bài tập lập trình c

Nút nhấn bt2 led PORTX.1 sáng.. Nút nhấn bt3 led PORTX.2 sáng.. Nút nhấn bt4 led PORTX.3 sáng... Dùng 2 nút nhấn ĐK ngắt ngoài.

Bài 1a : Chớp tắt LED dùng for nhấp nháy 3 lần.

#include <mega8.h>

#include <delay.h>

#define data PORTB

unsigned int i,;

#define ADC_VREF_TYPE 0x00

unsigned int read_adc(unsigned char adc_input)

{

ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);

delay_us(10);

ADCSRA|=0x40;

while ((ADCSRA & 0x10)==0);

ADCSRA|=0x10;

return ADCW;

}

void tatled()

{

data=0x00;

}

void main(void)

{

PORTB=0x00;

DDRB=0xff;

PORTC=0x00;

DDRC=0x00;

PORTD=0x00;

DDRD=0x00;

TCCR0=0x00;

TCNT0=0x00;

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

MCUCR=0x00;

TIMSK=0x00;

UCSRB=0x00;

ACSR=0x80;

SFIOR=0x00;

ADMUX=ADC_VREF_TYPE & 0xff; ADCSRA=0x83;

SPCR=0x00;

TWCR=0x00;

while (1)

{

// Place your code here

tatled();

for(i=0;i<6;i++)

{

data=~data;

delay_ms(50);

}

}

Bài 1b : đếm nhị phân từ 0 -> 255.

#include <mega8.h>

#include <delay.h>

#define data PORTB

unsigned int i,;

#define ADC_VREF_TYPE 0x00

unsigned int read_adc(unsigned char adc_input) {

ADMUX=adc_input | (ADC_VREF_TYPE & 0xff); delay_us(10);

ADCSRA|=0x40;

while ((ADCSRA & 0x10)==0);

ADCSRA|=0x10;

return ADCW;

}

void tatled()

{

data=0x00;

}

void main(void)

{

PORTB=0x00;

DDRB=0xff;

PORTC=0x00;

DDRC=0x00;

PORTD=0x00;

DDRD=0x00;

TCCR0=0x00;

TCNT0=0x00;

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

MCUCR=0x00;

TIMSK=0x00;

UCSRB=0x00;

ACSR=0x80;

SFIOR=0x00;

ADMUX=ADC_VREF_TYPE & 0xff; ADCSRA=0x83;

SPCR=0x00;

TWCR=0x00;

while (1)

{

tatled();

for(i=0;i<256;i++)

{

data=i;

delay_ms(50);

}

}

Bài 1c : Dùng 2 nút nhấn:

Nút nhấn bt1 chạy led từ PORTX.0 -> PORTX.7 lưu lại Nút nhấn bt2 tắt led từ PORTX.7 -> PORTX.0

#include <mega8.h>

#include <delay.h>

#define data PORTB

#define bt1 PIND.0

#define bt2 PIND.1

unsigned int i, k;

#define ADC_VREF_TYPE 0x00

unsigned int read_adc(unsigned char adc_input)

{

ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);

delay_us(10);

ADCSRA|=0x40;

while ((ADCSRA & 0x10)==0);

ADCSRA|=0x10;

return ADCW;

}

void tatled()

{

data=0x00;

}

void main(void)

{

PORTB=0x00;

DDRB=0xff;

PORTC=0x0f;

DDRC=0x0f;

PORTD=0x0f;

DDRD=0x0f;

TCCR0=0x00;

TCNT0=0x00;

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

MCUCR=0x00;

TIMSK=0x00;

UCSRB=0x00;

ACSR=0x80;

SFIOR=0x00;

ADMUX=ADC_VREF_TYPE & 0xff; ADCSRA=0x83;

SPCR=0x00;

TWCR=0x00;

while (1)

{

for(k=0;k<16;k++)

{

if(bt1==0)

{

for(i=0;i<8;i++)

{

data=(data<<1)|0x01; delay_ms(100);

}

}

if(bt2==0)

{

for(i=0;i<8;i++)

{

data=(data>>1); delay_ms(100);

