93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/**************************************************************************//**
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*
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* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
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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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* 2020-11-11 Wayne First version
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*
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******************************************************************************/
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#include "rtthread.h"
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#include "NuMicro.h"
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#include "drv_sys.h"
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#include "nu_timer.h"
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#define USE_TIMER 4
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/* Concatenate */
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#define _CONCAT2_(x, y) x##y
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#define _CONCAT3_(x, y, z) x##y##z
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#define CONCAT2(x, y) _CONCAT2_(x, y)
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#define CONCAT3(x, y, z) _CONCAT3_(x,y,z)
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/* Concatenate the macros of timer instance for driver usage. */
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#define SYSTICK_IRQ CONCAT2(IRQ_TMR, USE_TIMER )
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#define SYSTICK_CLKEN CONCAT3(TIMER, USE_TIMER, CKEN)
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#define SYSTICK_RST CONCAT3(TIMER, USE_TIMER, RST)
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static void nu_systick_isr(int vector, void *param)
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{
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rt_tick_increase();
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TIMER_ClearIntFlag(USE_TIMER);
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}
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void rt_hw_systick_init(void)
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{
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nu_sys_ipclk_enable(SYSTICK_CLKEN);
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nu_sys_ip_reset(SYSTICK_RST);
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// Set timer frequency
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TIMER_Open(USE_TIMER, TIMER_PERIODIC_MODE, RT_TICK_PER_SECOND);
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// Enable timer interrupt
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TIMER_EnableInt(USE_TIMER);
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rt_hw_interrupt_install(SYSTICK_IRQ, nu_systick_isr, RT_NULL, "systick");
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rt_hw_interrupt_set_priority(SYSTICK_IRQ, IRQ_LEVEL_1);
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rt_hw_interrupt_umask(SYSTICK_IRQ);
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TIMER_Start(USE_TIMER);
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} /* rt_hw_systick_init */
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void rt_hw_us_delay(rt_uint32_t us)
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{
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rt_uint32_t ticks;
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rt_uint32_t told, tnow, tcnt = 0;
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rt_uint32_t cmp = TIMER_GetCompareData(USE_TIMER);
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ticks = us * cmp / (1000000 / RT_TICK_PER_SECOND);
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told = TIMER_GetCounter(USE_TIMER);
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while (1)
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{
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/* Timer counter is increment. */
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tnow = TIMER_GetCounter(USE_TIMER);
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if (tnow != told)
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{
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/* 0 -- old === now -------- cmp */
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if (tnow > told)
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{
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tcnt += tnow - told;
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}
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else
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{
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/* 0 == now --- old ======== cmp */
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tcnt += cmp - told + tnow;
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}
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told = tnow;
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/* Timeout */
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if (tcnt >= ticks)
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{
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break;
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}
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}
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}
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} /* rt_hw_us_delay */
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