// arlotto 2006 c18 sur 18F452 carte PICDEM2+
// démonstration  i2c  : affichage de température sur le lcd
#include <p18cxxx.h> 

// configuration PICDEM2+ quartz
#pragma config OSC = HS
#pragma config WDT = OFF
#pragma config LVP = OFF
#pragma config PBADEN = OFF

#include <stdio.h>
#include "xlcd100.h"
#include <i2c.h>
#define BtnS2 PORTAbits.RA4

char cmd[]="\x9A\x00";
void main (void)
{
char x ;
int temp ;
 OpenI2C(MASTER,SLEW_OFF);
 SSPADD = 9 ;
  x=SSPBUF ;
  
 
 OpenXLCD(OPEN_PICDEM_LCD);
 stdout = _H_USER ;
 printf("Temp :     C");

  for(;;)
    {
        if(BtnS2 == 0 ) {
             StartI2C();
             IdleI2C();
			 WriteI2C(0x9A);  
             if(SSPCON2bits.ACKSTAT) 
             printf("A");
             else
             printf("N");
             WriteI2C(0x00);         
             RestartI2C();   
			 IdleI2C();
             WriteI2C(0x9B);            
             temp = ReadI2C();
             NotAckI2C();IdleI2C();
             StopI2C();IdleI2C();
             gotoXLCD(LCD_LINE_ONE + 6 );
             printf("%3d",temp);
        }    

    }
}