单片机音频显示电路的制作

　　这次的小作品是频谱显示，8*16的led显示点阵配合stc12系列单片机系统，就可以自己制作廉价的频谱显示了！关于原理图我想说的是，这是原理图，不是封装图，所以大多数IC是看不到Vcc或者Gnd的，但不代表没有，希望初学者留意。原理图是用proteus画的，信号输入端的电阻、电容是抗干扰用的，大小请根据电路的实际情况做改动
　　这次的程序不是本人编写，是我师弟的设计，程序是有缺陷的，比如音效的延时，显示的效果等，有耐心的朋友可以自己修改程序，这次的作品在于分享数模转换程序和FFT算法，我也希望网友可以将完善的程序分享到网上，大家共同进步！！！？ 单片机音频显示电路原理图

单片机音频显示实物照片

下面是我的焊接工程，不熟悉电路布局的童鞋可以做为参考

单片机音频显示点阵正面

单片机音频显示点阵背面

单片机音频显示系统板正面

单片机音频显示系统板背面

单片机音频显示成品

　　在这里要说的是，焊接并不算复杂，无非就是点阵的焊接耗时耗力，要是有点焊接功夫，小半天也足够了，焊接的时候千万不要弄断管脚，弯折的管脚做跳线最好不过（图3）。系统板的布局我建议大家紧凑一些，我自己焊接的时候是考虑到这板子以后可能加个时间显示什么的，所以预留了一些空间，这样以后再做点阵显示的时候就方便多了。

