Why this Program not work properly?(ATMEGA32A,SRF05)

[panda1234]

Hi,
I bought a SRF05 and i write code below for measure distance but in LCD distance not show!
can you help me?
thanks (Sorry for my bad EN)

/*******************************************************
This program was created by the
CodeWizardAVR V3.12 Advanced
Automatic Program Generator
© Copyright 1998-2014 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project : 
Version : 
Date    : 6/30/2015
Author  : 
Company : 
Comments: 


Chip type               : ATmega32
Program type            : Application
AVR Core Clock frequency: 8.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 512
*******************************************************/

#include <mega32.h>
#include <delay.h>
// Alphanumeric LCD functions
#include <alcd.h>
#include <stdio.h>
int start=1;   //show Program Start
int counter=0;
float time=0.0;
float distance=0.0;
char lcd_buffer[20];
// Declare your global variables here

// External Interrupt 0 service routine
interrupt [EXT_INT0] void ext_int0_isr(void)
{
// Place your code here
counter=0;

}

// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
// Place your code here
 counter++;
}

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

// Input/Output Ports initialization
// Port A initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
DDRA=(0<<DDA7) | (0<<DDA6) | (0<<DDA5) | (0<<DDA4) | (0<<DDA3) | (0<<DDA2) | (0<<DDA1) | (0<<DDA0);
// State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
PORTA=(0<<PORTA7) | (0<<PORTA6) | (0<<PORTA5) | (0<<PORTA4) | (0<<PORTA3) | (0<<PORTA2) | (0<<PORTA1) | (0<<PORTA0);

// Port B initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
DDRB=(0<<DDB7) | (0<<DDB6) | (0<<DDB5) | (0<<DDB4) | (0<<DDB3) | (0<<DDB2) | (0<<DDB1) | (0<<DDB0);
// State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
PORTB=(0<<PORTB7) | (0<<PORTB6) | (0<<PORTB5) | (0<<PORTB4) | (0<<PORTB3) | (0<<PORTB2) | (0<<PORTB1) | (0<<PORTB0);

// Port C initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=Out 
DDRC=(0<<DDC7) | (0<<DDC6) | (0<<DDC5) | (0<<DDC4) | (0<<DDC3) | (0<<DDC2) | (0<<DDC1) | (1<<DDC0);
// State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
PORTC=(0<<PORTC7) | (0<<PORTC6) | (0<<PORTC5) | (0<<PORTC4) | (0<<PORTC3) | (0<<PORTC2) | (0<<PORTC1) | (0<<PORTC0);

// Port D initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
DDRD=(0<<DDD7) | (0<<DDD6) | (0<<DDD5) | (0<<DDD4) | (0<<DDD3) | (0<<DDD2) | (0<<DDD1) | (0<<DDD0);
// State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
PORTD=(0<<PORTD7) | (0<<PORTD6) | (0<<PORTD5) | (0<<PORTD4) | (0<<PORTD3) | (0<<PORTD2) | (0<<PORTD1) | (0<<PORTD0);

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 8000.000 kHz
// Mode: Normal top=0xFF
// OC0 output: Disconnected
// Timer Period: 0.032 ms
TCCR0=(0<<WGM00) | (0<<COM01) | (0<<COM00) | (0<<WGM01) | (0<<CS02) | (0<<CS01) | (1<<CS00);
TCNT0=0x00;
OCR0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer1 Stopped
// Mode: Normal top=0xFFFF
// OC1A output: Disconnected
// OC1B output: Disconnected
// 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=(0<<COM1A1) | (0<<COM1A0) | (0<<COM1B1) | (0<<COM1B0) | (0<<WGM11) | (0<<WGM10);
TCCR1B=(0<<ICNC1) | (0<<ICES1) | (0<<WGM13) | (0<<WGM12) | (0<<CS12) | (0<<CS11) | (0<<CS10);
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=0<<AS2;
TCCR2=(0<<PWM2) | (0<<COM21) | (0<<COM20) | (0<<CTC2) | (0<<CS22) | (0<<CS21) | (0<<CS20);
TCNT2=0x00;
OCR2=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=(0<<OCIE2) | (0<<TOIE2) | (0<<TICIE1) | (0<<OCIE1A) | (0<<OCIE1B) | (0<<TOIE1) | (0<<OCIE0) | (1<<TOIE0);

// External Interrupt(s) initialization
// INT0: On
// INT0 Mode: Any change
// INT1: Off
// INT2: Off
GICR|=(0<<INT1) | (1<<INT0) | (0<<INT2);
MCUCR=(0<<ISC11) | (0<<ISC10) | (0<<ISC01) | (1<<ISC00);
MCUCSR=(0<<ISC2);
GIFR=(0<<INTF1) | (1<<INTF0) | (0<<INTF2);

// USART initialization
// USART disabled
UCSRB=(0<<RXCIE) | (0<<TXCIE) | (0<<UDRIE) | (0<<RXEN) | (0<<TXEN) | (0<<UCSZ2) | (0<<RXB8) | (0<<TXB8);

