Diff: PCA9546A.cpp

Revision:

0:2d50d8bba33e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCA9546A.cpp	Mon Feb 23 06:07:04 2015 +0000
@@ -0,0 +1,60 @@
+/**
+ *  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 );
+}