}

}

}

Bài 1d : Dùng 1 nút nhấn

Bật nút 8 đèn sáng của PORTX Thả nút 8 đèn tắt của PORTX

#include <mega8.h>

#include <delay.h>

#define data PORTB

#define bt1 PIND.0

#define ADC_VREF_TYPE 0x00

unsigned int read_adc(unsigned char adc_input) {

ADMUX=adc_input | (ADC_VREF_TYPE & 0xff); delay_us(10);

ADCSRA|=0x40;

while ((ADCSRA & 0x10)==0);

ADCSRA|=0x10;

return ADCW;

}

void main(void)

{

PORTB=0x00;

DDRB=0xff;

PORTC=0x00;

DDRC=0x00;

PORTD=0x0f;

DDRD=0x0f;

TCCR0=0x00;

TCNT0=0x00;

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

MCUCR=0x00;

TIMSK=0x00;

UCSRB=0x00;

ACSR=0x80;

SFIOR=0x00;

ADMUX=ADC_VREF_TYPE & 0xff; ADCSRA=0x83;

SPCR=0x00;

TWCR=0x00;

while (1)

{

if(bt1==0)

{

data=0xff;

delay_ms(30);

}

if(bt1==1)

{

data=0x00;

delay_ms(30);

}

}

Bài 1e : Dùng 4 nút nhấn

Nút nhấn bt1 led PORTX.0 sáng Nút nhấn bt2 led PORTX.1 sáng Nút nhấn bt3 led PORTX.2 sáng Nút nhấn bt4 led PORTX.3 sáng.

#include <mega8.h>

#include <delay.h>

#define data PORTB

#define bt1 PIND.0

#define bt2 PIND.1

#define bt3 PIND.2

#define bt4 PIND.3

#define ADC_VREF_TYPE 0x00

unsigned int read_adc(unsigned char adc_input) {

ADMUX=adc_input | (ADC_VREF_TYPE & 0xff); delay_us(10);

ADCSRA|=0x40;

while ((ADCSRA & 0x10)==0);

ADCSRA|=0x10;

return ADCW;

}

void tatled()

{

data=0x00;

}

void main(void)

{

PORTB=0x00;

DDRB=0xff;

PORTC=0x00;

DDRC=0x00;

PORTD=0x0f;

DDRD=0x0f;

TCCR0=0x00;

TCNT0=0x00;

TCCR1A=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

MCUCR=0x00;

TIMSK=0x00;

UCSRB=0x00;

ACSR=0x80;

SFIOR=0x00;

ADMUX=ADC_VREF_TYPE & 0xff; ADCSRA=0x83;

SPCR=0x00;

TWCR=0x00;

while (1)

{

if(bt1==0)

{

data=0x01;

delay_ms(50);

}

if(bt2==0)

{

data=0x02;

delay_ms(50);

}

if(bt3==0)

data=0x04;

delay_ms(50);

}

if(bt4==0)

{

data=0x08;

delay_ms(50);

}

}

}

Bài 1f : Chạy 8 led từ PORTX.0 -> PORTX.7… không lưu led.

#include <mega8.h>

#include <delay.h>

#define data PORTB

#define ADC_VREF_TYPE 0x00

unsigned int read_adc(unsigned char adc_input)

{

ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);

delay_us(10);

ADCSRA|=0x40;

while ((ADCSRA & 0x10)==0);

ADCSRA|=0x10;

return ADCW;

}

void main(void)

{

PORTB=0x00;

DDRB=0xff;

PORTC=0x00;

DDRC=0x00;

PORTD=0x00;

DDRD=0x00;

TCCR0=0x00;

TCNT0=0x00;

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

MCUCR=0x00;

TIMSK=0x00;

UCSRB=0x00;

ACSR=0x80;

SFIOR=0x00;

ADMUX=ADC_VREF_TYPE & 0xff; ADCSRA=0x83;

SPCR=0x00;

TWCR=0x00;

while (1)

{

data=0x01;

delay_ms(100);

data=0x02;

delay_ms(100);

data=0x04;

delay_ms(100);

data=0x08;

delay_ms(100);

data=0x10;

delay_ms(100);

data=0x20;

delay_ms(100);

delay_ms(100);

data=0x80;

delay_ms(100);

}

}

Bài 1g : Dùng 2 nút nhấn.

