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eeprom.c
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eeprom.c
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#include "./DevelOS.h"
#ifdef MOD_FlashFS
// <editor-fold defaultstate="collapsed" desc="void EE_format(void)">
void EE_format(void)
{
unsigned char i;
// First, Overwrite all with Free sig
for(i=0;i<EE_Blocksize;i++)
{
Flash.Data[i]=EE_sig_Free;
}
// now, write this empty but valid block to all blocks
for(i=0;i<EE_Blocks;i++)
{
EE_save_block(i);
//EE_write_block(Flash.eprom.Block[i].adress, &temp, EE_Blocksize);
}
// Now, prepare FlashFS Data
for(i=0;i<EE_Blocksize;i++)
{
Flash.Data[i]=0;
}
// TODO: generalize, these are for testing
Flash.Data[0] = EE_Blocks; // we have 16*64=1024 bytes on a 18F 46K20
Flash.Data[1] = 0; // have 2 external eeproms on i2c
Flash.Data[2] = 0xB0; // Atmel 32 kbit
Flash.Data[3] = 0xA8; // ST 8 kbit
Flash.Data[FFS_signature] = EE_sig_FlashFS;
// Write FlashFS Data
EE_save_block(0);
//EE_write_block(Flash.eprom.Block[0].adress, &temp, EE_Blocksize);
// Finally, write OS Data
SaveEEPROM_OS(1);
}// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="char EE_load_block(unsigned char block)">
char EE_load_block(unsigned char block)
{
unsigned char len = EE_Blocksize;
unsigned char *ram_start_address = &Flash.Data;
unsigned int eeprom_start_address = Flash.eprom.Block[block].adress;
unsigned char result;
unsigned int crc, crc_l;
result = EE_read_block(eeprom_start_address, ram_start_address, len);
crc = crc16(&Flash.Data, EE_Blocksize-4);
crc_l = 0;
crc_l |= ((unsigned char) Flash.Data[FFS_Data_CRC]) << 8;
crc_l |= ((unsigned char) Flash.Data[FFS_Data_CRC+1]);
if(crc != crc_l)
{
// block invalid
return -1;
}
else
{
return 0;
}
}// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="char EE_save_block(unsigned char block)">
char EE_save_block(unsigned char block)
{
unsigned char len = EE_Blocksize;
unsigned char *ram_start_address = &Flash.Data;
unsigned int eeprom_start_address = Flash.eprom.Block[block].adress;
char result;
unsigned int crc;
crc = crc16(&Flash.Data, EE_Blocksize-4);
Flash.Data[FFS_Data_CRC] = (unsigned char)( (crc >> 8) & 0xFF);
Flash.Data[FFS_Data_CRC+1] = (unsigned char)( crc & 0xFF);
result = EE_write_block(eeprom_start_address, ram_start_address, len);
return result;
}// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="unsigned char EE_read_block(unsigned int eeprom_start_address, unsigned char *ram_start_address, unsigned char len)">
unsigned char EE_read_block(unsigned int eeprom_start_address, unsigned char *ram_start_address, unsigned char len)
{
unsigned char count;
unsigned char *ram_start_address_copy;
ram_start_address_copy = ram_start_address;
//Write the address to eeadr
EEADR = (eeprom_start_address & 0x00ff); //(n.b. silicon bug for some devices - don't do directly before setting eecon1,rd)
#ifdef EE_1k
EEADRH = (eeprom_start_address >> 8);
#endif
//Set control bits
EECON1bits.EEPGD = 0; //Point to eeprom not program flash memory
EECON1bits.CFGS = 0; //Access eeprom registers, not configuration registers
//Get the data from eeprom
for (count = 0; count < len; count++)
