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stm32l100-asm-bootstrap
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Ondřej Hruška 9 years ago
parent bb797d4297
commit c8ad62ff81
1 changed files with 3 additions and 1 deletions
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      main.asm

4
main.asm
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@ -129,14 +129,16 @@ GPIO_CNF
; Output pins C8, C9 ; Output pins C8, C9
LDR R0, =GPIOC_MODER LDR R0, =GPIOC_MODER
LDR R1, [R0] LDR R1, [R0]
; Clear the area we'll write to
BIC R1,R1, #(GPIO_MODER_8 :OR: GPIO_MODER_9) BIC R1,R1, #(GPIO_MODER_8 :OR: GPIO_MODER_9)
; Write "OUTPUT" pattern (0x5555...) masked to the two bits
ORR R1,R1, #(GPIO_MODER_8 :OR: GPIO_MODER_9) & GPIO_MODER_OUTPUT ORR R1,R1, #(GPIO_MODER_8 :OR: GPIO_MODER_9) & GPIO_MODER_OUTPUT
STR R1, [R0] STR R1, [R0]
; Input pin A0 ; Input pin A0
LDR R0, =GPIOA_MODER LDR R0, =GPIOA_MODER
LDR R1, [R0] LDR R1, [R0]
BIC R1,R1, #GPIO_MODER_0 ; Clear the bit config area BIC R1,R1, #GPIO_MODER_0
ORR R1,R1, #(GPIO_MODER_0 & GPIO_MODER_INPUT); Write the "input" pattern into the bit config area ORR R1,R1, #(GPIO_MODER_0 & GPIO_MODER_INPUT); Write the "input" pattern into the bit config area
STR R1, [R0] STR R1, [R0]

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