delay.c

#include "stm32f1xx_hal.h"
#include "delay.h"
static unsigned int fac_us = 0;
void SysTick_Handler(void){
    HAL_IncTick();
    //HAL_SYSTICK_IRQHandler();
}
void delay_init(unsigned int sysclk){
    HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
    fac_us = sysclk;
    //NVIC_DisableIRQ(SysTick_IRQn);
}
void delay_us(unsigned int nus){
    unsigned int ticks, told, tnow, tcnt = 0;
    ticks = nus * fac_us;
    told = SysTick->VAL;
    for(;;){
        tnow = SysTick->VAL;
        if(tnow != told){
            if(tnow < told)tcnt += told - tnow;
            else tcnt += ((SysTick->LOAD) - tnow + told);
            told = tnow;
            if(tcnt >= ticks)break;
        }
    }
}
void delay_ms(unsigned short nms){
    unsigned short i;
    for(i = 0;i < nms;i++){
        delay_us(1000);
    }
}