src/Eeprom.h

   1 #ifndef AVR_EEPROM_H
   2 #define AVR_EEPROM_H
   3
   4 #include "Memory.h"
   5 #include "Hardware.h"
   6
   7 namespace avr {
   8
   9         /**
  10          * @author Tom Haber
  11          * @date Apr 21, 2008
  12          * @brief Electrically Erasable Programmable Read-Only Memory
  13          *
  14          * This class represents the Eeprom memory in the chip.
  15          */
  16         class Eeprom : public Hardware, public Memory {
  17                 public:
  18                         Eeprom(Bus & bus, unsigned int size, unsigned int rdyVec);
  19                         ~Eeprom();
  20
  21                 public:
  22                         void writeToAddress(unsigned int addr, unsigned char val);
  23                         unsigned char readFromAddress(unsigned int addr);
  24
  25                 public:
  26                         bool attachReg(const char *name, IORegister *reg);
  27                         void regChanged( IORegister *reg );
  28                         void step();
  29
  30                 private:
  31                         void setEECR( unsigned char eecr );
  32
  33                 private:
  34                         unsigned int eear;
  35                         unsigned int rdyVec;
  36                         unsigned char oldEecr;
  37
  38                         enum {
  39                                 READY,
  40                                 READ,
  41                                 WRITE,
  42                                 WRITE_ENABLED
  43                         } state;
  44
  45                         static const unsigned int writeEnableCycles = 4;
  46                         static const unsigned int readCycles = 4;
  47                         static const unsigned int writeCycles = 2;
  48
  49                 private:
  50                         IORegister *eearl;
  51                         IORegister *eearh;
  52                         IORegister *eecr;
  53                         IORegister *eedr;
  54         };
  55
  56 }
  57
  58 #endif /*AVR_EEPROM_H*/