"As mentioned in the previous article, when using peripheral functions, you must carefully initialize them in advance to use their functions.
The following is a list of procedures for initializing the system timer.
#include“stm32f10x_ lib.h”
unsigned char sys_ nub;// System timer interrupt count variable
//Systick settings
void SysTIck_ Config（void）
{
//Disable systick timer
SysTIck_ CounterCmd（SysTIck_ Counter_ Disable）;
//Disable systick interrupt
SysTick_ ITConfig（DISABLE）;
//Set systick clock source
SysTick_ ClockSourceConfig（SysTick_ Source_ HCLK_ Div8）;
//Set the overload value, overload once in 10ms, under the 72mhz clock
SysTick_ Reload（90000）;
//Open interrupt
SysTick_ ITconfig（ENABLE）;
//On timer
SysTick_ CounterCmd（SysTick_ Counter_ Enable）;
}, read the full text, technical section
Correct use method and precautions of ssp1 pin based on lpc1788
Initialization setting of system timer of STM32 single chip microcomputer
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