Project 1 - Controlling a DC motor using PWM and monitoring its Running status

offline batch chennai

#include <avr/io.h>
#define F_CPU 16000000L
#include "avr/interrupt.h"
#include <util/delay.h>
#define sw_dir (PIND & (1<<1))
#define sw_spd (PIND & (1<<2))
#define pw (PINC & (1<<3))
#define lcd_port PORTB
#define RS_high PORTD |= (1<<5)
#define RS_low PORTD &= ~(1<<5)
#define EN_high PORTD |= (1<<6)
#define EN_low PORTD &= ~(1<<6)
unsigned char i;

void lcd_cmd (char cmd)
{

lcd_port = (cmd &0xf0);
RS_low;
EN_low;
_delay_ms(1);
EN_high;
lcd_port = ((cmd<<4) & (0xf0));
RS_low;
EN_low;
_delay_ms(1);
EN_high;
}

void lcd_data(char data)
{

lcd_port = (data &0xf0);
RS_high;
EN_low;
_delay_ms(1);
EN_high;
lcd_port = ((data<<4) & (0xf0));
RS_high;
EN_low;
_delay_ms(1);
EN_high;
}

void lcd_init()
{

lcd_cmd(0x02);_delay_ms(5);
lcd_cmd(0x01);_delay_ms(5);
lcd_cmd(0x0C);_delay_ms(5);
lcd_cmd(0x06);_delay_ms(5);
lcd_cmd(0x80);_delay_ms(5);
lcd_cmd(0x28);_delay_ms(5);
}

void cursorpos(char x,char y)
{

if((x<1 || x>2) || (y>16 || y<1))
{

x=1;
y=1;
}
if(x==1)
{

lcd_cmd(0x7f+y);
}
else
{
lcd_cmd(0xBF+y);
}
}
void lcd_out(char x,char y,char *str)
{

cursorpos(x,y);
while(*str)
{
lcd_data(*str);
str++;

}

}

int main(void)
{
DDRB = 0xFF;
DDRA |= ((1<<0) | (1<<1));
DDRD &= ~(1<<1);
DDRD &= ~(1<<2);
DDRD |= (1<<5);
DDRD |= (1<<6);
DDRC &= ~(1<<3);
PORTD |= (1<<2);
PORTC |= (1<<3);
i=64;
TCCR0 = 0x61;
GICR = (1<<INT0);
MCUCR = 0x02;
sei();
lcd_init();
while(1)
{
while(pw==0)
{
if(sw_dir==0)
{
PORTA = 0b00000001;
lcd_out(1,1,"MOtor is Running");
lcd_out(2,3,"Clockwise");
}
else
{
PORTA = 0b00000010;
lcd_out(1,1,"MOtor is Running");
lcd_out(2,3,"Anticlockwise");
}
OCR0=i;
}
PORTA = 0x00;
lcd_out(1,1,"MOTOR is off");
lcd_out(2,3,"Anticlockwise");
}

}

ISR(INT0_vect)
{
i=i+20;
}