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Andreas Mieke 2018-03-15 14:34:23 +01:00
commit 1f0e2aad64
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Mieke/Tutorial/Listings/asm.s Normal file
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AREA BLINKEN, CODE, READONLY
INCLUDE STM32_F103RB_MEM_MAP.INC
EXPORT __main
__main PROC
BL init_port
LDR R1, =GPIOB_ODR
_main_again LDR R0, [R1]
EOR R0, R0, #0x100
STR R0, [R1]
BL wait_500ms
B _main_again
ENDP
init_port PROC
PUSH {R0-R2, LR}
MOV R2, #0x8
LDR R1, =RCC_APB2ENR
LDR R0, [R1]
ORR R0, R0, R2
STR R0, [R1]
LDR R1, =GPIOB_CRH
LDR R0, [R1]
LDR R2, =0xFFFFFFF0
AND R0, R0, R2
MOV R2, #0x03
ORR R0, R0, R2
STR R0, [R1]
POP {R0-R2, PC}
ENDP
wait_500ms PROC
PUSH {R0-R2, LR}
MOV R0, #0x1F4
MOV R1, #0
_wait_ms_loop MOV R2, #0x63B
_wait_ms_loop1 SUB R2, R2, #1
CMP R2, R1
BNE _wait_ms_loop1
SUB R0, R0, #1
CMP R0, R1
BNE _wait_ms_loop
POP {R0-R2, PC}
ENDP
END