45 lines
No EOL
657 B
ArmAsm
45 lines
No EOL
657 B
ArmAsm
; ce programme est pour l'assembleur RealView (Keil)
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thumb
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area moncode, code, readonly
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export timer_callback
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extern etat
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;
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GPIOB_BSRR equ 0x40010C10 ; Bit Set/Reset register
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timer_callback proc
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; mise a 1 de PB1
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push {lr}
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ldr r1, =etat ;chargement de la variable etat
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ldr r1, [r1]
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ldr r3, =GPIOB_BSRR
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cmp r1, #0x00020000 ;if(etat == 0){etat =1}else{etat=0}
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beq eq
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bne noteq
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gdc ldr r0, =etat
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str r1, [r0] ;on met à jour etat
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str r1, [r3] ;et GPIOB_BSRR
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; N.B. le registre BSRR est write-only, on ne peut pas le relire
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pop {lr}
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bx lr
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endp
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eq
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mov r1, #0x00000002
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b gdc
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noteq
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mov r1, #0x00020000
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b gdc
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end
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