- #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}; //正弦波一個(gè)周期的采樣值
- uchar read_p2();
- uchar read_p3();
- void delayus(uchar z) //延時(shí)
- {
- uchar i,j;
- for(i=z;i>0;i--)
- for(j=10;j>0;j--);
- }
- void pro_sinware() //正弦波產(chǎn)生
- {
- uchar i;
- P0=table[i];
- delayus(read_p2( ));
- i+=1;
- if(i==255)
- i=0;
- P1=0XF7; //接P1.3管腳的LED燈點(diǎn)亮，指示現(xiàn)在是輸出正弦波狀態(tài)
- }
- void pro_square() //方波
- {
- uchar i;
- i+=1;
- if(i==255) i=0;
- if(i<128)
- {
- P0=0x00;
- }
- else
- {
- P0=0xff;
- }
- delayus(read_p2()); //接P2口開關(guān)狀態(tài)決定延時(shí)時(shí)間進(jìn)而改變信號的頻率
- P1=0x0e; //接P1.0管腳的LED燈點(diǎn)亮，指示現(xiàn)在輸出方波
- }
- void pro_triangle() //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管腳的LED燈點(diǎn)亮，指示現(xiàn)在是輸出三角波狀態(tài)
- }
- void pro_sawtooth() //鋸齒波
- {
- P0+=1;
- delayus(read_p2()); //接P2口開關(guān)狀態(tài)決定延時(shí)時(shí)間進(jìn)而改變信號的頻率
- if(P0>=255) P0=0;
- P1=0x0d; //接P1.1管腳的LED燈點(diǎn)亮，指示現(xiàn)在是輸出鋸齒波狀態(tài)
- }
- uchar read_p3( ) //接P3口開關(guān)的鍵值處理函數(shù)
- {
- uchar value;
- value=(P3&0xf0)>>4;
- return(value);
- }
- uchar read_p2( ) //接P2口開關(guān)的鍵值處理函數(shù)
- {
- uchar value;
- value=P2;
- return(value);
- }
- void main() //主函數(shù)
- {
- P0=0;
- P1=0;
- while(1)
- {
- switch (read_p3())
- {
- case 0x0e:pro_square();break; //撥碼開關(guān)K1閉合，輸出方波
- case 0x0d:pro_sawtooth();break; //撥碼開關(guān)K2閉合，輸出鋸齒波
- case 0x0b:pro_triangle();break; //撥碼開關(guān)K3閉合，輸出三角波
- case 0x07:pro_sinware();break; //撥碼開關(guān)K3閉合，輸出正弦波
- default:{P1=0;}break;
- }
- }
- }
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