keybord__.c

使用AVR单片机对信号进行采集,通过FFT,分析信号失真度

/*********************************************
File name : demo_9_3.c
Chip type : ATmega16
Program type : Application
Clock frequency : 4.000000 MHz
Memory model : Small
External SRAM size : 0
Data Stack size : 256
*********************************************/

#include <mega16.h>
#include <delay.h>
#include <stdlib.h> 
     

// Standard Input/Output functions
#include <stdio.h>

#define byte unsigned char

int freq_time_counter;
bit freq_time_ok,begin_scan,set_num;
byte freq_point[8];
byte i,fft_cnt=0;

int freq_point_num=1000;
char flag;
char dis_num[5]="";
byte signal_type=0;


void set_dds(int f);
void display_result();
void handle();


#include "head_12864.h"
#include "head_keyboard.h"
#include "head_zimo.h"
#include "head_menu.h"
#include "picture.h"
#include "head_spi.h"
#include "head_FFT.h"



interrupt [TIM0_COMP] void timer0_comp_isr(void)
{
if (++key_stime_counter >=5)
{
key_stime_counter = 0;
key_stime_ok = 1; // 10ms 到
}
if (++freq_time_counter >=500)
{
  freq_time_counter=0;
  freq_time_ok=1;
}
}




char my_pow(char a,char b);
// External Interrupt 0 service routine
interrupt [EXT_INT0] void ext_int0_isr(void)
{
  flag=1;
}


void main(void)
{
  PORTC=0xFF;
  DDRC=0x00;
  PORTD=0xFF;     
  DDRD=0xF3; 
    
KB_PORT = 0xFF; // 键盘接口初始化
KB_DDR = 0xF0; // PD2、PD1、PD0列线，输入方式，上拉有效
SFIOR =0x00;

lcd_init(16);
lcd_clear(); // clere the LCD

/*for (i=0;i<=50;i++)
{
  lcd_gotoxy_pic(0,50-i);
  disp_picture(picture);
  //delay_ms(1);
}//从下往上滚动*/ 

//disp_picture_disappear(picture);
lcd_clear(); // clere the LCD

last_key=0;
menu_state[0]=0;
set_menu();
set_dds(freq_point_num);

// T/C0 初始化
TCCR0=0x0B; // 内部时钟，64 分频（4M/64=62.5KHz），CTC 模式
TCNT0=0x00;
OCR0=0x7C; // OCR0 = 0x7C(124),(124+1)/62.5=2ms
TIMSK=0x02; // 允许T/C0 比较匹配中断

/*
// External Interrupt(s) initialization
// INT0: On
// INT0 Mode: Rising Edge
// INT1: Off
// INT2: Off
  GICR|=0x40;
  MCUCR=0x03;
  MCUCSR=0x00;
  GIFR=0x40;    */

#asm("SEI") // 开放全局中断

while (1)
{ 
       if (key_stime_ok==1)
	{
	      key_stime_ok = 0; // 10ms 到
	      key_temp = read_keyboard(); // 调用键盘接口函数读键盘
          	
          	
          	    
	        if ((menu_state[0]==2) & (menu_state[1]==21))
	              set_freq_point();
	                       
     	        if ((!set_num)&(!begin_scan)&(key_temp >=1)&(key_temp <=9))
     		{
     		   if (menu_state[0]==2 & key_temp==2) set_signal_type();
     		   
     		   lcd_clear_pic();
     		   select_menu(0,(key_temp-1)*16,16,16);
     		   set_menu();                       
     		}   
     	        
     		if (menu_state[0]==1)
          	{
          	  if (fft_cnt==0)
          	  {
          	    //FFT();
       		    lcd_gotoxy(7,2);
		    handle();
		    lcd_putchar(dis_num[0]);
		    lcd_putchar(dis_num[1]);
		    lcd_putchar(dis_num[2]);
	  	    lcd_putchar(dis_num[3]);
	  	    display_result();
      		  }
      		  fft_cnt++;
	        }
     	            
	        if (key_temp!=No_key)
	        {
	          last_key=key_temp;
	          
	        }	  
	}//	end of [if (key_stime_ok==1)]
	
};

}


void set_dds(int f)
{
       spi_send_data(f,signal_type);


}

void display_result()
{
  int j;
  #asm("CLI");
  for (i=0;i<N;i++)
  {
    distortion[i]=i*2;
    for (j=0;j<=distortion[i];j++)
    {
    	lcd_putpoint(4*i+2,60-j/2);
   	lcd_putpoint(4*i+1,60-j/2);
   	lcd_putpoint(4*i,60-j/2);
    }
  }
  #asm("SEI");
}

void handle()
{
  char i;
  unsigned int temp;
  temp= (char)kf;
  for(i=0;i<4;i++)
  {
    dis_num[3-i]=temp%10+0x30;                                                                                                                                                                               
    temp/=10;
  }
}