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/*******************************************************************
感謝javaleilei的分享
對于之前程序過于復雜舍去了外部中斷優化了程序結構用數組替換了原來的正弦波產生函數添加了部分注釋
程序和仿真比較完美了
最終修改 BY：Pia Ji
*******************************************************************/
#include <reg51.h>
unsigned char flag=0;
sbit key1 = P3^0;
sbit key2 = P3^1;
sbit key3 = P3^2;
sbit key4 = P3^3;
unsigned char code sin_num[]={
0,0,0,0,0,0,0,0,1,1,1,1,1,2,2,2,
2,3,3,4,4,4,5,5,6,6,7,7,8,8,9,9,
10,10,11,12,12,13,14,15,15,16,17,18,18,19,20,21,
22,23,24,25,25,26,27,28,29,30,31,32,34,35,36,37,
38,39,40,41,42,44,45,46,47,49,50,51,52,54,55,56,
57,59,60,61,63,64,66,67,68,70,71,73,74,75,77,78,
80,81,83,84,86,87,89,90,92,93,95,96,98,99,101,102,
104,106,107,109,110,112, 113,115,116,118,120,121,123,124,126,128,
129,131, 132,134,135, 137, 139,140,142,143,145,146,148, 149,151,153,
154,156,157,159,160,162,163,165, 166,168,169,171,172,174,175,177,
178,180,181, 182,184,185,187,188,189,191,192,194,195,196,198,199,
200,201,203,204,205,206,208,209,210,211,213,214,215,216,217,218,
219,220,221,223,224,225,226,227,228,229,230,230,231,232,233,234,
235,236,237,237,238,239,240,240,241,242,243,243,244,245,245,246,
246,247,247,248,248,249,249,250,250,251,251, 251,252,252,253,253,
253,253,254,254,254,254,254,255,255,255,255, 255,255,255,255,255
}; //這是正弦波上升半周期的采樣
void delay(unsigned int x)//延時
{
while(--x);
}
void key_pors()//按鍵處理函數
{
if(key1==0)
flag=0;
else if(key2==0)
flag=1;
else if(key3==0)
flag=2;
else if(key4==0)
flag=3;
}
void show_wave()
{
int i;
switch(flag)
{
case 0: //三角波
for(i=0;i<255;i++)
{
P1=i;
}
for(i=255;i>0;i--)
{
P1=i;
}
break;
case 1://方波
P1=0;
delay(100);
P1=0xff;
delay(100);
break;
case 2://三角波
for(i=255;i>0;i--)
P1=i;
break;
case 3: //正弦波采用數組采樣值波形更好
for(i=0;i<255;i++)
P1=sin_num[i];
for(i=255;i>=0;i--)
P1=sin_num[i];
break;
default : P1=0;//否則為0 防錯
}
}
void main()
{
while(1)
{
key_pors();
show_wave();
}
}

復制代碼

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