e8c974423c
This reverts commit 715a63dccb. It fails
to build using the 2010 CodeSourcery toolchain, which is still the latest
officially supported version.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
66 lines
2 KiB
C
66 lines
2 KiB
C
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Perry Hung.
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* Copyright (c) 2011 LeafLabs, LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file libmaple/include/libmaple/delay.h
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* @brief Delay implementation
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*/
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#ifndef _LIBMAPLE_DELAY_H_
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#define _LIBMAPLE_DELAY_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <libmaple/libmaple_types.h>
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#include <libmaple/stm32.h>
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/**
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* @brief Delay the given number of microseconds.
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*
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* @param us Number of microseconds to delay.
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*/
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static inline void delay_us(uint32 us) {
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us *= STM32_DELAY_US_MULT;
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/* fudge for function call overhead */
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us--;
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asm volatile(" mov r0, %[us] \n\t"
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"1: subs r0, #1 \n\t"
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" bhi 1b \n\t"
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:
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: [us] "r" (us)
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: "r0");
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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