仿真图:
波形发生器的制作
单片机代码:
- #include<reg51.h>
- sbit wr=P3^6;
- sbit rd=P3^2;
- sbit key0=P1^0;
- sbit key1=P1^1;
- sbit key2=P1^2;
- sbit key3=P1^3;
- sbit key4=P1^4;
- unsigned char flag;
- unsigned char const code
- SIN_code[256]={
- 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};
- unsigned char keyscan()
- {
- unsigned char keyscan_num,temp;
- P1=0xff;
- temp=P1;
- if(~(temp&0xff))
- {
- if(key0==0)
- {
- keyscan_num=1;
- }
- else if(key1==0)
- {
- keyscan_num=2;
- }
- else if(key2==0)
- {
- keyscan_num=3;
- }
- else if(key3==0)
- {
- keyscan_num=4;
- }
- else if(key4==0)
- {
- keyscan_num=5;
- }
- else
- {
- keyscan_num=0;
- }
- return keyscan_num;
- }
- }
- void init_DA0832()
- {
- rd=0;
- wr=0;
- }
- void SIN()
- {
- unsigned int i;
- do{
- P2=SIN_code[i];
- i=i+1;
- }while(i<256);
- }
- void Square()
- {
- EA=1;
- ET0=1;
- TMOD=1;
- TH0=0xff;
- TL0=0x83;
- TR0=1;
- }
- void Triangle ()
- {
- P2=0x00;
- do{
- P2=P2+1;
- }while(P2<0xff);
- P2=0xff;
- do{
- P2=P2-1;
- }while(P2>0x00);
- P2=0x00;
- }
- void Sawtooth ()
- {
- P2=0x00;
- do{
- P2=P2+1;
- }while(P2<0xff);
- }
- void Trapezoidal ()
- {
- unsigned char i;
- P2=0x00;
- do{
- P2=P2+1;
- }while(P2<0xff);
- P2=0xff;
- for(i=255;i>0;i--)
- {
- P2=0xff;
- }
- do{
- P2=P2-1;
- }while(P2>0x00);
- P2=0x00;
- }
- void main()
- {
- init_DA0832();
- do
- {
- flag=keyscan();
- }while(!flag);
- while(1)
- {
- switch(flag)
- {
- case 1:
- do{
- flag=keyscan();
- SIN();
- }
- while(flag==1);
- break;
- case 2:
- Square ();
- do{
- flag=keyscan();
- }while(flag==2);
- TR0=0;
- break;
- case 3:
- do{
- flag=keyscan();
- Triangle ();
- }while(flag==3);
- break;
- case 4:
- do{
- flag=keyscan();
- Trapezoidal ();
- }while(flag==4);
- break;
- case 5:
- do{
- flag=keyscan();
- Sawtooth ();
- }while(flag==5);
- break;
- default:
- flag=keyscan();
- break;
- }
- }
- }
- void timer0(void) interrupt 1
- {
- P2=~P2;
- TH0=0xff;
- TL0=0x83;
- TR0=1;
- }
复制代码 全部资料51hei下载地址:
例题11-2.zip
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