DEV Community: SUNG CHUL

Pattern Shift

SUNG CHUL — Mon, 13 Feb 2023 06:08:35 +0000

#include <avr/io.h>
#define F_CPU 16000000L
#include <util/delay.h>
#include <avr/interrupt.h>

volatile int button_state = 0;

ISR(INT0_vect)
{
    button_state = (button_state + 1) % 2;
}

char up_pattern(char pattern)
{
    return((pattern << 1) | (pattern >> 7));
}

char down_pattern(char pattern)
{
    return((pattern >> 1) | (pattern << 7));
}

void INIT_INT0(void)
{
    EIMSK |= 1 << INT0;
    EICRA |= 1 << ISC01;
    sei();
}

int main(void)
{
    DDRB = 0xFF;
    DDRD = 0x00;                   

    INIT_INT0();

    char pattern = 0x01;
    PORTB = pattern;

    while (1) 
    {
        if(button_state == 1) 
            pattern = up_pattern(pattern);

        else 
            pattern = down_pattern(pattern);


        PORTB = pattern;
        _delay_ms(150);
    }
    return 0;
}

Pull up Pull down

SUNG CHUL — Sat, 11 Feb 2023 02:48:27 +0000

When swith turned off, Input gain 1 on pull up system.

When swith turned on, Input gain 0 on pull up system.

How to make Pull UP system

When swith turned off, Input gain 0 on pull down system.

When swith turned on, Input gain 1 on pull down system.

How to make Pull DOWN system

Blink an LED v.2

SUNG CHUL — Mon, 09 Jan 2023 07:00:31 +0000

#define F_CPU 16000000L
#include <avr/io.h>
#include <util/delay.h>


int main(void)
{
    DDRB |= 0x0F;   // xxxx1111

    PORTB = 0x01;
    while (1)
    {   
        while (PORTB != 0x08) {
            _delay_ms(500);
            PORTB = PORTB << 1;
        }

        while (PORTB != 0x01) {
            _delay_ms(500);
            PORTB = PORTB >> 1;
        }       
    }
}

Easy

Blink an LED

SUNG CHUL — Mon, 09 Jan 2023 06:43:45 +0000

My code

#define F_CPU 16000000L
#include <avr/io.h>
#include <util/delay.h>

int main(void)
{
    DDRB |= 0x0F;   // xxxx1111

    PORTB = 0x01;
    while (1)
    {   
        _delay_ms(500);

        PORTB = PORTB << 1;
        if(PORTB == 0x10)
            PORTB = 0x01;
    }
}

chatGPT's code

#include <avr/io.h>
#include <util/delay.h>

#define LED_PIN PB0

DDRB |= (1 << LED_PIN);
int main(void){
    while (1) {
        PORTB |= (1 << LED_PIN);  // turn the LED on
        _delay_ms(500);  // delay for 500 milliseconds
        PORTB &= ~(1 << LED_PIN);  // turn the LED off
        _delay_ms(500);  // delay for 500 milliseconds
    }
    return 0;
}

Easy

Advice from ChatGPT

SUNG CHUL — Fri, 06 Jan 2023 05:49:31 +0000

I studied about ATmega128 last semester. I want to know more about it so I borrowed the kit from professor `(>﹏<)′ but don't know what can I do. So I asked to ChatGPT and this is its(?) his(?) answer.

I'm a student from ROK.

SUNG CHUL — Fri, 06 Jan 2023 05:44:01 +0000

I'm student and I don't know what to do now so I'm writing this. This will end when my vacation is over.