单片机正弦波显示C程序.doc

/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；/- #include /51芯片管脚定义头文件#define uchar unsigned char#define uint unsigned int#define Fosc 12000000 /晶振频率；#define ALL 65536 /定时器0处于工作方式1，最大基数长度 65536；uint LED4_BUF,LED2_BUF,LED3_BUF;/数码管显示缓冲变量；uint TIMER0_H,TIMER0_L; /定时器0的初值设置；uint NUM=0; /计数变量；uint FREQ=10; /初始频率；unsigned char t,m;int temp;bit FLAG=0; /频率调节标志;/-/ 各端口定义；/-sbit F_UP=P34;sbit F_DOWN=P35; /频率下调按钮；uchar code table=/段码表0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8, 0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e;uchar code SINX=/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；/- void delay(uint t); /延时函数，用于按键去抖； void display(uint FREQ); /显示函数； void calculate_F(); /频率变化，计算定时初值； void key_scan(); /键盘扫描函数； void init(); /初始化函数； void timer0(); /定时器0终端服务函数；/-/函数名称：delay()；/入口参数：uchar t；/出口参数：无；/函数功能：延时；/- void delay(uint t) uchar i,j; while(t-)for(i=0;i10;i+)for(j=0;j10;j+); void delay1ms(int t)int m;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；/-void calculate_F()float temp;temp=ALL-Fosc/12.0/256/FREQ;/ALL-65536 Fosc-晶振频率-12MHZ FREQ-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；/-void key_scan()display(FREQ);if(!F_UP) while(!F_UP) display(FREQ) ;FREQ+;FLAG=1; else if(!F_DOWN) while(!F_DOWN) display(FREQ);FREQ-;FLAG=1; else ;/-/函数名称init()；/入口参数：无；/出口参数：无；/函数功能：定时器初始化函数；/-void init()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IE ET0-定时器0终端允许位1时允许中断EA=1;/ 中断允许寄存器IE EA-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display(FREQ)；/入口参数：有；/出口参数：无；/函数功能：数码管显示函数；/-void display(FREQ) LED2_BUF=FREQ/100;LED3_BUF=FREQ%100/10;LED4_BUF=FREQ%10;P2=0x4;P1=tableLED2_BUF;delay(1);P2=0x2;P1=tableLED3_BUF;delay(1);P2=0x1;P1=tableLED4_BUF;delay(1);/-/函数名称timer0()；/入口参数：无；/出口参数：无；/函数功能：定时器0中断函数；/-void timer0() interrupt 1TR0=0;/关闭定时器T0TH0=TIMER0_H;TL0=TIMER0_L;P2=SINXNUM;NUM+;/计数变量，初始值为0if(NUM=256)NUM=0