Lpc2000

You can load your HEX file in the the flash utility, generate the 
checksum (Vector calc button in the flash screen) and save the HEX 
file back.

Richard

--- In lpc2000@yahoogroups.com, rob@u... wrote:
> 
> > Is it true that Phillips ISP does the checksum calculation before
> > programming the vector code into flash?
> 
> > I notice the .hex files that I'm making (using IAR's software) 
> > doesn't contain the calculated checksum (0x14)for the vector 
code. 
> > It's usually filled with 0's (without the fill option).
> 
> > Is there's a way for me to generate the vector checksum in the 
0x14 
> > space of the hex file?
> 
> Leighton,
> 
> This is what I do.
> 
> The vector table for the processor (The first 32 bytes of memory)
> normally has branches to the routines. Since routine addresses 
change
> as code is changed, the checksum changes.
> 
> I created a table of seven addresses located immediately after the
> vector table. These seven addresses are the start addresses for 
reset
> and the interrupts. The branch instructions of the interrupt vector
> table were replaced with a load PC instruction pointing to the
> appropriate address.
> 
> The hex file will then have the checksum. My startup code below:
> 
> @------------------------------------------------------------------
---------
> @ Interrupt vectors
> @------------------------------------------------------------------
---------
> intvect:
> 
>         LDR     pc, startaddr
>         LDR     pc, undefinstaddr
>         LDR     pc, softintaddr
>         LDR     pc, preabortaddr
>         LDR     pc, dataabortaddr
>         .word   0xb8a06f60
>         LDR     pc, interruptaddr
>         LDR     pc, fastintaddr
> 
> startaddr:
>         .word   start
> 
> undefinstaddr:
>         .word   undefined_instruction_routine
> 
> softintaddr:
>         .word   software_interrupt_routine
> 
> preabortaddr:
>         .word   prefetch_abort_routine
> 
> dataabortaddr:
>         .word   data_abort_routine
> 
> interruptaddr:
>         .word   interrupt_routine
> 
> fastintaddr:
>         .word   fast_interrupt_routine
> 
> 
> @------------------------------------------------------------------
---------
> @ Start up code
> @------------------------------------------------------------------
---------
> 
> start:
> 
>  <code...>