#include <reg52.h>
#define ulong unsigned long
#define uint unsigned int
#define uchar unsigned char
#define DAC0800 P0 //DAC0800數據總線接P3
uchar code led[]={ 0xfc,0x60,0xda,0xf2,0x66,0xb6,0xbe,0xe0,
0xfe,0xf6,0xee,0x3e,0x9c,0x7a,0x9e,0x8e,0x00 }; //數碼管碼表
uchar code scan[]={ 0xf7,0xfb,0xfd,0xfe }; //鍵盤行掃描碼
uchar code sin[256]=
{ 127,130,133,136,139,143,146,149,152,155,158,161,164,167,170,173,
176,179,182,184,187,190,193,195,198,200,203,205,208,210,213,215,
217,219,221,224,226,228,229,231,233,235,236,238,239,241,242,244,
245,246,247,248,249,250,251,251,252,253,253,254,254,254,254,254,
254,254,254,254,254,254,253,253,252,251,251,250,249,248,247,246,
245,244,242,241,239,238,236,235,233,231,229,228,226,224,221,219,
217,215,213,210,208,205,203,200,198,195,193,190,187,184,182,179,
176,173,170,167,164,161,158,155,152,149,146,143,139,136,133,130,
127,124,121,118,115,111,108,105,102,99,96,93,90,87,84,81,
78,75,72,70,67,64,61,59,56,54,51,49,46,44,41,39,
37,35,33,30,28,26,25,23,21,19,18,16,15,13,12,10,
9,8,7,6,5,4,3,3,2,1,1,0,0,0,0,0,
0,0,0,0,0,0,1,1,2,3,3,4,5,6,7,8,
9,10,12,13,15,16,18,19,21,23,25,26,28,30,33,35,
37,39,41,44,46,49,51,54,56,59,61,64,67,70,72,75,
78,81,84,87,90,93,96,99,102,105,108,111,115,118,121,124 };
uchar disp[4]={16,16,16,16}; //數碼管顯示緩沖區
//數碼管位選接P1低四位，段選接P0
//鍵盤接P2
sbit LOCK=P1^4; //74573鎖存端
uchar keyval=16; //鍵值
uchar keydigitcount=0; //數字鍵計數
uchar keyselcount=0; //選擇鍵計數
uint x,freq; //頻率參數
void Delay(uint x);
void Display();
void Keyscan();
void Keydisp();
void RecWave(uchar t);
void ZigWave(uint t);
void TriWave(uchar t);
void SinWave(uchar t);
/*------------------ 主函數 --------------------*/
void main()
{
x = 0;
freq = 2;
while(1)
{
Display(); //調用數碼管顯示函數
// Keyscan(); //調用鍵盤掃描函數
TriWave(2);
}
}
/*------------------ 方波產生 ------------------*/
void RecWave(uchar t)
{
uchar i;
DAC0800 = 0xff;
for(i=0;i<255;i++)
Delay(t);
DAC0800 = 0x00;
for(i=0;i<255;i++)
Delay(t);
}
/*----------------- 鋸齒波產生 -----------------*/
void ZigWave(uint t)
{
uchar i;
for(i=0;i<255;i++)
{
DAC0800 = i;
Delay(t);
}
DAC0800=255;
Delay(t);
}
/*----------------- 三角波產生 -----------------*/
void TriWave(uchar t)
{
uchar i;
for(i=0;i<255;i++)
{
DAC0800 = i;
Delay(t);
}
for(i=255;i>0;i--)
{
DAC0800 = i;
Delay(t);
}
}
/*----------------- 正弦波產生 -----------------*/
void SinWave(uchar t)
{
uchar i;
for(i=0;i<255;i++)
{
DAC0800 = sin[i];
Delay(t);
}
DAC0800=124;
Delay(t);
}
/*-------------------- 延時 --------------------*/
void Delay(uint x)
{
uint i;
for(i=x;i>0;i--);
}
/*----------------- 數碼管顯示 -----------------*/
void Display()
{
uchar i,j;
j=0x08;
for(i=0;i<4;i++)
{
P1=j; //數碼管位碼輸出
LOCK=1; //打開鎖存
P0=led[disp[i]]; //數碼管段碼輸出
LOCK=0; //關閉鎖存
j=j>>1; //調整位碼
Delay(125);
P0=0x00;
}
}
/*------------------ 鍵盤掃描 ------------------*/
void Keyscan()
{
uchar col,i;
P2=0xf0; //行線輸出全低
col=P2&0xf0;
if(col==0xf0) return; //無鍵，返回
Delay(20); //延時消抖
P2=0xf0; //重新檢測有鍵按下否
col=P2&0xf0;
if(col==0xf0) return; //無鍵，返回
switch(col) //判斷按鍵所在的列
{
case 0xe0: keyval=0; break;
case 0xd0: keyval=1; break;
case 0xb0: keyval=2; break;
case 0x70: keyval=3; break;
}
for(i=0;i<4;i++)
{
P2=scan[i]; //輸出鍵盤掃描碼
col=P2&0xf0;
if(col!=0xf0) break; //有鍵按下
}
keyval+=i*4; //計算鍵值
while(col!=0xf0) //等待按鍵松開
{
Display();
col=P2&0xf0;
}
Keydisp(); //調用鍵盤處理函數
}
/*------------------ 鍵盤處理 ------------------*/
void Keydisp()
{
if(keyval==10) //選擇鍵處理
{
keyselcount++;
switch(keyselcount) //選擇信號波形
{
case 1:
RecWave(freq); //調用方波產生函數
break;
case 2:
ZigWave(freq); //調用鋸齒波產生函數
break;
case 3:
TriWave(freq); //調用三角波產生函數
break;
case 4:
SinWave(freq); //調用正弦波產生函數
break;
}
if(keyselcount==4) keyselcount=1;
}
if(keyval<10) //數字鍵處理
{
keydigitcount++;
disp[keydigitcount-1] = keyval;
x = x*10 + x; //計算信號頻率
if(keydigitcount==4)
{
keydigitcount=1;
freq = x;
x = 0;
}
}
}
如何轉換
