Revision 0:27125e4cf941, committed 2013-09-21

Comitter:

viswesr

Date:

Sat Sep 21 05:28:44 2013 +0000

Commit message:

PCA9672 Library (I2C IO Expander Interface) : First version

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCA9672.cpp	Sat Sep 21 05:28:44 2013 +0000
@@ -0,0 +1,54 @@
+/* mbed PCA9672 I2C I/O Expander Library
+ * Copyright (c) 2013 viswesr
+ *
+ * MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "PCA9672.h"
+
+PCA9672::PCA9672(PinName sda, PinName scl) : _i2c(sda, scl)
+{
+    // Software Reset
+    _i2c.start();
+    while(_i2c.write(0x00) !=1);
+    while(_i2c.write(0x06) !=1);
+    _i2c.stop();
+
+    /* Software reset is not required. But, gives an 
+       indication if the selected I2C bus frequency works */
+}
+
+void PCA9672::frequency(int hz)
+{
+    _i2c.frequency(hz);
+}
+
+void PCA9672::write(char value)
+{
+    _i2c.write(PCA9672_ADDR, &value, 1);
+}
+
+int PCA9672::read(void)
+{
+    _i2c.read(PCA9672_ADDR | 0x01);
+}
+
+PCA9672::~PCA9672()
+{
+
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCA9672.h	Sat Sep 21 05:28:44 2013 +0000
@@ -0,0 +1,69 @@
+/* mbed PCA9672 I2C I/O Expander Library
+ * Copyright (c) 2013 viswesr
+ *
+ * MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
+ * and associated documentation files (the "Software"), to deal in the Software without restriction, 
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or 
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+ 
+#ifndef PCA9672_H
+#define PCA9672_H
+ 
+#include "mbed.h"
+ 
+//  PCA9672 IIC slave address
+#define  PCA9672_ADDR 0x46
+ 
+
+//!Library for the PCA9672 I/O expander.
+/*!
+The PCA9672 is an I2C I/O expander. It has 8 I/O pins.
+*/
+class PCA9672
+{
+public:
+  /*!
+  Connect PCA9672 to I2C port pins sda and scl.
+  */
+  PCA9672(PinName sda, PinName scl);
+  
+  /*!
+  Set the frequency of the I2C interface.
+  */
+  void frequency(int hz);
+
+  /*!
+  Write the value to the IO Expander (pins XP0-XP7 output)
+  */
+  void write(char value);
+  
+  /*!
+  Read the value of the IO Expander (pins XP0-XP7 input)
+  */
+  int read(void);
+    
+  /*!
+  Destroys instance.
+  */ 
+  ~PCA9672();
+  
+private:
+  
+  I2C _i2c;
+ 
+};
+ 
+#endif
\ No newline at end of file