Page 119 - MDP2020-3

················································································ 명장양성프로젝트 【MDP】 과제발표회 자료집 Ⅲ | 113

다) 초음파 센서 2개와 터미널을 사용하여 거리 측정
#include <mega128a.h>

#include <stdio.h>
#include <delay.h>
#asm
.equ __lcd_port=0x1b; //PORTA
#endasm

#include <lcd.h> //LCD 제어 함수를 사용을 위해 추가

//에코 핀에서 출력되는 펄스의 길이를 저장하는 전역변수
unsigned int dist;
unsigned int dist2;

int i;

void init_uart0(void)
{
//시리얼 통신을 통한 디버깅용

UCSR0A=0b00000000;
UCSR0B=0b10011000;
UCSR0C=0b10000110;
UBRR0H=0;
UBRR0L=103;

printf("STARTING SYSTEM ... \n\r");
}
void init_uart1(void)
{
//시리얼 통신을 통한 디버깅용

UCSR0A=0b00000000;
UCSR0B=0b10011000;
UCSR0C=0b10000110;
UBRR0H=0;
UBRR0L=103;

}

void TC0_cnt()
{
TCCR0 = 0b00000010; //normal mode, prescaler = 8

TIMSK = 0b00000000; //tc0 ovf interrput : disable;
TCNT0 = 253;

//(16MHz^-1) * 8 * (255 - 253) = 1us;