配置

main.c

void SYSTICK_Init_Config(u_int64_t ticks)
{
    SysTick->SR &= ~(1 << 0);//clear State flag
    SysTick->CMP = ticks - 1;
    SysTick->CNT = 0;
    SysTick->CTLR = 0xF;

    NVIC_SetPriority(SysTicK_IRQn, 15);
    NVIC_EnableIRQ(SysTicK_IRQn);
}

中断计数

main.c

uint32_t counter = 0;
void SysTick_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));

void SysTick_Handler(void)
{
    if(SysTick->SR == 1)
    {
        SysTick->SR = 0;//clear State flag
        counter++;
        printf("Counter:%d\r\n",counter);
    }
}

周期配置

main.c

秒

	SYSTICK_Init_Config(SystemCoreClock);

毫秒

	SYSTICK_Init_Config(SystemCoreClock/1000);