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70 lines
1.4 KiB
70 lines
1.4 KiB
5 months ago
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2018/10/28 Bernard The unify RISC-V porting code.
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <encoding.h>
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#include "sbi.h"
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#include "tick.h"
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static volatile uint64_t time_elapsed = 0;
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static volatile unsigned long tick_cycles = 0;
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static unsigned long tick_delta = TIMER_CLK_FREQ / RT_TICK_PER_SECOND;
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static uint64_t get_ticks()
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{
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__asm__ __volatile__(
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"rdtime %0"
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: "=r"(time_elapsed));
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return time_elapsed;
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}
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int tick_isr(void)
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{
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rt_tick_increase();
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sbi_set_timer(get_ticks() + tick_delta);
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return 0;
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}
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/* Sets and enable the timer interrupt */
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int rt_hw_tick_init(void)
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{
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/* Clear the Supervisor-Timer bit in SIE */
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clear_csr(sie, SIP_STIP);
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/* Set timer */
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sbi_set_timer(get_ticks() + tick_delta);
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/* Enable the Supervisor-Timer bit in SIE */
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set_csr(sie, SIP_STIP);
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return 0;
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}
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/**
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* This function will delay for some us.
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*
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* @param us the delay time of us
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*/
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void rt_hw_us_delay(rt_uint32_t us)
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{
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unsigned long start_time;
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unsigned long end_time;
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unsigned long run_time;
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start_time = get_ticks();
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end_time = start_time + us * (TIMER_CLK_FREQ / 1000000);
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do
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{
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run_time = get_ticks();
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} while(run_time < end_time);
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}
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