51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
/*
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* Copyright (c) 2012 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* 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 NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/types.h>
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#include <string.h>
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#include <stdlib.h>
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#include <debug.h>
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#include <trace.h>
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#include <kernel/thread.h>
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#include <arch/arm.h>
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#include <arch/arm/cm.h>
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void arm_cm_systick_init(void)
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{
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NVIC_SetPriority(SysTick_IRQn, arm_cm_medium_priority());
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}
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void arm_cm_systick_set_periodic(uint32_t systick_clk_freq, lk_time_t period)
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{
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uint32_t ticks = systick_clk_freq / (1000 / period);
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SysTick->LOAD = (ticks & SysTick_LOAD_RELOAD_Msk) - 1;
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SysTick->VAL = 0;
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SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_TICKINT_Msk | SysTick_CTRL_ENABLE_Msk;
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}
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void arm_cm_systick_cancel_periodic(void)
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{
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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}
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