82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
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* File : board_coretimer.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2017-01-01 Urey first version
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include "board.h"
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#include "board_coretimer.h"
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#include <stdint.h>
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static inline unsigned int readreg32(volatile unsigned int *addr)
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{
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return *(volatile unsigned int *)addr;
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}
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static inline void writereg32(unsigned int b, volatile unsigned int *addr)
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{
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*(volatile unsigned int *)addr = b;
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}
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void CKTimerInit(uint32_t timer_id, uint32_t freq)
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{
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uint32_t reg;
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writereg32(APB_DEFAULT_FREQ / freq, CORET_RVR);
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writereg32(0, CORET_CVR);
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reg = readreg32(CORET_CSR);
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reg |= CORETIM_TXCONTROL_ENABLE;
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reg |= CORETIM_TXCONTROL_INTMASK;
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writereg32(reg, CORET_CSR);
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return;
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}
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void CKTimerClear(uint32_t timer_id)
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{
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uint32_t reg;
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reg = readreg32(CORET_CSR);
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reg |= ~CORETIM_TXCONTROL_MODE;
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writereg32(reg, CORET_CSR);
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}
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uint32_t CKTimer_CurrentValue(void)
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{
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return readreg32(CORET_CVR);
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}
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void __attribute__((isr)) SysTick_Handler(void)
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{
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CKTimerClear(0x1);
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/* enter interrupt */
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rt_interrupt_enter();
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rt_tick_increase();
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/* leave interrupt */
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rt_interrupt_leave();
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}
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