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-rw-r--r--libmaple/include/libmaple/delay.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/libmaple/include/libmaple/delay.h b/libmaple/include/libmaple/delay.h
index 472a208..fbe7d1b 100644
--- a/libmaple/include/libmaple/delay.h
+++ b/libmaple/include/libmaple/delay.h
@@ -50,12 +50,12 @@ static inline void delay_us(uint32 us) {
/* fudge for function call overhead */
us--;
- asm volatile(" mov r0, %[us] \n\t"
- "1: subs r0, #1 \n\t"
+ asm volatile("1: subs %[us], #1 \n\t"
" bhi 1b \n\t"
+ : [us] "=r" (us)
+ : "[us]" (us)
:
- : [us] "r" (us)
- : "r0");
+ );
}
#ifdef __cplusplus