text: /**************************************************************************//**
  *
  * @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
  *
  * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date            Author       Notes
  * 2020-9-1        Philo        First version
  *
  ******************************************************************************/
  
  #include <rtconfig.h>
  #include <rtthread.h>
  #include "NuMicro.h"
  #include <nu_bitutil.h>
  #include "drv_uart.h"
  #include "board.h"
  #include "nutool_pincfg.h"
  #include "nutool_modclkcfg.h"
  
  
  
  /**
   * This function will initial M032 board.
   */
  RT_WEAK void rt_hw_board_init(void)
  {
      /* Init System/modules clock */
      nutool_modclkcfg_init();
  
      /* Unlock protected registers */
      SYS_UnlockReg();
  
      /* Init all pin function setting */
      nutool_pincfg_init();
  
      /* Configure SysTick */
      SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
  
      /* Update System Core Clock */
      /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */
      SystemCoreClockUpdate();
  
  #if defined(BSP_USING_EADC)
      /* Vref connect to internal */
      SYS->VREFCTL = (SYS->VREFCTL & ~SYS_VREFCTL_VREFCTL_Msk) | SYS_VREFCTL_VREF_3_0V;
  #endif
  
      /* Lock protected registers */
      SYS_LockReg();
  
  #ifdef RT_USING_HEAP
      rt_system_heap_init(HEAP_BEGIN, HEAP_END);
  #endif /* RT_USING_HEAP */
  
  #if defined(BSP_USING_UART)
      rt_hw_uart_init();
  #endif
  
  #ifdef RT_USING_CONSOLE
      rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
  #endif
  
  #ifdef RT_USING_COMPONENTS_INIT
      rt_components_board_init();
  #endif
  }
  
  /**
   * The time delay function.
   *
   * @param microseconds.
   */
  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;
              }
          }
      }
  }
  
  /**
   * 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_cpu_reset(void)
  {
      SYS_UnlockReg();
  
      SYS->IPRST0 |= SYS_IPRST0_CHIPRST_Msk;
  }
  
  #ifdef RT_USING_CPU_FFS
  int __rt_ffs(int value)
  {
      if (!value) return 0;
      return __CLZ(__RBIT(value)) + 1;
  }
  #endif
  
  #ifdef RT_USING_FINSH
  #include <finsh.h>
  static void reboot(uint8_t argc, char **argv)
  {
      rt_hw_cpu_reset();
  }
  MSH_CMD_EXPORT(reboot, Reboot System);
  #endif /* RT_USING_FINSH */
  