求M0下的SysTick使用例程

只看该作者 · 2017-8-11 08:41

在用NM1200，没找到相关例程，求有的能共享个或发我个，谢谢！

只看该作者 · 2017-8-11 08:55

//systick handler不用清中斷flag,硬體會自已清。
void SysTick_Handler(void)
{
// do systick action...

}

static __INLINE uint32_t SysTick_Config(uint32_t ticks)
{
  if (ticks > SysTick_LOAD_RELOAD_Msk)  return (1);          /* Reload value impossible */

  SysTick->LOAD  = (ticks & SysTick_LOAD_RELOAD_Msk) - 1;    /* set reload register */
  NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority for Cortex-M0 System Interrupts */
  SysTick->VAL = 0;                                        /* 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 (0);                                                 /* Function successful */
}

int main(void)
{
SysTick_Config(SystemCoreClock / g_sampleRate);
while(1);
}