正玄波，锯齿波，频率占空比可调的矩形波。
C语言源程序+protues仿真
单片机源程序如下:
- //DA convertion
- //2018/9/24
- //Wang XY
- #include<reg52.h>
- #define unit unsigned int
- #define uchar unsigned char
- sbit key0=P1^0;
- sbit key1=P1^1;
- sbit key2=P1^2;
- /***********************************************************************************/
- uchar code sin_tab[]={
- 0x80,0x83,0x86,0x89,0x8c,0x8f,0x92,0x95,0x98,0x9c,0x9f,0xa2,
- 0xa5,0xa8,0xab,0xae,0xb0,0xb3,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,
- 0xc7,0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,0xda,0xdc,0xde,0xe0,
- 0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xed,0xef,0xf0,0xf2,0xf3,0xf4,
- 0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfc,0xfd,0xfe,0xfe,0xff,//sin 1/4
- 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfe,
- 0xfd,0xfc,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf3,0xf2,
- 0xf0,0xef,0xed,0xec,0xea,0xe8,0xe6,0xe4,0xe3,0xe1,0xde,0xdc,
- 0xda,0xd8,0xd6,0xd3,0xd1,0xce,0xcc,0xc9,0xc7,0xc4,0xc1,0xbf,
- 0xbc,0xb9,0xb6,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,
- 0x99,0x96,0x92,0x8f,0x8c,0x89,0x86,0x83,0x80,0x7d,0x79,0x76,
- 0x73,0x70,0x6d,0x6a,0x67,0x64,0x61,0x5e,0x5b,0x58,0x55,0x52,
- 0x4f,0x4c,0x49,0x46,0x43,0x41,0x3e,0x3b,0x39,0x36,0x33,0x31,
- 0x2e,0x2c,0x2a,0x27,0x25,0x23,0x21,0x1f,0x1d,0x1b,0x19,0x17,
- 0x15,0x14,0x12,0x10,0xf,0xd,0xc,0xb,0x9,0x8,0x7,0x6,0x5,0x4,
- 0x3,0x3,0x2,0x1,0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,//sin 1/2
- 0x0,0x1,0x1,0x2,0x3,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xc,0xd,
- 0xe,0x10,0x12,0x13,0x15,0x17,0x18,0x1a,0x1c,0x1e,0x20,0x23,
- 0x25,0x27,0x29,0x2c,0x2e,0x30,0x33,0x35,0x38,0x3b,0x3d,0x40,
- 0x43,0x46,0x48,0x4b,0x4e,0x51,0x54,0x57,0x5a,0x5d,0x60,0x63,
- 0x66,0x69,0x6c,0x6f,0x73,0x76,0x79,0x7c};
- /*********************************************************************/
- void DELAY(unit n)
- {
- while(n!=0)
- n--;
- }
- /********************************************/
- void SAWTOOTH_WAVE(float m,float n,float u) //整形形参，传递占空比小于等于100（默认百分之）和频率以及单位
- {
- float h,l;
- while(1)
- {
- if(key0)
- {
- if(u==1) //HZ
- {
- h=10000*m*(1/n); // T=1/n h=(m/100)*T
- l=10000*(100-m)*(1/n);
- }
- if(u==2) //khz
- {
- h=10*m*(1/n);
- l=10*(100-m)*(1/n);
- }
- if(u==3) //mhz
- {
- h=(m/100)*(1/n);
- l=((100-m)/100)*(1/n);
- }
- P2=0x00;
- DELAY(h);
- P2=0xff;
- DELAY(l);
- }
- else break;
- }
- }
- /*********************************/
- void TRIANGLE_WAVE()
- {
- uchar i=0;
- while(1)
- {
- if(key1)
- {
- for(;i<255;i++)
- P2=i; //down
- for(;i>0;i--)
- P2=i; //up
- } //f=1/T=1/256*2us≈2khz
- else break;
- }
- }
- /*******************************/
- void SIN_WAVE()
- {
- unit i;
- while(1)
- {
- if(key2)
- {
- for(i=0;i<256;i++)
- P2=sin_tab[i];
- }
- else break;
- }
- }
- /********************************/
- void main()
- {
- while(1)
- {
- SAWTOOTH_WAVE(10,2,2);
- TRIANGLE_WAVE();
- SIN_WAVE();
- }
- }
所有资料51hei提供下载:
DA转换.rar
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