Flash MPC55xx

[joesmith]

    Hi Can Anyone give me some advice on how to program me the flash on mpc55xx, in C.

I have the following code

main()

{

  unsigned long* FlashRegister   ;

  FLASH.HLR.R = 0xB2B22222;

  FLASH.HLR.B.HBLOCK = 0b1;

  FLASH.HSR.B.HBSEL = 0b1;

  FlashRegister = ((unsigned long*)(0x80000));

  FLASH.MCR.B.PGM = 1;

  *(FlashRegister) = 5;

  FLASH.MCR.B.EHV = 1;

  while(FLASH.MCR.B.DONE == 0)

  {

  }

  FLASH.MCR.B.EHV = 0;

  FLASH.MCR.B.PGM = 0;

}

but when i try and read the address back it still says its 0xffffffff.

It properly something really stupid.

Cheers

Joe

[jonr]

You can go to:

mpc5xxx-engine-control - Develop engine control software for FreeScale MPC5xxx cpus - Google Projec...

for some working flash burning code.

[lukaszadrapa]

Probably too late but:

FLASH.HLR.B.HBLOCK = 0b1;

"1" means the flash block is locked

"0" means the block can be erase/programmed.

So, it should be changed to:

FLASH.HLR.B.HBLOCK = 0b0;     //unlock all high blocks

If you program the flash, it is not necessary to set the HSR register. This line can be deleted:

FLASH.HSR.B.HBSEL = 0b1;