{
EECON1bits.RD = 1;
Nop();
*ram_start_address++ = EEDATA;
EEADR++; //(n.b. silicon bug - don't do directly before setting eecon1,rd)
#ifdef EE_1k
if (EEADR == 0)
EEADRH++;
#endif
}
//Exit if not doing checksum bytes
return 1;
}// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="unsigned char EE_read_byte(unsigned int eeprom_address)">
unsigned char EE_read_byte(unsigned int eeprom_address)
{
unsigned char byte;
byte = 0;
//Write the address to eeadr
EEADR = (eeprom_address & 0x00ff); //(n.b. silicon bug for some devices - don't do directly before setting eecon1,rd)
#ifdef EE_1k
EEADRH = (eeprom_address >> 8);
#endif
//Set control bits
EECON1bits.EEPGD = 0; //Point to eeprom not program flash memory
EECON1bits.CFGS = 0; //Access eeprom registers, not configuration registers
//Get the data from eeprom
EECON1bits.RD = 1;
Nop();
byte = EEDATA;
return byte;
}// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="unsigned char EE_write_block(unsigned int eeprom_start_address, unsigned char *ram_start_address, unsigned char len)">
unsigned char EE_write_block(unsigned int eeprom_start_address, unsigned char *ram_start_address, unsigned char len)
{
unsigned char count,flag;
flag=0;
//Write the address to eeadr
EEADR = (eeprom_start_address & 0x00ff); //(n.b. silicon bug - don't do directly before setting eecon1,rd)
#ifdef EE_1k
EEADRH = (eeprom_start_address >> 8);
#endif
//Set control bits
EECON1bits.EEPGD = 0; //Point to eeprom not program flash memory
EECON1bits.CFGS = 0; //Access eeprom registers, not configuration registers
EECON1bits.WREN = 1; //Enable eeprom writes
// save interrupt state
if(INTCONbits.GIEH)
{
flag=2;
}
if(INTCONbits.GIEL)
{
flag++;
}
//disable interrupt
INTCONbits.GIEL=0;
INTCONbits.GIEH=0;
PIR2bits.EEIF = 0; //Clear write complete flag
//Write the data to eeprom
for (count = 0; count < len; count++)
{
EEDATA = *ram_start_address++;
EECON2 = 0x55; //Do the write enable sequence
EECON2 = 0xaa;
EECON1bits.WR = 1; //Start write
while( EECON1bits.WR ); //Wait for write to complete
PIR2bits.EEIF = 0; //Clear write complete flag
EEADR++; //Increment address
#ifdef EE_1k
if (EEADR == 0)
EEADRH++;
#endif
}
//restore injterrupt states
if(flag>=2)
{
INTCONbits.GIEH=1;
flag -=2;
}
if(flag>0)
{
INTCONbits.GIEL=1;
}
return 0;
}// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="TODO: check_block">
/*unsigned char EE_check_block(unsigned int eeprom_start_address, unsigned char len)
{
unsigned int check;
unsigned char count;
//Write the address to eeadr
EEADR = (eeprom_start_address & 0x00ff); //(n.b. silicon bug for some devices - don't do directly before setting eecon1,rd)
#ifdef EE_1k
EEADRH = (eeprom_start_address >> 8);
#endif
check = (unsigned int) 1;
//Set control bits
EECON1bits.EEPGD = 0; //Point to eeprom not program flash memory
EECON1bits.CFGS = 0; //Access eeprom registers, not configuration registers
//Get the data from eeprom
for (count = 0; count < len; count++)
{
EECON1bits.RD = 1;
Nop();
check += EEDATA;
EEADR++; //(n.b. silicon bug - don't do directly before setting eecon1,rd)
#ifdef EE_1k
if (EEADR == 0)
EEADRH++;
#endif
}
