//----------------------------------------------------------------------------

//Eeprom support module

//----------------------------------------------------------------------------

#include <Main.h>
#include <Eeprom.h>

//------------------------------ Constants: ----------------------------------

#define RBUFF 100 //EEPROM ring buffer size
#define RSIG 0xDA //record header signature

//------------------------------ Variables: ----------------------------------

typedef struct
{
char Sig; //record header signature
bool On; //On flag
int Val; //stored value
} EVal;

__no_init __eeprom int EData[EE_N]; //EEPROM data array
__no_init __eeprom EVal EVals[RBUFF]; //EEPROM ring buffer

static char EePnt = 0; //pointer to currently used record

//-------------------------- Read EEPROM data: -------------------------------

int Eeprom_Read(char a)
{
return(EData[a]); //read parameter
}

//-------------------------- Write EEPROM data: -------------------------------

void Eeprom_Write(char a, int d)
{
if(EData[a] != d) //if parameter changed
{
EData[a] = d; //write parameter
__watchdog_reset(); //watchdog reset
}
}

//-------------------------- Read V from EEPROM: -----------------------------

int Eeprom_ReadV(bool *on)
{
EePnt = RBUFF; //set incorrect pointer value
for(char i = 0; i < RBUFF; i++) //search signature in ring buffer
if(EVals[i].Sig == RSIG) //if signature found
{
EePnt = i; //initialize pointer
break;
}
if(EePnt == RBUFF) //if pointer incorrect (signature not found)
{
EePnt = 0; //set pointer to first array record
*on = 0; //supply off
return(0); //return V = 0
}
*on = EVals[EePnt].On; //read on flag
return(EVals[EePnt].Val); //read V
}

//--------------------------- Write V to EEPROM: -----------------------------

void Eeprom_WriteV(int v, bool on)
{
char NewPnt = EePnt; //save previous pointer value
if(NewPnt++ == RBUFF) //advance pointer
NewPnt = 0; //roll-up pointer
EVals[NewPnt].On = on; //save on flag
EVals[NewPnt].Val = v; //save V
EVals[NewPnt].Sig = RSIG; //save signature at new location
EVals[EePnt].Sig = 0xFF; //clear signature at old location
__watchdog_reset(); //watchdog reset
EePnt = NewPnt; //save new pointer value
}

//----------------------------------------------------------------------------