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/********************************************************************************
;* File:FFT v1.0 *
;* Date:2015-10-22 *
;* Version:1.0 *
;* Author:Ben *
;* Wechat:feeling1791 *
;********************************************************************************/
/*
// Configuration Mask Definitions
#define CONFIG_ADDR 0x2007
// Oscillator
#define EXTCLK 0x3FFF // External RC Clockout
#define EXTIO 0x3FFE // External RC No Clock
#define INTCLK 0x3FFD // Internal RC Clockout
#define INTIO 0x3FFC // Internal RC No Clock
#define EC 0x3FFB // EC
#define HS 0x3FFA // HS
#define XT 0x3FF9 // XT
#define LP 0x3FF8 // LP
// Watchdog Timer
#define WDTEN 0x3FFF // On
#define WDTDIS 0x3FF7 // Disabled / SWDTEN control
// Power Up Timer
#define PWRTDIS 0x3FFF // Off
#define PWRTEN 0x3FEF // On
// Master Clear Enable
#define MCLREN 0x3FFF // MCLR function is enabled
#define MCLRDIS 0x3FDF // MCLR functions as IO
// Code Protect
#define UNPROTECT 0x3FFF // Code is not protected
#define CP 0x3FBF // Code is protected
// Data EE Read Protect
#define DUNPROTECT 0x3FFF // Do not read protect EEPROM data
#define CPD 0x3F7F // Read protect EEPROM data
// Brown Out Detect
#define BORDIS 0x3CFF // BOD and SBOREN disabled
#define SWBOREN 0x3DFF // SBOREN controls BOR function (Software control)
#define BORXSLP 0x3EFF // BOD enabled in run, disabled in sleep, SBOREN disabled
#define BOREN 0x3FFF // BOD Enabled, SBOREN Disabled
// Internal External Switch Over Mode
#define IESOEN 0x3FFF // Enabled
#define IESODIS 0x3BFF // Disabled
// Monitor Clock Fail-safe
#define FCMEN 0x3FFF // Enabled
#define FCMDIS 0x37FF // Disabled
// Low Voltage Programming
#define LVPDIS 0x2FFF // Disabled
#define LVPEN 0x3FFF // Enabled
// In-Circuit Debugger Mode
#define DEBUGEN 0x1FFF // Enable ICD2 debugging
#define DEBUGDIS 0x3FFF // Disable ICD2 debugging
#define CONFIG_ADDR2 0x2008
// Brown-out Reset Voltage
#define BORV21 0x3EFF // 2.1 Volts
#define BORV40 0x3FFF // 4.0 Volts
// Flash Memory Write Protection
#define WP0 0x3DFF // Protect 0h-0FFh
#define WP1 0x3BFF // Protect lower half of flash
#define WP2 0x39FF // Protect all of flash
*/
#include <pic.h> //pic16f887
__CONFIG(INTIO&WDTDIS&PWRTDIS&MCLREN&BOREN&LVPDIS&DUNPROTECT&DEBUGDIS&UNPROTECT&IESOEN&FCMEN);
#define LOG_NUMBER 5
unsigned char AD_count;
const unsigned char BRTable[32] = {0,16,8,24,4,20,12,28,2,18,10,26,6,22,14,30,
1,17,9,25,5,21,13,29,3,19,11,27,7,23,15,31};
const char SIN_TAB[32] =
{ 0 ,25 ,49 ,71 ,90 ,106 ,117 ,125 ,127 ,
