rt-thread/bsp/mm32f526x/board/board.c

/*
 * 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
}