STM32 - systick timer (cubemx configures systick)

SysTick The system timer belongs to Cortex-M A peripheral in the kernel , Embedded in NVIC in

SysTick The system timer contains a counting width of 24bit The downward decreasing automatic reload counter , The counter counts every time for 1/CLKSource, Generally we set CLKSource For the system clock , With F103 For example ,CLKSource Can be configured as 72MHz

        Count width : 24bit To store data , Can be stored 2^24 Power data

         Decreasing downward ： It refers to the working mode of the counter

        Work cycle ：1/72MHz

When the value of the reload value register is decremented to 0 When ,SysTick The system timer can be configured to generate an interrupt , And so on

SysTick The system timer belongs to Cortex-M Peripherals of kernel , So it is generally based on Cortex-M All the single chip microcomputers in the kernel have this system timer , This makes the software in Cortex-M MCU can be easily transplanted

SysTick Function of timer ：

（1）SysTick The system timer can be used to operate the system , Used to generate time bases , Maintain the heartbeat of the operating system , General operating systems require a time base , Electroplate the task , Synchronization and other functions

（2）SysTick The most commonly used function of the system timer is Count , For example, it is used for microseconds , Millisecond delay ,ui This produces a specific timing

SysTick Register summary

Register name	describe
CTRL	SysTick Control and status register
LOAD	SysTick Reload the load value register
VAL	SysTick Current value register
CALIB	SysTick Calibration value register

 

 CubeMX To configure SysTick

1. Configure the system clock

 2. Set up SysTick

Here we are ,SysTick The setting is finished