单片机正弦波显示C程序

//将SINX数组写入程序存储器中，不占用RAM空间，写入后不可更改//-----------------------------------------------------------------------------------//程序功能简介：本程序产生频率可一改变的正弦波，频率改变步长为1HZ，初始化频率为50HZ；//程序思路：本程序用到一个定时器------定时器0，定时器0工作在定时方式下，//定时向DAC0832送数据打点；//------------------------------------------------------#includereg52.h//51芯片管脚定义头文件#defineucharunsignedchar#defineuintunsignedint#defineFosc12000000//晶振频率；#defineALL65536//定时器0处于工作方式1，最大基数长度65536；uintLED4_BUF,LED2_BUF,LED3_BUF;//数码管显示缓冲变量；uintTIMER0_H,TIMER0_L;//定时器0的初值设置；uintNUM=0;//计数变量；uintFREQ=10;//初始频率；unsignedchart,m;inttemp;bitFLAG=0;//频率调节标志;//------------------------------------------------------------------------------------//各端口定义；//------------------------------------------------------------------------------------sbitF_UP=P3^4;sbitF_DOWN=P3^5;//频率下调按钮；ucharcodetable[]={//段码表0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};ucharcodeSINX[]={//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,0x80,0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};//-----------------------------------------------------------------------------------//函数声明；//-----------------------------------------------------------------------------------voiddelay(uintt);//延时函数，用于按键去抖；voiddisplay(uintFREQ);//显示函数；voidcalculate_F();//频率变化，计算定时初值；voidkey_scan();//键盘扫描函数；voidinit();//初始化函数；voidtimer0();//定时器0终端服务函数；//-----------------------------------------------------------------------------------//函数名称：delay()；//入口参数：uchart；//出口参数：无；//函数功能：延时；//------------------------------------------------------------------------------------voiddelay(uintt){uchari,j;while(t--){for(i=0;i10;i++)for(j=0;j10;j++);}}voiddelay1ms(intt){intm;while(t--){for(m=0;m120;m++);}}//-----------------------------------------------------------------------------------//函数名称：calculate_F();//入口参数：无；//出口参数：无；//函数功能：频率计算函数，当频率变化，计算出定时器0初值；//------------------------------------------------------------------------------------voidcalculate_F(){floattemp;temp=ALL-Fosc/12.0/256/FREQ;//ALL-65536Fosc-晶振频率-12MHZFREQ-初始频率(50HZ)TIMER0_H=(uint)temp/256;//定时器0的初始值的高8位TIMER0_L=(uint)temp%256;//定时器0的初始值的低8位}//-----------------------------------------------------------------------------------//函数名称：key_scan()；//入口参数：无；//出口参数：无；//函数功能：按键扫描函数；//------------------------------------------------------------------------------------voidkey_scan(){display(FREQ);if(!F_UP){while(!F_UP)display(FREQ);FREQ++;FLAG=1;}elseif(!F_DOWN){while(!F_DOWN)display(FREQ);FREQ--;FLAG=1;}else;}//-----------------------------------------------------------------------------------//函数名称；//入口参数：无；//出口参数：无；//函数功能：定时器初始化函数；//------------------------------------------------------------------------------------voidinit(){TMOD=0x01;//TMOD-定时/计数器方式寄存器，不能位寻址calculate_F();//根据频率，来计算定时器初值display(FREQ);TH0=TIMER0_H;//设置定时器T0的初值TL0=TIMER0_L;ET0=1;//中断允许寄存器IEET0-定时器0终端允许位1时允许中断EA=1;//中断允许寄存器IEEA-总中断允许位，1时每个中断源是允许还是禁止由各自的允许位决定TR0=1;//TCON-定时器控制寄存器,可以位寻址TR0-运行控制位，1时启动T0,此时定时器T0开始启动计时}//-----------------------------------------------------------------------------------//函数名称(FREQ)；//入口参数：有；//出口参数：无；//函数功能：数码管显示函数；//------------------------------------------------------------------------------------voiddisplay(FREQ){LED2_BUF=FREQ/100;LED3_BUF=FREQ%100/10;LED4_BUF=FREQ%10;P2=0x4;P1=table[LED2_BUF];delay(1);P2=0x2;P1=table[LED3_BUF];delay(1);P2=0x1;P1=table[LED4_BUF];delay(1);}//-----------------------------------------------------------------------------------//函数名称；//入口参数：无；//出口参数：无；//函数功能：定时器0中断函数；//------------------------------------------------------------------------------------voidtimer0()interrupt1{TR0=0;//关闭定时器T0TH0=TIMER0_H;TL0=TIMER0_L;P2=SINX[NU