I2C_base.h

00001 #ifndef I2C_BASE_H
00002 #define I2C_BASE_H
00003 
00004 #define _MBED_
00005 
00006 //Base class to extend I2C support to multiple platforms
00007 typedef char byte;
00008 
00009 
00010 class I2C_base
00011 {
00012  public:
00013     virtual void frequency (int frequency)                             = 0; //set the communication frequency
00014     virtual bool read      (int address, byte* data, int length)       = 0; //read data from the bus
00015     virtual bool write     (int address, const byte* data, int length) = 0; //write data to the bus  
00016     virtual bool writeByte (int address, byte data)                    = 0; //write byte to the bus
00017     
00018  private:
00019     int _frequency;
00020 };
00021 
00022 extern I2C_base* i2c;
00023 
00024 
00025  //MBED programming environmnet
00026 #ifdef _MBED_
00027 #include "mbed.h"
00028 //define SDA and SCL if not already defined
00029 #ifndef SDA
00030     #define SDA p28
00031 #endif
00032 
00033 #ifndef SCL
00034     #define SCL p27
00035 #endif
00036 //*******************************************
00037 
00038 
00039 /* should be placed somewhere else, just debug code*/
00040 
00041 
00042 
00043 int millis();
00044 
00045 /***************************************************/
00046  
00047 class I2C_MBED: public I2C_base
00048 {
00049  public:
00050     I2C_MBED (PinName pSDA, PinName pSCL): _i2c(pSDA,pSCL){}
00051     virtual void frequency (int hz)
00052     {
00053         _i2c.frequency(hz);
00054     } 
00055     virtual bool read(int address, byte* data, int length)
00056     {
00057         return !_i2c.read(address<<1,data,length);
00058     }
00059     virtual bool write(int address, const byte* data, int length)
00060     {
00061         return !_i2c.write(address<<1,data,length);
00062     }
00063     virtual bool writeByte(int address, byte data)
00064     {
00065         return write(address, &data, 1);
00066     }
00067 
00068  private:
00069     I2C _i2c;
00070 };
00071 
00072 
00073 
00074 #endif //_MBED_
00075 
00076 
00077 #endif //I2C_BASE_H