51单片机示波器，四种可跳档简单波形仿真与源码 -

#include <reg51.H>
#include<absacc.h>
#define uchar unsigned char
#define uint unsigned int
#define dz XBYTE[0x7fff]//dac0832总线地址
//1602LCD相关
sbit RS = P3^0; //定义端口
sbit EN = P3^1;
//按键定义
sbit key1 = P3^2;
sbit key2 = P3^3;
sbit key3 = P3^4;
sbit key4 = P3^5;
uchar mode = 0;//输出波形的模式
uchar LCDFlag;//LCD更新显示标志
uchar LCDbuf[16];//LCD显示缓存
uchar TIMER_H;//给计数器的值
uchar TIMER_L;
int Fre10X = 200;//当前频率的10的倍数此时为20.0hz
uchar CurStal = 1;//步进档位1=0.1x 10=1x 100=10x
uchar code WaveInfo[3][15] = {"Sine Wave ",//显示当前波形类型
"Triangle Wave ",
"Square Wave "};
uchar i = 0;
//方波
uchar code Squaretab[64] = {0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255
};
//sin波
uchar code Sinetab[256] = {
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,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,0x89,0x86,0x83,0x80,0x80,0x7c,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,
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 };
//三角
uchar code Triangletab[64] = {
0, 8, 16, 24, 32, 40, 48, 56,
64, 72, 80, 88, 96,104,112,120,
128,136,144,152,160,168,176,184,
192,200,208,216,224,232,240,248,
248,240,232,224,216,208,200,192,
184,176,168,160,152,144,136,128,
120,112,104, 96, 88, 80, 72, 64,
56, 48, 40, 32, 24, 16, 8, 0};
//锯齿
uchar code juchi[64] = {
0,4,8,12,16,20,24,28,32,36,40,45,49,53,57,61,65,69,73,77,81,85,89,93,97,101,105,109,113,117,121,125,130,134,138,142,
146,150,154,158,162,166,170,174,178,182,186,190,194,198,202,206,210,215,219,223,227,231,235,239,243,247,251,255
};
//uS延时函数
void DelayUs2x(uchar t)
{
while(--t);
}
//mS延时函数
void DelayMs(uint t)
{
while(t--)
{
DelayUs2x(245);
DelayUs2x(245);
}
}
// 写入命令函数
void LCD_Write_Com(uchar com)
{
RS = 0;
EN = 1;
P1 = com; //送入数据
DelayUs2x(200);
EN = 0;
DelayUs2x(500); //延时等待ＬＣＤ处理数据
}
// 写入数据函数
void LCD_Write_Data(unsigned char Data)
{
RS = 1;
EN = 1;
P1 = Data; //送入数据
DelayUs2x(200);
EN = 0;
DelayUs2x(500); //延时等待ＬＣＤ处理数据
}
// 清屏函数
void LCD_Clear(void)
{
LCD_Write_Com(0x01);
DelayMs(5);
}
// 写入字符串函数
void LCD_Write_String(uchar x, uchar y, uchar *s)
{
if(y == 0)
{
LCD_Write_Com(0x80 + x); //表示第一行
}
else
{
LCD_Write_Com(0xC0 + x); //表示第二行
}
while(*s)
{
LCD_Write_Data(*s);
s++;
}
}
/**************************************************
初始化函数
***************************************************/
void LCD_Init(void)
{
LCD_Write_Com(0x38); //显示模式设置
DelayMs(5);
LCD_Write_Com(0x38);
DelayMs(5);
LCD_Write_Com(0x38);
LCD_Write_Com(0x08); //显示关闭
LCD_Write_Com(0x01); //显示清屏
LCD_Write_Com(0x06); //显示光标移动设置
DelayMs(5);
LCD_Write_Com(0x0C); //显示开及光标设置
}
/**************************************************
在LCD指定位置显示光标
**************************************************/
void LCD_Cursor_Dis(uchar x, uchar y)
{
if(y == 0) //LCD第一行
{
LCD_Write_Com(0x80 + x);
}
else //LCD第二行
{
LCD_Write_Com(0xC0 + x);
}
LCD_Write_Com(0x0F); //光标显示开
DelayUs2x(4); //延时越40us
}
/**************************************************
关闭光标
**************************************************/
void LCD_Close_Cursor()
{
LCD_Write_Com(0x0C); //光标显示关
DelayUs2x(4); //延时越40us
}
void keyscanf() //按键扫描
{
uint temp;
if(key1 == 0)//模式选择
{
mode++;
LCDFlag = 1;
if(mode == 4)
mode = 0;
while(!key1);
}
if(key2 == 0)//增加
{
if((Fre10X + CurStal) < 501)
{
Fre10X = Fre10X + CurStal;
temp = (unsigned long)10000000 / 64 / Fre10X;
TIMER_H = (65535 - temp) / 256;
TIMER_L = (65535 - temp) % 256;
}
LCDFlag = 1;
while(!key2);
}
if(key3 == 0)
{
if((Fre10X - (int)CurStal) > 1)
{
Fre10X = Fre10X - CurStal;
temp = (unsigned long)10000000 / 64 / Fre10X;
TIMER_H = (65535 - temp) / 256;
TIMER_L = (65535 - temp) % 256;
}
LCDFlag = 1;
while(!key3);
}
if(key4 == 0)
{
switch(CurStal)//调整步进档位
{
case 1: CurStal = 10;
break;
case 10: CurStal = 100;
break;
case 100: CurStal = 1;
break;
}
LCDFlag = 1;
while(!key4);
}
}
void init_time()
{
EA = 1; //开中断
ET0 = 1;
TMOD = 0X01; //初始化
TR0 = 1; //开定时器
}
void time0() interrupt 1 using 2
{
TH0 = TIMER_H;
TL0 = TIMER_L;
switch(mode)
{
case 0://正弦显示
dz = Sinetab[i];
i = i + 4;
break;
case 1://三角显示
dz = Triangletab[i];
i = (i + 1) % 64;
break;
case 2://方波显示
dz = Squaretab[i];
i = (i + 1) % 64;
break;
case 3://锯齿波显示
dz = juchi[i];
i = (i + 1) % 64;
break;
}
}
void main()
{
uint temp;
init_time(); //定时器初始化调用
mode = 1;
temp = (unsigned long)10000000 / 64 / Fre10X;
TIMER_H = (65535 - temp) / 256;
TIMER_L = (65535 - temp) % 256;
LCD_Init(); //初始化液晶
LCDFlag = 1; //将液晶需要刷新标志置1
while(1)
{
keyscanf(); //按键一直扫描
if(LCDFlag)
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