#include<reg51.h>
sbit P10=P1^0
void main()
{ EA=1ET1=1TR0=1
TMOD=01
TH0=65536-2000/256
TL0=65536-2000%256
while(1)
{
P10=~P10
}
}
void NT1() interrupt 3
{
TH0=65536-2000/256
TL0=65536-2000%256
}
以下程序是0832产生的三种波形 三角波 锯齿饥坦晌波 方波
#include <AT89X51.H>
#include<absacc.h>
#define PP XBYTE[0x7fff]
#define uint unsigned int
uint i,j,k
void delay(uint z)
void main()
{
while(1)
{
if(P1_0==0)
{ delay(10)
if(P1_0==0)
{ while(P1_2!=0&&P1_1!=0)
{ P1_3=0
for(i=255i>=0i--)
}
while(P1_0!=1)
} }
if(P1_1==0)
{ delay(10)
if(P1_1==0)
{ P1_4=0
while(P1_0!=0&&P1_2!=0)
{ for(j=0j<=254j++)
for(j=255j>=0j--)
}
while(P1_1!=1)}}
if(P1_2==0)
{ delay(10)
if(P1_2==0)
{ while(P1_0!=0&&P1_1!=0)
{P1_5=0
PP=255
delay(10)
PP=0
delay(10)} } }
} }
void delay(uint z)
{ uint x,y
for(x=zx>0x--)
for(y=120y>0y--)
}
#include<reg52.h>#define uchar unsigned char
#define uint unsigned int
//#define Fosc 24000000/12000000 //12分频后的频率
#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
//uint T_temp
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[4]={10,50,200,10}//三种波的频率单位 sawtooth
uchar idata wavefreq[4]={1,1,1,1} /枝裂/给每种波定义一个数组单元猛销闭，用于存放单位频率的个数
uchar code lcd_hang1[]={"Sine Wave " "Triangle Wave " "Square Wave " "sawtooth Wave ""Select Wave:" "press No.1 key! "}
uchar idata lcd_hang2[16]={"f=Hz"}
/*uchar code wave_freq_adjust[]={ //频率调整中间值
0xff,0xb8,0x76,0x56,0x43,0x37,0x2e,0x26,0x20,0x1c, //正弦波频率调整中间值
0xff,0x8e,0x5a,0x41,0x32,0x28,0x20,0x1b,0x17,0x0e,//三角波频率调整中间值
0xff,0x8e,0x5a,0x41,0x32,0x28,0x20,0x1b,0x17,0x0e}
uint code wave_freq_adjust[]={ //频率调整中间值
380,184,118,86,67,55,46,28,38,32,
295,142, 90,65,50,40,32,27,23,14,
295,142, 90,65,50,40,32,27,23,14}*/
/*uchar code waveTH[]={
0xfc,0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xfc,0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff}
uchar code waveTL[]={
0xf2,0x78,0xfb,0x3c,0x63,0x7d,0x8f,0x9d,0xa8,0xb1,
0x17,0x0b,0xb2,0x05,0x37,0x58,0x70,0x82,0x90,0x9b,
0x4d,0xa7,0xc4,0xd3,0xdc,0xe2,0xe6,0xea,0xec,0xee}*/
/***********这两组数组很斗核重要，需要根据波形来调试，选择合适的值，使输出波形达到频率要求************/
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,0x0a,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 ,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,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}
uchar code sawtooth_tab[]={
0x00,0x02,0x04,0x06,0x08,0x0a,0x0c,0x0e,0x10,0x12,0x14,0x16,0x18,0x1a,0x1c,0x1e,0x20,0x22,0x24,0x26,0x28,0x2a,0x2c,0x2e,
0x30,0x32,0x34,0x36,0x38,0x3a,0x3c,0x3e,0x40,0x42,0x44,0x46,0x48,0x4a,0x4c,0x4e,0x50,0x52,0x54,0x56,0x58,0x5a,0x5c,0x5e,
0x60,0x62,0x64,0x66,0x68,0x6a,0x6c,0x6e,0x70,0x72,0x74,0x76,0x78,0x7a,0x7c,0x7e,0x80,0x82,0x84,0x86,0x88,0x8a,0x8c,0x8e}
//0x90,0x92,0x94,0x96,0x98,0x9a,0x9c,0x9e,0xa0,0xa2,0xa4,0xa6,0xa8,0xaa,0xac,0xae,0xb0,0xb2,0xb4,0xb6,0xb8,0xba,0xbc,0xbe,
//0xc0,0xc2,0xc4,0xc6,0xc8,0xca,0xcc,0xce,0xd0,0xd2,0xd4,0xd6,0xd8,0xda,0xdc,0xde,0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xee}
void delay(uchar z)
{
uint x,y
for(x=zx>0x--)
for(y=110y>0y--)
}
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
}
