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