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117 lines
3.1 KiB
117 lines
3.1 KiB
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/**
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* \file
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*
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* \brief SysTick related functionality implementation.
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*
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* Copyright (C) 2016 Atmel Corporation. All rights reserved.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* \asf_license_stop
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*
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*/
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#include <hpl_time_measure.h>
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#include <compiler.h>
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#include <hpl_systick_config.h>
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#ifdef _UNIT_TEST_
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#include <hri_systick_ARMv7_mock.h>
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#endif
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/**
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* \brief Initialize system time module
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*/
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void _system_time_init(void *const hw)
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{
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(void)hw;
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SysTick->LOAD = (0xFFFFFF << SysTick_LOAD_RELOAD_Pos);
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SysTick->CTRL = (1 << SysTick_CTRL_ENABLE_Pos) | (CONF_SYSTICK_TICKINT << SysTick_CTRL_TICKINT_Pos)
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| (1 << SysTick_CTRL_CLKSOURCE_Pos);
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}
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/**
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* \brief Initialize delay functionality
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*/
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void _delay_init(void *const hw)
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{
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_system_time_init(hw);
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}
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/**
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* \brief De-initialize system time module
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*/
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void _system_time_deinit(void *const hw)
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{
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(void)hw;
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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}
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/**
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* \brief Get system time
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*/
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system_time_t _system_time_get(const void *const hw)
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{
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(void)hw;
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return (system_time_t)SysTick->VAL;
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}
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/**
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* \brief Get maximum possible system time
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*/
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system_time_t _system_time_get_max_time_value(const void *const hw)
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{
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(void)hw;
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return 0xFFFFFF;
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}
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/**
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* \brief Delay loop to delay n number of cycles
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*/
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void _delay_cycles(void *const hw, uint32_t cycles)
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{
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(void)hw;
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uint8_t n = cycles >> 24;
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uint32_t buf = cycles;
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while (n--) {
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SysTick->LOAD = 0xFFFFFF;
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SysTick->VAL = 0xFFFFFF;
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while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk))
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;
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buf -= 0xFFFFFF;
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}
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SysTick->LOAD = buf;
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SysTick->VAL = buf;
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while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk))
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;
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}
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