125 ,117 ,106 ,90 ,71 ,49 ,25 ,0 ,
-25 ,-49 ,-71 ,-90 ,-106 ,-117 ,-125 ,-127 ,
-125 ,-117 ,-106 ,-90 ,-71 ,-49 ,-25 };
const char COS_TAB[32] =
{127 ,125 ,117 ,106 ,90 ,71 ,49 ,25 ,0 ,
-25 ,-49 ,-71 ,-90 ,-106 ,-117 ,-125 ,-127 ,
-125 ,-117 ,-106 ,-90 ,-71 ,-49 ,-25 ,0 ,
25 ,49 ,71 ,90 ,106 ,117 ,125 };
unsigned char disp_time;
unsigned char Led_scan_count;
bit AD_readed_flag = 0;
bit AD_getonce_flag = 0;
bank3 const unsigned char Disp_Number[8]={0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff};//0-7
bank3 const unsigned char Disp_peak[8]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};//0-7
bank3 unsigned char led_num[16];
bank2 unsigned char MAIN_TAB[16];
bank1 unsigned char PEAK_TAB[16];
bank3 unsigned char Peak_speed[16];
bank1 int Fft_Real[32];
bank2 int Fft_Image[32];
unsigned int FFT_value;
/********************************************************************/
void delay_1ms(void)
{
unsigned int i;
for(i = 0;i < 65;i++);
}
void delay_ms(unsigned int n)
{
unsigned int i;
for(i = 0;i < n;i++)
{
delay_1ms();
}
}
/********************************************************************/
void disp(void) //2ms scan 16 segment
{
PORTD = 0xff;
PORTC = 0xff;
switch(Led_scan_count)
{
case 1:
PORTB = led_num[0] ;
RD0 = 0;
break;
case 2:
PORTB = led_num[1];
RD1 = 0;
break;
case 3:
PORTB = led_num[2] ;
RD2=0;
break;
case 4:
PORTB = led_num[3];
RD3 = 0;
break;
case 5:
PORTB = led_num[4];
RD4 = 0;
break;
case 6:
PORTB = led_num[5];
RD5 = 0;
break;
case 7:
PORTB = led_num[6];
RD6 = 0;
break;
case 8:
PORTB = led_num[7];
RD7 = 0;
break;
case 9:
PORTB = led_num[8];
RC0 = 0;
break;
case 10:
PORTB = led_num[9];
RC1 = 0;
break;
case 11:
PORTB = led_num[10];
RC2 = 0;
break;
case 12:
PORTB = led_num[11];
RC3 = 0;
break;
case 13:
PORTB = led_num[12];
RC4 = 0;
break;
case 14:
PORTB = led_num[13];
RC5 = 0;
break;
case 15:
PORTB = led_num[14];
RC6 = 0;
break;
case 16:
PORTB = led_num[15];
RC7 = 0;
break;
}
}
/********************************************************************/
void FFT(void)
{
unsigned char i,b,j,k,p;
int Temp_Real,Temp_Imag,temp;
for( i = 1; i <= LOG_NUMBER; i++) /* for(1) */
{
b = 1;
b <<= (i-1);
for( j = 0; j <= b-1; j++) /* for (2) */
{
p = 1;
p <<= (LOG_NUMBER-i);
p = p*j;
for( k = j; k < 32; k = k + 2*b) /* for (3) */
{
Temp_Real = Fft_Real[k];
Temp_Imag = Fft_Image[k];
temp = Fft_Real[k+b];
Fft_Real[k] = Fft_Real[k] + ((Fft_Real[k+b]*COS_TAB[p])>>7) + ((Fft_Image[k+b]*SIN_TAB[p])>>7);
Fft_Image[k] = Fft_Image[k] - ((Fft_Real[k+b]*SIN_TAB[p])>>7) + ((Fft_Image[k+b]*COS_TAB[p])>>7);
