程序如下：
電路如圖；
問題就是為什么會失真那么大，除了方波之外，正弦，三角都有問題，請大家幫忙看看
電路
三角
正弦
單片機源程序如下:
- #include<reg51.h>
- #include <absacc.h>
- #define uint unsigned int
- #define uchar unsigned char
- void daly3();
- void daly2();
- void daly1();
- void delay39us();
- void delay10ms();
- int k;
- uchar code sin[]={0x80,0x83,0x86,0x89,0x8D,0x90,0x93,0x96,0x99,0x9C,0x9F,0xA2,0xA5,0xA8,0xAB,0xAE,
- 0xB1,0xB4,0xB7,0xBA,0xBC,0xBF,0xC2,0xC5,0xC7,0xCA,0xCC,0xCF,0xD1,0xD4,0xD6,0xD8,
- 0xDA,0xDD,0xDF,0xE1,0xE3,0xE5,0xE7,0xE9,0xEA,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4,0xF5,
- 0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFD,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
- 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFD,0xFC,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6,
- 0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEA,0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,0xDD,0xDA,
- 0xD8,0xD6,0xD4,0xD1,0xCF,0xCC,0xCA,0xC7,0xC5,0xC2,0xBF,0xBC,0xBA,0xB7,0xB4,0xB1,
- 0xAE,0xAB,0xA8,0xA5,0xA2,0x9F,0x9C,0x99,0x96,0x93,0x90,0x8D,0x89,0x86,0x83,0x80,
- 0x80,0x7C,0x79,0x76,0x72,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x55,0x51,
- 0x4E,0x4C,0x48,0x45,0x43,0x40,0x3D,0x3A,0x38,0x35,0x33,0x30,0x2E,0x2B,0x29,0x27,
- 0x25,0x22,0x20,0x1E,0x1C,0x1A,0x18,0x16,0x15,0x13,0x11,0x10,0x0E,0x0D,0x0B,0x0A,
- 0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
- 0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,
- 0x0A,0x0B,0x0D,0x0E,0x10,0x11,0x13,0x15,0x16,0x18,0x1A,0x1C,0x1E,0x20,0x22,0x25,
- 0x27,0x29,0x2B,0x2E,0x30,0x33,0x35,0x38,0x3A,0x3D,0x40,0x43,0x45,0x48,0x4C,0x4E,
- 0x51,0x55,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x72,0x76,0x79,0x7C,0x7E};
- void delay(uchar t)
- {
- while(t--);
- }
- void zheng()
- {
- uint i;
- for(i=0;i<=255;i++)
- {
- P1=sin[i];
- delay39us();
- }
- }
- void fang()
- {
- P1=0;
- delay15ms();
- P1=0xff;
- delay15ms();
- }
- void sanjiao()
- { uint i;
- for(i=0;i<255;i++)
- {
- P1=i;
- daly2();
- }
- for(i=255;i>0;i--)
- {
- P1=i;
- daly2();
- }
- }
- void key()
- {
- P0=0xf0;
- if(P0==0xe0)
- {delay(100);
- if(P0==0xe0)
- k=1;
- }
- else if(P0==0xd0)
- {delay(100);
- if(P0==0xd0)
- k=2;
- }
- else if(P0==0xb0)
- {delay(100);
- if(P0==0xb0)
- k=3;
- }
- else k=0;
- }
- void main()
- {
- while(1)
- {
- key();
- if(k==1)
- while(1)
- {
- zheng();
- key();
- if(k!=0)
- break;
- }
- else if(k==2)
- while(1)
- {
- fang();
- key();
- if(k!=0)
- break;
- }
- else if(k==3)
- while(1)
- {
- sanjiao();
- key();
- if(k!=0)
- break;
- }
- }
- }
- void daly1()
- {
- {
- unsigned char a,b,c;
- for(a=0;a<5;a++)
- for(b=0;b<10;b++)
- for(c=0;c<220;c++);
- }
- }
- void daly2()
- {
- unsigned char a;
- for(a=10;a>0;a--);
- }
- void daly3()
- {
- unsigned char a;
- for(a=200;a>0;a--);
- }
- void delay39us(void)
- {
- unsigned char a;
- for(a=9;a>0;a--);
- }
- void delay10ms(void)
- {
- unsigned char a,b,c;
- for(c=5;c>0;c--)
- for(b=4;b>0;b--)
- for(a=248;a>0;a--);
- }
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