board.c

/*
 * Copyright (c) 2006-2019, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2017-07-24     Tanek        the first version
 * 2018-11-12     Ernest Chen  modify copyright
 */

#include <stdint.h>
#include <rthw.h>
#include <rtthread.h>

#define _SCB_BASE       (0xE000E010UL)
#define _SYSTICK_CTRL   (*(rt_uint32_t *)(_SCB_BASE + 0x0))
#define _SYSTICK_LOAD   (*(rt_uint32_t *)(_SCB_BASE + 0x4))
#define _SYSTICK_VAL    (*(rt_uint32_t *)(_SCB_BASE + 0x8))
#define _SYSTICK_CALIB  (*(rt_uint32_t *)(_SCB_BASE + 0xC))
#define _SYSTICK_PRI    (*(rt_uint8_t  *)(0xE000ED23UL))

// Updates the variable SystemCoreClock and must be called 
// whenever the core clock is changed during program execution.
extern void SystemCoreClockUpdate(void);

// Holds the system core clock, which is the system clock 
// frequency supplied to the SysTick timer and the processor 
// core clock.
extern uint32_t SystemCoreClock;

static uint32_t _SysTick_Config(rt_uint32_t ticks)
{
    if ((ticks - 1) > 0xFFFFFF)
    {
        return 1;
    }
    
    _SYSTICK_LOAD = ticks - 1; 
    _SYSTICK_PRI = 0xFF;
    _SYSTICK_VAL  = 0;
    _SYSTICK_CTRL = 0x07;  
    
    return 0;
}

#include "board.h"
void sdk_init();
/* SysTick configuration */
void rt_hw_systick_init(void)
{
#if defined (SOC_SERIES_STM32H7)
    HAL_SYSTICK_Config((HAL_RCCEx_GetD1SysClockFreq()) / RT_TICK_PER_SECOND);
#else
    HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq() / RT_TICK_PER_SECOND);
#endif
    HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
    HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

/**
 * This function will initial your board.
 */
void rt_hw_board_init()
{
    /* System Clock Update */
    SystemCoreClockUpdate();
    
		sdk_init();
    /* System Tick Configuration */
    _SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
		rt_hw_systick_init();

#if defined(RT_USING_HEAP)
    rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END);
#endif

    /* Call components board initial (use INIT_BOARD_EXPORT()) */
#ifdef RT_USING_COMPONENTS_INIT
    rt_components_board_init();
#endif

    rt_console_set_device(RT_CONSOLE_DEVICE_NAME);

}

void SysTick_Handler(void)
{
    /* enter interrupt */
    rt_interrupt_enter();

    rt_tick_increase();

    /* leave interrupt */
    rt_interrupt_leave();
}