Fft_Real[k+b] = Temp_Real - ((Fft_Real[k+b]*COS_TAB[p])>>7) - ((Fft_Image[k+b]*SIN_TAB[p])>>7);
Fft_Image[k+b] = Temp_Imag + ((temp*SIN_TAB[p])>>7) - ((Fft_Image[k+b]*COS_TAB[p])>>7);
Fft_Real[k] >>= 1;
Fft_Image[k] >>= 1;
Fft_Real[k+b] >>= 1;
Fft_Image[k+b] >>= 1;
}
}
}
for( j=0; j<16; j++)//16 frequency division
{
FFT_value=((((Fft_Real[j]* Fft_Real[j]))+((Fft_Image[j]*Fft_Image[j]))));
if(FFT_value < 4)
FFT_value=0;
else if(FFT_value < 16)
FFT_value=1;
else if(FFT_value < 36)
FFT_value=2;
else if(FFT_value < 64)
FFT_value=3;
else if(FFT_value < 100)
FFT_value=4;
else if(FFT_value < 144)
FFT_value=5;
else if(FFT_value < 196)
FFT_value=6;
else if(FFT_value < 256)
FFT_value=7;
else FFT_value=7;
/*
if(FFT_value < 9)
FFT_value=0;
else if(FFT_value < 25)
FFT_value=1;
else if(FFT_value < 49)
FFT_value=2;
else if(FFT_value < 81)
FFT_value=3;
else if(FFT_value < 121)
FFT_value=4;
else if(FFT_value < 169)
FFT_value=5;
else if(FFT_value < 225)
FFT_value=6;
else if(FFT_value < 289)
FFT_value=7;
else FFT_value=7;
*/
if(FFT_value > (MAIN_TAB[j]))
{
MAIN_TAB[j] = FFT_value;
}
if(FFT_value > (PEAK_TAB[j]))
{
PEAK_TAB[j] = FFT_value;
Peak_speed[j] = 12; //peak keep time
}
}
}
void FFT_Process(void)
{
unsigned char k;
if(AD_getonce_flag == 1)
{
TMR2IE = 0;
AD_getonce_flag = 0;
GODONE = 1;
while( GODONE == 1);
//AD_VALUE = (((unsigned int)ADRESH<<8)+ADRESL);
Fft_Real[BRTable[AD_count]] = (((unsigned int)ADRESH<<8)+ADRESL);
AD_count++;
if(AD_count >= 32)
{
AD_count= 0 ;
AD_readed_flag = 1;
}
else
{
TMR2 = 0x00;
TMR2IE = 1;
}
}
if(AD_readed_flag == 1)
{
for(k = 0;k < 32;k++)
{
Fft_Image[k] = 0;
}
FFT();
AD_readed_flag = 0;
TMR2 = 0x00;
TMR2IE = 1;
}
}
/*******************************************************************************************************/
void TMR0_Init(void)
{
OSCCON = 0B01110111; // set timer0 as 8MS
// "NC"----IRCF2----IRCF1----IRCF0----OSTS----HTS----LTS----SCS
// IRCF<2:0> dis SCS = 1 --->inside
TMR0 = 256 - 250; // 0.5us *250 *16 = 2ms
// /RBPU INTEDG T0CS T0SE PSA PS2 PS1 PS0
OPTION = 0B00000011; // timer0,1:16 *16 = 2ms
INTCON |= 0B10100000; //INT register: GIE----PEIE----T0IE----INTE----RBIE----T0IF----INTF----RBIF
}
/********************************************************************/
void ADC_init(void)
{
TRISA0 =1; //set it to input
//ANS0 = 1;
ANSEL = 0B01110001; //set AN0 to analog;
ADCON0 = 0B10000001; //fosc/2,AN0 on,adc enable
// adcs1 adcs0 chs3 chs2 chs1 chs0 go/done adon
//ADCS1 = 1; //INIT 500k/8 62KHz/32point
//ADCS0 = 0;
//ADCON1 = 0B10000000; //vdd & vss as vref
