0904_BOOT/BSP/systick.c

#include "systick.h"
#include "includes.h"

void SysTick_init(void)
{
	 /* setup systick timer for 1000Hz interrupts */
    if (SysTick_Config(SystemCoreClock / 1000U)){
        /* capture error */
        while(1){
        }
    }
    /* configure the systick handler priority */
    NVIC_SetPriority(SysTick_IRQn, 0x00U);
}

/**
  * @brief  This function handles SysTick Handler.
  * @param  None
  * @retval None
  */
volatile uint32_t TickCounter;
volatile uint64_t TickCounter_u64;
void SysTick_Handler(void)
{

	TickCounter++;
	TickCounter_u64++;
	
//	USART_ReceiveOvertimeProcess();
}