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Stack initialization with constant

John FitzGerald

Doe Keil IDE support initializing stack space with a constant? For example with a #define. If not, please does someone have ARM Cortex M3/M4 assembler code to do that and where should it be located? For example in startup*.s prior to the branch to main?

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  • 0 in reply to John FitzGerald

    Hi John,

    Why modify the scatter file?
    It's not easy to put the code in the stack initalisation?
    The ram is initialized before.

    __user_initial_stackheap

                 LDR     R0, =Stack_Mem            ; Test stack
                 LDR     R1, =Stack_Size           ;
                 LDR     R2, =0xCCCCCCCC           ;
Fill             STR     R2, [R0], #4              ;
                 SUBS    R1,#4                     ;
                 BNE     Fill                      ;


                LDR     R0, =  Heap_Mem
                LDR     R1, =(Stack_Mem + Stack_Size)
                LDR     R2, = (Heap_Mem +  Heap_Size)
                LDR     R3, = Stack_Mem
                BX      LR

                ALIGN

    thank you for your thread, it helped me a lot.

Reply
  • 0 in reply to John FitzGerald

    Hi John,

    Why modify the scatter file?
    It's not easy to put the code in the stack initalisation?
    The ram is initialized before.

    __user_initial_stackheap

                 LDR     R0, =Stack_Mem            ; Test stack
                 LDR     R1, =Stack_Size           ;
                 LDR     R2, =0xCCCCCCCC           ;
Fill             STR     R2, [R0], #4              ;
                 SUBS    R1,#4                     ;
                 BNE     Fill                      ;


                LDR     R0, =  Heap_Mem
                LDR     R1, =(Stack_Mem + Stack_Size)
                LDR     R2, = (Heap_Mem +  Heap_Size)
                LDR     R3, = Stack_Mem
                BX      LR

                ALIGN

    thank you for your thread, it helped me a lot.

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