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/*
* Copyright (c) 2021, Shenzhen Academy of Aerospace Technology
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-11-16 Dystopia the first version
*/
#include "drv_timer.h"
#include "interrupt.h"
#include "common.h"
#include <rthw.h>
#include <rtthread.h>
/**
* This is the timer interrupt service routine.
*
*/
void rt_hw_systick_isr(void)
{
/* enter interrupt */
rt_interrupt_enter();
rt_tick_increase();
/* leave interrupt */
rt_interrupt_leave();
}
/**
* The function initial system timer interrupt.
*/
void rt_hw_system_timer_init(void)
{
// initial system timer interrupt, map local timer interrupt to INT14
gp_cgem_regs->INTMUX3 = (CSL_GEM_TINTLN << CSL_CGEM_INTMUX3_INTSEL14_SHIFT);
// enable CPU INT14
rt_hw_interrupt_umask(1 << 14);
return ;
}
/**
* The function initial system timer.
* Use local timer (== DNUM of a core) to generate a clock on TIMO0,interrupts are generated as well
*
*/
void rt_hw_system_timer_start(void)
{
Timer64_Config tmrCfg;
// select output on TIMO0 from local timer.
gp_bootcfg_regs->TOUTSEL = (DNUM*2) << CSL_BOOTCFG_TOUTSEL_TOUTSEL0_SHIFT;
// configure the timer to generate clocks and interrupts
tmrCfg.timer_num = DNUM;
tmrCfg.timerMode = TIMER_PERIODIC_CLOCK;
tmrCfg.period = (unsigned long long) RT_TICK_PER_SECOND * DSP_CORE_SPEED_HZ / 6000;
tmrCfg.reload_period = 0;
// initial timer
timer64_init(&tmrCfg);
}
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