NVIC: Reconfigure the Systick count

it is possible to change the Systick interrupt priority and the period of the interrupt, but this is not recommended because several drivers make use of the 1ms period of time

#include "bsp.h"

int main(void)
{
    /*seed variable to track the last time we check the systick count*/
    uint32_t tickstart;
    
    /*Init library and the systick timer*/
    HAL_Init();
    
    /*set the new tick frequency to 10ms*/
    HAL_SYSTICK_Config( SystemCoreClock / (1000u / HAL_TICK_FREQ_100HZ );
    /*set priority to the lowest level*/
    HAL_NVIC_SetPriority( SysTick_IRQn, 2u, 0u );          
    
    /*get the current tick for the first time*/
    tickstart = HAL_GetTick();      

    while (1)
    {
        /* query if already pass 200ms (ticks) since we got the current tick value*/
        if( (HAL_GetTick() - tickstart) >= 20 )
        {
            /*at this point 200ms has been elapsed and we need to take the current tick count again*/
            tickstart = HAL_GetTick();
            
            /*we do anything we want here and every 200ms */        
        }
    }
}

ints.c

/*To track the tick count we need to call the function HAL_IncTick on the vector interrupt*/
void SysTick_Handler( void )
{
    HAL_IncTick( );
}