//基于AT89C52的简单函数发生器的设计#include
#include
#define DAC0832 XBYTE[0x0fff]
float code table2[]={ 0x80,0x83,0x85,0x88,0x8A,0x8D,0x8F,0x92, 0x94,0x97,0x99,0x9B,0x9E,0xA0,0xA3,0xA5, 0xA7,0xAA,0xAC,0xAE,0xB1,0xB3,0xB5,0xB7, 0xB9,0xBB,0xBD,0xBF,0xC1,0xC3,0xC5,0xC7, 0xC9,0xCB,0xCC,0xCE,0xD0,0xD1,0xD3,0xD4, 0xD6,0xD7,0xD8,0xDA,0xDB,0xDC,0xDD,0xDE, 0xDF,0xE0,0xE1,0xE2,0xE3,0xE3,0xE4,0xE4, 0xE5,0xE5,0xE6,0xE6,0xE7,0xE7,0xE7,0xE7, 0xE7,0xE7,0xE7,0xE7,0xE6,0xE6,0xE5,0xE5, 0xE4,0xE4,0xE3,0xE3,0xE2,0xE1,0xE0,0xDF, 0xDE,0xDD,0xDC,0xDB,0xDA,0xD8,0xD7,0xD6, 0xD4,0xD3,0xD1,0xD0,0xCE,0xCC,0xCB,0xC9, 0xC7,0xC5,0xC3,0xC1,0xBF,0xBD,0xBB,0xB9, 0xB7,0xB5,0xB3,0xB1,0xAE,0xAC,0xAA,0xA7, 0xA5,0xA3,0xA0,0x9E,0x9B,0x99,0x97,0x94, 0x92,0x8F,0x8D,0x8A,0x88,0x85,0x83,0x80, 0x7D,0x7B,0x78,0x76,0x73,0x71,0x6E,0x6C, 0x69,0x67,0x65,0x62,0x60,0x5D,0x5B,0x59, 0x56,0x54,0x52,0x4F,0x4D,0x4B,0x49,0x47, 0x45,0x43,0x41,0x3F,0x3D,0x3B,0x39,0x37, 0x35,0x34,0x32,0x30,0x2F,0x2D,0x2C,0x2A, 0x29,0x28,0x26,0x25,0x24,0x23,0x22,0x21, 0x20,0x1F,0x1E,0x1D,0x1D,0x1C,0x1C,0x1B, 0x1B,0x1A,0x1A,0x1A,0x19,0x19,0x19,0x19, 0x19,0x19,0x19,0x19,0x1A,0x1A,0x1A,0x1B, 0x1B,0x1C,0x1C,0x1D,0x1D,0x1E,0x1F,0x20, 0x21,0x22,0x23,0x24,0x25,0x26,0x28,0x29, 0x2A,0x2C,0x2D,0x2F,0x30,0x32,0x34,0x35, 0x37,0x39,0x3B,0x3D,0x3F,0x41,0x43,0x45, 0x47,0x49,0x4B,0x4D,0x4F,0x52,0x54,0x56, 0x59,0x5B,0x5D,0x60,0x62,0x65,0x67,0x69, 0x6C,0x6E,0x71,0x73,0x76,0x78,0x7B,0x7D};
void delay(unsigned int i)//延时函数{ while(i--);}
void fang()//方波{ DAC0832=0; delay(15);
DAC0832=0xff; delay(15); }
void jvchi()//锯齿波{ unsigned char i; for(i=0;i<255;i++) { DAC0832=i; // delay(10); } }
void tran()//三角波{ unsigned char i; for(i=0;i<255;i++) { DAC0832=i; // delay(10); } for(i=255;i>0;i--) { DAC0832=i; // delay(10); }}
void sin()//正弦波{ unsigned int i; for(i=0;i<256;i++) { DAC0832=table2[i]; // delay(10); }
}
void main(void)//主函数{ while(1) { if(P1==0xfe)fang(); if(P1==0xfd)jvchi(); if(P1==0xfb)tran(); if(P1==0xf7)sin(); if(P1==0xff)DAC0832=0; } }