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Software Reset with Alternate Start on XC164

Paul Shipley

Greetings,

Does anyone know if it is possible to initiate an alternate start after a software reset on the Infineon XC164?

My problem is I have 2 pieces of software programmed into the ROM of the XC164, one lives in 0xC00000 to 0xC0FFFF, and the other lives in 0xC10000 to 0xC1FFFF. I can select which program runs using the /ALE switch and doing a hardware reset on my dev board, but I want to have one program relinquish control to the other through a software reset.

There may be a clue in the VECSEG register, but nothing I have tried so far has worked. I was thinking along the lines of:

void reset_to_prog_a( void )
{
    VECSEG = 0xC0;
    _trap_(0);
}

void reset_to_prog_b( void )
{
    VECSEG = 0xC1;
    _trap_(0);
}

Any ideas? Is this even possible?

Many thanks,
Paul.

  • 0

    How about writing a magic number to a specific location and doing a conditional jump to the alternate program address? Basically, dealing with the problem in software, rather than in hardware.

    - mike

  • 0 in reply to Mik Kleshov

    Thanks for your reply Mike.

    I have implemented something along the lines of what you have suggested. Although it works, it isn't ideal, since the initial value of this specific location is not known after a power on reset.

    I have heard whispers from Infineon that it may be possible somehow - apparently their internal bootcode works along similar lines. So for now I'll continue to badger them about it!

    Paul.