I want to use 4096 bytes of EEPROM for one purpose, as well as 32768 bytes of DFLASH

dastek · ‎07-29-2016

I am using the MC9s12xeq384 micro.

I am using the Cosmic compiler.

I want to use 4096 bytes of EEPROM for one purpose, as well as

32768 bytes of DFLASH for another purpose.

I purely need this memory for non-volatile storage and I use the EEPROM for its small sector erase size.

I previously had the DFLASH programming with no EEPROM working.

The code below gets the EEPROM into the memory map but the DFLASH does not program data now.

//*******************************

// set value of DFPART and ERPART

#define DFPART__ 0

#define ERPART__ 16

// {0,16} means that whole Buffer RAM and whole D-Flash is used for Emulated EEPROM

//*******************************

#define OK 0

#define ERROR 1

#define EEPROM_EMULATION_QUERY (unsigned char) 0x15 // - EEPROM

//==============================================================================

// EEE_Enable

//==============================================================================

void EEE_Enable(void)

{

while ((FSTAT & CCIF) == 0) ; // wait if command in progress

FSTAT = 0x30; // clear ACCERR and PVIOL

FCCOBIX = 0x00;

FCCOB = 0x1300; // ENABLE_EEPROM enable EEPROM Emulation Command

FSTAT = 0x80; // launch command

while ((FSTAT & CCIF) == 0) ; // wait for done

}

//==============================================================================

// DFLASH_Full_Partition

//==============================================================================

unsigned char DFLASH_Full_Partition(unsigned int set_DFPART, unsigned int set_ERPART)

{

while ((FSTAT & CCIF) == 0) ; // wait if command in progress

FSTAT = 0x30; // clear ACCERR and PVIOL

FCCOBIX = 0x00;

FCCOB = 0x0F00; // Full Partition D-Flash Command

FCCOBIX = 0x01;

FCCOB = set_DFPART; // DFPART = No of 256 byte sectors for DFlash == 32786

FCCOBIX = 0x02;

FCCOB = set_ERPART; // ERPART = No of 256 byte sectors in buffer RAM == 4096

FSTAT = 0x80; // launch command

while ((FSTAT & CCIF) == 0) ; // wait for done

if ((FSTAT & ACCERR) == 0) // Check if an error occured

return OK;

else

return ERROR;

}

@far

void Set_EEPROM_Status (void) // Emulation query - page 884

{

UINT8 err;

@far @gpage UINT16 DF @0x120000; // Address of DFPART

@far @gpage UINT16 ER @0x120004; // Address of ERPART

if ((*&DF != DFPART__) || // Check if these DWORDS are correct value

(*&ER != ERPART__))

{

if ((*&DF == 0xFFFF) && // Check if this is in erased state

(*&ER == 0xFFFF))

err = DFLASH_Full_Partition(DFPART__,ERPART__); //first startup of MCU - set the partition

}

EEE_Enable(); // Make the EEPROM visible in map

// ----------------- EEPROM Emulation Query Needs to be done after Setup or returns constants

FCCOBIX = 0x00; // Start command index

FCCOB = EEPROM_EMULATION_QUERY << 8; // EEPROM emulation query

FSTAT = 0x80; // launch command

while((FSTAT & CCIF) == 0) ; // wait for done

FCCOBIX = 0x01;

DFPART = FCCOB; // Read DFPART = 0 = No of 256 byte sectors in DFlash

FCCOBIX = 0x02;

ERPART = FCCOB; // Read ERPART = 16 = No of 256 byte sectors in buffer RAM

FCCOBIX = 0x03;

ECOUNT = FCCOB; // Read ECOUNT = 0

FCCOBIX = 0x04;

SEC_COUNT = FCCOB; // Read Dead SECtor COUNT = 4

FSTAT = 0x30; // clear ACCERR and FPVIOL

}

RadekS · ‎08-01-2016

Hi Wade,

I am afraid that it is not possible.

The EEPROM at S12XE is emulated, therefore we typically use term EEE or EEEPROM.

The emulated EEPROM at S12XE consist from RAM, non-volatile storage (= D-Flash) and hardware state machine which manages updates of D-Flash in the background.

By the (Full) Partitioning command you may set how big part from D-Flash will be used for emulated EEPROM. The extreme configuration are:

ERPART=16, DFPART=0 where whole D-Flash is used for emulating 4kB of EEEPROM.
ERPART=0, DFPART=128 where whole D-Flash is used as DATA flash with no EEEPROM. The appropriate buffer RAM could be used as standard RAM.

See, attached table with examples of ERPART/DFPART configurations.

Idea: You may emulate EEPROM by software on P-Flash. However, currently, I do not see any advantage in compare with the solution where we use whole D-Flash for EEE and save data into P-Flash. The simplest solution is partitioning just part of D-Flash for EEE. For example:

ERPART=8, DFPART=64 where 16kB D-Flash is used for emulating 2kB of EEEPROM and the next 16kB could be used as D-Flash.

Anyway, the software for emulating of EEPROM is described in AN4483 Emulated EEPROM Routines for the S12P Family

http://www.nxp.com/files/microcontrollers/doc/app_note/AN4483.pdf

http://www.nxp.com/files/microcontrollers/doc/app_note/AN4483SW.zip

and in AN2302 EEPROM Emulation for the MC9S12C32

http://www.nxp.com/files/microcontrollers/doc/app_note/AN2302.pdf

https://www.nxp.com/webapp/Download?colCode=AN2302SW

with AN3961 EEPROM Emulation for the MC9S12XS and MC9S12P Families Using AN2302 as a Reference

http://www.nxp.com/files/microcontrollers/doc/app_note/AN3961.pdf

http://www.nxp.com/files/microcontrollers/doc/app_note/AN3961SW.zip

You could use also EEPROM Emulation Driver for Flash in S12XS, S12P, S12HY and S12XHY:

http://www.nxp.com/files/microcontrollers/software/device_drivers/S12XS_P_HY_XHY_EEE.exe

and Standard Software Driver (SSD) for Flash in S12XS, S12P, S12HY and S12XHY:

http://www.nxp.com/files/microcontrollers/software/device_drivers/S12XS_P_HY_XHY_SSD.exe

Additionally, the PE EEE S12XE driver could be also configured for software emulation at P-Flash. However, I don’t have experience with that solution.

I hope it helps you.

Have a great day,
Radek

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EDIT: I forgot on attachment.

I want to use 4096 bytes of EEPROM for one purpose, as well as 32768 bytes of DFLASH

I want to use 4096 bytes of EEPROM for one purpose, as well as 32768 bytes of DFLASH

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