Project 1 - Controlling a DC motor using PWM and monitoring its Running status
Answer:
code:
#include <avr/io.h>
#define F_CPU 16000000L
#include <avr/interrupt.h>
#include <util/delay.h>
#define sw_dir (PIND&(1<<1))
#define sw_dspd (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(0x28);
_delay_ms(5);
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);
}
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 adc_read(char channel) {
unsigned int a, result;
ADMUX=channel;
ADCSRA=0X80;
ADCH=0x00;
ADCL=0x00;
ADCSRA|=(1<<6);
while((ADCSRA&0x40)!=0);
a=ADCL;
result=ADCH;
result=result<<8;
result=result|a;
return result;
}
int main(void)
{
DDRB=0xFF;
DDRB |=((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 ON-CLW");
}
else
{
PORTA=0b00000010;
lcd_out(1,1,"Motor ON-ACL");
}
OCR0=i;
}
PORTA=0X00;
lcd_out(1,1,"Motor is_OFF");
}
}
ISR(INT0_vect)
{
i=i+20;
}