显示频率，幅度可调，可产生四种波形，正弦波，方波，锯齿波，三角波，希望你能喜欢，给你发了一张效果图，喜欢的话别忘了采纳我的回答啊
#include<reg52h>
#define uchar unsigned char
#define uint unsigned int
#define DAdata P0 //DA数据端口
sbit DA_S1= P2^0; // 控制DAC0832的8位输入寄存器，仅当都为0时，可以输出数据(处于直通状态)，否则，输出将被锁存
sbit DA_S2= P2^1; // 控制DAC0832的8位DAC寄存器，仅当都为0时，可以输出数据(处于直通状态)，否则，输出将被锁存
sbit key= P3^2;
uchar wavecount; //'抽点'计数
uchar THtemp,TLtemp;//传递频率的中间变量
uchar judge=1; //在方波输出函数中用于简单判别作用
uchar waveform; //当其为0、1、2时，分别代表三种波
uchar code freq_unit[3]={10,50,200}; //三种波的频率单位
uchar idata wavefreq[3]={1,1,1}; //给每种波定义一个数组单元，用于存放单位频率的个数
uchar code lcd_hang1[]={"Sine Wave " "Triangle Wave " "Square Wave " "Select Wave: " "press No1 key! "};
uchar idata lcd_hang2[16]={"f= Hz "};
uchar code waveTH[]={
0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xec,0xf6,0xf9,0xfb,0xfc,0xfc,0xfd,0xfd,0xfd,0xfe};
uchar code waveTL[]={
0x06,0x8a,0x10,0x4e,0x78,0x93,0xa8,0xb3,0xbe,0xc6, //正弦波频率调整中间值
0xac,0xde,0x48,0x7a,0x99,0xaf,0xbb,0xc8,0xd0,0xde, //三角波频率调整中间值
0x88,0x50,0x90,0x32,0x34,0xbe,0x4a,0xa3,0xe5,0x2c};
//
uchar code triangle_tab[]={ //每隔数字8，采取一次
0x00,0x08,0x10,0x18,0x20,0x28,0x30,0x38,0x40,0x48,0x50,0x58,0x60,0x68,0x70,0x78,
0x80,0x88,0x90,0x98,0xa0,0xa8,0xb0,0xb8,0xc0,0xc8,0xd0,0xd8,0xe0,0xe8,0xf0,0xf8,0xff,
0xf8,0xf0,0xe8,0xe0,0xd8,0xd0,0xc8,0xc0,0xb8,0xb0,0xa8,0xa0,0x98,0x90,0x88,0x80,
0x78,0x70,0x68,0x60,0x58,0x50,0x48,0x40,0x38,0x30,0x28,0x20,0x18,0x10,0x08,0x00};
uchar code sine_tab[256]={
//输出电压从0到最大值（正弦波1/4部分）
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,
//输出电压从最大值到0（正弦波1/4部分）
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,
//输出电压从0到最小值（正弦波1/4部分）
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,0,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
//输出电压从最小值到0（正弦波1/4部分）
0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02 ,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0,0x0b,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};
void delay(uchar z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void triangle_out() //三角波输出
{
DAdata=triangle_tab[wavecount++];
if(wavecount>64) wavecount=0;
DA_S1=0; //打开8位输入寄存器
DA_S1=1; //关闭8位输入寄存器
}
void sine_out() //正弦波输出
{
DAdata=sine_tab[wavecount++];
DA_S1=0; //打开8位输入寄存器
DA_S1=1; //关闭8位输入寄存器
}
void square_out() //方波输出
{
judge=~judge;
if(judge==1) DAdata=0xff;
else DAdata=0x00;
DA_S1=0; //打开8位输入寄存器
DA_S1=1; //关闭8位输入寄存器
}
/1602液晶的相关函数/
#define lcd_ports P1
sbit rs=P2^2;
sbit rw=P2^3;
sbit lcden=P2^4;
void write_com(uchar com)
{
rs=0; //置零，表示写指令
lcden=0;
lcd_ports=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_date(uchar date)
{
rs=1; //置1，表示写数据（在指令所指的地方写数据）
lcden=0;
lcd_ports=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void disp_lcd(uchar addr,uchar temp1)
{
uchar num;
write_com(addr);
delay(1); //延时一会儿
for(num=0;num<16;num++)
{
write_date(temp1[num]);//或者这样写write_date((temp1+num));
delay(1);
}
}
void init_lcd()
{
//uchar num;
lcden=0; //可有可无
rw=0; //初始化一定要设置为零，表示写数据
write_com(0x38); //使液晶显示点阵，为下面做准备
write_com(0x0c); //初始设置
write_com(0x06); //初始设置
write_com(0x01); //清零
write_com(0x80); //使指针指向第一行第一格
disp_lcd(0x80,&lcd_hang1[316]); //在第一行显示
disp_lcd(0xc0,&lcd_hang1[416]); //在第二行显示
}
/1602液晶函数声明结束/
void main()
{
uchar i=0;
DA_S2=0; //使DAC寄存器处于直通状态
DAdata=0;
DA_S1=1; //关闭8位输入寄存器
init_lcd();
waveform=0;
TMOD=0x01; //设置定时器0为16位工作方式
IT0=1; //设置外部中断0为下降沿触发
ET0=1; //开定时器中断
EX0=1;
EA=1;
