// printf
#include <stdio.h>

//O_RDWR
#include <fcntl.h>

// I2C_SLAVE
#include <linux/i2c-dev.h>

// __u8
#include <linux/types.h>

int main(void){
	printf("Programme de test de l'i2c en mode maitre\n");
	int file;
	int adapter_nr = 2; /* probably dynamically determined */
	char filename[20];
	int addr = 0x50; /* The I2C address */
	__u8 registre = 0x0; /* Device register to access */
	char buf[300];
	int i,j,ok;
	
	for (adapter_nr=0;adapter_nr < 6; adapter_nr++){

		snprintf(filename, 19, "/dev/i2c-%d", adapter_nr);
		printf("\n%s\n",filename);
		file = open(filename, O_RDWR);
		if (file < 0) {
			printf("Echec à l'ouverture\n");
			close(file);
			/* ERROR HANDLING; you can check errno to see what went wrong */
			continue;
		}
		//printf("Ouverture Ok\n");
		
		
		for (addr=80; addr < 81; addr++){
			//printf("adresse = %d\n",addr);
	
	

			if (ioctl(file, I2C_SLAVE, addr) < 0) {
				/* ERROR HANDLING; you can check errno to see what went wrong */
				//printf("Erreur adresse\n");
				continue;
			}
			//printf("Adresse Ok\n");
	
	
			/* Using I2C Write, equivalent of 
			i2c_smbus_write_word_data(file, register, 0x6543) */
			for (registre = 0;  registre< 1; registre++){
				buf[0] = registre;
				buf[1] = 0x43;
				buf[2] = 0x65;
				if ( write(file, buf, 1) != 1 ) {
					/* ERROR HANDLING: i2c transaction failed */
					//printf("erreur ecriture \n");
					continue;
				}
				i = read(file, buf, 250);
				if (i != 250) {
					/* ERROR HANDLING: i2c transaction failed */
					//printf("Erreur Lecture : %d\n",i);
					continue;
				} else {
					/* buf[0] contains the read byte */
					ok = 0;
					for(j=0;j<250;j++){
						if (buf[j] > 0){
						  ok=1;
						}else{
						  buf[j]=32;
						}
						printf("%d\t%c\t%d\n",j,buf[j],buf[j]);

					}
					/*
					if (ok == 1){
					  buf[100]='\0';
						printf("\n%s\n",filename);
						printf("adresse = %d, ",addr);
						printf("registre = %d, ",registre);
						printf("## %s\n ##",buf);
					}				*/
				
				}
			}
		}
		close(file);
	}

	
  
  return 0;
}