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/*
* Copyright (c) 2006-2020, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-02-11 supperthomas first version
*
*/
#include <rtthread.h>
#include <rthw.h>
#include <stdio.h>
#include "board.h"
#include "mxc_sys.h"
#ifdef RT_USING_SERIAL
#include "drv_usart.h"
#endif
/**
* This is the timer interrupt service routine.
*
*/
void SysTick_Handler(void)
{
/* enter interrupt */
rt_interrupt_enter();
rt_tick_increase();
/* leave interrupt */
rt_interrupt_leave();
}
void rt_hw_systick_init(void)
{
uint32_t error;
error = SYS_SysTick_Config(SYS_SysTick_GetFreq() / RT_TICK_PER_SECOND, 1, MXC_TMR0);
if (error != E_NO_ERROR)
{
rt_kprintf("ERROR: Ticks is not valid");
}
}
void rt_hw_board_init(void)
{
rt_hw_systick_init();
#if defined(RT_USING_HEAP)
rt_system_heap_init((void *)(HEAP_BEGIN), (void *)(HEAP_END));
#endif
#ifdef RT_USING_SERIAL
rt_hw_usart_init();
#endif
#if defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE)
rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
#endif
#ifdef RT_USING_COMPONENTS_INIT
rt_components_board_init();
#endif
}
void rt_hw_us_delay(rt_uint32_t us)
{
rt_uint32_t start, now, delta, reload, us_tick;
start = SysTick->VAL;
reload = SysTick->LOAD;
us_tick = SystemCoreClock / 1000000UL;
do
{
now = SysTick->VAL;
delta = start >= now ? start - now : reload + start - now;
}
while (delta < us_tick * us);
}
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