方波；
锯齿波
正弦波
#include<AT89X52.H>
#include <INTRINS.H>
#include<math.h>
#define uchar unsigned char
#define uint unsigned int
// 绘图坐标限制
#define glcd_XMAX 240
#define glcd_XMIN 0
#define glcd_YMAX 128
#define glcd_YMIN 0
#define uchar unsigned char
#define uint unsigned int
#define L240DAT P1
sbit L240CD=P3^3;
sbit L240RD=P3^4;
sbit L240WR=P3^5;
sbit L240BC=P1^0;
sbit L240BD=P1^1;
sbit RST=P3^2;
sbit CLK=P3^0;
sbit DAT= P3^1;
sbit CS= P3^7;
void L_Delay()
{
uchar i;
for ( i=0; i<48; i++ ) ;
}
void S_Delay() //在传送指令或字节时,CLK要持续8μs的高电平.
{
char i;
for ( i=0; i<8; i++ ) ;
}
/
void line(int x1, int y1, int x2, int y2, unsigned char show)
{
int dy ;
int dx ;
int stepx, stepy, fraction;
dy = y2 - y1; //Y长度
dx = x2 - x1; //X长度
if (dy < 0) //Y2<Y1:
{
dy = -dy;
stepy = -1; //Y负向
}
else
{
stepy = 1; //Y正向
}
if (dx < 0)
{
dx = -dx; //X负向
stepx = -1;
}
else
{
stepx = 1; //X正向
}
dy <<= 1; //DY左移一位*2
dx <<= 1;
if((x2<240&x1>0)|(x1<240&x2>0))
{writepoint(x1,y1,show);}
if (dx > dy)
{
fraction = dy - (dx >> 1);
while (x1 != x2)
{
if (fraction >= 0)
{
y1 += stepy;
fraction -= dx;
}
x1 += stepx;
fraction += dy;
writepoint(x1,y1,show);
}
}
else
{
fraction = dx - (dy >> 1);
while (y1 != y2)
{
if (fraction >= 0)
{
x1 += stepx;
fraction -= dy;
}
y1 += stepy;
fraction += dx;
writepoint(x1,y1,show);
}
}
writepoint(x1,y1,show);
}
void circle(int x, int y, int radius, unsigned char show)
{
int xc = 0;
int yc ;
int p ;
clear_graph();
yc=radius;
p = 3 - (radius<<1);
while (xc <= yc)
{
writepoint(x + xc, y + yc, show);//在X+XC（圆点附近值最大）上下画两个点
writepoint(x + xc, y - yc, show);
writepoint(x - xc, y + yc, show);//在X-XC上下画两个点
writepoint(x - xc, y - yc, show);
writepoint(x + yc, y + xc, show);//在X+YC(最右侧数值最小)上下画两个点
writepoint(x + yc, y - xc, show);
writepoint(x - yc, y + xc, show);//在X-YC（最右侧数值最小）上下画两个点
writepoint(x - yc, y - xc, show);
if (p < 0)
p += (xc++ << 2) + 6;
else
p += ((xc++ - yc--)<<2) + 10;
}
Delay(500) ;
}
void fangbo (uchar F,int A) //周期为T，振幅为A，能显示240/T个周期
{ uchar T0;
int j=0;
clear_graph();
l240wc(0x9C);//98开图，9c开文本和图，94开文本
af(A,F);
T0=1000/F;
line(00,64,240,64,1);
for(j=0;j<240/T0;j++)
{ line(j*T0,64-A,(2*j+1)*T0/2,64-A,1);
line((2*j+1)*T0/2,64+A,(j+1)*T0,64+A,1);
}
}
void juchibo(uchar F,int A)
{ int i=0;
float T0;
clear_graph();
l240wc(0x9c);
T0=1000/F;
af(A,F);
line(00,64,240,64,1);
