Newbie question: Initialisation of internal SRAM

Prao — Tue, 05 May 2009 13:57:55 GMT

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.

Re: Newbie question: Initialisation of internal SRAM

Prao — Tue, 05 May 2009 14:35:26 GMT

Oh! I just realised the the startup code in startcf.c clears all memory! Does this mean that the RAM need not be cleared to zeroes explicitly?

Regards.

topic Newbie question: Initialisation of internal SRAM in ColdFire/68K Microcontrollers and Processors

Newbie question: Initialisation of internal SRAM

Re: Newbie question: Initialisation of internal SRAM