kopia lustrzana https://github.com/micropython/micropython
117 wiersze
2.7 KiB
C
117 wiersze
2.7 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Glenn Ruben Bakke
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies 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 included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "mphalport.h"
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#include "hal_time.h"
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#ifdef HAL_TIME_MODULE_ENABLED
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void mp_hal_delay_us(mp_uint_t us)
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{
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register uint32_t delay __ASM ("r0") = us;
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__ASM volatile (
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#ifdef NRF51
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".syntax unified\n"
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#endif
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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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#ifdef NRF52
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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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" 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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" 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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" 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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#endif
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" BNE 1b\n"
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#ifdef NRF51
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".syntax divided\n"
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#endif
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: "+r" (delay));
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}
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void mp_hal_delay_ms(mp_uint_t ms)
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{
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for (mp_uint_t i = 0; i < ms; i++)
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{
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mp_hal_delay_us(999);
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}
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}
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#endif // HAL_TIME_MODULE_ENABLED
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