// Analog Comparator initialization
// Analog Comparator: Off
// The Analog Comparator's positive input is
// connected to the AIN0 pin
// The Analog Comparator's negative input is
// connected to the AIN1 pin
ACSR=(1<<ACD) | (0<<ACBG) | (0<<ACO) | (0<<ACI) | (0<<ACIE) | (0<<ACIC) | (0<<ACIS1) | (0<<ACIS0);
SFIOR=(0<<ACME);

// ADC initialization
// ADC disabled
ADCSRA=(0<<ADEN) | (0<<ADSC) | (0<<ADATE) | (0<<ADIF) | (0<<ADIE) | (0<<ADPS2) | (0<<ADPS1) | (0<<ADPS0);

// SPI initialization
// SPI disabled
SPCR=(0<<SPIE) | (0<<SPE) | (0<<DORD) | (0<<MSTR) | (0<<CPOL) | (0<<CPHA) | (0<<SPR1) | (0<<SPR0);

// TWI initialization
// TWI disabled
TWCR=(0<<TWEA) | (0<<TWSTA) | (0<<TWSTO) | (0<<TWEN) | (0<<TWIE);

// Alphanumeric LCD initialization
// Connections are specified in the
// Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu:
// RS - PORTB Bit 0
// RD - PORTB Bit 1
// EN - PORTB Bit 2
// D4 - PORTB Bit 4
// D5 - PORTB Bit 5
// D6 - PORTB Bit 6
// D7 - PORTB Bit 7
// Characters/line: 16
lcd_init(16);

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

while (1)
      {
      // Place your code here
      if(start==1)
      {
      start=0; 
      lcd_gotoxy(0,0);
       lcd_puts("Welcome");
       delay_ms(1000);         
      }
     PORTC.0=1;  //Trig. Pin
     delay_us(20);
     PORTC.0=0; 
      if(PORTD.2==0)   //Echo Pin
      {
       time=counter*0.032;   //time in ms(Freq:8 Mhz)
       distance=(time*343.0)/(20);   //Distance(cm)
       sprintf(lcd_buffer,"Distance: %f cm",distance);  
       lcd_clear();
       lcd_gotoxy(0,0);
       lcd_puts(lcd_buffer);
       delay_ms(200);
      }   
      
      }
}

 

[Surender Reddy]

Hi,

First of all do you know how to interface SRF05 module with the microcontroller.
For that you need send a signal (high to low) through trigger from uc then start the timer.
wait until the signal receives via echo then stop the timer.

so the timer value gives you the distance between the module and the obstacle.

For this no need to go for ISR functions, you can write simple logic using while loop.

 

[panda1234]

Thanks but I wrote new program without interrupt but still not work.

/*****************************************************
Project : 
Version : 1.0
Date    : 9/12/2013
Author  : 
Company : 
Comments: 


Chip type               : ATmega32
Program type            : Application
AVR Core Clock frequency: 8.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 512
*****************************************************/

#include <mega32.h>

// Alphanumeric LCD functions
#include <alcd.h>
#include <delay.h>
#include <stdio.h>
#include <stdlib.h>
volatile int T_Counter;
float T = 0.0;
float d = 0.0;
char str[33];

// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
// Place your code here
TCNT0 = 0;
T_Counter++;

}



// Declare your global variables here

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

// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=Out 
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=0 
PORTC=0x00;
DDRC=0x01;


// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 8000.000 kHz
// Mode: Normal top=0xFF
// OC0 output: Disconnected
TCCR0=0x01;
TCNT0=0x00;
OCR0=0x00;


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


// Alphanumeric LCD initialization
// Connections are specified in the
// Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu:
// RS - PORTA Bit 0
// RD - PORTA Bit 1
// EN - PORTA Bit 2
// D4 - PORTA Bit 4
// D5 - PORTA Bit 5
// D6 - PORTA Bit 6
// D7 - PORTA Bit 7
// Characters/line: 16
lcd_init(16);

// Global enable interrupts
#asm("sei")
DDRB=0xFF;
lcd_clear();
lcd_gotoxy(5,0);
lcd_puts("Welcome");
lcd_clear();


while (1)
      {
      // Place your code here
      
      delay_ms(150);
      T_Counter = 0;
      PORTC.0 = 1;
      delay_us(20);
      PORTC.0 = 0;
      
      while(PIND.2 == 0);
      
      TCNT0 = 0;
      TCCR0=0x01;

      while(PIND.2 == 1) {   
      };
      TCCR0=0x00;

      T = 0;
      d  = 0;
      
      T = (float)T_Counter*(256.0/8000.0) + (float)TCNT0/8000.0;   // Time in ms
      d = (float)T*340.0/20.0;
      
      ftoa(T,30,str);
      lcd_gotoxy(0,0);
      lcd_puts(str);
      
      
      ftoa(d,30,str);
      lcd_gotoxy(0,1);
      lcd_puts(str);
      }
}

Trig: PORTC.0
EchoORTD.2