1 files changed, 65 insertions, 0 deletions
diff --git a/libmaple/include/libmaple/delay.h b/libmaple/include/libmaple/delay.h
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+++ b/libmaple/include/libmaple/delay.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ * Copyright (c) 2011 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file delay.h
+ * @brief Delay implementation
+ */
+
+#ifndef _LIBMAPLE_DELAY_H_
+#define _LIBMAPLE_DELAY_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <libmaple/libmaple_types.h>
+#include <libmaple/stm32.h>
+
+/**
+ * @brief Delay the given number of microseconds.
+ *
+ * @param us Number of microseconds to delay.
+ */
+static inline void delay_us(uint32 us) {
+    us *= STM32_DELAY_US_MULT;
+
+    /* 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");
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif