DA转换输出正弦波，三角波，锯齿波，方波，附件资料有详细程序，仿真图。
![DVO%R(Z84)H9QVDQ)A(]X@9.png](http://c.51hei.com/d/forum/201801/03/123011szk5bg60bdf7zh7b.png "DVO%R(Z84)H9QVDQ)A(]X@9.png")
![AZF4@$GKU_UI7MBNGK~1]0J.png](http://c.51hei.com/d/forum/201801/03/123359thl17dmc68manv7h.png "AZF4@$GKU_UI7MBNGK~1]0J.png")
单片机源程序如下:
- #include<reg52.h>
- #include<absacc.h>
- #define DAC0832 XBYTE[0X7FFF]
- #define uchar unsigned char
- uchar key,Keyoff;
- uchar code sine[]={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,
- 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,
- 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 delayms(int z)
- {
- int x;
- for(;z>0;z--)
- for(x=110;x>0;x--);
- }
- void waveform()
- {
- uchar i,a,b,c=0;
- P1=0xff;
- key = P1;
- if(key!=0xff)
- {
- delayms(2);
- LOOP:if(P1!=0xff) //检测按键释放
- goto LOOP;
- }
- switch(key)
- {
- case 0xef:{while(!c){DAC0832=0x00;delayms(50);DAC0832=0xff;delayms(50);if(P1!=0xff){c=1;}}}break;
- case 0xdf:{while(!c){DAC0832=i;delayms(2);++i;if(P1!=0xff){c=1;}}}break;
- case 0xbf:{while(!c){while(a!=0xff){DAC0832=a;delayms(2);++a;}while(a!=0){DAC0832=a;delayms(2);--a;}if(P1!=0xff){c=1;}}}break;
- case 0x7f:{while(!c){for(b=0;b<255;b++){DAC0832=sine[b];}if(P1!=0xff){c=1;}}}break;
- ……………………
- …………限于本文篇幅 余下代码请从51黑下载附件…………
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