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128 lines
2.6 KiB
128 lines
2.6 KiB
;***************************************************************************************************
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;*
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;* Skeleton of a main file using the standard startup script
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;* and the sfr_XXX.asm register defintions file.
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;*
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;* Add your device- and project-specific code to this base file.
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;*
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;* (c) Ondrej Hruska, 2016
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;*
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;***************************************************************************************************
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AREA MAIN, CODE, READONLY
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; this is required by the startup script (?)
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__use_two_region_memory
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EXPORT __use_two_region_memory
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;;;--- Include library files -----------------------
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;;
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; [ include your register definitions file here ]
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GET sfr_XXX.asm
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; ... and any other files you want
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;;
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;;;-------------------------------------------------
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;;;--- Constants -----------------------------------
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;;
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;; This is the equivalent of #define in C
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;;
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FOO EQU 2_01010101
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BAR EQU 0x1234ABCD
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BAZ EQU 137
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;;
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;;;-------------------------------------------------
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;;;--- ROM data ------------------------------------
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;; This data will be embedded in the output binary
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;;
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;; example use:
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;; LDR R2, =HELLO_TXT ; load string address
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;; LDR R1, [R2] ; load first character
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;;
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HELLO_TXT DCB "Hello world!\r\n", 0
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;;
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;;;-------------------------------------------------
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;;;-------------------------------------------------
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;; System config.
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;;
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;; Called by startup script before __main
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;;
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SystemInit PROC
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EXPORT SystemInit ; Export to startup script
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PUSH {LR}
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; [ Call your init routines ]
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BL Cfg_RCC
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; ...
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POP {PC}
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ENDP
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;;
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;;;-------------------------------------------------
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;;;-------------------------------------------------
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;; Main function
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;;
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;; Called by startup script after SystemInit.
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;; __main is called only once, and does not return!
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;;
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ALIGN
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__main PROC
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EXPORT __main ; Export to startup script
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MAIN_LOOP ; Main loop
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; [ put your main loop code here ]
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BL MyFunction
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B MAIN_LOOP ; Jump to start of the main loop
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ENDP
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;;
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;;;-------------------------------------------------
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; [ Put your functions here ]
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;;;-------------------------------------------------
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;; Example function definition
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;;
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MyFunction PROC
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PUSH {R0-R2, LR} ; Push all registers you will change, and LR
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; [ Do your thing ]
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POP {R0-R2, PC} ; Restore pushed registers and jump back to caller
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ENDP
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;;
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;;;-------------------------------------------------
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;; end of file, aligned to 4 bytes
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ALIGN
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END
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