Nút nhấn bt1 chạy 8 led từ PORTX.0 -> PORTX.7… không lưu led Nút nhấn bt2 chạy 8 led từ PORTX.7 -> PORTX.0… không lưu led

#include <mega8.h>

#include <delay.h>

#define data PORTB

#define bt1 PIND.0

#define bt2 PIND.1

#define ADC_VREF_TYPE 0x00

unsigned int read_adc(unsigned char adc_input)

{

ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);

delay_us(10);

ADCSRA|=0x40;

while ((ADCSRA & 0x10)==0);

ADCSRA|=0x10;

return ADCW;

}

void tatled()

{

data=0x00;

}

void main(void)

{

PORTB=0x00;

DDRB=0xff;

PORTC=0x00;

DDRC=0x00;

PORTD=0x0f;

DDRD=0x0f;

TCNT0=0x00;

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

MCUCR=0x00;

TIMSK=0x00;

UCSRB=0x00;

ACSR=0x80;

SFIOR=0x00;

ADMUX=ADC_VREF_TYPE & 0xff; ADCSRA=0x83;

SPCR=0x00;

TWCR=0x00;

while (1)

{

tatled();

if(bt1==0)

{

data=0x01;

delay_ms(100);

data=0x02;

delay_ms(100);

delay_ms(100); data=0x08; delay_ms(100); data=0x10; delay_ms(100); data=0x20; delay_ms(100); data=0x40; delay_ms(100); data=0x80; delay_ms(100); }

tatled();

if(bt2==0) {

data=0x80; delay_ms(100); data=0x40; delay_ms(100); data=0x20; delay_ms(100); data=0x10; delay_ms(100); data=0x08; delay_ms(100); data=0x04; delay_ms(100); data=0x02; delay_ms(100); data=0x01; delay_ms(100); }

}

}

Bài 2 Dùng 2 nút nhấn ĐK ngắt ngoài.

1 nút nhấn bt1 đếm lên từ số 0 -> 9 (led 7 đoạn)

1 nút nhấn bt2 đếm xuống từ số 9 -> 0.

#include <mega8.h>

#include <delay.h>

#define bt1 PIND.2

#define bt2 PIND.3

unsigned char dem;

interrupt [EXT_INT0] void ext_int0_isr(void)

{

dem++;

}

interrupt [EXT_INT1] void ext_int1_isr(void)

{

dem ;

}

#define ADC_VREF_TYPE 0x00

unsigned int read_adc(unsigned char adc_input)

{

ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);

delay_us(10);

ADCSRA|=0x40;

while ((ADCSRA & 0x10)==0);

ADCSRA|=0x10;

return ADCW;

}

void main(void)

{

PORTB=0x00;

DDRB=0xff;

PORTC=0x00;

DDRC=0x00;

PORTD=0x0f;

TCNT0=0x00;

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

GICR|=0xC0;

MCUCR=0x0B;

GIFR=0xC0;

TIMSK=0x00;

UCSRB=0x00;

ACSR=0x80;

SFIOR=0x00;

ADMUX=ADC_VREF_TYPE & 0xff; ADCSRA=0x84;

SPCR=0x00;

TWCR=0x00;

#asm("sei")

while (1)

{

bt1=dem;

if(dem>9) dem=0;

PORTB=dem;

bt2=dem;

if(dem<0) dem=9;

PORTB=dem;

}

}

Bài 3 : Viết chương trình hiển thị lần lượt các số từ 0 đến 9 lên LED 7 đoạn

#include <mega8.h>

#include <delay.h>

unsigned char i;

unsigned char so[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};

#define ADC_VREF_TYPE 0x00

unsigned int read_adc(unsigned char adc_input)

{

ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);

delay_us(10);

ADCSRA|=0x40;

while ((ADCSRA & 0x10)==0);

ADCSRA|=0x10;

return ADCW;

}

void main(void)

{

PORTB=0x00;

DDRB=0xff;

PORTC=0x00;

DDRC=0x00;

PORTD=0x00;

DDRD=0x00;

TCCR0=0x00;

TCNT0=0x00;

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

MCUCR=0x00;

TIMSK=0x00;

UCSRB=0x00;

ACSR=0x80;

SFIOR=0x00;

ADMUX=ADC_VREF_TYPE & 0xff; ADCSRA=0x84;

SPCR=0x00;

TWCR=0x00;

while (1)

{

for(i=0;i<10;i++)

{

PORTB=so[i];

delay_ms(100);

}

}

}