[SOLVED] Problem with CAVR coding for stopwatch

[fauzan]

I need help for my stopwatch project, i have problem to show the time like "02:04.89", the problem is when i start the microcontroller, the program can't display "0" beside "2", it's just show number "2_" when number become tens, it will show... can u fix it? i hope anybody can help me... thanks

this is my program

Chip type               : ATmega8535
Program type            : Application
AVR Core Clock frequency: 4,000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 128


#include <mega8535.h>

// Alphanumeric LCD Module functions
#asm
   .equ __lcd_port=0x15 ;PORTC
#endasm
#include <lcd.h>
#include <stdio.h>
#include <stdlib.h>

unsigned int count=0,kali=0;
unsigned char detik=0, menit=0;
unsigned char cdetik[10],cmenit[10],ccount[10];

// Timer1 overflow interrupt service routine
interrupt [TIM1_OVF] void timer1_ovf_isr(void)
{
// Reinitialize Timer1 value
TCNT1H=0xFF64 >> 256;
TCNT1L=0xFF64 & 0xff;

if(++count==100)
    {
    count=0;
    lcd_clear();
        if(++detik==60)
            {
            detik=0;
            lcd_clear();
                if(++menit==20)
                {
                menit=0;
                lcd_clear();
                }
             }
     }                                
    kali=0;                           
    itoa(count,ccount);         
    itoa(detik,cdetik);           
    itoa(menit,cmenit);               
    lcd_gotoxy(11,0);
    lcd_puts(ccount);
    lcd_gotoxy(10,0);
    lcd_puts(".");
    lcd_gotoxy(8,0);
    lcd_puts(cdetik);
    lcd_gotoxy(7,0);
    lcd_puts(":");
    lcd_gotoxy(5,0);
    lcd_puts(cmenit);

// Place your code here

}

// Declare your global variables here

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

// Input/Output Ports initialization

PORTA=0x00;
DDRA=0x00;


PORTB=0x00;
DDRB=0x00;

PORTC=0x00;
DDRC=0x00;

PORTD=0x00;
DDRD=0x00;

TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;

TCCR1A=0x00;
TCCR1B=0x01;
TCNT1H=0xFF;
TCNT1L=0x64;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;

MCUCR=0x00;
MCUCSR=0x00;


TIMSK=0x04;


ACSR=0x80;
SFIOR=0x00;

// LCD module initialization
lcd_init(16);

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

while (1)
      {
};
};

 

[horace1]

you can use sprintf() from <stdio.h> to create a string with the time formatted as required then write it to the LCD
e.g. this displays the result to the screen but you can display data to the LCD

        unsigned int hours=2, minutes=4, seconds=59;
        char data[25];
	sprintf(data,"%02u:%02u:%02u",hours, minutes, seconds);
	printf("time %s\n", data);

the conversion specification %02u converts an unsigned int to field width 2 digits with 0 specifing print leading zeros
the above program displays

02:04:59

 

[fauzan]

Thanks horace1, your reply for my thread is very usefull.. now i can make my own stopwatch program.

here is my final code

Chip type               : ATmega8535
Program type            : Application
AVR Core Clock frequency: 4,000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 128
*****************************************************/

#include <mega8535.h>

// Alphanumeric LCD Module functions
#asm
   .equ __lcd_port=0x15 ;PORTC
#endasm
#include <lcd.h>
#include <stdio.h>
#include <stdlib.h>

unsigned char count=0, detik=0, menit=0;
char data[25];

interrupt [TIM1_OVF] void timer1_ovf_isr(void)
{
// Reinitialize Timer1 value
TCNT1H=0xFF64 >> 256;
TCNT1L=0xFF64 & 0xff;

if(++count==100)
    {
    count=0;
    lcd_clear();
        if(++detik==60)
            {
            detik=0;
            lcd_clear();
                if(++menit==20)
                {
                menit=0;
                lcd_clear();
                }
             }
     }

sprintf(data,"%02u:%02u.%02u",menit,detik,count);
lcd_gotoxy(0,0);
lcd_puts(data);

}

void main(void)
{

PORTA=0x00;
DDRA=0x00;

PORTB=0x00;
DDRB=0x00;

PORTC=0x00;
DDRC=0x00;


PORTD=0x00;
DDRD=0x00;

TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;

TCCR1A=0x00;
TCCR1B=0x01;
TCNT1H=0xFF;
TCNT1L=0x64;

ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;

MCUCR=0x00;
MCUCSR=0x00;

TIMSK=0x04;

ACSR=0x80;
SFIOR=0x00;

// LCD module initialization
lcd_init(16);

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

while (1)
      {
}
};

here is the display