我們的課設要求是設計一個能產生方波、正弦波、三角波、鋸齒波四種波形，且頻率、幅度均可調的函數信號發生器。
我們已經設計好了電路圖，也參考了網上的一些程序，但是自己又不會改。求助大神，68個黑幣是我的全部了。
我們使用AT89C52，DAC0832和LCD1602
希望大神在我們已有的電路圖和程序的基礎上幫我們編一下程
PS：以下程序可以實現產生三種波形和調頻的功能，還差產生鋸齒波、波形調幅和使用矩陣鍵盤這幾個功能。
附錄 程序清單（我們在網上找的程序，可供大神參考） #include<reg52.h> #define uchar unsigned char #define uint unsigned int #define DAdata P0 //DA數據端口 sbit DA_S1= P2^0; // 控制DAC0832的8位輸入寄存器，僅當都為0時，可以輸出數據(處于直通狀態)，否則，輸出將被鎖存 sbit DA_S2= P2^1; // 控制DAC0832的8位DAC寄存器，僅當都為0時，可以輸出數據(處于直通狀態)，否則，輸出將被鎖存 sbit key= P3^2; uchar wavecount; //'抽點'計數 uchar THtemp,TLtemp;//傳遞頻率的中間變量 uchar judge=1; //在方波輸出函數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_unit[3]={10,50,200}; //三種波的頻率單位 uchar idata wavefreq[3]={1,1,1}; //給每種波定義一個數組單元，用于存放單位頻率的個數 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 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]={ //輸出電壓從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, //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,0xab,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 ,0x15,0x13, 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,0x20,0x22,0x25,0x27,0x29,0x2b,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_tab[wavecount++]; if(wavecount>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_tab[wavecount++]; 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*************/ #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，表示寫數據（在指令所指的地方寫數據） 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); //延時一會兒??? for(num=0;num<16;num++) { write_date(temp1[num]);//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，表示寫數據 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_lcd(0x80,&lcd_hang1[3*16]); //在第一行顯示 disp_lcd(0xc0,&lcd_hang1[4*16]); //在第二行顯示 } /********************1602液晶函數聲明結束*********************/ void main() { uchar i=0; DA_S2=0; //使DAC寄存器處于直通狀態 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 ET0=1; //開定時器中斷 EX0=1; EA=1; while(1) { //DAout(0xff); //可輸出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; //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中斷 { keytemp=P3&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: //頻率按規定單位依次增加 wavefreq[waveform]++; if(wavefreq[waveform]>10) wavefreq[waveform]=1; // /*這邊要用“>10”，因為它比“=11”可靠 break; // 性更高,使加數有個上限，不會一直加下去*/ case 0xb0: //頻率按規定單位依次衰減 wavefreq[waveform]--; if(wavefreq[waveform]<1) wavefreq[waveform]=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=waveTH[waveform*10+(wavefreq[waveform]-1)]; //方括號中選取第幾個數后，并把該值賦給T_temp TLtemp=waveTL[waveform*10+(wavefreq[waveform]-1)]; total_freq= wavefreq[waveform] * freq_unit[waveform]; //求輸出頻率（個數*單位） lcd_hang2[5]=total_freq%10+0x30; //在液晶中顯示個位，(0x30 在液晶顯示中表示數字0) total_freq/=10; lcd_hang2[4]=total_freq%10+0x30; //在液晶中顯示時十位 total_freq/=10; lcd_hang2[3]=total_freq%10+0x30; //在液晶中顯示時百位 total_freq/=10; lcd_hang2[2]=total_freq%10+0x30; //在液晶中顯示時千位 disp_lcd(0x80,&lcd_hang1[waveform*16]); //在第一行顯示 disp_lcd(0xc0,lcd_hang2); //在第二行顯示 } wavecount=0; //'抽點'計數清零 while(!key); EA=1; TR0=1; //開啟總中斷與定時器 }
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