خطا در ADC

[ben-robot]

سلام دوستان

من برنامه ای نوشتم و همزمان تایمر و ADCرا استفاده کردم حالا خطای

Error: C:\Documents and Settings\ben\Desktop\ADC\adc.c(40): undefined symbol 'read_adc' می ده

یعنی چی ؟

/*****************************************************
This program was produced by the
CodeWizardAVR V2.05.0 Professional
Automatic Program Generator
© Copyright 1998-2010 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project : 
Version : 
Date  : 7/30/2014
Author : 
Company : 
Comments: 


Chip type        : ATmega8
Program type      : Application
AVR Core Clock frequency: 16.000000 MHz
Memory model      : Small
External RAM size    : 0
Data Stack size     : 256
*****************************************************/

#include <mega8.h>

#include <delay.h>

// Standard Input/Output functions
#include <stdio.h>
#include <ctype.h>
// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{


 
 int a; 
 int b;
 int c,set; 
  a=read_adc(0);
 
// Reinitialize Timer 0 value
TCNT0=0x35;
// Place your code here


    
  
   
   
   if(a>=240&&c==0&&PINB.1==1){
   b=b+1; 
   c=1; 
         set=toascii(12);
    putchar(set);
      
  
       printf("Deept:%iCM", b); 
 
   } 
   
   if(a>=240&&c==0&&PINB.0==0){ 
      
 
      set=toascii(12);
    putchar(set);
       b=b-1; 
       c=1;
      if(a<=0){
       a=0;
      
      }
       printf("Deept:%iCM", b);
       
       
    
  
 
 }
   
   
   
   if(a<=20){
        c=0;
   } 
   
   if(PINB.2==0){
       b=0;  
         set=toascii(12);
    putchar(set);
       
        printf("Deept:%iCM", b);  
        
        
    }
   
 }  










#define ADC_VREF_TYPE 0x20

// Read the 8 most significant bits
// of the AD conversion result
unsigned char read_adc(unsigned char adc_input)
{
ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSRA|=0x40;
// Wait for the AD conversion to complete
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
return ADCH;
}

// Declare your global variables here

void main(void)
{
// Declare your local variables here

// Input/Output Ports initialization
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
PORTB=0x00;
DDRB=0x00;

// Port C initialization
// Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
// State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
PORTC=0x00;
DDRC=0x00;

// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
PORTD=0x00;
DDRD=0x00;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 16000.000 kHz
TCCR0=0x01;
TCNT0=0x35;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer1 Stopped
// Mode: Normal top=0xFFFF
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer2 Stopped
// Mode: Normal top=0xFF
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;

// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
MCUCR=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x01;

// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: Off
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x08;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x67;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;

// ADC initialization
// ADC Clock frequency: 1000.000 kHz
// ADC Voltage Reference: AREF pin
// Only the 8 most significant bits of
// the AD conversion result are used
ADMUX=ADC_VREF_TYPE & 0xff;
ADCSRA=0x84;

// SPI initialization
// SPI disabled
SPCR=0x00;

// TWI initialization
// TWI disabled
TWCR=0x00;

// Global enable interrupts
#asm("sei")

while (1)
   {
   // Place your code here  
  

   }
}

[AliRezaDAVE]

پاسخ : خطا در ADC

این رو قبل از اینکه کد مربوط به وقفه رو بنویسی اضافه کن:

unsigned char read_adc(unsigned char adc_input)

توابع باید قبل از هرچیزی تعریف بشوند.