Problem with erase and write flash in S12

[mojtaba_al22]

Hi guys,

I have a Bootloader and application files in project with part of S912G128MLL,now i cant erase and write flash with Bootloader.

 this is my app .prm file:

**************************************************************************************

NAMES END

HEXFILE bootloader.s19

SEGMENTS

      RAM           = READ_WRITE    0x2000 TO   0x37ff;

      DFLASH        = READ_WRITE   0x000400 TO 0x0013FF; 

      ROM_1400      = READ_ONLY     0x1400 TO   0x1FFF;

      ROM_4000      = READ_ONLY     0x4000 TO   0x7F7F;                 

      ROM_C000      = READ_ONLY     0xC000 TO   0xEFDF;

      PAGE_08       = READ_ONLY   0x088000 TO 0x08BFFF;

      PAGE_09       = READ_ONLY   0x098000 TO 0x09BFFF;

      PAGE_0A       = READ_ONLY   0x0A8000 TO 0x0ABFFF;

      PAGE_0B       = READ_ONLY   0x0B8000 TO 0x0BBFFF;

      PAGE_0C       = READ_ONLY   0x0C8000 TO 0x0C93FF;

      PAGE_0C_A000  = READ_ONLY   0x0CA000 TO 0x0CBFFF;

      PAGE_0E       = READ_ONLY   0x0E8000 TO 0x0EBFFF;   

END 

PLACEMENT

      _PRESTART,         

      STARTUP,              

      ROM_VAR,              

      STRINGS,            

      VIRTUAL_TABLE_SEGMENT,

      NON_BANKED,           

      COPY                                                                            

                        INTO  ROM_C000;                    

      DEFAULT_ROM       INTO  PAGE_08, PAGE_09, PAGE_0A, PAGE_0B, PAGE_0C, PAGE_0C_A000, PAGE_0E ;

      SSTACK,                

    DEFAULT_RAM         INTO  RAM;

END

ENTRIES 

END

STACKSIZE 0x100

*****************************************************************************

 this is my Bootloader  .prm file:

*****************************************************************************

INIT _BootStart

NAMES END

SEGMENTS          

      RAM           = READ_WRITE    0x3800 TO   0x3CFF;     

      RAM_CODE_SEG  = READ_ONLY     0xFD00 TO   0xFEFF RELOCATE_TO 0x3D00;     

      ROM_F000      = READ_ONLY     0xF000 TO   0xFCFF;

END

PLACEMENT

      ROM_VAR, 

      STRINGS, 

      DEFAULT_ROM,

      NON_BANKED      INTO  ROM_F000;

      DEFAULT_RAM     INTO  RAM;

      RAM_CODE        INTO  RAM_CODE_SEG;

END

ENTRIES

  flash_array

END

STACKSIZE 0x100

VECTOR 0 _BootStart

VECTOR 1 _BootStart

VECTOR 2 _BootStart

*************************************************************************************************************

and this is my erase code in bootloader :

************************************************************************************************************

UINT8 PFlash_EraseSector(UINT32 address)

{

  while((FSTAT & FSTAT_CCIF_MASK) == 0); 

  FSTAT = 0x30;   

  FCCOBIX = 0x00;

  FCCOB = 0x0A00 | ((address & 0x00080000)>>16);

  FCCOBIX = 0x01;

  FCCOB = (address & 0x0000FFF8);

  FSTAT = 0x80; 

  while((FSTAT & FSTAT_CCIF_MASK) == 0);

  if((FSTAT & (FSTAT_ACCERR_MASK | FSTAT_FPVIOL_MASK)) != 0)

   return FlashEraseError;

  else

   return noErr;

}

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

UINT8 PFlash_EraseSectorBySector(UINT32 addr_l, UINT32 addr_h)  // addr_l=0x088000 , addr_h=0x08EFDF

{

  UINT32 Address;

  UINT8 Error;   

  for(Address = addr_l; Address < addr_h; Address += FLASH_SECTOR_SIZE)  // FLASH_SECTOR_SIZE=200

  {

    Error = PFlash_EraseSector(Address);

    if(Error != noErr)

      return(Error);

  }

   return(noErr);

}

here is main code location

.

.

.

Please tell me where is my wrong

TNX

[kef2]

Hi,

I don't see how do you make code executing from RAM while flash is being erased/programmed. The problem is flash is not readable while it is being erased/programmed (as well not readable while backdoor access key is being verified, etc), but CPU has to read instructions somehow... So you need to move code execution to RAM/EEPROM/another flash bank at least for execution of these two lines:

FSTAT = 0x80;  // launch flash command

  while((FSTAT & FSTAT_CCIF_MASK) == 0); // wait until done

As well you need to a) disable interrupts or b) move interrupt vectors table and all interrupt service routines to RAM or other storage which is readable while flash commands are in progress.

Edward

[mojtaba_al22]

hi Edward

It's a little dumb for me.

If possible please explain by example or explain more.

Thank you for your post. 

mojtaba.

[kef2]

Please be more specific what is not clear for you. How to move code to RAM? Simple:

in *.prm file add placement for code in RAM:

PLACEMENT /* here all predefined and user segments are placed into the SEGMENTS defined above. */
      RAMCODE INTO RAM;

   ...

END

Fix you erase and program routines like this:

#pragma CODE_SEG __NEAR_SEG RAMCODE
void DoFlashCmd(void) {

  //DisableInterrupts;
  FSTAT = 0x80;

  while((FSTAT & FSTAT_CCIF_MASK) == 0); 

  //EnableInterrupts;
}
#pragma CODE_SEG DEFAULT

UINT8 PFlash_EraseSector(UINT32 address)

{
  while((FSTAT & FSTAT_CCIF_MASK) == 0);

  FSTAT = 0x30;  

  FCCOBIX = 0x00;

  FCCOB = 0x0A00 | ((address & 0x00080000)>>16);

  FCCOBIX = 0x01;

  FCCOB = (address & 0x0000FFF8);

  DoFlashCmd();

  if((FSTAT & (FSTAT_ACCERR_MASK | FSTAT_FPVIOL_MASK)) != 0)

   return FlashEraseError;

  else

   return noErr;
}

[mojtaba_al22]

Thanks for your reply .I'll check it

Best Regards,

Mojtaba