delay.c

基于MFRC500读卡芯片的完整读卡程序

/*-------------------------------------------------------------------------
//delay.c
//延时与定时函数库
---------------------------------------------------------------------------*/
#include "main.h"
#include <intrins.h>
//---------------------------------------------------------------------------
void delay_1us(void)                 //1us延时函数
  {
	_nop_();
  }
 
void delay_nus(unsigned int n)       //N us延时函数
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1us();
  }

void delay_1ms(void)                 //1ms延时函数
  {
       unsigned int i;
       for (i=0;i<1140;i++);
  }

void delay_nms(unsigned int n)       //N ms延时函数
{
	unsigned int i=0;
	for (i=0;i<n;i++)
	delay_1ms();
 }

/*------------------------------------------------------------------
Init Timer 0 
--------------------------------------------------------------------*/
/*void Init_T0(void)   
   {
 
   TMOD &= 0xF0;        // Clear all T0 bits (T1 left unchanged)
   TMOD |= 0x01;        // Set required T0 bits (T1 left unchanged)方式1 
                   
   TH0 = PRELOAD01H;     
   TL0 = PRELOAD01L;   

   TF0 = 0;          // clear overflow flag
   TR0 = 0;          // stop timer 0

    
   ET0=1;
   EA=1;
                     // 允许定时器0中断
   }*/       

/*------------------------------------------------------------------*
---- END OF FILE -------------------------------------------------*/