Diff: PCA9547.h

Revision:

0:2d777d5d7e6b

Child:

1:c388983364cc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCA9547.h	Fri Oct 02 05:37:18 2015 +0000
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+/**
+ *  PCA9547 library
+ *      +++++ Based on; https://developer.mbed.org/users/okano/code/PCA9547/ +++++
+ *
+ *  @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
+ *
+ */
+#pragma once
+
+// if You Need Reset, 
+//#define PCA9547_RESET p26
+
+#include "mbed.h"
+
+/** PCA9547 class
+ *
+ *  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 informatioj about PCA9547:
+ *    http://www.nxp.com/documents/data_sheet/PCA9547.pdf
+ *
+ *  Example:
+ *  @code
+ *  #include "mbed.h"
+ *  #include "LM75B.h"
+ *  #include "PCA9547.h"
+ *
+ *  PCA9547 mux( p28, p27, 0xE0 );
+ *
+ *  int main()
+ *  {
+ *      mux.select( 0 );
+ *
+ *      LM75B   tmp0( p28, p27 );   //  making instance after a branch of I2C bus (which is connecting the LM75B) enabled
+ *
+ *      while(1) {
+ *          printf( "%.3f\r\n", tmp0.read() );
+ *          wait( 1.0 );
+ *      }
+ *  }
+ *  @endcode
+ */
+
+class PCA9547
+{
+public:
+
+    /** Create a PCA9547 instance connected to specified I2C pins with specified address
+     *
+     * @param sda I2C-bus SDA pin
+     * @param scl I2C-bus SCL pin
+     * @param i2c_address I2C-bus address (default: 0xE0)
+     */
+    PCA9547( PinName sda, PinName scl, char i2c_address = 0xE0 );
+
+    /** Create a PCA9546A instance connected to specified I2C pins with specified address
+     *
+     * @param &i2c_ I2C object (instance)
+     * @param i2c_address I2C-bus address (default: 0xE0)
+     */
+    PCA9547( I2C &i2c_, char i2c_address = 0xE0 );
+
+    /** Destructor of PCA9547
+     */
+    ~PCA9547();
+
+    /** Channel select
+     *
+     *  Enable and select a channel
+     *
+     * @param channel channel number (integer). Not ASCII.
+     */
+     bool select(int ch);
+//    void select( char channel );
+    
+
+    /** Disabling all channels
+     *
+     *  Disable all channels
+     */
+    void disable( void );
+
+private:
+    I2C     *i2c_p;
+    I2C     &i2c;
+    char    i2c_addr;
+#ifdef PCA9547_RESET
+    DigitalOut resetPin(PCA9547_RESET);
+#endif
+    
+    void init();
+};
+
+// EOF
\ No newline at end of file