for(i=0;i<240/T0;i++)
{ line(i*T0,64,(i+1)*T0,64-A,1);
line((i+1)*T0,64-A,(i+1)*T0,64,1);
}
}
//********正弦函数显示**************************
//四个参数分别为：x，y为原点坐标（精确位置）；t为周期；f为振幅。
void zhengxian (uchar x,uchar y,uchar t,uchar A)
{ uchar i=0,j=0,m=0,p=0,q=0;
m=x;
clear_graph();
l240wc(0x9c);
af(A,t);
A=45;
t=30;
line(00,64,240,64,1);//x轴，从x到y+f+10
writepoint(x,y-(uchar)A*sin(0),1); //坐标原点（x，y）
{
for(i=0;i<=230-m;i++) // m=x，230-x个点
{
if(i!=0) //i！=0时画点（），x为原点横坐标，p=0？？？？
{
p=q ;
writepoint(x,p,1);
}
else p=y; //开始i=0时，
j++; x++; //横坐标加一，每个周期内第j个采样值，指针递增
q=y-(unsigned char)A*sin(6.28*j/t);//q=y-f*sin（jw）；振幅；2πj/t=jw
line(x,p,x,q,1);//横坐标为0，纵坐标从0到振幅的直线
if(j==t) //如果采样个数达到周期，重新开始下一周期
j=0;
}
}
}
uchar kbscan(void)
{uchar sccode,j,k=0;
P1=0xf0;
if((P1&0xf0)!=0xf0)
{Delay(30);
if((P1&0xf0)!=0xf0)
{sccode=0xfe;
for(j=0;j<4;j++)
{P1=sccode;
if((P1&0xf0)!=0xf0)
{k=~P1;
while((P1&0XF0)!=0XF0);
return (k);
}
else sccode=(sccode<<1)|0x01;
}
}
}
return(0);
}
uchar bian(uchar key)
{switch(key)
{case 0x81: return 0;break;
case 0x82: return 1;break;
case 0x84: return 2;break;
case 0x88: return 3;break;
case 0x41: return 4;break;
case 0x42: return 5;break;
case 0x44: return 6;break;
case 0x48: return 7;break;
case 0x21: return 8;break;
case 0x22: return 9;break;
case 0x24: return 10;break;
case 0x28: return 11;break;
case 0x11: return 12;break;
case 0x12: return 13;break;
case 0x14: return 14;break;
case 0x18: return 15;
default:
break;
}
}
main()
{
uchar key;
int fb=1,sjb=0,zxb=0;
uchar f1=40,f2=200,f3=100;
RST=0;
Delay(10);
RST=1;
Delay(100);
intl240(); ///初始化必有
clear_c();
while(1)
{
key=bian(kbscan());
Write7279(0xC8,key);
switch (key)
{ case 1:if(fb==1) //1键频率加100
{f1=jiaf(f1);
P2=f1;
fangbo(f1,35);
}
else if(sjb==1)
{f2=jiaf(f2);
P2=f2;
juchibo(f2,40);
}
else {f3=jiaf(f3);
P2=f3;
zhengxian(00,64,f3,45);
}
break;
case 2:if(fb==1) //2键频率减100
{f1=jianf(f1);
P2=f1;
fangbo(f1,35);
}
else if(sjb==1)
{f2=jianf(f2);
P2=f2;
juchibo(f2,40);
}
else if(zxb==1)
{f3=jianf(f3);
P2=f3;
zhengxian(00,64,f3,45);
}
break;
case 4:fb=1;
sjb=0;
zxb=0;
P0=0x01; //201方波
fangbo(f1,35);
break;
case 5:fb=0;
sjb=1;
zxb=0;
P0=0x02; //202锯齿波
juchibo(f2,40);
break;
case 6:fb=0;
sjb=0;
zxb=1;
P0=0x03; //203正弦波
zhengxian(00,64,f3,45);
break;
case 15:clear_c();
clear_graph();
l240wc(0x9c);
default:
break;
}
}
}