VCFG0 = 0; //VSS
VCFG1 = 0; //VDD
ADFM = 1; // AD result right justified
//ADON = 1;
//ADIE = 1;
//GODONE = 1;
PEIE = 1;
GIE = 1;
}
/*
void TMR1_Init(void)
{
//T1CON = 0X01; //T1GINV TMR1GE T1CKPS1 T1CKPS0 T1OSCEN /T1SYNC TMR1CS TMR1ON
TMR1CS = 0; //inside Fosc / 4
TMR1ON = 1; //enable timer1
T1CKPS0 = 0; //1:1
T1CKPS0 = 0;
TMR1IE = 1;
TMR1IF = 0;
TMR1H = 0XFF;
TMR1L = 0XE7; //65535-25= 0XFFe7 0.025MS 4M/4
PEIE = 1;
GIE = 1;
}
*/
void PORT_Init(void)
{
TRISB = 0x00;
TRISC = 0x00;
TRISD = 0x00;
TRISE = 0X00;
}
void TMR2_Init(void)
{
T2CON = 0x00; //postscale 1:1
TMR2ON=1;
PR2 = 0xff; //30*0.25us +step = 25us
TMR2 = 256-36;
TMR2IE = 1;
TMR2IF = 0;
//PEIE = 1;
//GIE = 1;
}
void init(void)
{
PORT_Init();
TMR0_Init();
ADC_init();
//TMR1_Init();
TMR2_Init();
}
void interrupt ISR(void)
{
unsigned char j;
if(TMR2IF && TMR2IE) //25us
{
TMR2IF = 0;
TMR2 = 256-36;
AD_getonce_flag = 1;
}
if(T0IF && T0IE) //2ms
{
TMR0= 256 - 250;
T0IF=0;
Led_scan_count++; //2ms
if(Led_scan_count > 16)
……………………
…………限于本文篇幅余下代碼請從51黑下載附件…………

復制代碼

#include<STC12C5A60S2.H>
typedef unsigned char uint8;
typedef unsigned int uint16;
#define channel 0x01 //設置AD通道為 P1.0
#define ADC_POWER (1<<7)
#define ADC_SPEEDHH (0x03<<5)
#define ADC_START (1<<3)
#define PADCH (1<<5)
#define ADC_FLAG (1<<4)
#define P_3 P3 //32列掃描控制
sbit sw=P1^2;//74HC154組切換控制位
//放大128倍后的sin整數表（128）
code char SIN_TAB[128]={0,6,12,18,24,30,36,42,48,54,59,65,70,75,80,85,89,94,98,102,
105,108,112,114,117,119,121,123,124,125,126,126,126,126,126,
125,124,123,121,119,117,114,112,108,105,102,98,94,89,85,80,75,
70,65,59,54,48,42,36,30,24,18,12,6,0,-6,-12,-18,-24,-30,-36,-42,
-48,-54,-59,-65,-70,-75,-80,-85,-89,-94,-98,-102,-105,-108,-112,
-114,-117,-119,-121,-123,-124,-125,-126,-126,-126,-126,-126,-125,
-124,-123,-121,-119,-117,-114,-112,-108,-105,-102,-98,-94,-89,-85,
-80,-75,-70,-65,-59,-54,-48,-42,-36,-30,-24,-18,-12,-6};
//放大128倍后的cos整數表（128）
code char COS_TAB[128]={127,126,126,125,124,123,121,119,117,114,112,108,105,102,98,94,
89,85,80,75,70,65,59,54,48,42,36,30,24,18,12,6,0,-6,-12,-18,-24,
-30,-36,-42,-48,-54,-59,-65,-70,-75,-80,-85,-89,-94,-98,-102,
-105,-108,-112,-114,-117,-119,-121,-123,-124,-125,-126,-126,-126,
-126,-126,-125,-124,-123,-121,-119,-117,-114,-112,-108,-105,-102,
-98,-94,-89,-85,-80,-75,-70,-65,-59,-54,-48,-42,-36,-30,-24,-18,
-12,-6,0,6,12,18,24,30,36,42,48,54,59,65,70,75,80,85,89,94,98,102,
105,108,112,114,117,119,121,123,124,125,126,126};
//采樣存儲序列表
code char LIST_TAB[128] = {0,64,32,96,16,80,48,112,8,72,40,104,24,88,56,120,4,68,36,100,20,84,52,116,
