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#include<reg52.h> //stc15系列1T單片機
#define ADC_CHANNEL 0x01 //AD轉換通道P1.0
#define ADC_POWER 0x80 //ADC電源控制位
#define ADC_SPEED 0x60 //90個時鐘周期
#define ADC_START 0x08 //ADC啟動控制位
#define ADC_FLAG 0x10 //ADC完成標志位
#define SAMPLE_NUM 64 //取64點FFT算法
#define NUM_2_LOG 6 //2的6次方
#define FFT_OUT_MIN 1 //FFT運算最小值
#define LED_C1_8 P2 //LED1~8列
#define LED_C9_16 P3 //LED9~16列
#define LED_R1_8 P0 //LED1~8行
/***************************引腳定義*****************************/
sbit LED_R1 = P0^0; //LED1~8行
sbit LED_R2 = P0^1;
sbit LED_R3 = P0^2;
sbit LED_R4 = P0^3;
sbit LED_R5 = P0^4;
sbit LED_R6 = P0^5;
sbit LED_R7 = P0^6;
sbit LED_R8 = P0^7;
sbit LED_R9 = P1^6; //LED第9行
sbit LED_R10 = P1^7; //LED第10行
sbit SWITCH = P2^5;
/*----------------------------變量表----------------------------*/
unsigned char code BIT_RESORT[SAMPLE_NUM] = { 0, 32, 16, 48, 8, 40, 24, 56,4, 36, 20, 52, 12, 44, 28, 60, //比特逆序重排
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_TAB[SAMPLE_NUM] = { 0 ,12 ,25 ,37 ,49 ,60 ,71 ,81 ,90 ,98 ,106 ,112 ,117 ,122 ,125 ,126 , //正弦表
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_TAB[SAMPLE_NUM] = {127 ,126 ,125 ,122 ,117 ,112 ,106 ,98 ,90 ,81 ,71 ,60 ,49 ,37 ,25 ,12 , //余弦表
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 };
unsigned char LED_NUM[] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff}; //led顯示數目
unsigned char AMP, AMP_TAB[16]; //頻譜幅值，幅值表
unsigned char DISP_NUM; //顯示次數
unsigned char KEEP, KEEP_NUM; //自動增益選擇
int xdata FFT_REAL[SAMPLE_NUM]; //FFT運算結果實部
int xdata FFT_IMAGE[SAMPLE_NUM]; //FFT運算結果虛部
bit SWITCH_ON;
/**************************************************************
*名稱：delay
*功能：微秒級延時
**************************************************************/
void Delay(unsigned int i)
{
while(i--);
}
/**************************************************************
*名稱：Delay_ms
*功能：毫秒級延時
**************************************************************/
void Delay_ms(unsigned int x)
{
unsigned int i, j;
for(i = 0; i < x; i++)
for(j = 0; j < 500; j++);
}
/**************************************************************
*名稱：IOInit
*功能：IO端口初始化
**************************************************************/
void IOInit(void)
{
P1M0 = 0x00; //高阻輸入
P1M1 = 0x01;
P1ASF = 0x01; //設為AD轉換
}
/**************************************************************
*名稱：Timer0Init
*功能：定時器0初始化100us定時
**************************************************************/
void TimerInit(void) //100微秒@33.000MHz
{
AUXR = 0XC0; //定時器0-1T，定時器1-12T
TMOD = 0X00; //定時器0/1-方式0-16位自動重裝
TL0 = 0X16; //定時器0-定時170us-顯示幅值
TH0 = 0Xea;
TL1 = 0X1C; //定時器1-定時1ms-檢測開關狀態
TH1 = 0XF3;
TR0=1;
TR1 = 1;
}
/**********************************************************
*名稱：Display
*功能：顯示幅值
**********************************************************/
void Display(void)
{
DISP_NUM++;
if(DISP_NUM == 17)
DISP_NUM = 1;
LED_R1_8 = 0X00; LED_R9 = 0; LED_R10 = 0; LED_R11 = 0; LED_R12 = 0; //顯示前先關閉
switch(DISP_NUM) //逐列顯示
{
case 1: AMP = AMP_TAB[0]; LED_C1_8 = 0X01; LED_C9_16 = 0x00; break;
case 2: AMP = AMP_TAB[1]; LED_C1_8 = 0X02; LED_C9_16 = 0x00; break;
case 3: AMP = AMP_TAB[2]; LED_C1_8 = 0X04; LED_C9_16 = 0x00; break;
case 4: AMP = AMP_TAB[3]; LED_C1_8 = 0X08; LED_C9_16 = 0x00; break;
case 5: AMP = AMP_TAB[4]; LED_C1_8 = 0X10; LED_C9_16 = 0x00; break;
case 6: AMP = AMP_TAB[5]; LED_C1_8 = 0X20; LED_C9_16 = 0x00; break;
case 7: AMP = AMP_TAB[6]; LED_C1_8 = 0X40; LED_C9_16 = 0x00; break;
case 8: AMP = AMP_TAB[7]; LED_C1_8 = 0X80; LED_C9_16 = 0x00; break;
case 9: AMP = AMP_TAB[8]; LED_C1_8 = 0X00; LED_C9_16 = 0x01; break;
case 10: AMP = AMP_TAB[9]; LED_C1_8 = 0X00; LED_C9_16 = 0x02; break;
case 11: AMP = AMP_TAB[10]; LED_C1_8 = 0X00; LED_C9_16 = 0x04; break;