void sawtooth_out() //锯齿波输出
{
DAdata=sawtooth_tab[wavecount++]
if(wavecount>71) 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
}
/************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=0num<16num++)
{
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[4*16]) //在第一行显示
disp_lcd(0xc0,&lcd_hang1[5*16]) //在第二行显示
/*for(num=0num<16num++)
{
write_date(table[num])
delay(5)
}
write_com(0x80+0x40) //给指针重新赋值，使之指向第二行第一格
for(num=0num<16num++)
{
write_date(table1[num])
delay(5)
} */
/*TMOD=0x01 //选用定时方式1
TH0=(65536-50000)/256 //赋初值
TL0=(65536-50000)%256//
EA=1//开总中断
ET0=1 //开定时器中断
TR0=1 //启动定时器*/
}
/********************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()
else if(waveform==3) sawtooth_out() //tian jian
}
void key_int0() interrupt 0
{
uchar keytemp
uint total_freq//总频率
EA=0TR0=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>3) waveform=0 //jiang 2 gai wei 3
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[waveform*10+(wavefreq[waveform]-1)]//方括号中选取第几个数后，并把该值赋给T_temp
TLtemp=waveTL[waveform*10+(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/=10lcd_hang2[4]=total_freq%10+0x30//在液晶中显示时十位
total_freq/=10lcd_hang2[3]=total_freq%10+0x30//在液晶中显示时百位
total_freq/=10lcd_hang2[2]=total_freq%10+0x30//在液晶中显示时千位
disp_lcd(0x80,&lcd_hang1[waveform*16]) //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=1TR0=1//开启总中断与定时器
#include<reg52.h> //包含头文件#include<intrins.h>
#define uchar unsigned char //宏定义
#define uint unsigned int
sbit s1=P3^5 //定义按键的接口
sbit s2=P3^6
sbit s3=P3^7
sbit s4=P3^4
sbit s5=P2^3
sbit led0=P3^0 //定义四个LED，分别表示哪拍卜不同的波形
sbit led1=P3^1
sbit led2=P3^2
sbit led3=P3^3
sbit lcdrs=P2^7 //液晶控制引脚，还有一个控制脚是RW，因为我们只需要向液晶里写数据系那是就好了，所以，我们直接将RW引脚接地
sbit lcden=P2^6
char num,boxing,u //定义全局变量
uchar pinlv=100,bujin=1,bujin1=1//频率初始值是10Hz，步进值默认是0.1，显示步进值变量
uchar code table[]="0123456789" //定义显示的数组
uchar code table1[]="Fout= Wave form:"//初始化显示字符
unsigned int m,pwm=50 //定义变量 m
int a,b,h,num1 //定义全局变量
//自定义字符贺州
uchar code zifu[]={ //李穗此数组内数据为液晶上显示波形符号的自定义字符
0x0e,0x11,0x11,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x11,0x11,0x0e,0x00, //正弦波0 1
0x00,0x07,0x04,0x04,0x04,0x04,0x1c,0x00,
0x00,0x1c,0x04,0x04,0x04,0x04,0x07,0x00, //矩形波2 3
0x00,0x01,0x02,0x04,0x08,0x10,0x00,0x00,
0x00,0x10,0x08,0x04,0x02,0x01,0x00,0x00, //三角波4 5
0x00,0x01,0x03,0x05,0x09,0x11,0x00,0x00, //锯齿波6
}
uchar code sin[64]={//此数组内的数据为，da输出对应电压值对应的数字量，0是0V，255是5V
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]={ //一个周期是采样64个点， 所以数组内是64个数据
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 delay(uint xms) //延时函数
{
int a,b
for(a=xmsa>0a--)
for(b=110b>0b--)
}
void write_com(uchar com) //写命令函数
{
lcdrs=0
P0=com
delay(1)
lcden=0
delay(1)
lcden=1
}
void write_date(uchar date) //写数据函数
{
lcdrs=0
P0=date
delay(1)
lcden=0
delay(1)
lcden=1
}
//自定义字符集
void Lcd_ram()
{
uint i,j,k=0,temp=0x04
for(i=0i<7i++)
{
for(j=0j<8j++)
{
write_com(temp+j)
write_date(zifu[k])
k++
}
temp=temp+8
}
}
void init_lcd() //初始化函数
{
uchar i
lcden=0//默认开始状态为关使能端，见时序图
Lcd_ram()
write_com(0x01) //显示清屏，将上次的内容清除，默认为0x01.