12,76,44,108,28,92,60,124,2,66,34,98,18,82,50,114,10,74,42,106,26,90,58,
122,6,70,38,102,22,86,54,118,14,78,46,110,30,94,62,126,1,65,33,97,17,81,49,
113,9,73,41,105,25,89,57,121,5,69,37,101,21,85,53,117,13,77,45,109,29,93,61,
125,3,67,35,99,19,83,51,115,11,75,43,107,27,91,59,123,7,71,39,103,23,87,55,
119,15,79,47,111,31,95,63,127};
uint8 LED[32]={0x80,0x00,0xC0,0x00,0xE0,0x00,0xF0,0x00,
0xF8,0x00,0xFC,0x00,0xFE,0x00,0xFF,0x00,
0xff,0x80,0xff,0xC0,0xff,0xE0,0xff,0xF0,
0xff,0xF8,0xff,0xFC,0xff,0xFE,0xff,0xFF,};
uint8 COUNT=15,COUNT1=0,ADC_Count=0,LINE=15,G=0,T;
uint8 i,j,k,b,p,anum,led=0;
int Temp_Real,Temp_Imag,temp; // 中間臨時變量
uint16 TEMP1,max=0;
int xdata Fft_Real[128];
int xdata Fft_Image[128]; // fft的虛部
uint8 xdata LED_TAB2[16]; //記錄漂浮物是否需要停頓一下
uint8 xdata LED_TAB[16]; //記錄紅色柱狀
uint8 xdata LED_TAB1[16]; //記錄漂浮點
/////////////shop60610364.taobao.com/////////
void FFT()//基2fft
{
for( i=1; i<=7; i++) /* for(1) */
{
b=1;
b <<=(i-1); //碟式運算，用于計算隔多少行計算例如第一極 1和2行計算
for( j=0; j<=b-1; j++) /* for (2) */
{
p=1;
p <<= (7-i);
p = p*j;
for( k=j; k<128; k=k+2*b) /* for (3) */
{
Temp_Real=Fft_Real[k];
Temp_Imag=Fft_Image[k];
temp=Fft_Real[k+b];
Fft_Real[k]=Fft_Real[k]+((Fft_Real[k+b]*COS_TAB[p])>>7)+((Fft_Image[k+b]*SIN_TAB[p])>>7);
Fft_Image[k]=Fft_Image[k]-((Fft_Real[k+b]*SIN_TAB[p])>>7)+((Fft_Image[k+b]*COS_TAB[p])>>7);
Fft_Real[k+b]=Temp_Real-((Fft_Real[k+b]*COS_TAB[p])>>7)-((Fft_Image[k+b]*SIN_TAB[p])>>7);
Fft_Image[k+b]=Temp_Imag+((temp*SIN_TAB[p])>>7)-((Fft_Image[k+b]*COS_TAB[p])>>7); // 移位.防止溢出. 結果已經是本值的 1/64
Fft_Real[k] >>= 1;
Fft_Image[k] >>= 1;
Fft_Real[k+b] >>= 1;
Fft_Image[k+b] >>= 1;
}
}
}
for(j=0;j<16;j++)//16分頻
{
TEMP1=((((Fft_Real[j+1]* Fft_Real[j+1]))+((Fft_Image[j+1]*Fft_Image[j+1])))>>1);//求各頻段幅值
if(TEMP1<1)TEMP1=0;
LED_TAB[j]=TEMP1;
if(LED_TAB[j]>max)max=LED_TAB[j];
}
if(max>16)//分級量化
{
max/=16;
for(j=0;j<16;j++)LED_TAB[j]/=max;
}
}
void delay2us(void) //2us延時
{
unsigned char a,b;
for(b=1;b>0;b--)
for(a=3;a>0;a--);
}
void Init()
{
//-----------------------------------------------------------------------------------
P1ASF = 0x02; //0000,0010, 將 P1.1 置成模擬口
AUXR1 &=0xFB; //1111,1011, 令 ADRJ=0
EADC=1; //AD中斷打開
ADC_CONTR = ADC_POWER | ADC_SPEEDHH | ADC_START | channel;//1110 1001 1打開 A/D （ADC_POWER）轉換電源；11速度為90周期一次；
//0中斷標志清零；1啟動adc(ADC_START);001AD通道打開（這里為P1.1）;
//-----------------------------------------------------------------------------------
P2M0=1;
TMOD=0X12;
TH0=0xb0;
TL0=0xb0;
TH1=0xfe;
TL1=0Xd4;
ET0=1; //定時器0 打開
TR0=0; //關閉定時器
ET1=1;
TR1=1;
PT1=0;
PT0=1;
IPH=PADCH;
