Diff: PCA9547.cpp

Revision:

0:5d6ed64426fb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCA9547.cpp	Fri Jan 11 08:00:39 2019 +0000
@@ -0,0 +1,52 @@
+/**
+ *  PCA9547 library
+ *
+ *  @author  Tedd OKANO
+ *  @version 0.2
+ *  @date    Feb-2015
+ *
+ *  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_p( new I2C( sda, scl ) ), i2c( *i2c_p ), i2c_addr( i2c_address )
+{
+    //  do nothing.
+    //  leave it in default state.
+}
+
+PCA9547::PCA9547( I2C &i2c_, char i2c_address )
+    : i2c_p( NULL ), i2c( i2c_ ), i2c_addr( i2c_address )
+{
+    //  do nothing.
+    //  leave it in default state.
+}
+
+PCA9547::~PCA9547()
+{
+    if ( NULL != i2c_p )
+        delete  i2c_p;
+}
+
+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 );
+}