case 12: AMP = AMP_TAB[11]; LED_C1_8 = 0X00; LED_C9_16 = 0x08; break;
case 13: AMP = AMP_TAB[12]; LED_C1_8 = 0X00; LED_C9_16 = 0x10; break;
case 14: AMP = AMP_TAB[13]; LED_C1_8 = 0X00; LED_C9_16 = 0x20; break;
case 15: AMP = AMP_TAB[14]; LED_C1_8 = 0X00; LED_C9_16 = 0x40; break;
case 16: AMP = AMP_TAB[15]; LED_C1_8 = 0X00; LED_C9_16 = 0x80; break;
}
if(AMP <= 8)
{
LED_R1_8 = LED_NUM[AMP];
LED_R9 = 0;
LED_R10 = 0;
LED_R11 = 0;
LED_R12 = 0;
}
if(AMP == 9)
{
LED_R1_8 = 0XFF;
LED_R9 = 1;
LED_R10 = 0;
LED_R11 = 0;
LED_R12 = 0;
}
if(AMP == 10)
{
LED_R1_8 = 0XFF;
LED_R9 = 1;
LED_R10 = 1;
LED_R11 = 0;
LED_R12 = 0;
}
if(AMP == 11)
{
LED_R1_8 = 0XFF;
LED_R9 = 1;
LED_R10 = 1;
LED_R11 = 1;
LED_R12 = 0;
}
if(AMP == 12)
{
LED_R1_8 = 0XFF;
LED_R9 = 1;
LED_R10 = 1;
LED_R11 = 1;
LED_R12 = 1;
}
}
/************************************************
*名稱：ReadADC
*功能：讀取AD轉換結果
************************************************/
unsigned char ReadADC(void)
{
ADC_CONTR = ADC_POWER + ADC_START; //啟動轉換
Delay(50);
while(!(ADC_CONTR & ADC_FLAG)); //等待轉換結束
ADC_CONTR = ADC_POWER;
return (ADC_RES << 2 + ADC_RESL);
}
/************************************************
*名稱：sqrt
*功能：算平方根
************************************************/
short sqrt( unsigned long M) //不懂啊
{
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;
}
/************************************************
*名稱：FFT
*功能：快速傅里葉變換求取頻譜
************************************************/
void FFT(void) //基2時分蝶式算法
{
// unsigned char i, j, r, m1, m2, m3, m4, k1, k2; //分別為：級號，蝶群號，運算蝶號，蝶群總數，蝶群長度，運算蝶數，蝶群址，蝶址
// unsigned char p;
// unsigned char MAX = 0;
// short u, v;
// unsigned long ulReal, ulImage;
register unsigned char i,bb,j,k,p,MAX;
register short TR,TI,temp;
unsigned long ulReal;
unsigned long ulImage;
for(i = 0; i < SAMPLE_NUM; i++) //采樣
{
FFT_REAL[BIT_RESORT[i]] = ReadADC() << KEEP;
FFT_IMAGE[i] = 0;
}
KEEP_NUM = FFT_REAL[2] >> 4;
if((7 < KEEP_NUM) && (KEEP_NUM <= 8))
KEEP = 1;
else if((4 < KEEP_NUM) && (KEEP_NUM <= 6))
KEEP = 2;
else if((2 < KEEP_NUM) && (KEEP_NUM <= 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 = FFT_REAL[k]; TI = FFT_IMAGE[k]; temp = FFT_REAL[k+bb];
FFT_REAL[k] = FFT_REAL[k] + ((FFT_REAL[k+bb]*COS_TAB[p])>>7) + ((FFT_IMAGE[k+bb]*SIN_TAB[p])>>7);
FFT_IMAGE[k] = FFT_IMAGE[k] - ((FFT_REAL[k+bb]*SIN_TAB[p])>>7) + ((FFT_IMAGE[k+bb]*COS_TAB[p])>>7);
FFT_REAL[k+bb] = TR - ((FFT_REAL[k+bb]*COS_TAB[p])>>7) - ((FFT_IMAGE[k+bb]*SIN_TAB[p])>>7);
FFT_IMAGE[k+bb] = TI + ((temp*SIN_TAB[p])>>7) - ((FFT_IMAGE[k+bb]*COS_TAB[p])>>7);
FFT_REAL[k] >>= 1;
FFT_IMAGE[k] >>= 1;
FFT_REAL[k+bb] >>= 1;
FFT_IMAGE[k+bb] >>= 1;
}
}
}
for(i = 0; i < 16; i++)
{
ulReal = FFT_REAL[i + 1];
ulReal *= ulReal;
ulImage = FFT_IMAGE[i + 1];
ulImage *= ulImage;
AMP_TAB[i] = sqrt(ulImage + ulReal);
if(AMP_TAB[i] < FFT_OUT_MIN)
AMP_TAB[i] = 0;
else
AMP_TAB[i] -= FFT_OUT_MIN;
if(AMP_TAB[i] > MAX)
MAX = AMP_TAB[i];
}
if(MAX > 12)
{
MAX /= 12;
for(i = 0; i < 16; i++)
AMP_TAB[i] /= MAX;
}
}
/************************************************
*名稱：main
*功能：主函數
************************************************/
void main()
{
IOInit(); //初始化
TimerInit();
DISP_NUM = 0;
KEEP = 0;
KEEP_NUM = 0;
EA = 1; //開中斷
ET1 = 1;
while(1)
{
if(SWITCH_ON == 0)
{
ET0 = 0;
}
if(SWITCH_ON == 1)
{
ET0 = 1;
FFT();
}
}
}
/************************************************
*名稱：Timer0Interrupt
*功能：定時器0中斷服務程序-顯示
************************************************/
void Timer0Interrupt() interrupt 1
{
Display();
Delay(300);
}
/************************************************
*名稱：Timer1Interrupt
*功能：定時器1中斷服務程序-檢測開關狀態
************************************************/
void Timer1Interrupt() interrupt 3
{
if(SWITCH == 1)
SWITCH_ON = 1;
if(SWITCH == 0)
SWITCH_ON = 0;
}

復制代碼

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