Lukas Bielesch
debug tool for STM32F042F6P6
Diff: check_alternative_mode.s
- Revision:
- 0:98789a3f7363
- Child:
- 24:bc7c4e8f3fe0
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/check_alternative_mode.s Mon Apr 15 13:00:43 2019 +0000
@@ -0,0 +1,29 @@
+ AREA asm_func, CODE, READONLY
+; Export my_asm function location so that C compiler can find it and link
+ EXPORT check_alternative_mode
+check_alternative_mode
+
+ PUSH {LR}
+ ;R0 = GPIOx
+ ;R1 = offset
+ ;r2 = pin_number
+
+
+ LDR R3, [R0, R1]
+
+ LDR R0, =28
+ SUBS R0,R2
+ SUBS R0,R2
+ SUBS R0,R2
+ SUBS R0,R2
+
+ LSLS R3,R3,R0
+ LSRS R3,#28
+
+ MOVS R0,R3
+
+ POP {PC}
+
+ ALIGN
+ END
+