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/*
* Copyright (c) 2022-2025, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2025-01-22 chasel first version
*/
#include <board.h>
extern uint32_t SystemCoreClock;
extern void SystemInit(void);
/**
* this function will delay for some us.
*
* @param us the delay time of us
*/
void rt_hw_us_delay(rt_uint32_t us)
{
rt_uint32_t ticks;
rt_uint32_t told, tnow, tcnt = 0;
rt_uint32_t reload = SysTick->LOAD;
ticks = us * reload / (1000000 / RT_TICK_PER_SECOND);
told = SysTick->VAL;
while (1) {
tnow = SysTick->VAL;
if (tnow != told) {
if (tnow < told) {
tcnt += told - tnow;
} else {
tcnt += reload - tnow + told;
}
told = tnow;
if (tcnt >= ticks) {
break;
}
}
}
}
static void bsp_clock_config(void)
{
SystemInit();
SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
SysTick->CTRL |= 0x00000004UL;
}
void SysTick_Handler(void)
{
/* enter interrupt */
rt_interrupt_enter();
rt_tick_increase();
/* leave interrupt */
rt_interrupt_leave();
}
void rt_hw_board_init()
{
bsp_clock_config();
#if defined(RT_USING_HEAP)
rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END);
#endif
#ifdef RT_USING_PIN
extern int rt_hw_pin_init(void);
rt_hw_pin_init();
#endif
#ifdef RT_USING_SERIAL
extern int rt_hw_uart_init(void);
rt_hw_uart_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
}
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