1 files changed, 22 insertions, 0 deletions
diff --git a/libmaple/delay.h b/libmaple/delay.h
new file mode 100644
index 0000000..10839c9
--- /dev/null
+++ b/libmaple/delay.h
@@ -0,0 +1,22 @@
+/**
+ *  @brief 
+ */
+
+#ifndef _DELAY_H_
+#define _DELAY_H_
+
+static inline void delay_us(uint32 us) {
+    /* So (2^32)/12 micros max, or less than 6 minutes */
+    us *= 12;
+
+    /* fudge for function call overhead  */
+    us--;
+    asm volatile("   mov r0, %[us]          \n\t"
+                 "1: subs r0, #1            \n\t"
+                 "   bhi 1b                 \n\t"
+                 :
+                 : [us] "r" (us)
+                 : "r0");
+}
+#endif
+