circuitpython/ports/nrf/hal/hal_time.c

117 lines
2.7 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Glenn Ruben Bakke
*
* 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.
*/
#include "mphalport.h"
#include "hal_time.h"
#ifdef HAL_TIME_MODULE_ENABLED
void mp_hal_delay_us(mp_uint_t us)
{
register uint32_t delay __ASM ("r0") = us;
__ASM volatile (
#ifdef NRF51
".syntax unified\n"
#endif
"1:\n"
" SUBS %0, %0, #1\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
#ifdef NRF52
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
" NOP\n"
#endif
" BNE 1b\n"
#ifdef NRF51
".syntax divided\n"
#endif
: "+r" (delay));
}
void mp_hal_delay_ms(mp_uint_t ms)
{
for (mp_uint_t i = 0; i < ms; i++)
{
mp_hal_delay_us(999);
}
}
#endif // HAL_TIME_MODULE_ENABLED