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STM32F1 LL库示例 - SysTick

//1ms计数
volatile uint32_t g_SysTimer;

//初始化
void InitTick(void)
{
  g_SysTimer=0;

  SysTick_Config(72000);
  LL_SetSystemCoreClock(72000000);
}

//系统定时器中断函数(1ms中断)
void SysTick_Handler( void )
{
  g_SysTimer++;
  frm_inc_timer_tick();
}

//获取当前定时值
uint32_t GetCurrentTick(void)
{
  uint32_t ret;
  CLI();
  ret=g_SysTimer;
  SEI();
  return ret;
}
//计算过去时间
uint32_t GetPassedTick(uint32_t t)
{
  uint32_t cur=GetCurrentTick();

  if(cur>=t)
    return (cur-t);

  return (cur+(0xffffffff-t));
}
//延时
void SysDelayMs(uint32_t t)
{
  uint32_t tick=GetCurrentTick();
  while(GetPassedTick(tick)<t);
}