PRAKRUTHI RAO

Newbie question: Initialisation of internal SRAM

Discussion created by PRAKRUTHI RAO on May 5, 2009
Latest reply on May 5, 2009 by PRAKRUTHI RAO

I'm using codewarrior for Coldfire architectures and Processor expert to help me program the MCF5225x. Using the initialisation procedure provided in the Reference Manual I wrote the following function to initialise the SRAM.

 

void Int_sram_initialise (void)
    {
        asm
            {
                lea.l RAMBAR, A0            //following loop initialises entire SRAM to zero
                move.l #16384, D0

            sram_init:
                     clr.l (A0)+
                     clr.l (A0)+
                     clr.l (A0)+
                     clr.l (A0)+
                     subq.l #4, D0
                     bne.b sram_init
               }
    }

 

The Cpu.c file has already initialised the RAM enable bit.

 

/* Initialize RAMBAR */
  asm {
    move.l  #0x20000221,d0
    movec   d0,RAMBAR
  }

 

What I would like to know is, if there is a way that the SRAM initialisation to zeroes can be done in C?  Is there a way that the address and data registers can be accessed using C.

 

TIA!

 

Regards,

Prao.

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