while(1)
{
//DAout(0xff); //可输出TTL波形
//DAout(0x80);
//T_temp=32;
}
}
void timer0() interrupt 1
{
TH0=THtemp;
TL0=TLtemp;
if(waveform==0) sine_out();
else if(waveform==1) triangle_out();
else if(waveform==2) square_out();
}
void key_int0() interrupt 0
{
uchar keytemp;
uint total_freq; //总频率
EA=0; TR0=0; //关总中断与定时器
delay(5); //延时够吗
if(key==0) //确实有按键按下而引发中断
{
keytemp=P3&0xf0; //获取P3口高四位的值
switch(keytemp)
{
case 0xe0: //选择波形
waveform++;
if(waveform>2) waveform=0;
break;
case 0xd0: //频率按规定单位依次增加
wavefreq[waveform]++;
if(wavefreq[waveform]>10) wavefreq[waveform]=1; // /这边要用“>10”，因为它比“=11”可靠
break; // 性更高,使加数有个上限，不会一直加下去/
case 0xb0: //频率按规定单位依次衰减
wavefreq[waveform]--;
if(wavefreq[waveform]<1) wavefreq[waveform]=10; //这边要用“<1”，因为它比“=0”可靠性更高
break;
case 0x70: //TTL输出
DA_S2=1; //使DAC寄存器关闭
break;
}
THtemp=waveTH[waveform10+(wavefreq[waveform]-1)]; //方括号中选取第几个数后，并把该值赋给T_temp
TLtemp=waveTL[waveform10+(wavefreq[waveform]-1)];
total_freq= wavefreq[waveform] freq_unit[waveform]; //求输出频率（个数单位）
lcd_hang2[5]=total_freq%10+0x30; //在液晶中显示个位，(0x30 在液晶显示中表示数字0)
total_freq/=10; lcd_hang2[4]=total_freq%10+0x30; //在液晶中显示时十位
total_freq/=10; lcd_hang2[3]=total_freq%10+0x30; //在液晶中显示时百位
total_freq/=10; lcd_hang2[2]=total_freq%10+0x30; //在液晶中显示时千位
disp_lcd(0x80,&lcd_hang1[waveform16]); //在第一行显示
disp_lcd(0xc0,lcd_hang2); //在第二行显示
}
wavecount=0; //'抽点'计数清零
while(!key);
EA=1; TR0=1; //开启总中断与定时器
}
#include<reg51h>
sbit wela=P2^7;
sbit dula=P2^6;
sbit dawr=P3^6;
sbit csda=P3^2;
unsigned char a,j,k;
void delay(unsigned char i)
{
for(j=i;j>0;j--)
for(k=125;k>0;k--);
}
void main()
{
wela=0;
dula=0;
csda=0;
a=0;
dawr=0;
while(1)
{
P0=a;
P1=a;
delay(1000);
a++;
if(a>=254)
a=0;
}
}
PORT EQU 0CFA0H ;定义DAC接口地址
CSEG AT 4000H
LJMP START
CSEG AT 4100H
START:
MOV DPTR,#PORT+1;DAC输出寄存器端口地址送DPTR
MOV A,#00H ;给A赋初值
LOOP:
MOV B,#0FFH ;置计数初值与B
LOOP1:
MOV DPTR,#PORT ; DAC输入寄存器端口地址
MOVX @DPTR,A ;送出数据
INC DPTR ;地址加一
MOVX @DPTR,A ;启动转换
INC A ;数据加一
CJNE A,#0FFH,LOOP1 ;如果没到峰值，循环转换
MOV A,#00H ;赋A=0
DJNE B,LOOP ;x显示锯齿波
RET
这是51单片机的 和8086差不多 可根据这个程序修改 纯手打的 包括注释 希望楼主采纳 ！！O(∩_∩)O
1这个程序频率值是怎么设定的？
就是通过key_up ，key_dw来设定的，type里面的数已经按照不同频率的正弦波，算出不同点的值（用于da转换），用查表的方法来设定频率值（到底要的是哪一个频率值，通过counter的大小选择type里的某一串数送给da来决定）
2 while(1)
{
if(key_up == 0) if(step<4096) step++;
if(key_dw == 0) if(step>1) step--;
while((!key_up)||(!key_dw));
}
这是什么意思？4096这些是什么意思。。。
key_up ，key_dw 这两个端口应该是接按键了吧，采用查询的方法判断键是否按下，
while((!key_up)||(!key_dw));按键按下后等待按键释放！4069的意思，比如说你要访问一组数组，数组只有10个元素，你能访问第十一个元素吗？去学一下什么是type型的数，就知道为何是4069了。
3程序看不太懂，急需大致讲解。
单片机和c语言你要是一点也不会，我肯定给你讲不懂的，你要是会的话，多看几遍肯定就会了
希望能帮到你！
#include<reg51h>
#include<absacch> //定义绝对地址访问的头文件
#define dac1 XBYTE[0xdfff] // X 轴0832一级琐存地址
unsigned char code type[256]={ //一堆数，一堆不同频率正弦波的正弦值
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};
unsigned char i,j;
unsigned int counter,step;
sbit key_up = P3^2;
sbit key_dw = P3^3; //按键定义
//定时器0初始化
void Init_Timer0(void)
{
TMOD = (TMOD & 0XF0) | 0X01;
TH0 = 0xff;
TL0 = 0xff;
TR0 =1;
ET0 =1;
}
main()
{
Init_Timer0();
step=2;
EA = 1;
while(1) //判断按键
{
if(key_up == 0) if(step<4096) step++;
if(key_dw == 0) if(step>1) step--;
while((!key_up)||(!key_dw));
}
}
// 系统OS定时中断服务
void OS_Timer0(void) interrupt 1 using 2 //定时子程序
{
TH0 = 0xff;
TL0 = 0xff;
counter = counter + step;
dac1=type[(unsigned int)counter>>8]; //根据键值，选择某一个频率的正弦波，送入da转换！
}
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