我想在目前程序中加一下幅值可调的功能，s2、s3分别用来增加和减小。如果用查表法改变幅值的话是要乘一个系数，我写了一个系数数组不知道对不对，如果可以的话，具体乘上去的程序应该是什么，就是数组应该用什么表示，此外有关s2、s3键应该加在主程序的哪里。
下面是我的程序；
#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit lcdrw=P3^3;
sbit lcdrs=P3^2;
sbit lcde=P3^4;
sbit s1=P2^0; //波形
sbit s2=P2^1; //幅值+
sbit s3=P2^2; //幅值-
sbit s4=P2^3; //频率+
sbit s5=P2^4; //频率-
sbit cs=P3^5;
sbit wr=P3^6;
uchar xdata amplitude[9]={51,77,102,128,154,179,205,230,255};
uchar data index_amp=0;
uchar slnum,a,ys,j,z,i,slnun;
uint fre;
uint amp;
uchar code tosin[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};
void delay(uint_z) //延时
{
uchar i,j;
for(i=z;i>0;i--)
for(j=110;j>0;j--);
}
void delay1(uint_y)
{
uchar i,y;
for(i=y;i>0;i--) ;
}
void write_com(uchar com) //1602指令
{
lcdrs=0;
P1=com;
delay(5);
lcde=1;
delay(5);
lcde=0;
}
void write_data(uchar date) //1602数据
{
lcdrs=1;
P1=date;
delay(5);
lcde=1;
delay(5);
lcde=0;
}
void init() //lcd初始化
{
lcdrw=0;
lcde=0;
wr=0;
cs=0;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
write_com(0x80+0x00); //wave
write_data(0x77);
write_data(0x61);
write_data(0x76);
write_data(0x65);
write_data(0x3a);
write_com(0x80+0x40); //f
write_data(0x66);
write_data(0x3a);
write_com(0x80+0x00); //wave
write_data(0x77);
write_data(0x61);
}
void write_f(uchar date) //频率
{
uchar qian,bai,shi,ge;
qian=date/1000;
bai=date/100%10;
shi=date/10&10;
ge=date%10;
write_com(0x80+0x42);
write_data(0x30+qian);
write_data(0x30+bai);
write_data(0x30+shi);
write_data(0x30+ge);
write_data(0x48);
write_data(0x5a);
}
void xsf() //显示频率
{
if(slnum==1)
{
fre=(1000/(9+3*ys)) ;
write_f(fre);
}
if(slnum==2)
{
fre=(100000/(3*ys));
write_f(fre);
}
if(slnum==3)
{
fre=(1000/(15+3*ys));
write_f(fre);
}
}
void keyscanf() //键
{
if(s1==0)
{
delay(5);
if(s1==0)
{
slnum++;
while(!s1);
if(slnum==1)
{
ys=0;
write_com(0x80+0x05);
write_data(0x73);
write_data(0x69);
write_data(0x6e);
write_data(0x65);
write_data(0x20);
write_data(0x20);
}
if(slnum==2)
{
ys=10;
write_com(0x80+0x05);
write_data(0x73);
write_data(0x71);
write_data(0x75);
write_data(0x61);
write_data(0x72);
write_data(0x65);
}
if(slnum==3)
{
ys=0;
write_com(0x80+0x05);
write_data(0x74);
write_data(0x72);
write_data(0x61);
write_data(0x69);
write_data(0x6e);
write_data(0x20);
}
if(slnum==4)
{
slnum=0;
P1=0;
write_com(0x80+0x05);
write_data(0x20);
write_data(0x20);
write_data(0x20);
write_data(0x20);
write_data(0x20);
write_data(0x20);
write_com(0x80+0x42);
write_data(0x20);
write_data(0x20);
write_data(0x20);
write_data(0x20);
write_data(0x20);
write_data(0x20);
}
}
}
if(s4==0)
{
delay(5);
if(s4==0)
{
ys++;
while(!s4);
}
}
if(s5==0)
{
delay(5);
if(s5==0)
{
ys--;
while(!s5);
}
}
}
void main()
{
init();
while(1)
{
keyscanf();
if(slnum==1)
{
for(j=0;j<255;j++)
{
P0=am*tosin[j];
delay1(ys);
}
}
if(slnum==2)
{
P0=0xff;
delay1(ys);
P0=0;
delay1(ys);
}
if(slnum==3)
{
if(a<128)
{
P0=a;
delay1(ys);
}
else
{
P0=(255-a);
delay1(ys);
}
a++;
}
if(s1&s2&s3&s4&s5)
{
xsf();
}
}
}
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