//----- DO THE CHECKSUM -----
//Get and check checksum h
EECON1bits.RD = 1;
Nop();
if (EEDATA != (unsigned char) (check >> 8))
goto read_pic_eeprom_fail;
//Get and check checksum l
EEADR++; //(n.b. silicon bug - don't do directly before setting eecon1,rd)
#ifdef EE_1k
if (EEADR == 0)
EEADRH++;
#endif
EECON1bits.RD = 1;
Nop();
if (EEDATA != (unsigned char) (check & 0x00ff))
goto read_pic_eeprom_fail;
return 1; //Checksum good
read_pic_eeprom_fail:
//----- BAD CHECKSUM -----
return 0;
}*/
// </editor-fold> // TODO: durch sinnvolle check-funktion ersetzen
// <editor-fold defaultstate="collapsed" desc="void InitEEPROM(void)">
void InitEEPROM(void)
{
char i;
for(i=0;i<EE_Blocks;i++)
{
Flash.eprom.Block[i].adress=i*EE_Blocksize;
Flash.eprom.Block[i].signature=EE_read_byte(Flash.eprom.Block[i].adress + (EE_Blocksize-1) ) ;
}
}// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="unsigned char LoadEEPROM_OS(unsigned char block)">
char LoadEEPROM_OS(unsigned char block) // Read System Data from EEPROM
{
// unsigned char temp[EE_Blocksize];
// unsigned int crc, crc_l;
signed char err;
err = EE_load_block(block);
if(err != 0)
{
return err;
}
// EE_read_block(Flash.eprom.Block[block].adress, &temp[0], EE_Blocksize);
// crc = crc16(&temp, EE_Blocksize-4);
// crc_l = 0;
// crc_l |= ((unsigned char) temp[61]) << 8;
// crc_l |= ((unsigned char) temp[62]);
// if(crc != crc_l)
// {
// // block invalid
// return -1;
// }
else
{
//OS.prev_runlevel = temp[0];
//OS.runlevel = temp[1];
//OS.runmode = temp[2];
//OS.CPUClock = temp[3];
OS.Temp = Flash.Data[4];
OS.U12V = Flash.Data[5];
OS.U3V3 = Flash.Data[6];
OS.U5V0 = Flash.Data[7];
OS.Rcount += Flash.Data[8];
OS.RcountBOR += Flash.Data[9];
OS.RcountPOR += Flash.Data[10];
OS.RcountRI += Flash.Data[11];
OS.RcountWDT += Flash.Data[12];
OS.RcountSO += Flash.Data[13];
OS.RcountSU += Flash.Data[14];
#ifdef MOD_rtc
rtc.days = Flash.Data[15];
rtc.hour = Flash.Data[16];
rtc.mins = Flash.Data[17];
rtc.mont = Flash.Data[18];
rtc.secs = Flash.Data[19];
rtc.year = Flash.Data[20];
#endif
return 0; // block loaded
}
}// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="unsigned char SaveEEPROM_OS(unsigned char block)">
unsigned char SaveEEPROM_OS(unsigned char block) // Write System Data to EEPROM
{
// unsigned char temp[EE_Blocksize];
// unsigned int crc;
memset(Flash.Data, 0, EE_Blocksize );
Flash.Data[0] = OS.prev_runlevel;
Flash.Data[1] = OS.runlevel;
Flash.Data[2] = OS.runmode;
Flash.Data[3] = 0; // OS.CPUClock; is 4 bytes
Flash.Data[4] = OS.Temp;
Flash.Data[5] = OS.U12V;
Flash.Data[6] = OS.U3V3;
Flash.Data[7] = OS.U5V0;
Flash.Data[8] = OS.Rcount;
Flash.Data[9] = OS.RcountBOR;
Flash.Data[10] = OS.RcountPOR;
Flash.Data[11] = OS.RcountRI;
Flash.Data[12] = OS.RcountWDT;
Flash.Data[13] = OS.RcountSO;
Flash.Data[14] = OS.RcountSU;
#ifdef MOD_rtc
Flash.Data[15] = rtc.days;
Flash.Data[16] = rtc.hour;
Flash.Data[17] = rtc.mins;
Flash.Data[18] = rtc.mont;
Flash.Data[19] = rtc.secs;
Flash.Data[20] = rtc.year;
#endif
Flash.Data[63] = EE_sig_System;
EE_save_block(block);
//EE_write_block(Flash.eprom.Block[block].adress, &temp[0], EE_Blocksize);
}// </editor-fold>
#endif /* MOD_FlashFS */