write_com(0x0f)
write_com(0x38) //显示模式设置，默认为0x38,不用变。
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 *** 作里进行的
for(i=10i<20i++) //显示初始化
{
write_date(table1[i])//显示第一行字符
}
write_com(0x80+40) //选择第二行
for(i=0i<9i++)
{
write_date(table1[i])//显示第二行字符
}
write_com(0x80+10) //选择第一行第十个位置
write_date(0)
write_date(1)
write_date(0)
write_date(1)
write_date(0)
write_date(1) //显示自定义的波形图案
write_com(0x80+40+9)//选择第二行第九个位置
write_date(' ')
write_date('1')
write_date('0')
write_date('.')
write_date('0')
write_date('H')
write_date('z') //显示初始的频率值
}
void initclock() //定时器初始化函数
{
TMOD=0x01 //定时器的工作方式
TH0=a
TL0=b //定时器赋初值
EA=1 //打开中断总开关
ET0=1 //打开定时器允许中断开关
TR0=1 //打开定时器定时开关
}
void display() //显示函数
{
uchar qian,bai,shi,ge //定义变量用于显示
qian=pinlv/1000//将频率值拆成一位的数据，将数据除以1000，得到的商是一位数，赋值给qian
bai=pinlv%1000/100//将频率除以1000的余数再除以100就得到了频率的百位，赋值给bai
shi=pinlv%1000%100/10 //同上，得到频率的十位
ge=pinlv%1000/100%10
write_com(0x80+40+9)//选中第二行第九个位置
if(qian==0) //千位如果为0
write_date(' ')//不显示
else//千位不为0
write_date(table[qian]) //正常显示千位
if(qian==0&&bai==0) //千位和百位都为0
write_date(' ')//百位不显示
else//不都为0
write_date(table[bai]) //百位正常显示
write_date(table[shi]) //显示十位数
write_date('.')//显示小数点
write_date(table[ge]) //显示个位
write_date('H')//显示频率的单位Hz
write_date('z')
if(boxing==0) //判断波形为正弦波
{
write_com(0x80+10) //选中一行频率图案位置
write_date(0)//显示正弦波图案
write_date(1)
write_date(0)
write_date(1)
write_date(0)
write_date(1)
led3=1
led0=0//点亮正弦波指示灯
}
if(boxing==1)//注释同上
{
write_com(0x80+10)
write_date(2)
write_date(3)
write_date(2)
write_date(3)
write_date(2)
write_date(3)
led0=1
led1=0
}
if(boxing==2)
{
write_com(0x80+10)
write_date(4)
write_date(5)
write_date(4)
write_date(5)
write_date(4)
write_date(5)
led1=1
led2=0
}
if(boxing==3)
{
write_com(0x80+10)
write_date(6)
write_date(6)
write_date(6)
write_date(6)
write_date(6)
write_date(6)
led2=1
led3=0
}
}
void keyscan() //频率调节键盘检测函数
{
if(s1==0) //加按键是否按下
{
EA=0//关闭中断
while(!s1) //按键松开
pinlv+=bujin //频率以步进值加
if(pinlv>1000) //最大加到100Hz
{
pinlv=100 //100Hz
}
display() //显示函数
m=65536-(15000/pinlv)//计算频率
/*频率值最小是10Hz，pinlv的值是100（因为要显示小数点后一位）,150000/100=1500，这个1500就是定时器需要计时的，单位是us，65536-1500得到的是定时器的初值，
先不管初值，先看定时时间，1500us，一个波形的周期是由64个定时组成的，所以，一个波形周期就是64*1500us=96000，也就是96ms，约等
于100ms，也就是10Hz的频率*/
a=m/256 //将定时器的初值赋值给变量
b=m%256
EA=1 //打开中断总开关
}
if(s2==0) //减按键按下
{
EA=0
while(!s2)
