You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
32 lines
729 B
32 lines
729 B
9 years ago
|
;;;-------------------------------------------------
|
||
|
|
;; Configure GPIO - PA5 as output (LED)
|
||
|
|
;;
|
||
|
|
Cfg_GPIO PROC
|
||
|
|
PUSH {R0-R2, LR}
|
||
|
|
|
||
|
|
; Enable GPIO clocks
|
||
|
|
LDR R2, =RCC_AHBENR ; AHBENR address
|
||
|
|
LDR R1, [R2]
|
||
|
|
LDR R0, =RCC_AHBENR_IOPAEN ; strange bit names, only on F303
|
||
|
|
ORR R1, R0
|
||
|
|
STR R1, [R2]
|
||
|
|
|
||
|
|
; Configure MODER
|
||
|
|
LDR R2, =GPIOA_MODER
|
||
|
|
LDR R1, [R2]
|
||
|
|
BIC R1, #GPIO_MODER_MODER5
|
||
|
|
LDR R0, =(2_01 << GPIO_MODER_MODER5_ofs); 2_01 = output mode
|
||
|
|
ORR R1, R0
|
||
|
|
|
||
|
|
; Store modified value back to MODER
|
||
|
|
STR R1, [R2]
|
||
|
|
|
||
|
|
; TODO: can now also configure OType and other registers
|
||
|
|
|
||
|
|
POP {R0-R2, PC}
|
||
|
|
ENDP
|
||
|
|
;;
|
||
|
|
;;;-------------------------------------------------
|
||
|
|
|
||
|
|
END
|