absolute jump to application from bootloader

nordic56 — Tue, 10 Mar 2009 22:53:11 GMT

Hi,

I´m looking for a solution for my bootloader.

I´m using 56F8025 and CW_forDSC56800E V8.2

After downloading the firmware I want the program to jump to an absolute address.

The absolute address is the entry point of the application, stored in the downloaded relocated vector table.

Since I´m not familiar with assembler for dsc 56f800/E, is there any idea how to manage this absolute jump for the dsc56F800 family?

thanks in advance.

Re: absolute jump to application from bootloader

FTSolutions — Sat, 11 Apr 2009 03:24:32 GMT

I am not as familiar with the 56f8025, but on the 56f8367 and 56f8357s I use, the codewarrior PE tool will store the user's starting address in the top 32bits of dataflash memory - if you have the PE license it does this automatically if you check "Bootloader support = Yes" in the processor expert. IF you don't have PE license, you could do the similar thing with your app code with the address of main(). You must loadthe 32-bit address value into an unsigned long "StartAddress".

The bootloader then just does the following (in the '357 and '367 anyhow):

#define USER_INTERRUPT_VECTOR_ADDRESS (0x00000000UL)

#define INTC_VBA *((volatile word *)0x0000F1AA)

/****************************************************************************
/ change base address of the interrupt vector table for user's application
/****************************************************************************/
   setReg(INTC_VBA, USER_INTERRUPT_VECTOR_ADDRESS >> 8);
   asm(nop);
   asm(nop);
/****************************************************************************
/ call user's application
/****************************************************************************/
   asm(move.l StartAddress, N);
   asm(jmp (N));                       // and off we go to application
   asm(nop);
   asm(nop);

Hope this helps - my apologies if I misunderstood your question.

Classic/Legacy CodeWarrior中的主题 absolute jump to application from bootloader

absolute jump to application from bootloader

Re: absolute jump to application from bootloader