STM32 Getting Started with SysTick System Timer (STM32F030F4P6 based on CooCox IDE)-EEWORLD

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#include "stm32_lib/inc/stm32f0xx_misc.h"

#include "stm32_lib/inc/stm32f0xx_rcc.h"

int main(void){

//Configure the initial value, the system timer is a countdown timer, minus 1

//Note: Although the parameter type of this function is uinit32_t, the actual maximum value is 16777215, which is 2^24

SysTick_Config(SystemCoreClock/10);

while(1);

}

//Interrupt function

void SysTick_Handler(void){

//Do what you want here

}

System timer, it's that simple! The clock is the system clock, just configure the countdown number.

Please note that the effective value of the counter is 24 bits. If you set it to SystemCoreClock/2, you will be in trouble!

看图 if (ticks > SysTick_LOAD_RELOAD_Msk) return (1);

What is SysTick_LOAD_RELOAD_Msk? 0xFFFFFFUL << 0. Got it!

By the way, interrupts do not need to be configured by the user because the system has configured them for you.

What's so good about this system clock?

Personally, I only think of using it for flashing various LEDs. I throw the flashing task to SysTick_Handler, and the main program can do whatever it wants.

Keywords：STM32 Reference address：STM32 Getting Started with SysTick System Timer (STM32F030F4P6 based on CooCox IDE)

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