IP=PADC; //中斷優先級
EA=1; //總中斷打開
}
//----------------------------------------------------------------------------------------
void ADC_Finish() interrupt 5
{ ADC_CONTR &= !ADC_FLAG;
Fft_Real[LIST_TAB[ADC_Count]]=(int)((ADC_RES)<<1)+(ADC_RESL>>1)*2;//按LIST_TAB表里的順序，進行存儲采樣值
if(ADC_Count<=127)ADC_Count++;
else {EADC=0;TR0=0;}
}
//---------------------------------------------------------------------------------------
void LED_Display() interrupt 3 //中斷一次顯示一列
{
TH1=0xfe;
TL1=0Xd4;
G++;
if(G==33)G=1;
switch(G) //往點陣屏填充一列的數據
{
case 1:sw=1;anum=LED_TAB[0];P_3=0x00;break;
case 2:anum=LED_TAB[0];P_3=0x01;break;
case 3:anum=LED_TAB[1];P_3=0x02;break;
case 4:anum=LED_TAB[1];P_3=0x03;break;
case 5:anum=LED_TAB[2];P_3=0x04;break;
case 6:anum=LED_TAB[2];P_3=0x05;break;
case 7:anum=LED_TAB[3];P_3=0x06;break;
case 8:anum=LED_TAB[3];P_3=0x07;break;
case 9:anum=LED_TAB[4];P_3=0x08;break;
case 10:anum=LED_TAB[4];P_3=0x09;break;
case 11:anum=LED_TAB[5];P_3=0x0a;break;
case 12:anum=LED_TAB[5];P_3=0x0b;break;
case 13:anum=LED_TAB[6];P_3=0x0c;break;
case 14:anum=LED_TAB[6];P_3=0x0d;break;
case 15:anum=LED_TAB[7];P_3=0x0e;break;
case 16:anum=LED_TAB[7];P_3=0x0f;break;
case 17:sw=0;anum=LED_TAB[8];P_3=0x00;break;
case 18:anum=LED_TAB[8];P_3=0x10;break;
case 19:anum=LED_TAB[9];P_3=0x20;break;
case 20:anum=LED_TAB[9];P_3=0x30;break;
case 21:anum=LED_TAB[10];P_3=0x40;break;
case 22:anum=LED_TAB[10];P_3=0x50;break;
case 23:anum=LED_TAB[11];P_3=0x60;break;
case 24:anum=LED_TAB[11];P_3=0x70;break;
case 25:anum=LED_TAB[12];P_3=0x80;break;
case 26:anum=LED_TAB[12];P_3=0x90;break;
case 27:anum=LED_TAB[13];P_3=0xa0;break;
case 28:anum=LED_TAB[13];P_3=0xb0;break;
case 29:anum=LED_TAB[14];P_3=0xc0;break;
case 30:anum=LED_TAB[14];P_3=0xd0;break;
case 31:anum=LED_TAB[15];P_3=0xe0;break;
case 32:anum=LED_TAB[15];P_3=0xf0;break;
}
for(led=0;led<=anum;led++) //遞增
{ P0=LED[2*led+1];
P2=LED[2*led];
delay2us();
} //遞減
for(;led>=0;led--)
{ P0=LED[2*led+1];
P2=LED[2*led];
delay2us();
}
}
//------------------------------------------------------------------------------------------------------------
void Ad_Control() interrupt 1 //控制采樣率
{
ADC_CONTR = ADC_POWER | ADC_SPEEDHH| ADC_START | channel; //開始AD采集
}
//===============================================================================================================
void main()
{
uint8 i;
Init();
while(1)
{
ADC_Count=0;
TR0=1;
EADC=1; //開啟定時器中斷0，開啟ADC
while(ADC_Count<128);
for(i=0;i<128;i++)
{
Fft_Image[i]=0;
}
FFT();//FFT運算并轉換為各頻段幅值
}
}

復制代碼

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