基于DAC0832的函数信号发生器仿真程序及pcb与原理图 -

#include<reg52.h> //包含头文件
#include<intrins.h>
#include<absacc.h>
#define uchar unsigned char //宏定义
#define uint unsigned int
sbit lcdrs=P3^0; //液晶控制位
sbit lcden=P3^1;
sbit csda=P3^3; //DA控制位
sbit wr=P3^4;
char num,boxing,u; //定义全局变量
uint pinlv;
uchar code table[]="0123456789"; //定义显示的数组
uchar code table1[]="frequence:boxing:";
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 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
uchar code tixing[64]={
0,13,26,39,52,65,78,91,104,117,130,143,156,169,182,195,208,221,234,247,247,247,247,247,247,247,247,247,247,247,247,247,247,247,247,247,247,247,
247,247,247,247,247,247,247,242,229,216,203,190,177,164,151,138,125,112,99,86,73,60,47,34,21,8
}; //梯形波取码
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
void delay(uint xms) //延时函数
{
int a,b;
for(a=xms;a>0;a--)
for(b=110;b>0;b--);
}
void write_com(uchar com) //写命令函数
{
lcdrs=0;
P0=com;
delay(1);
lcden=1;
delay(1);
lcden=0;
}
void write_date(uchar date) //写数据函数
{
lcdrs=1;
P0=date;
delay(1);
lcden=1;
delay(1);
lcden=0;
}
void init_lcd() //初始化函数
{
lcden=0; //默认开始状态为关使能端，见时序图
write_com(0x0f);
write_com(0x38); //显示模式设置，默认为0x38,不用变。
write_com(0x01); //显示清屏，将上次的内容清除，默认为0x01.
write_com(0x0c); //显示功能设置0x0f为开显示，显示光标，光标闪烁；0x0c为开显示，不显光标，光标不闪
write_com(0x06); //设置光标状态默认0x06,为读一个字符光标加1.
write_com(0x80); //设置初始化数据指针，是在读指令的操作里进行的
}
void initclock() //时钟初始化
{
uint i;
TMOD=0x01;
TH0=(65536-1563)/256;
TL0=(65536-1563)%256;
EA=1;
ET0=1;
TR0=1;
for(i=10;i<17;i++) //显示初始化
{
write_date(table1[i]);
delay(5);
}
write_com(0x80+0x40);
for(i=0;i<10;i++)
{
write_date(table1[i]);
delay(5);
}
write_com(0x80+7);
write_date('s');
write_date('i');
write_date('n');
write_date(' ');
write_date(' ');
write_date(' ');
write_date(' ');
write_com(0x80+0x40+0xa);
write_date(' ');
write_date('1');
write_date('0');
write_date('H');
delay(5);
write_date('Z');
delay(5);
}
void display() //显示函数
{
uchar bai,shi,ge;
if(num<10)
{
pinlv=num*10+10;
}
if(num>9)
{
pinlv=(num-9)*50+100;
}
bai=pinlv/100;
shi=pinlv%100/10;
ge=pinlv%100%10;
write_com(0x80+0x40+0xa);
if(bai<1)
{
write_date(' ');
delay(5);
}
if(bai!=0)
{
write_date(table[bai]);
delay(5);
}
write_date(table[shi]);
delay(5);
write_date(table[ge]);
delay(5);
write_date('H');
delay(5);
write_date('Z');
delay(5);
if(boxing==0)
{
write_com(0x80+7);
write_date('s');
write_date('i');
write_date('n');
write_date(' ');
write_date(' ');
write_date(' ');
write_date(' ');
}
if(boxing==1)
{
write_com(0x80+7);
write_date('j');
write_date('u');
write_date('x');
write_date('i');
write_date('n');
write_date('g');
}
if(boxing==2)
{
write_com(0x80+7);
write_date('j');
write_date('u');
write_date('c');
write_date('h');
write_date('i');
write_date(' ');
}
if(boxing==3)
{
write_com(0x80+7);
write_date('t');
write_date('i');
write_date('x');
write_date('i');
write_date('n');
write_date('g');
}
if(boxing==4)
{
write_com(0x80+7);
write_date('s');
write_date('a');
write_date('n');
write_date('j');
write_date('i');
write_date('a');
write_date('o');
}
}
//kbscan(void)按键扫描程序
uchar keyscan() //键盘扫描
{
uchar h,l,value;
P1=0xf0; //列置0
h=P1&0Xf0; //判断哪一行按下
if(h!=0xf0) //判断是否按下
{
delay(10); //消抖
if(h!=0xf0)
{
l=P1|0x0f; //把列置1
P1=l; //把列状态给P1口
l=P1&0x0f; //判断那一列按下
h=P1&0Xf0; //判断哪一行按下
value=h+l; //组合起来到底是那个按键按下
}
return value;
}
}
void keypros() //按键处理
{
uchar key=0;
key=keyscan();
if(key==0xee)
{
EA=0;
delay(200);
num++;
if(num==12)
{
num=0;
}
display();
EA=1;
if(num>9)
{
EA=0;
}
}
else if(key==0xde)
{
EA=0;
delay(200);
num--;
if(num<0)
{
num=0;
}
display();
EA=1;
if(num>9)
{
EA=0;
}
}
else if(key==0xbe)
{
EA=0;
delay(200);
boxing++;
if(boxing==5)
{
boxing=0;
}
display();
EA=1;
}
else if(key==0x7e)
{
EA=0;
write_com(0x01);
}
}
void delaym() //短暂延时
{
_nop_();_nop_(); _nop_(); _nop_();_nop_();_nop_();
}
void main() //主函数
{
init_lcd();
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