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1、显示频率，幅度可调，可产生四种波形，正弦波，方波，锯齿波，三角波，希望你能喜欢，给你发了一张效果图，喜欢的话别忘了采纳我的回答啊#include#define uchar unsigned char#define uint unsigned int#define DAdata P0/DA数据端口sbit DA_S1= P20; / 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= P21; / 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= P32;u
2、char wavecount; /抽点计数uchar THtemp,TLtemp;/传递频率的中间变量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_unit3=10,50,200; /三种波的频率单位uchar idata wavefreq3=1,1,1; /给每种波定义一个数组单元，用于存放单位频率的个数uchar code lcd_hang1=Sine Wave Triangle Wave Square Wave Select Wave: press No.1 key! ;
3、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,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
4、,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,0xf
5、8,0xf0,0xe8,0xe0,0xd8,0xd0,0xc8,0xc0,0xb8,0xb0,0xa8,0xa0,0x98,0x90,0x88,0x80,0x78,0x70,0x68,0x60,0x58,0x50,0x48,0x40,0x38,0x30,0x28,0x20,0x18,0x10,0x08,0x00;uchar code sine_tab256=/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
6、,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,0xf
7、a,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,0x79,0
8、x76,0x72,0x6f,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,
9、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,0x60,0x
10、63,0x66 ,0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80; void delay(uchar z) uint x,y;for(x=z;x0;x-)for(y=110;y0;y-);void triangle_out()/三角波输出 DAdata=triangle_tabwavecount+;if(wavecount64) 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_tabwavecount+;DA_S1=0; /打开8位输入寄存器
11、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/*1602液晶的相关函数*/#define lcd_ports P1sbit rs=P22;sbit rw=P23;sbit lcden=P24;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);lcde
12、n=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=0;num2) waveform=0; break; case 0xd0: /频率按规定单位依次增加 wavefreqwaveform+; if(wavefreqwaveform10) wav
13、efreqwaveform=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 wavefreqwaveform-; if(wavefreqwaveform1) wavefreqwaveform=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=waveTHwaveform*10+(wavefreqwaveform-1); /方括号中选取第几个数后，并把该值赋给
14、T_tempTLtemp=waveTLwaveform*10+(wavefreqwaveform-1); total_freq= wavefreqwaveform * freq_unitwaveform; /求输出频率（个数*单位） lcd_hang25=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/=10; lcd_hang24=total_freq%10+0x30; /在液晶中显示时十位 total_freq/=10; lcd_hang23=total_freq%10+0x30; /在液晶中显示时百位 total_freq/=10; lcd_hang22=total_freq%10+0x30; /在液晶中显示时千位 disp_lcd(0x80,&lcd_hang1waveform*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=1; TR0=1; /开启总中断与定时器