- #include <reg51.h>
- #define DAC P0
- sbit CS1=P2^0;
- sbit WRR=P3^6;
- static unsigned char code TableSin[256]={
- 128,131,134,137,140,143,146,149,152,155,158,162,165,167,170,173,
- 176,179,182,185,188,190,193,196,198,201,203,206,208,211,213,215,
- 218,220,222,224,226,228,230,232,234,235,237,238,240,241,243,244,
- 245,246,248,249,250,250,251,252,253,253,254,254,254,255,255,255,
- 255,255,255,255,254,254,254,253,253,252,251,250,250,249,248,246,
- 245,244,243,241,240,238,237,235,234,232,230,228,226,224,222,220,
- 218,215,213,211,208,206,203,201,198,196,193,190,188,185,182,179,
- 176,173,170,167,165,162,158,155,152,149,146,143,140,137,134,131,
- 127,124,121,118,115,112,109,106,103,100, 97, 93, 90, 88, 85, 82,
- 79, 76, 73, 70, 67, 65, 62, 59, 57, 54, 52, 49, 47, 44, 42, 40,
- 37, 35, 33, 31, 29, 27, 25, 23, 21, 20, 18, 17, 15, 14, 12, 11,
- 10, 9, 7, 6, 5, 5, 4, 3, 2, 2, 1, 1, 1, 0, 0, 0,
- 0, 0, 0, 0, 1, 1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 9,
- 10, 11, 12, 14, 15, 17, 18, 20, 21, 23, 25, 27, 29, 31, 33, 35,
- 37, 40, 42, 44, 47, 49, 52, 54, 57, 59, 62, 65, 67, 70, 73, 76,
- 79, 82, 85, 88, 90, 93, 97,100,103,106,109,112,115,118,121,124
- };
- unsigned char i;
- unsigned char num=1;
- void tran();
- void sin();
- void puls();
- void delay(unsigned char);
- void init();
- void main()
- {
- CS1=0;
- WRR=0;
- init();
- while(1)
- {
- switch(num)
- {
- case 1:sin();break;
- case 2:puls(); break;
- case 3:tran();break;
- }
- }
- }
- void wave_t() interrupt 0
- {
- delay(100);
- num++;
- if(num>3)num=1;
- }
- void delay(unsigned char i)
- {
- while(i--);
- }
- void sin()
- {
- for(i=0;i<254;i++)
- {
- DAC=TableSin[i];
- delay(3);
- }
- }
- void tran()
- {
- unsigned char i;
- for(i=0;i<254;i+=2)
- {
- DAC=i;
- delay(2);
- }
- for(i=254;i>=1;i-=2)
- {
- DAC=i;
- delay(2);
- }
- }
- void puls()
- {
- DAC=0xff;
- delay(1000);
- DAC=0x00;
- delay(1000);
- }
- void init()
- {
- IT0=1;
- EX0=1;
- EA=1;
- }
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