单片机实训实验报告（信号发生器） .zip

#include <reg51.h> #define uchar unsigned char #define uint unsigned int uchar code table[]={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,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,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,0x80}; //正弦波一个周期的采样值 uchar read_p2(); uchar read_p3(); void delayus(uchar z) //延时 { uchar i,j; for(i=z;i>0;i--) for(j=10;j>0;j--); } void zhengxian() //正弦波产生 { uchar i; P0=table[i]; delayus(read_p2( )); i+=1; if(i==255) i=0; P1=0XF7; //接P1.3管脚的LED灯点亮，指示现在是输出正弦波状态 } void fangbo() //方波 { uchar i; i+=1; if(i==255) i=0; if(i<128) { P0=0x00; } else { P0=0xff; } delayus(read_p2()); //接P2口开关状态决定延时时间进而改变信号的频率 P1=0x0e; //接P1.0管脚的LED灯点亮，指示现在输出方波 } void sanjiao() //三角波 { uchar i; if(i<128) { P0=i; } else P0=255-i; delayus(read_p2( )); i+=1; if(i==255) i=0; P1=0x0b; //接P1.2管脚的LED灯点亮，指示现在是输出三角波状态 } void juchi() //锯齿波 { P0+=1; delayus(read_p2()); //接P2口开关状态决定延时时间进而改变信号的频率 if(P0>=255) P0=0; P1=0x0d; //接P1.1管脚的LED灯点亮，指示现在是输出锯齿波状态 } uchar read_p3( ) //波形选择 { uchar value; value=(P3&0xf0)>>4; return(value); } uchar read_p2( ) //频率大小 { uchar value; value=P2; return(value); } void main() //主函数 { P0=0; P1=0; while(1) { switch (read_p3()) { case 0x0e:fangbo();break; //拨码开关K1闭合，输出方波 case 0x0d:juchi();break; //拨码开关K2闭合，输出锯齿波 case 0x0b:sanjiao();break; //拨码开关K3闭合，输出三角波 case 0x07:zhengxian();break; //拨码开关K3闭合，输出正弦波 default:{P1=0;}break; } } }