1. Introduction to SysTick Register
For SysTick, please refer to the Programming manual. There are 4 registers in total, as shown in the figure:
They are STK_CTRL
STK_LOAD
STK_VAL
STK_CALIB calibration, this is basically not used, or the level is not up to that level, so it is not used for the time being
2. Program Analysis
Delay_us
void Delay_us(unsigned int nTime)
{
SysTick->LOAD = 72*nTime;
SysTick->CTRL =SysTick_CTRL_ENABLE_Msk | SysTick_CTRL_CLKSOURCE_Msk;
while(!(SysTick->CTRL&SysTick_CTRL_COUNTFLAG_Msk));
SysTick->CTRL =~SysTick_CTRL_ENABLE_Msk;
}
The delay of us is completed until bit 16 is 1. Because systick is only a 24-bit counter, there is always a maximum delay, so delay ms is used to achieve more delay.
void Delay_ms(unsigned int nTime)
{
for(;nTime > 0;nTime--)
Delay_us(1000);
}
The above can achieve delay and the test is effective
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