1.可實現方波、正弦波、鋸齒波、三角波四種波形
2.通過LCD1602顯示頻率、步進值
3.可用按鍵調整頻率
仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）
下載.png (258.45 KB, 下載次數: 123)
下載附件
2021-3-10 15:10 上傳
單片機源程序如下:
- #include<reg52.h> //包含頭文件
- #include<intrins.h>
- #define uchar unsigned char //宏定義
- #define uint unsigned int
- sbit s1=P3^5; //定義按鍵的接口
- sbit s2=P3^6;
- sbit s3=P3^7;
- sbit s4=P3^4;
- sbit led0=P3^0; //定義四個LED，分別表示不同的波形
- sbit led1=P3^1;
- sbit led2=P3^2;
- sbit led3=P3^3;
-
- sbit lcdrs=P2^7; //液晶控制引腳，還有一個控制腳是RW，因為我們只需要向液晶里寫數據系那是就好了，所以，我們直接將RW引腳接地
- sbit lcden=P2^6;
- char num,boxing,u; //定義全局變量
- int pinlv=100,bujin=1,bujin1=1; //頻率初始值是10Hz，步進值默認是0.1，顯示步進值變量
- uchar code table[]="0123456789"; //定義顯示的數組
- uchar code table1[]="Fout= Wave form:"; //初始化顯示字符
- unsigned long int m; //定義長整形變量 m
- int a,b,h,num1; //定義全局變量
- //自定義字符
- uchar code zifu[]={ //此數組內數據為液晶上顯示波形符號的自定義字符
- 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, //鋸齒波 6
- };
- uchar code sin[64]={ //此數組內的數據為，da輸出對應電壓值對應的數字量，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
- }; //正弦波取碼
- uchar code juxing[64]={ //一個周期是采樣64個點， 所以數組內是64個數據
- 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
- }; //矩形波取碼
- 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
- }; //三角波取碼
- 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
- }; //鋸齒波取碼
- void delay(uint xms) //延時函數
- {
- int a,b;
- for(a=xms;a>0;a--)
- for(b=110;b>0;b--);
- }
- void write_com(uchar com) //寫命令函數
- {
- lcdrs=0;
- P0=com;
- delay(1);
- lcden=1;
- delay(1);
- lcden=0;
- }
- void write_date(uchar date) //寫數據函數
- {
- lcdrs=1;
- P0=date;
- delay(1);
- lcden=1;
- delay(1);
- lcden=0;
- }
- //自定義字符集
- void Lcd_ram()
- {
- uint i,j,k=0,temp=0x40;
- for(i=0;i<7;i++)
- {
- for(j=0;j<8;j++)
- {
- write_com(temp+j);
- write_date(zifu[k]);
- k++;
- }
- temp=temp+8;
- }
- }
- void init_lcd() //初始化函數
- {
- uchar i;
- lcden=0; //默認開始狀態為關使能端，見時序圖
- Lcd_ram();
- write_com(0x0f);
- write_com(0x38); //顯示模式設置，默認為0x38,不用變。
- write_com(0x01); //顯示清屏，將上次的內容清除，默認為0x01.
- write_com(0x0c); //顯示功能設置0x0f為開顯示，顯示光標，光標閃爍；0x0c為開顯示，不顯光標，光標不閃
- write_com(0x06); //設置光標狀態默認0x06,為讀一個字符光標加1.
- write_com(0x80); //設置初始化數據指針，是在讀指令的操作里進行的
- for(i=10;i<20;i++) //顯示初始化
- {
- write_date(table1[i]); //顯示第一行字符
- }
- write_com(0x80+0x40); //選擇第二行
- for(i=0;i<9;i++)
- {
- write_date(table1[i]); //顯示第二行字符
- }
- write_com(0x80+10); //選擇第一行第十個位置
- write_date(0);
- write_date(1);
- write_date(0);
- write_date(1);
- write_date(0);
- write_date(1); //顯示自定義的波形圖案
- write_com(0x80+0x40+0x09); //選擇第二行第九個位置
- write_date(' ');
- write_date('1');
- write_date('0');
- write_date('.');
- write_date('0');
- write_date('H');
- write_date('z'); //顯示初始的頻率值
- }
- void initclock() //定時器初始化函數
- {
- TMOD=0x01; //定時器的工作方式
- TH0=a;
- TL0=b; //定時器賦初值
- EA=1; //打開中斷總開關
- ET0=1; //打開定時器允許中斷開關
- TR0=1; //打開定時器定時開關
- }
51黑論壇_1、函數發生器.rar
(7.53 MB, 下載次數: 119)
2021-3-10 15:11 上傳
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