imranahmed
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Please let me know about button debounce program for ATmega8,
I wrote a program but 1 sec delay is not achieved.Can anyone tell me any mistake in the given below code please?
I wrote a program but 1 sec delay is not achieved.Can anyone tell me any mistake in the given below code please?
Code C - [expand] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 #include<avr/io.h> #include<util/delay.h> #include <avr/interrupt.h> #define Red 240 #define Yellow 232 unsigned char button_timer; unsigned char button_pressed; //timer 1 overflow ISR ISR (TIMER1_COMPA_vect){ if (button_timer != 0){ button_timer--; } } void LED(void) { if(button_pressed==Red) { PORTB=0xFF; _delay_ms(500); PORTB=0x00; _delay_ms(500); } else if(button_pressed==Yellow) { PORTB=0xFF; _delay_ms(250); PORTB=0x00; _delay_ms(250); } } int main(void) { DDRD=0x07; DDRB=0xff; PORTB=0x00; button_pressed = 0; button_timer = 0; // set up timer 0 OCR1A = 7800; TCCR1B |= (1 << WGM12); // Mode 4, CTC on OCR1A. TIMSK |= (1 << OCIE1A); //Set interrupt on compare match. TCCR1B |= (1 << CS12) | (1 << CS10); // set prescaler to 1024 and start the timer. sei(); while(1) { if((button_timer == 0) && (PIND != 248)) { button_pressed = PIND; button_timer = 0; } else button_pressed = 248; LED(); } return 0; }
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