程序：

#includestc12c5a.h#includeintrins.h#includebasic.htypedef unsigned char uint8;typedef unsigned int uint16;#define ADC_FLAG (14) /*ADC_中断标志*//*放大128倍后的sin整数表（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整数表（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 };/*采样存储序列表*/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};/*分级量化表*/uint8 QTY_TAB[] = {0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff};uint8 ADC_Count=0;uint8 i,j,k,b,p,anum; uint16 xdata Fft_Real[128];uint16 xdata Fft_Image[128]; // fft的虚部uint8 xdata LED_TAB[16]; //记录红色柱状/********************************************************************* 名称 : FFT* 功能 : 碟型运算转换* 输入 : 无* 输出 : 读出的值***********************************************************************/void FFT()//基2fft{ uint16 Temp_Real,Temp_Imag,temp; // 中间临时变量uint16 TEMP1 = 0,max=0;for( i=1; i=7; i++) /* for(1) */{b=1;b =(i-1); //碟式运算，用于计算隔多少行计算例如 第一极 1和2行计算for( j=0; j=b-1; j++) /* for (2) */{p=1;p = (7-i); p = p*j;for( k=j; k128; 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. 结果已经是本值的 1/64 Fft_Real[k] = 1; Fft_Image[k] = 1;Fft_Real[k+b] = 1; Fft_Image[k+b] = 1; } }}for(j=0;j16;j++)//16分频 { TEMP1=((((Fft_Real[j+1]* Fft_Real[j+1]))+((Fft_Image[j+1]*Fft_Image[j+1])))1);//求各频段幅值if(TEMP11)TEMP1=0;LED_TAB[j]=TEMP1; if(LED_TAB[j]max)max=LED_TAB[j];}if(max 16)//分级量化{max/=16;for(j=0;j16;j++)LED_TAB[j]/=max;} }/********************************************************************* 名称 : GPIO_init* 功能 : GPIO初始化* 输入 : 无* 输出 : 读出的值***********************************************************************/void GPIO_init(){P0M0 = 1; P0M1 = 0; P0 = 0XFF; /*列*/P2M0 = 1; P2M1 = 0; P2 = 0XFF;P3M0 = 1; P3M1 = 0; P3 = 0XFF; /*行*/}/********************************************************************* 名称 : timer_Init* 功能 : 内部寄存器初始化* 输入 : 无* 输出 : 无***********************************************************************/void timer_Init(){TMOD = 0X12;TH0 = 0xb0; TL0 = 0xb0;ET0 = 1; //定时器0 打开TR0 = 0; //关闭定时器TH1 = 0xfd; TL1 = 0Xa8;ET1 = 1;TR1 = 1; EA = 1; }/********************************************************************* 名称 : adc_Init* 功能 : 内部寄存器初始化* 输入 : 无* 输出 : 无***********************************************************************/void adc_Init(){ ADC_CONTR = 0x80; //ADC电源打开_nop_();_nop_();_nop_();_nop_();P1ASF = 0x01; //0000,0001, 将 P1.0 置成模拟口AUXR1 =0xFB; //1111,1011, 令 ADRJ=0ADC_RES = 0x00; //清零寄存器ADC_RESL = 0x00;EADC = 1; //AD中断打开EA = 1; //总中断打开}/********************************************************************* 名称 : main* 功能 : 主程序* 输入 : 无* 输出 : 无***********************************************************************/void main(){uint8 i = 0;GPIO_init();timer_Init();adc_Init();while(1){ADC_Count = 0;EADC = 1;TR0 = 1;while(ADC_Count 128); //满足128点for(i=0; i128; i++) //清除虚部{Fft_Image[i] = 0;}FFT(); //FFT运算并转换为各频段幅值}}/********************************************************************* 名称 : ADC_Finish* 功能 : ADC转换完成中断服务* 输入 : 无* 输出 : 无***********************************************************************/void ADC_Finish() interrupt 5{Fft_Real[LIST_TAB[ADC_Count]] = (int)(((ADC_RES)1)+(ADC_RESL1)*2)3; /*按LIST_TAB表顺序，进行存储采样值*/if(ADC_Count = 127){ADC_Count++; /*自动增量控制*/ADC_CONTR = !ADC_FLAG;}else{EADC = 0;TR0 = 0; } }/********************************************************************* 名称 : interrupt_timer1* 功能 : 显示屏幕刷新中断服务* 输入 : 无* 输出 : 无***********************************************************************/void interrupt_timer1() interrupt 3{ static uint8 rec = 0;TH1 = 0xfd; TL1 = 0Xa8;switch(rec) //往点阵屏填充一列的数据{case 0: P0 = QTY_TAB[LED_TAB[0]]; P2 = 0;break;case 1: P0 = QTY_TAB[LED_TAB[1]]; P2 = 1;break; case 2: P0 = QTY_TAB[LED_TAB[2]]; P2 = 2;break; case 3: P0 = QTY_TAB[LED_TAB[3]]; P2 = 3;break; case 4: P0 = QTY_TAB[LED_TAB[4]]; P2 = 4;break; case 5: P0 = QTY_TAB[LED_TAB[5]]; P2 = 5;break; case 6: P0 = QTY_TAB[LED_TAB[6]]; P2 = 6;break; case 7: P0 = QTY_TAB[LED_TAB[7]]; P2 = 7;break;case 8: P0 = QTY_TAB[LED_TAB[8]]; P2 = 8;break;case 9: P0 = QTY_TAB[LED_TAB[9]]; P2 = 9;break; case 10: P0 = QTY_TAB[LED_TAB[10]]; P2 = 10;break; case 11: P0 = QTY_TAB[LED_TAB[11]]; P2 = 11;break; case 12: P0 = QTY_TAB[LED_TAB[12]]; P2 = 12;break; case 13: P0 = QTY_TAB[LED_TAB[13]]; P2 = 13;break; case 14: P0 = QTY_TAB[LED_TAB[14]]; P2 = 14;break; case 15: P0 = QTY_TAB[LED_TAB[15]]; P2 = 15;break; default:break;}rec++;if(rec 15){rec = 0;}}/********************************************************************* 名称 : Ad_Control* 功能 : 控制采样率* 输入 : 无* 输出 : 无***********************************************************************/void Ad_Control() interrupt 1{ADC_CONTR = 0xe8; //开始AD采集_nop_();_nop_();_nop_();_nop_(); }
HEX文件：
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