Lpc2000

Hello Charles,

Thank U!

I found another prob., but now the problem is to change to thumb mode.
How to put the processor from ARM mode to THUMB mode by using ASM 
COMMANDS.

    LDR          R0, =0xE002C000
    MOV          R1, #10
    STR          R1, [R0, #0]
    LDR          R0, =0xE001400C
    MOV          R1, #0
    STR          R1, [R0, #0]

Kindly explain me the STATEMENT 

    STR          R1, [R0, #0]
what it does.
upto my knowledge i think it will store the value 0 to R0.


Kindly exaplain me how to pu the processor in thumb mode.

with regds,
Rajendra R


--- In lpc2000@yahoogroups.com, Charles Manning <manningc2@a...> 
wrote:
> On Tuesday 29 March 2005 16:53, rockraj_2003 wrote:
> > Hello Friends,
> >
> > I am using IAR EMBEDDED WORKBENCH.
> > The code shown below is produced by the IAR compiler.
> > I want to know what is the offset & how they are using the OFFSET 
in
> > PC.
> >
> > Can any one explain me the below program.
> >
> >
> >  MEMMAP = 2;
> >       LDR          R0, [PC,#0x354] [0x68C] =MEMMAP (0xE01FC040)
> >       MOV          R1, #2
> >       STRB         R1, [R0, #0]
> >
> >   PINSEL0  = 0x0000000A;
> >  0x0000033C 48D4      LDR          R0, [PC,#0x350]; [0x690] 
=PINSEL0
> > (0xE002C000)
> >  0x0000033E 210A      MOV          R1, #10
> >  0x00000340 6001      STR          R1, [R0, #0]
> >
> >
> > Explain me the LDR & how it points to this address.0xE01FC040
> >
> >       LDR          R0, [PC,#0x354] [0x68C] =MEMMAP (0xE01FC040)
> 
> This is using what is called a literal pool. The actual address is 
not part 
> of the instruction, but is stored.
> 
> When you write code like this you do it as follows:
>    ldr r0, =0xE01FC040
> 
> The assembler then saves the value futrther on in the .text segment 
and sets 
> up an instruction to point to that using an offset relative to the 
PC.
> 
> ie.
> 
>     ldr r0,[PC,#offset_to_where_value_is_stored]
> 
> value_stored_here:
>           .word  0xE01FC040
> 
> 
> 
> 
> 
> 
> >
> > kindly help me,
> >
> > with regards,
> > Rajendra R
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >