bba33e 60 }