Lpc2000

Hi,

try to figure out with which values R1 und R2 are loaded before the 
loop (the values for the symbols __bss_start__ and __bss_end__).

Regards
XJAG

--- In lpc2000@yahoogroups.com, "arkeryd" <arkeryd@y...> wrote:
> Thanks, but...
> 
> I checked the .map file and it shows the same thing, the bss area 
ends
> at address 0x40001748.
> 
> The ram area ranges from 0x40000000 to 0x40003FFF and the stack is 
at
> the end of the ram area, and total stack size is below 0x500 bytes.
> 
> So as described below, it does't look like is an overlap conflict, 
but
>     main() refuses to start unless commenting out the clear bss code
> from startup.s.  
> 
> I can't even get some dummy code just setting the leds - using 
MBC2100
> dev board - followed by an eternal looop at beginning of main() to
> run, unless commenting out the code for clearing bss section.
> 
> Kind Regards
> 
> / DA
> 
> 
> 
> --- In lpc2000@yahoogroups.com, "xjag74" <detlef.weidner@w...> 
wrote:
> > Hi,
> > 
> > have a look to the Map-file.
> > Check if the bss area is within the range of the RAM memory area 
> > (below the stack area).
> > 
> > regards
> > xjag
> > 
> > 
> > --- In lpc2000@yahoogroups.com, "arkeryd" <arkeryd@y...> wrote:
> > > Hi,
> > > 
> > > After adding several new source files to my application for
> LPC2129,
> > > it hangs when jumping from startup.s to main(). 
> > > 
> > > The first thing that came to my mind was that perhaps too much 
ram
> > > memory was now used.
> > > However, after checking by running startup.s trough the 
debugger,
> it
> > > doesn't seem like that.
> > > I use the default startup.s for LPC2129.
> > > 
> > > The last address used by the .data- and .bss-sections
> > > (variables/arrays) in my application is 0x40001748.
> > > 
> > > And this should not collide with stack either, as I use the
> default
> > > stack address and sizes:
> > > Interrupt Mode size: 0x80
> > > User/system mode size: 0x400
> > > And just 4 bytes size in other modes.
> > > Top of stack address: 0x40004000.
> > > 
> > > The weird thing is even though no memory collision should occur,
> the
> > > application starts if I comment out the "Clear .bss section 
code"
> in
> > > startup.s, so it must somehow be some collision, but I don't
> > > understand why.
> > > 
> > > # Clear .bss section (Zero init)
> > >                 MOV     R0, #0
> > >                 LDR     R1, =__bss_start__
> > >                 LDR     R2, =__bss_end__
> > > LoopZI:         CMP     R1, R2
> > >                 STRLO   R0, [R1], #4
> > >                 BLO     LoopZI
> > > 
> > > Any input to clear my confusion would be much appreciated! :)