1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
//---------------------------------------------------------------
// CVAVR
//---------------------------------------------------------------
#include <mega128.h>
#include <delay.h>
//
#define COM1 (PORTA&=~0x80)
#define COM2 (PORTA&=~0x40)
#define COM3 (PORTA&=~0x20)
#define COM4 (PORTA&=~0x10)
//
char seg_pat[16]={
    0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71
};
//
signed char run=0,msec=0,sec=0;
//
void main(){
  PORTE=0x30; // 스위치풀업저항
  DDRA=0xF0;  // TR21 7-segment common anode, low active
  DDRB=0xFF;  // ULN2803 7-segment a~g, high active
  while(1){
    PORTB=seg_pat[ sec/10]; COM1; delay_us(2500); PORTA|=0xF0;
    PORTB=seg_pat[ sec%10]; COM2; delay_us(2500); PORTA|=0xF0;
    PORTB=seg_pat[msec/10]; COM3; delay_us(2500); PORTA|=0xF0;
    PORTB=seg_pat[msec%10]; COM4; delay_us(2500); PORTA|=0xF0;
    //
    if(run){ // run=1일 때만 카운터 증가
      if(++msec>99){ msec=0;
        if(++sec>99)sec=0; // 59로 바꾸면 0~59
      }
    }
    //
    if(!(PINE&0x10)){ // PE4, 스타트/스톱
        run^=1; // 1은 0으로, 0은 1로 변경
        delay_ms(100); while(!(PINE&0x10)); delay_ms(100); // 채터링,디바운스
    }
    if(!(PINE&0x20)){ sec=0,msec=0; stop=1; } // PE5, 리셋
  }
}
 
 
 
 
//---------------------------------------------------------------
// AVRStudio
//---------------------------------------------------------------
#include <avr/io.h>
#define  F_CPU 16000000UL // 16 MHz
#include <util/delay.h>
//
#define FND_COM1 (PORTA&=~0x80)
#define FND_COM2 (PORTA&=~0x40)
#define FND_COM3 (PORTA&=~0x20)
#define FND_COM4 (PORTA&=~0x10)
//
char seg_pat[16]={
    0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71
};
//
signed char run=0,msec=0,sec=0;
//
int main(){
  PORTE=0x30; // 스위치풀업저항
  DDRB=0xFF; // ULN2803 7-segment a~g, high active
  DDRA=0xF0; // TR21 7-segment common anode, low active
  while(1){
    PORTB=seg_pat[ sec/10]; COM1; _delay_us(2500); PORTA|=0xF0;
    PORTB=seg_pat[ sec%10]; COM2; _delay_us(2500); PORTA|=0xF0;
    PORTB=seg_pat[msec/10]; COM3; _delay_us(2500); PORTA|=0xF0;
    PORTB=seg_pat[msec%10]; COM4; _delay_us(2500); PORTA|=0xF0;
    //
    if(run){ // run=1일 때만 카운터 증가
      if(++msec>99){ msec=0;
        if(++sec>99)sec=0; // 59로 바꾸면 0~59
      }
    }
    //
    if(!(PINE&0x10)){ // PE4, 스타트/스톱
        run^=1; // 1은 0으로, 0은 1로 변경
        _delay_ms(100); while(!(PINE&0x10)); _delay_ms(100); // 채터링,디바운스
    }
    if(!(PINE&0x20)){ sec=0,msec=0; stop=1; } // PE5, 리셋
  }
}
 
Colored by Color Scripter
cs

바로 위 예제에서
포트F를 포트A로 변경하고
led를 제거했습니다.