boxing.c

简易信号发生器

#include <reg51.h>						  
#include <intrins.h>							  
 											                                            					
#define uint unsigned int										   
#define uchar unsigned char					 		 
#define dataout P0											
														  
void delay1ms(unsigned char ms);								   
uchar sin=0, flage1=3,j=0,flage2=0;                       //0---方波；1---锯齿波；2---三角波；3---正弦波
static uint k=0;
static vdata=122;
//=============正弦波数据表====================
uchar code sin_tab[256]=
{
0x80, 0x83, 0x86, 0x89, 0x8c, 0x8f, 0x92, 0x95, 0x98, 0x9c, 0x9f, 0xa2, 0xa5, 0xa8, 0xab, 0xae,
0xb0, 0xb3, 0xb6, 0xb9, 0xbc, 0xbf, 0xc1, 0xc4, 0xc7, 0xc9, 0xcc, 0xce, 0xd1, 0xd3, 0xd5, 0xd8,
0xda, 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xed, 0xef, 0xf0, 0xf2, 0xf3, 0xf4,
0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xfe, 0xfd, 0xfc, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8, 0xf7,
0xf6, 0xf5, 0xf3, 0xf2, 0xf0, 0xef, 0xed, 0xec, 0xea, 0xe8, 0xe6, 0xe4, 0xe3, 0xe1, 0xde, 0xdc,
0xda, 0xd8, 0xd6, 0xd3, 0xd1, 0xce, 0xcc, 0xc9, 0xc7, 0xc4, 0xc1, 0xbf, 0xbc, 0xb9, 0xb6, 0xb4,
0xb1, 0xae, 0xab, 0xa8, 0xa5, 0xa2, 0x9f, 0x9c, 0x99, 0x96, 0x92, 0x8f, 0x8c, 0x89, 0x86, 0x83,
0x80, 0x7d, 0x79, 0x76, 0x73, 0x70, 0x6d, 0x6a, 0x67, 0x64, 0x61, 0x5e, 0x5b, 0x58, 0x55, 0x52,
0x4f, 0x4c, 0x49, 0x46, 0x43, 0x41, 0x3e, 0x3b, 0x39, 0x36, 0x33, 0x31, 0x2e, 0x2c, 0x2a, 0x27,
0x25, 0x23, 0x21, 0x1f, 0x1d, 0x1b, 0x19, 0x17, 0x15, 0x14, 0x12, 0x10, 0xf,  0xd,  0xc,  0xb ,
0x9,  0x8,  0x7,  0x6,  0x5,  0x4,  0x3,  0x3,  0x2,  0x1,  0x1,  0x0,  0x0,  0x0,  0x0,  0x0 ,
0x0,  0x0,  0x0,  0x0,  0x0,  0x0,  0x1,  0x1,  0x2,  0x3,  0x3,  0x4,  0x5,  0x6,  0x7,  0x8 ,
0x9,  0xa,  0xc,  0xd,  0xe,  0x10, 0x12, 0x13, 0x15, 0x17, 0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x23,
0x25, 0x27, 0x29, 0x2c, 0x2e, 0x30, 0x33, 0x35, 0x38, 0x3b, 0x3d, 0x40, 0x43, 0x46, 0x48, 0x4b,
0x4e, 0x51, 0x54, 0x57, 0x5a, 0x5d, 0x60, 0x63, 0x66, 0x69, 0x6c, 0x6f, 0x73, 0x76, 0x79, 0x7c,
};

void delay_ms(uint ms)
{										
	while(ms--)
	{
       _nop_();
	   _nop_();
    }
}
 void covert();
//===============================================================
void main()
{  
    TCON=0x01;
	EA=1;
	EX0=1;
	P1=0xff;
	while(1)
	{
	covert();
	}
}

void covert()
{
 switch(flage1)
 {
  case 0:dataout=255;delay_ms(k);dataout=0;delay_ms(k);	break;     //方波
  case 1:dataout=j++;delay_ms(k);						break;	   //锯齿波
  case 2:{														   
          switch(flage2)										   //三角波
  			{
			 case 0:dataout=j++;delay_ms(k);if(j==255) flage2=1; break;
			 case 1:dataout=j--;delay_ms(k);if(j==0)   flage2=0; break;
			 default:return;
			}
         }												break;	   
  case 3: dataout=sin_tab[sin++];   delay_ms( k);		break;	           //正弦波
  default:return;
 }

}

void int0() interrupt 0
{
  EX0=0;
  delay_ms(1);
  if((P1&0x01)==0) 
   {
   flage1++;
   if(flage1==4) flage1=0;
   }
  else if((P1&0x02)==0)						   // 频率加
           { k--;
		     if(k==0) return;
        	}				                       
  else if((P1&0x04)==0)	k++;				   // 频率减
	 else if((P1&0x08)==0)	  vdata+=8;		   //幅度加
	    else if((P1&0x10)==0)	vdata-=8;	   //幅度减
  P2=vdata;				   
 EX0=1;
}