51单片机DAC0832波形发生器仿真加程序源码 -

第一次运行示波器会自动打开,在关闭示波器也就是叉了之后,再次运行不会自动打开,需右击示波器选择最下面英文选项.

连接四个扫描口中的一个,对应有四个channal,旋钮调节扫描电压值以改变格子代表单位,,指向为一格所代表的电压值,例如指向2mv,则上下一格代表2mv.滚轮移动上下坐标,可调节使其对其某根线便于测量.

Horizontal旋钮横向扫描周期调节,可用于调节周期波形宽度,横向滚轮调节水平坐标.小旋扭都为微调.

TMOD用于写入方式控制字,,以选择定时/计数器的工作状态及控制方式;共八位,高四位与低四位相同,分别是GATE C/T M1 M0,高四位控制T1,低四位控制T0.

M1M0用于指定工作方式,通过00 01 10 11的组合,可使定时/计数器分别对应工作在0 1 2 3方式

C/T:选择定时/计数.C,T分别表示计数器和定时器.当C/T=1时,选择计数状态,当C/T=0时选择定时状态

TH0= TL0= 计数器0的高八位和第八位,组合以放更大的数字,加一计数直至计数器满溢出,这时打开EA(EA=1)开启中断总开关,打开ET0开启计数器一中断开关,TR0=1,开启定时器0开关

实参赋给Initclock()TH0,TL0,a=m/256;b=m%256;赋初值的意义是使计数器提前溢出从而启动中断

S3是波形变换按键,首先关闭总中断执行下方语句,按钮按下判断,当

S3=0即按钮按下,while(!s3); 语句代表按键按下时,进行死循环不执行下方语句,松开按键后boxing++是波形变换关键,通过变boxing的值,赋给switch()语句选择波形

Sin[] juxing[] sanjiao[] juchi[] 为四个数组,通过赋值给P1并行IO口,传给DAC0832以VREF输出模拟信号,通过中断中的u++实现数组取数组元素的移动,实现信号的变换,在波形显示器上显示波形,然后打开中断执行变换后波形,

按键s1,s2执行波形频率的加减.同样关闭中断,pinglv+=bujin改变值,然后打开中断.

#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit s1=P3^5;
sbit s2=P3^6;
sbit s3=P3^7;
sbit s4=P3^4;
int pinlv=100,bujin=1;
unsigned int m;
char boxing,u;
int a,b;
uchar code sin[64]={
135,145,158,167,176,188,199,209,218,226,234,240,245,249,252,254,254,253,251,247,243,237,230,222,213,204,193,182,170,158,
146,133,121,108,96,84,72,61,50,41,32,24,17,11,7,3,1,0,0,2,5,9,14,20,28,36,45,55,66,78,90,102,114,128
}; //正弦波取码
uchar code juxing[64]={
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
}; //矩形波取码
uchar code sanjiao[64]={
0,8,16,24,32,40,48,56,64,72,80,88,96,104,112,120,128,136,144,152,160,168,176,184,192,200,208,216,224,232,240,248,
248,240,232,224,216,208,200,192,184,176,168,160,152,144,136,128,120,112,104,96,88,80,72,64,56,48,40,32,24,16,8,0
}; //三角波取码
uchar code juchi[64]={
0,4,8,12,16,20,24,28,32,36,40,45,49,53,57,61,65,69,73,77,81,85,89,93,97,101,105,109,113,117,121,125,130,134,138,142,
146,150,154,158,162,166,170,174,178,182,186,190,194,198,202,206,210,215,219,223,227,231,235,239,243,247,251,255
}; //锯齿波取码
void initclock()
{
TMOD=0x01;
TH0=a ;
TL0=b ;
EA=1;
ET0=1;
TR0=1;
}
void delay(uint xms)
{
int c,d;
for (c=xms;c>0;c--)
for(d=110;d>0;d--);
}
void keyscan()
{
if(s1==0)
{
EA=0;
delay(2);
if(s1==0)
{
while(!s1);
pinlv+=bujin;
if(pinlv>1000)
{
pinlv=100;
}
m=65536-(150000 / pinlv);
a=m / 256;
b=m % 256;
EA=1;
}
}
if(s2==0)
{
delay(5);
if(s2==0)
{
EA=0;
while(!s2);
pinlv-=bujin;
if(pinlv<100)
{
pinlv=1000;
}
m=65536-(150000/pinlv);
a=m/256;
b=m%256;
EA=1;
}
}
if(s3==0)
{
delay(5);
if(s3==0)
{
EA=0;
while(!s3);
boxing++;
if(boxing>=4)
{
boxing=0;
}
EA=1;
}
}
}
void main()
{
m=65536-(150000/pinlv);
a=m/256;
b=m%256;
initclock();
while(1)
{
keyscan();
switch(boxing)
{
case 0 : P1=sin[u]; break;
case 1 : P1=juxing[u]; break;
case 2 : P1=sanjiao[u]; break;
case 3 : P1=juchi[u]; break;
}
}
}
void T0_time()interrupt 1
{
TH0= a ;
TL0= b ;
u++;
if(u>=64)
u=0;
}

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