日志
單片機
上網搜了一段單片機的代碼，不知道對不對，實現單片機的音樂頻譜的
程序:
#include <stc12c5a60s2.h>//"stc12c5620ad.h"
#include<intrins.h>
#define LongToBin(n) (((n>>21)&0x80)|((n>>18)&0x40)|((n>>15)&0x20)|((n>>12)&0x10)|((n>>9)&0x08)|((n>>6)&0x04)|((n>>3)&0x02)|((n)&0x01))
#define BIN(n) LongToBin(0x##n##)
#define uchar unsigned char
#define uint unsigned int
#define SAMPLE_NUM 64
#define NUM_2_LOG 6
#define FFT_OUT_MIN 3
uchar code BRTable[SAMPLE_NUM] ={ 0, 32, 16, 48, 8, 40, 24, 56,4, 36, 20, 52, 12, 44, 28, 60, 2, 34, 18, 50, 10, 42, 26, 58, 6, 38, 22, 54, 14, 46, 30, 62, 1, 33, 17, 49, 9, 41, 25, 57,5, 37, 21, 53, 13, 45, 29, 61,3, 35, 19, 51, 11, 43, 27, 59,7, 39, 23, 55, 15, 47, 31, 63};
char code sin_tabb[SAMPLE_NUM] = { 0 ,12 ,25 ,37 ,49 ,60 ,71 ,81 ,90 ,98 ,106 ,112 ,117 ,122 ,125 ,126 ,127 ,126 ,125 ,122 ,117 ,112 ,106 ,98 ,90 ,81 ,71 ,60 ,49 ,37 ,25 ,12 ,0 ,-12 ,-25 ,-37 ,-49 ,-60 ,-71 ,-81 ,-90 ,-98 ,-106 ,-112 ,-117 ,-122 ,-125 ,-126 ,-127 ,-126 ,-125 ,-122 ,-117 ,-112 ,-106 ,-98 ,-90 ,-81 ,-71 ,-60 ,-49 ,-37 ,-25 ,-12 };
char code cos_tabb[SAMPLE_NUM] = {127 ,126 ,125 ,122 ,117 ,112 ,106 ,98 ,90 ,81 ,71 ,60 ,49 ,37 ,25 ,12 ,0 ,-12 ,-25 ,-37 ,-49 ,-60 ,-71 ,-81 ,-90 ,-98 ,-106 ,-112 ,-117 ,-122 ,-125 ,-126 ,-127 ,-126 ,-125 ,-122 ,-117 ,-112 ,-106 ,-98 ,-90 ,-81 ,-71 ,-60 ,-49 ,-37 ,-25 ,-12 ,0 ,12 ,25 ,37 ,49 ,60 ,71 ,81 ,90 ,98 ,106 ,112 ,117 ,122 ,125 ,126 };
uchar a[21];
uchar keep,keepnum,anum,timernum,timernum2,lednum3,Ltime;//用于分離
/*加入數組用于顯示相應led燈數目*/
uchar lednum[]={0x00,0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff};//0-7的顯示數組 P2組控制
int xdata FftReal[SAMPLE_NUM];
int xdata FftImage[SAMPLE_NUM];
sbit p30=P3^0;
sbit p31=P3^1;
sbit p32=P3^2;
sbit p33=P3^3;
sbit p34=P3^4;
sbit p35=P3^5;//9-11的led控制
sbit p36=P3^6;
sbit p37=P3^7;
void timerinit()//定時器 初始化函數
{
TMOD=0x01;
TH0=(65536-6000)/256;
TL0=(65536-6000)%256;
EA=1;
ET0=1;
TR0=1;
}
void disp()
{
timernum++;
if(timernum==6) timernum=1;
P2=0;//顯示前先關閉
P3=P3&0x1f;
switch(timernum)
{
case 1:anum=a[0];p34=0;p33=1;p32=1;p31=1;p30=1;break;
case 2:anum=a[1];p34=1;p33=0;p32=1;p31=1;p30=1;break;
case 3:anum=a[2];p34=1;p33=1;p32=0;p31=1;p30=1;break;
case 4:anum=a[3];p34=1;p33=1;p32=1;p31=0;p30=1;break;
case 5:anum=a[4];p34=1;p33=1;p32=1;p31=1;p30=0;break;
}
//anum=a[10];/*修改可以改變光柱高度 （anum值分開幾個部分用定時器區分顯示）(a[]內逐加) */
if(anum<=8){P2=lednum[anum];P3=P3&0xff;}//屏蔽高三位 1f
//else {P2=0xff;P3=lednum2[anum-9];}
