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本帖最后由 gejilin 于 2013-4-7 21:18 编辑
#include #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 ***it 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 ***it 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 ***it 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[3]={10,50,200}; //三种波的频率增减单位 uchar idata wavefreq[3]={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! "}; 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，DA端口转换 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}; 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 } /************1602液晶的相关函数*************/ #define lcd_ports P1 ***it rs=P2^2; ***it rw=P2^3; ***it 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=0;num<16;num++) { 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[3*16]); //在第一行显示 disp_lcd(0xc0,&lcd_hang1[4*16]); //在第二行显示 } /********************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(); } void key_int0() interrupt 0 { uchar keytemp; uint total_freq; //总频率 EA=0; TR0=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>2) waveform=0; 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[7]=total_freq%10+0x30; //在液晶中显示个位，(0x30 在液晶显示中表示数字0) lcd_hang2[6]=total_freq/10%10+0x30; //在液晶中显示时十位 lcd_hang2[5]=total_freq/100%10+0x30; //在液晶中显示时百位 lcd_hang2[4]=total_freq/1000%10+0x30; //在液晶中显示时千位 lcd_hang2[3]=total_freq/10000%10+0x30; //在液晶中显示时万位 lcd_hang2[2]=total_freq/100000%10+0x30; //在液晶中显示时十万位 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=1; TR0=1; //开启总中断与定时器 } 这是网上的一段波形生成器程序，感觉很经典，但我刚学，有些地方不懂，请教下。 /*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}; 这段不太理解，希望打击帮忙解释下，如果我需要最高频率为100k怎么弄？我试了下，改按键的次数，最多51k就会乱跳，超过2k（原程序是2k）波形就不对了。谢谢大家 
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4个回答
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他这些数是怎么计算的，看不懂啊，这些数代表说明。。
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定时器的值。频率的更改是通过改变定时时间实现的。 你一个周期的波形实际周期就是定时器时间乘以一个周期波形的点数（就是你送到DAC中数据的个数）你50K以上会乱可能是定时中断中波形输出的时间过长所导致的
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以正弦波为例。100K周期为100uS。 你有256个点 则中断间隔为0.4us。即定时器中断时间应为0．4us。 如果单片机主频8M是肯定不行的
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算错了是10us。 0．04uS。 这样就更难了
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