option to pass I2C object

I2CEEBlockDevice.cpp

@@ -21,11 +21,26 @@
 I2CEEBlockDevice::I2CEEBlockDevice(
         PinName sda, PinName scl, uint8_t addr,
         bd_size_t size, bd_size_t block, int freq)
-    : _i2c(sda, scl), _i2c_addr(addr), _size(size), _block(block)
+    : _i2c_p(new I2C(sda, scl)), _i2c(*_i2c_p), _i2c_addr(addr),
+      _size(size), _block(block)
 {
     _i2c.frequency(freq);
 }
 
+I2CEEBlockDevice::I2CEEBlockDevice(
+        I2C &i2c_obj, uint8_t addr,
+        bd_size_t size, bd_size_t block)
+    : _i2c_p(NULL), _i2c(i2c_obj), _i2c_addr(addr),
+      _size(size), _block(block)
+{
+}
+I2CEEBlockDevice::~I2CEEBlockDevice()
+{
+    if (_i2c_p != NULL){
+        delete  _i2c_p;
+    }
+}
+
 int I2CEEBlockDevice::init()
 {
     return _sync();

I2CEEBlockDevice.h

@@ -70,7 +70,24 @@ public:
     I2CEEBlockDevice(
             PinName sda, PinName scl, uint8_t address,
             bd_size_t size, bd_size_t block=32,
-            int bus_speed=400000);
+            int bus_speed=400000);  
+
+     /** Constructor to create an I2CEEBlockDevice on I2C pins
+     *
+     *  @param i2c      The I2C instance
+     *  @param addr     The 8bit I2C address of the chip, common range 0xa0 - 0xae.
+     *  @param size     The size of the device in bytes
+     *  @param block    The page size of the device in bytes, defaults to 32bytes
+     *  @param freq     The frequency of the I2C bus, defaults to 400K.
+     */
+    I2CEEBlockDevice(
+            I2C &i2c_obj, uint8_t address,
+            bd_size_t size, bd_size_t block=32);
+
+    /** Destructor of I2CEEBlockDevice
+     */
+
+    virtual ~I2CEEBlockDevice();
 
     /** Initialize a block device
      *
@@ -141,7 +158,8 @@ public:
     virtual bd_size_t size() const;
     
 private:
-    I2C _i2c;
+    I2C *_i2c_p;
+    I2C &_i2c;
     uint8_t _i2c_addr;
     uint32_t _size;
     uint32_t _block;