Cours:TP printempsM4209 TP 5 Corr

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#include "avr/io.h"
#undef F_CPU 
#define F_CPU 15000000UL
#include "util/delay.h"

//#define UCSRB	_SFR_IO8(0x01) 
//#define UCSRA	_SFR_IO8(0x02) 
//#define UDR	_SFR_IO8(0x03)
// UCSRA
//#define RXC 7
//#define TXC 6
//#define UDRE 5
//UCSRB
//#define RXEN 4
//#define TXEN 3

//const unsigned char digit7segs[16]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E}; 
void incrementBCD(unsigned char *cnt);
void decrementBCD(unsigned char *cnt);
//***********************************************************************
// main 
//*********************************************************************** 

 int main (void) {
   //unsigned char transcod7segs[]={0xFE,0xFD,0xFB,0xF7,0xEF,0xDF,0xBF,0xFF,0x00};
   //unsigned char transcod7segs[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};

   unsigned char cmpt=0,ch=128,swPresent=0,swPasse=0,etat=1; 
   while(1) { 
   // compteur simple
   //  PORTB = transcod7segs[cmpt&0x0F];
   //  DDRB = transcod7segs[(cmpt&0xF0)>>4];
     PORTB= cmpt; 
     swPresent = PINA;
     switch (etat) {
        case 0x01 : if (((swPresent & 0x03)==0x01) && ((swPasse & 0x01)==0x00)) {etat = 0x02;break;}
                    if (((swPresent & 0x03)==0x02) && ((swPasse & 0x02)==0x00)) {etat = 0x08;break;}    
        case 0x02 : if (((swPresent & 0x03)==0x02) && ((swPasse & 0x02)==0x00)) etat = 0x04;break;
        case 0x04 : etat = 0x01; break;        
        case 0x08 : if (((swPresent & 0x03)==0x01) && ((swPasse & 0x01)==0x00)) etat = 0x10;break;
        case 0x10 : etat = 0x01; break;
        default : etat = 0x01;
      }
      if (etat==0x04) incrementBCD(&cmpt);
      if (etat==0x10) decrementBCD(&cmpt);
      swPasse = swPresent;
     PORTA = ch;
     ch >>= 1; 
     if (ch == 0) ch = 128;
     _delay_ms(300); // on verra passer les caractères     
   } 
   return 0; 
 }

void incrementBCD(unsigned char *cnt) { 
  (*cnt)++;    
  if ((*cnt & 0x0F) > 0x09) *cnt += 6; 
  if ((*cnt & 0xF0) > 0x90) *cnt = 0; 
} 

void decrementBCD(unsigned char *cnt) { 
  (*cnt)--;    
  if ((*cnt & 0x0F) == 0x0F) *cnt -= 6; 
  if ((*cnt & 0xF0) == 0xF0) *cnt = 0x99; 
}