Tedd OKANO / PCA9547

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

Dependents:   pca9547_Hello m3Dpi

/media/uploads/okano/pca9547_connections.png

Information

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The PCA9547 is an octal bidirectional translating multiplexer controlled by the I2C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels.

pca9547

PCA9547.cpp@0:662ab6a5aa97, 2014-07-01 (annotated)

Committer:
okano
Date:
Tue Jul 01 00:10:04 2014 +0000
Revision:
0:662ab6a5aa97
Child:
1:47f2cf4c6619
first library test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okano 0:662ab6a5aa97 1 #include "PCA9547.h"
okano 0:662ab6a5aa97 2
okano 0:662ab6a5aa97 3 PCA9547::PCA9547( PinName sda, PinName scl, char i2c_address ) : i2c( sda, scl ), _i2c_addr( i2c_address )
okano 0:662ab6a5aa97 4 {
okano 0:662ab6a5aa97 5 // do nothing.
okano 0:662ab6a5aa97 6 // leave it in default state.
okano 0:662ab6a5aa97 7 }
okano 0:662ab6a5aa97 8
okano 0:662ab6a5aa97 9 PCA9547::~PCA9547()
okano 0:662ab6a5aa97 10 {
okano 0:662ab6a5aa97 11
okano 0:662ab6a5aa97 12 }
okano 0:662ab6a5aa97 13
okano 0:662ab6a5aa97 14 void PCA9547::select( char channel )
okano 0:662ab6a5aa97 15 {
okano 0:662ab6a5aa97 16 char data = 0x08 | channel;
okano 0:662ab6a5aa97 17
okano 0:662ab6a5aa97 18 i2c.write( _i2c_addr, &data, 1);
okano 0:662ab6a5aa97 19 }