Systick timer is a simple timer. Both CM3 and CM4 core chips have Systick timer.
Systick timer is often used for delay or heartbeat clock of real-time system. This can save MCU resources and avoid wasting a timer. For example, in UCOS, time-division multiplexing requires a minimum timestamp. Generally, in STM32+UCOS system, Systick is used as UCOS heartbeat clock.
The Systick timer is a system tick timer, a 24-bit countdown timer that automatically reloads the timing initial value from the RELOAD register when it counts to 0. As long as the enable bit in the SysTick control and status register is not cleared, it will never stop and can work even in sleep mode.
The SysTick timer is bundled in the NVIC and is used to generate a SYSTICK exception (exception number: 15).
The priority of the Systick interrupt can also be set.
Use interrupts to implement Delay:
static __IO uint32_t TimingDelay;void Delay(__IO uint32_t nTime)
{
TimingDelay = nTime; while(TimingDelay != 0);
}void SysTick_Handler(void)
{ if (TimingDelay != 0x00)
{
TimingDelay--;
}
}int main(void)
{ ... if (SysTick_Config(SystemCoreClock / 1000)) //The systick clock is HCLK, and the interrupt interval is 1ms
{ while (1);
} while(1)
{ Delay(200);//2ms
…
}
}
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