52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
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/*
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Copyright (C) 2015 Stephen Caudle
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file NRF51822/nrf51_delay.h
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* @brief NRF51822 Delay routines
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*
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* @{
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*/
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#ifndef _NRF_DELAY_H
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#define _NRF_DELAY_H
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inline static void nrf_delay_us(uint32_t volatile number_of_us) __attribute__((always_inline));
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inline static void nrf_delay_us(uint32_t volatile number_of_us)
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{
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register uint32_t delay asm ("r0") = number_of_us;
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__asm volatile (
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".syntax unified\n"
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"1:\n"
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" SUBS %0, %0, #1\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" BNE 1b\n"
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".syntax divided\n"
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: "+r" (delay));
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}
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#endif //__NRF_DELAY_H
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