51-單片機和DAC0832輸出方波、矩形波和正弦波由液晶1602顯示的C語言程序

1、精選優(yōu)質文檔-傾情為你奉上顯示頻率，幅度可調，可產生四種波形，正弦波，方波，鋸齒波，三角波，希望你能喜歡，給你發(fā)了一張效果圖，喜歡的話別忘了采納我的回答啊#include<reg52.h>#define uchar unsigned char#define uint unsigned int#define DAdata P0/DA數(shù)據(jù)端口sbit DA_S1= P20; / 控制DAC0832的8位輸入寄存器，僅當都為0時，可以輸出數(shù)據(jù)(處于直通狀態(tài))，否則，輸出將被鎖存sbit DA_S2= P21; / 控制DAC0832的8位DAC寄存器，僅當都為0時，可以輸出數(shù)據(jù)(處于直通

2、狀態(tài))，否則，輸出將被鎖存sbit key= P32;uchar wavecount; /'抽點'計數(shù)uchar THtemp,TLtemp;/傳遞頻率的中間變量uchar judge=1; /在方波輸出函數(shù)中用于簡單判別作用uchar waveform; /當其為0、1、2時，分別代表三種波uchar code freq_unit3=10,50,200; /三種波的頻率單位uchar idata wavefreq3=1,1,1; /給每種波定義一個數(shù)組單元，用于存放單位頻率的個數(shù)uchar code lcd_hang1="Sine Wave " "

3、;Triangle Wave " "Square Wave " "Select Wave: " "press No.1 key! "uchar idata lcd_hang216="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,0xf

4、d,0xfd,0xfe;uchar code waveTL= 0x06,0x8a,0x10,0x4e,0x78,0x93,0xa8,0xb3,0xbe,0xc6, /正弦波頻率調整中間值0xac,0xde,0x48,0x7a,0x99,0xaf,0xbb,0xc8,0xd0,0xde,/三角波頻率調整中間值0x88,0x50,0x90,0x32,0x34,0xbe,0x4a,0xa3,0xe5,0x2c; /*/uchar code triangle_tab= /每隔數(shù)字8，采取一次0x00,0x08,0x10,0x18,0x20,0x28,0x30,0x38,0x40,0x48,0x50,0

5、x58,0x60,0x68,0x70,0x78,0x80,0x88,0x90,0x98,0xa0,0xa8,0xb0,0xb8,0xc0,0xc8,0xd0,0xd8,0xe0,0xe8,0xf0,0xf8,0xff,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_tab256=/輸出電壓從0到

6、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,0x

7、fe,0xff,0xff,0xff,0xff,0xff,0xff,/輸出電壓從最大值到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,0

8、xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99 ,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,/輸出電壓從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 ,0x1

9、5,0x13,0x11,0x10,0x0e,0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,/輸出電壓從最小值到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,

10、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()/三角波輸出 DAdata=triangle_tabwavecount+;if(wavecount&g

11、t;64) wavecount=0;DA_S1=0; /打開8位輸入寄存器DA_S1=1; /關閉8位輸入寄存器void sine_out() /正弦波輸出 DAdata=sine_tabwavecount+;DA_S1=0; /打開8位輸入寄存器DA_S1=1; /關閉8位輸入寄存器void square_out() /方波輸出 judge=judge; if(judge=1) DAdata=0xff;else DAdata=0x00;DA_S1=0; /打開8位輸入寄存器DA_S1=1; /關閉8位輸入寄存器/*1602液晶的相關函數(shù)*/#define lcd_ports P1sbit r

12、s=P22;sbit rw=P23;sbit lcden=P24;void write_com(uchar com)rs=0;/置零，表示寫指令lcden=0;lcd_ports=com;delay(5);lcden=1;delay(5);lcden=0;void write_date(uchar date)rs=1;/置1，表示寫數(shù)據(jù)（在指令所指的地方寫數(shù)據(jù)）lcden=0;lcd_ports=date;delay(5);lcden=1;delay(5);lcden=0;void disp_lcd(uchar addr,uchar *temp1)uchar num;write_com(add

13、r);delay(1); /延時一會兒?for(num=0;num<16;num+)write_date(temp1num);/或者這樣寫write_date(*(temp1+num);delay(1);void init_lcd()/uchar num;lcden=0; /可有可無?rw=0; /初始化一定要設置為零，表示寫數(shù)據(jù)write_com(0x38); /使液晶顯示點陣，為下面做準備write_com(0x0c); /初始設置write_com(0x06); /初始設置write_com(0x01); /清零write_com(0x80); /使指針指向第一行第一格 disp_

14、lcd(0x80,&lcd_hang13*16); /在第一行顯示 disp_lcd(0xc0,&lcd_hang14*16); /在第二行顯示/*1602液晶函數(shù)聲明結束*/void main() uchar i=0;DA_S2=0; /使DAC寄存器處于直通狀態(tài)DAdata=0;DA_S1=1; /關閉8位輸入寄存器init_lcd(); waveform=0;TMOD=0x01; /設置定時器0為16位工作方式IT0=1; /設置外部中斷0為下降沿觸發(fā)ET0=1; /開定時器中斷EX0=1; EA=1;while(1)/DAout(0xff); /可輸出TTL波形/DAo

15、ut(0x80);/T_temp=32; void timer0() interrupt 1TH0=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; /總頻率EA=0; TR0=0; /關總中斷與定時器delay(5); /延時夠嗎?if(key=0) /確實有按鍵按下而引發(fā)中斷keytemp=P3&

16、;0xf0; /獲取P3口高四位的值switch(keytemp) case 0xe0:/選擇波形 waveform+; if(waveform>2) waveform=0; break; case 0xd0: /頻率按規(guī)定單位依次增加 wavefreqwaveform+; if(wavefreqwaveform>10) wavefreqwaveform=1; / /*這邊要用“>10”，因為它比“=11”可靠 break; / 性更高,使加數(shù)有個上限，不會一直加下去*/ case 0xb0: /頻率按規(guī)定單位依次衰減 wavefreqwaveform-; if(wavefr

17、eqwaveform<1) wavefreqwaveform=10; /這邊要用“<1”，因為它比“=0”可靠性更高 break; case 0x70: /TTL輸出 DA_S2=1; /使DAC寄存器關閉 break; THtemp=waveTHwaveform*10+(wavefreqwaveform-1); /方括號中選取第幾個數(shù)后，并把該值賦給T_tempTLtemp=waveTLwaveform*10+(wavefreqwaveform-1); total_freq= wavefreqwaveform * freq_unitwaveform; /求輸出頻率（個數(shù)*單位） lcd_hang25=total_freq%10+0x30; /在液晶中顯示個位，(0x30 在液晶顯示中表示數(shù)字0) total_freq/=10; lcd_hang24=total_freq%10+0x30; /在液晶中顯示時十