if(anum==9){P2=0xff;p35=1;p36=0;p37=0;}
if(anum==10){P2=0xff;p35=1;p36=1;p37=0;}
if(anum==11){P2=0xff;p35=1;p36=1;p37=1;}
}
uchar STC_ADC() //！！根據數據手冊寫一個ad讀取函數
{
uchar i;
ADC_RES = 0;
ADC_RESL = 0;
ADC_CONTR = BIN(10001000);
i=3;
while(i--);
while (1)
{
if (ADC_CONTR & BIN(10000))
{
break;
}
}
ADC_CONTR = BIN(10000000);
return( ADC_RESL<<2) ;
}
short sqrt_16( unsigned long M)
{
unsigned int N, i;
unsigned long tmp, ttp;
if( M == 0 )
return 0;
N = 0;
tmp = ( M >> 30 );
M <<= 2;
if( tmp > 1 )
{
N ++;
tmp -= N;
}
for( i=15; i>0; i-- )
{
N <<= 1;
tmp <<= 2;
tmp += (M >> 30);
ttp = N;
ttp = (ttp<<1)+1;
M <<= 2;
if( tmp >= ttp )
{
tmp -= ttp;
N ++;
}
}
return N;
}
void FFT()
{
register uchar i,bb,j,k,p,max;
register short TR,TI,temp;
unsigned long ulReal;
unsigned long ulImage;
for(i=0; i<SAMPLE_NUM;i++) //此處可以加入自動增益
{
FftReal[BRTable[i]] = STC_ADC()<<keep;//使顯示保持在一定范圍內
FftImage[i] = 0;
}
keepnum=FftReal[2]/32;//提取等級數
if((7<keepnum)&&(keepnum<=8)) {keep=1;}
else if((4<keepnum)&&(keepnum<=6)) {keep=2;}
else if((2<keepnum)&&(keepnum<=4)) {keep=3;}
else {keep=5;}
for( i=1; i<=NUM_2_LOG; i++)
{
bb=1;
bb <<= (i-1);
for( j=0; j<=bb-1; j++)
{
p=1;
p <<= (NUM_2_LOG-i);
p = p*j;
for( k=j; k<SAMPLE_NUM; k=k+2*bb)
{
TR = FftReal[k]; TI = FftImage[k]; temp = FftReal[k+bb];
FftReal[k] = FftReal[k] + ((FftReal[k+bb]*cos_tabb[p])>>7) + ((FftImage[k+bb]*sin_tabb[p])>>7);
FftImage[k] = FftImage[k] - ((FftReal[k+bb]*sin_tabb[p])>>7) + ((FftImage[k+bb]*cos_tabb[p])>>7);
FftReal[k+bb] = TR - ((FftReal[k+bb]*cos_tabb[p])>>7) - ((FftImage[k+bb]*sin_tabb[p])>>7);
FftImage[k+bb] = TI + ((temp*sin_tabb[p])>>7) - ((FftImage[k+bb]*cos_tabb[p])>>7);
FftReal[k] >>= 1;
FftImage[k] >>= 1;
FftReal[k+bb] >>= 1;
FftImage[k+bb] >>= 1;
}
}
}
max=0;
for( i=0; i<5; i++)//5
{
ulReal = FftReal[i+1];
ulReal *= ulReal;
ulImage = FftImage[i+1];
ulImage *= ulImage;
a[i] = sqrt_16( ulReal + ulImage ); //修改
if( a[i] < FFT_OUT_MIN )
a[i] = 0;//修改
else
a[i] = a[i]-FFT_OUT_MIN;
if( a[i] >max)
max =a[i];
//disp();
}
if(max>11) //11
{
max/=11;
for( i=0; i<5; i++) //輸出a的5個分離數值
{
a[i]/=max;
}
}
}
void main()
{
P2M0=0xff;// BIN(11111111);//P2組設置為推挽輸出
P2M1=0;
P3M0=0xe0;// BIN(11111111);
P3M1=0;
P1M0=0x00;
P1M1=0x01;
P1ASF =1; //設置P1.0為AD口
AUXR1 =BIN(100);
keep=0;
keepnum=0;
timerinit();//定時器初始化
timernum=3;//從3開始
timernum2=0;
while(1)
{
FFT();
}
}
void timer0() interrupt 1
{
TH0=(65536-6000)/256; //6000
TL0=(65536-6000)%256;
disp();
}
