Systick is just a timer, but it is put in NVIC. Its main purpose is to provide a hardware interrupt (known as a tick interrupt) to the operating system. Tick break? Here is a brief explanation. When the operating system is running, there will be a "heartbeat". It will work according to the beat of "heartbeat" and divide the whole time period into many small time slices. Each task can only run one time slice, so it has to quit to other tasks to run, so as to ensure that no task will occupy the whole system. Or give a certain time range of each timer cycle to a specific task, and various timing functions provided by the operating system are related to the tick timer. Therefore, a timer is needed to generate periodic interrupts, and it is better to keep the operating system "heartbeat" rhythm by preventing the user program from accessing its registers at will. As long as the enable bit in systick control and status register is not cleared, it will never stop.

Filename	Size	Update
7.滴答定时器实验\SysTick_Ex\cmsis\Include\arm_common_tables.h	4676	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\arm_const_structs.h	3666	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\arm_math.h	242444	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\core_cm0.h	33042	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\core_cm0plus.h	40429	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\core_cm3.h	99832	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\core_cm4.h	109142	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\core_cm4_simd.h	22735	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\core_cmFunc.h	17146	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\core_cmInstr.h	20513	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\core_sc000.h	41744	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\core_sc300.h	98211	2014-07-17
7.滴答定时器实验\SysTick_Ex\cmsis\Include\stm32f4xx.h	704095	2014-08-01
7.滴答定时器实验\SysTick_Ex\cmsis\Include\system_stm32f4xx.h	2233	2014-08-01
7.滴答定时器实验\SysTick_Ex\cmsis\startup_stm32f40_41xxx.s	29605	2014-08-02
7.滴答定时器实验\SysTick_Ex\cmsis\system_stm32f4xx.c	47782	2014-08-02
7.滴答定时器实验\SysTick_Ex\DebugConfig\stm32f4xx_project_STM32F407VG.dbgconf	2084	2015-10-27
7.滴答定时器实验\SysTick_Ex\DebugConfig\stm32f4xx_project_STM32F407ZGTx.dbgconf	2851	2017-11-21
7.滴答定时器实验\SysTick_Ex\DebugConfig\Target_1_STM32F407ZGTx.dbgconf	2851	2017-11-21
7.滴答定时器实验\SysTick_Ex\EventRecorderStub.scvd	339	2018-08-03
7.滴答定时器实验\SysTick_Ex\Listings\startup_stm32f40_41xxx.lst	76066	2019-03-29
7.滴答定时器实验\SysTick_Ex\Listings\stm32f4xx_project.map	35479	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\beep.crf	262028	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\beep.d	432	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\beep.o	279452	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\ExtDll.iex	19	2018-08-03
7.滴答定时器实验\SysTick_Ex\Objects\exti.crf	263294	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\exti.d	504	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\exti.o	291952	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\key.crf	262928	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\key.d	421	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\key.o	282984	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\led.crf	262678	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\led.d	421	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\led.o	279740	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\main.crf	269335	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\main.d	744	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\main.o	287876	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\startup_stm32f40_41xxx.d	68	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\startup_stm32f40_41xxx.o	7932	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\stm32f4xx_project.axf	317956	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\stm32f4xx_project.build_log.htm	2065	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\stm32f4xx_project.hex	7881	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\stm32f4xx_project.htm	41239	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\stm32f4xx_project.lnp	537	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\stm32f4xx_project.sct	540	2018-09-04
7.滴答定时器实验\SysTick_Ex\Objects\stm32f4xx_project_sct.Bak	479	2018-07-30
7.滴答定时器实验\SysTick_Ex\Objects\stm32f4xx_project_stm32f4xx_project.dep	8049	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\system_stm32f4xx.crf	263943	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\system_stm32f4xx.d	500	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\system_stm32f4xx.o	283088	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\systick.crf	262670	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\systick.d	504	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\systick.o	284908	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\usart.crf	267800	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\usart.d	506	2019-03-29
7.滴答定时器实验\SysTick_Ex\Objects\usart.o	288732	2019-03-29
7.滴答定时器实验\SysTick_Ex\stm32f4xx_project.uvguix.Administrator	87537	2019-10-17
7.滴答定时器实验\SysTick_Ex\stm32f4xx_project.uvoptx	11827	2019-10-17
7.滴答定时器实验\SysTick_Ex\stm32f4xx_project.uvprojx	15480	2019-10-17
7.滴答定时器实验\SysTick_Ex\user\inc\beep.h	117	2018-07-31
7.滴答定时器实验\SysTick_Ex\user\inc\exti.h	103	2018-08-03
7.滴答定时器实验\SysTick_Ex\user\inc\key.h	341	2018-07-31
7.滴答定时器实验\SysTick_Ex\user\inc\led.h	132	2018-08-01
7.滴答定时器实验\SysTick_Ex\user\inc\systick.h	197	2018-08-03
7.滴答定时器实验\SysTick_Ex\user\inc\usart.h	242	2018-08-03
7.滴答定时器实验\SysTick_Ex\user\src\beep.c	640	2018-08-01
7.滴答定时器实验\SysTick_Ex\user\src\exti.c	1996	2018-08-03
7.滴答定时器实验\SysTick_Ex\user\src\key.c	1824	2018-08-01
7.滴答定时器实验\SysTick_Ex\user\src\led.c	2050	2019-03-29
7.滴答定时器实验\SysTick_Ex\user\src\main.c	939	2019-10-17
7.滴答定时器实验\SysTick_Ex\user\src\systick.c	1597	2018-08-03
7.滴答定时器实验\SysTick_Ex\user\src\usart.c	2593	2018-08-03
7.滴答定时器实验\SysTick_Ex\cmsis\Include	0	2019-08-19
7.滴答定时器实验\SysTick_Ex\user\inc	0	2019-08-19
7.滴答定时器实验\SysTick_Ex\user\src	0	2019-10-17
7.滴答定时器实验\SysTick_Ex\cmsis	0	2019-08-19
7.滴答定时器实验\SysTick_Ex\DebugConfig	0	2019-08-19
7.滴答定时器实验\SysTick_Ex\Listings	0	2019-08-19
7.滴答定时器实验\SysTick_Ex\Objects	0	2019-08-19
7.滴答定时器实验\SysTick_Ex\user	0	2019-08-19
7.滴答定时器实验\SysTick_Ex	0	2019-10-17
7.滴答定时器实验	0	2019-08-19

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