Lpc2000

No I was just using the startup file given with Keil's IDE for ADS...
 
Section of Startup.s
 
; Setup Stack for each mode
                LDR     R0, =Top_Stack
;  Enter Undefined Instruction Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_UND:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #UND_Stack_Size
;  Enter Abort Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_ABT:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #ABT_Stack_Size
;  Enter FIQ Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_FIQ:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #FIQ_Stack_Size
;  Enter IRQ Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_IRQ:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #IRQ_Stack_Size
;  Enter Supervisor Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_SVC:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #SVC_Stack_Size
;  Enter User Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_USR
          MOV     SP, R0

; Enter the C code
                IMPORT  __main
                LDR     R0, =__main
                BX      R0

The gcc Startup files have the loop to move .data section and clear the .bss section before jumping to main so I assume there is a setting in ADS to do this automatically during assembly? Like I say, the code wont execute on anything with global variables....I get either random data or program crash and that it must be due to how im initializing the micro!
 
David.
 


Peter <pmaloy@...> wrote:
--- In lpc2000@yahoogroups.com, David Bermingham <crwpulsar@y...> 
wrote:
> Hi Peter,
> Thanks for the info....that solved the IAP issue!!Works prefectly 
now!
>  
> As regards the second problem/issue, The startup file Im using 
just initialises the exception vectors, stacks and branches to main
(). Do I need another assembly routine to move the data from Flash 
to RAM?? I thought the scatterloading file set that up?
> The problem I have is that any global variables or buffers in the 
code seem to cause the error! I can remove the problem by using 
local variables and passing them between functions but this is less 
than pretty!!!
>  
> Thanks,
> David
>  

Hi David,

Excellent - glad the IAP is working now. For the scatterloading 
problem, try branching to __main instead of main. Have you also 
written your own version of __user_initial_stackheap, to tell the C 
startup code where to place the heap base and stack limit?

Peter.





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