pinlv-=bujin//频率以步进值减
if(pinlv<100)
{
pinlv=100
}
display()
m=65536-(15000/pinlv)
a=m/256
b=m%256
EA=1
}
if(s3==0) //波形切换按键
{
EA=0
while(!s3)
boxing++ //波形切换
if(boxing>=4) //4种波形
{
boxing=0
}
display()
EA=1
}
if(s5==0) //PWM切换按键
{
EA=0
while(!s5)
pwm+=10
if(pwm>90)
{
pwm=10
}
// display()
EA=1
}
}
void bujindisplay() //步进值设置界面显示程序
{
uint bai,shi,ge //定义步进值 百十个位
bai=bujin1/100//将步进值除以100得到百位，也就是频率值的十位，因为有一个小数位
shi=bujin1%100/10 //将步进值除以100的余数除以十得到十位
ge=bujin1%100%10 //取余10后得到个位，也就是频率步进值的小数点后一位
write_com(0x80+11) //选中液晶第一行第十一列
if(bai==0) //百位是否为0
write_date(' ') //百位不显示
else //百位不为0
write_date(table[bai]) //显示百位数据
write_date(table[shi]) //显示十位数据
write_date('.') //显示小数点
write_date(table[ge]) //显示个位，也就是小数点后一位
}
void bujinjiance() //步进值设置键盘程序
{
if(s4==0) //步进设置按键按下
{
delay(5)//延时去抖
if(s4==0) //再次判断按键
{
while(!s4) //按键释放，按键松开才继续向下执行
h++//变量加
if(h==1)//进入设置状态时
{
write_com(0x01)//清屏
write_com(0x80)//初始化显示步进设置界面
write_date('S')delay(1) //step value
write_date('t')delay(1)
write_date('e')delay(1)
write_date('p')delay(1)
write_date(' ')delay(1)
write_date('v')delay(1)
write_date('a')delay(1)
write_date('l')delay(1)
write_date('u')delay(1)
write_date('e')delay(1)
write_date(':')delay(1)
bujin1=bujin //步进值赋值给临时变量
bujindisplay()//显示步进值
}
if(h==2)//退出设置
{
h=0 //清零
bujin=bujin1 //设置好的临时步进值赋值给步进变量
init_lcd() //初始化液晶显示
initclock() //定时器初始化
display() //调用显示程序
}
}
}
if(h==1) //设置步进值时
{
if(s1==0) //加按键按下
{
delay(5) //延时去抖
if(s1==0)//再次判断
{
while(!s1) //按键释放
bujin1++ //步进值加1
if(bujin1>=101) //步进值最大100，也就是10.0Hz
{
bujin1=1 //超过最大值就恢复到0.1Hz
}
bujindisplay() //步进显示
}
}
if(s2==0) //减按键，注释同上
{
delay(5)
if(s2==0)
{
while(!s2)
bujin1-- //步进减
if(bujin1<=0)
{
bujin1=100
}
bujindisplay()
}
}
}
}
void main() //主函数
{
init_lcd()//调用初始化程序
m=65536-(15000/pinlv) //定时器初值
a=m/256
b=m%256
initclock() //定时器初始化
led0=0 //点亮第一个波形指示灯
while(1) //进入while循环，括号内为1，一直成立，所以也叫死循环，程序不会跳出，一直在内执行
{
if(h==0)//正常模式不是步进调节
{
keyscan() //扫描按键
// display()
}
bujinjiance() //扫描步进调节程序
switch(boxing) //选择波形
{
case 0 : P1=sin[u]break //正弦波
case 1 : //矩形波
if(u<pwm*64/100)P1=255
else
P1=0
break
case 2 : P1=sanjiao[u]break //三角波
case 3 : P1=juchi[u]break //锯齿波
}
}
}
void T0_time()interrupt 1 //定时器
{
TH0=a
TL0=b
u++//变量加
if(u>=64)//一个周期采样64个点， 所以加到64就清零
u=0//u清零
//根据不同的初值，定时器定时时间不同，达到不同频率的目的
}
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