text: /*
   * Copyright (c) 2006-2019, RT-Thread Development Team
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   * Change Logs:
   * Date           Author       Notes
   * 2021-05-24                  the first version
   */
  
  #include <rthw.h>
  #include <rtthread.h>
  
  #include "stm32l0xx_ll_system.h"
  
  #if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
  /*
   * Please modify RT_HEAP_SIZE if you enable RT_USING_HEAP
   * the RT_HEAP_SIZE max value = (sram size - ZI size), 2048 means 2048*4 bytes
   */
  #define RT_HEAP_SIZE 2048
  
  static uint32_t rt_heap[RT_HEAP_SIZE];
  RT_WEAK void *rt_heap_begin_get(void)
  {
      return rt_heap;
  }
  
  RT_WEAK void *rt_heap_end_get(void)
  {
      return rt_heap + RT_HEAP_SIZE;
  }
  #endif
  
  uint32_t __SysTick_Config(uint32_t ticks)
  {
    if ((ticks - 1UL) > SysTick_LOAD_RELOAD_Msk)
    {
      return (1UL);                                                   /* Reload value impossible */
    }
  
    SysTick->LOAD  = (uint32_t)(ticks - 1UL);                         /* set reload register */
    NVIC_SetPriority (SysTick_IRQn, (1UL << __NVIC_PRIO_BITS) - 1UL); /* set Priority for Systick Interrupt */
    SysTick->VAL   = 0UL;                                             /* Load the SysTick Counter Value */
    SysTick->CTRL  = SysTick_CTRL_CLKSOURCE_Msk |
                     SysTick_CTRL_TICKINT_Msk   |
                     SysTick_CTRL_ENABLE_Msk;                         /* Enable SysTick IRQ and SysTick Timer */
    return (0UL);                                                     /* Function successful */
  }
  
  /**
   * This function will initial your board.
   */
  void rt_hw_board_init(void)
  {
      /* TODO: OS Tick Configuration */
      __SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
  
      /* Call components board initial (use INIT_BOARD_EXPORT()) */
  #ifdef RT_USING_COMPONENTS_INIT
      rt_components_board_init();
  #endif
  
  #if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
      rt_system_heap_init(rt_heap_begin_get(), rt_heap_end_get());
  #endif
  }
  
  /* TODO: OS Tick increase */
  void SysTick_Handler(void)
  {
      /* enter interrupt */
      rt_interrupt_enter();
  
      rt_tick_increase();
  
      /* leave interrupt */
      rt_interrupt_leave();
  }
  
  
  /* TODO: uart init and console output */
  #ifdef RT_USING_CONSOLE
  
  static int uart_init(void)
  {
  #error "Please implement the code according to your chip"
      return 0;
  }
  INIT_BOARD_EXPORT(uart_init);
  
  /* For console print */
  void rt_hw_console_output(const char *str)
  {
  #error "Please implement the code according to your chip"
  }
  
  #endif
  
  