problem in getting duty cycle displayed on cro

[likitha.b]

hi,
can some one tell me what is the mistake in this code i am not getting output on cro.

interrupt service routine code for INT0
int p_rpm;//global variable.
{
int c_rpm;//current rpm
c_rpm=TCNT0;//loading the value of timer0 to current rpm
if(TOV0)
{
rpm=(TOV0*65535)+(c_rpm - p_rpm)/freq;//calculating the rpm when the time overflows.
}
rpm=(c_rpm - p_rpm)*1/freq;//freq is nothing but system clock freq defined i.e., 977hz
p_rpm = c_rpm;//equating previous rpm to current rpm
i=rpm/10;
}






main loop //for duty cycle to be displayed on the cro
while(1)
{
delay_ms(i);
turn on portb bit no 4;
delay(10-i);
turn off portb bit no 4;
}

i hv used INT0 of atmega8 at falling edge
and giving input to PD2 of portb and hv made it as pull up
for output i am using PB4 of portb made it as out and 1.
software used is code vision AVR. main objective of this code is to display the input frequency in terms of duty cycle on cro.

 

[zia]

where are u clearing port as o/p and where is configuration settings as well are u clearing flag in interrupt function

 

[likitha.b]

all configurations are made in the software itself

 

[jayanth.devarayanadurga]

Post the full code.

 

[likitha.b]

/*******************************************************
This program was created by the
CodeWizardAVR V2.60 Evaluation
Automatic Program Generator
© Copyright 1998-2012 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project :
Version :
Date : 3/20/2013
Author :
Company :
Comments:


Chip type : ATmega8L
Program type : Application
AVR Core Clock frequency: 1.000000 MHz
Memory model : Small
External RAM size : 0
Data Stack size : 256
*******************************************************/

#include <mega8.h>
#include <delay.h>
// Declare your global variables here
int i,freq,rpm,prpm;
// Timer1 input capture interrupt service routine
interrupt [TIM1_CAPT] void timer1_capt_isr(void)
{
int crpm=TCNT1;
freq = ICR1;
if(TOV0)
{
rpm = ((TOV0*65535)/freq)+((crpm-prpm)/freq);
}
rpm = ((crpm-prpm)/freq);
prpm=crpm;
}

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

// Input/Output Ports initialization
// Port B initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=Out Bit3=In Bit2=In Bit1=In Bit0=In
DDRB=(0<<DDB7) | (0<<DDB6) | (0<<DDB5) | (1<<DDB4) | (0<<DDB3) | (0<<DDB2) | (0<<DDB1) | (0<<DDB0);
// State: Bit7=T Bit6=T Bit5=T Bit4=1 Bit3=T Bit2=T Bit1=T Bit0=P
PORTB=(0<<PORTB7) | (0<<PORTB6) | (0<<PORTB5) | (1<<PORTB4) | (0<<PORTB3) | (0<<PORTB2) | (0<<PORTB1) | (1<<PORTB0);

// Port C initialization
// Function: Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In
DDRC=(0<<DDC6) | (0<<DDC5) | (0<<DDC4) | (0<<DDC3) | (0<<DDC2) | (0<<DDC1) | (0<<DDC0);
// State: Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T
PORTC=(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=P Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T
PORTD=(0<<PORTD7) | (0<<PORTD6) | (1<<PORTD5) | (0<<PORTD4) | (0<<PORTD3) | (0<<PORTD2) | (0<<PORTD1) | (0<<PORTD0);

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
TCCR0=(0<<CS02) | (0<<CS01) | (0<<CS00);
TCNT0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 0.977 kHz
// Mode: Normal top=0xFFFF
// OC1A output: Disconnected
// OC1B output: Disconnected
// Noise Canceler: Off
// Input Capture on Rising Edge
// Timer Period: 67.109 s
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: On
// 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) | (1<<ICES1) | (0<<WGM13) | (0<<WGM12) | (1<<CS12) | (0<<CS11) | (1<<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) | (1<<TICIE1) | (0<<OCIE1A) | (0<<OCIE1B) | (0<<TOIE1) | (0<<TOIE0);

// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
MCUCR=(0<<ISC11) | (0<<ISC10) | (0<<ISC01) | (0<<ISC00);

// 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
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<<ADFR) | (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);

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

while (1)
{
i=rpm/10;
delay_ms(i);
PORTB=0x06;
delay_ms(10-i);
PORTB=0x00;


}
}