delay.c

来自「一个AVR单片机的学习程序」· C语言 代码 · 共 33 行

#include "delay.H"
#define XTAL 4

void delay_1us(void)
{
 asm("nop");
 asm("nop");
 asm("nop");
 asm("nop");
}

void delay_nus(unsigned int n)
{
 unsigned int i;
 
 for(i=0;i<n;i++)
  delay_1us( );
}

void delay_1ms(void)
{
 unsigned int i;
 for(i=0;i<(unsigned int)(XTAL*250-4);i++);
}

void delay_nms(unsigned int n)
{
 unsigned int i;
 
 for(i=0;i<n;i++)
  delay_1ms( );
}