// Rapsberry Pi: 1-wire in C - Versione 0.7 - Luglio 2014
// Copyright (c) 2013, Vincenzo Villa (https://www.vincenzov.net)
// Creative Commons | Attribuzione-Condividi allo stesso modo 3.0 Unported.
// Creative Commons | Attribution-Share Alike 3.0 Unported
// https://www.vincenzov.net/tutorial/RaspberryPi/1-wire.htm

// Compile:  gcc 1-wire-th.c -std=gnu99 -o 1-wire-th
// vv@vvrpi ~ $ ./1-wire-th [addr2] [addr1] [addr3] ...
// addrX = Optional ROM-ID (e.g.: 10-000802d3a98b) - Up to 10

// Using 1-wire

#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <stdlib.h>
#include <string.h>

#define MAX_WIRE 10                                     // Driver limite
#define ONE_WIRE_DIR "/sys/devices/w1_bus_master1/"
#define ONE_WIRE_FILE "/w1_slave"
#define SEARCH_ONE_WIRE "ls /sys/devices/w1_bus_master1/*/w1_slave"
#define RECORD 255

static void exit_on_error (const char *s)	// Exit and print error code
{ 	perror(s);
  	abort();
} 

int main(int argc, char *argv[])
{
        char one_wire_file_name[MAX_WIRE][255];  // device filename     
        int one_wire_found=0;                    // Device found (or user supplied)

        FILE *command;                           // Output for search device

        FILE *device;                            // Slave file
        char device_line[RECORD];
        char *device_substring;
        
        printf("Rapsberry Pi: 1-wire in C - Versione 0.7 - Luglio 2014\n");
        printf("Copyright (c) 2013, Vincenzo Villa (https://www.vincenzov.net)\n");
        printf("Creative Commons | Attribuzione-Condividi allo stesso modo 3.0 Unported.\n");
        printf("Creative Commons | Attribution-Share Alike 3.0 Unported\n");
        printf("https://www.vincenzov.net/tutorial/RaspberryPi/1-wire.htm\n\n");                                       
        printf ( "Usage: \n rpi ~ $ ./1-wire-th [ROM-ID-1] [ROM-ID-2] [ROM-ID-3]...\n ROM-ID-X = Optional ROM-ID (e.g.: 10-000802d3a98b) - Up to 10\n\n");        

        if (argc < 2) 
                { 
                 printf("No user data, autodetect 1-wire devices...\n\n");
                 
                 command = popen (SEARCH_ONE_WIRE, "r");
                 if (command == NULL) exit_on_error("Failed to run command\n" );
                 
                 for (one_wire_found; one_wire_found<MAX_WIRE && fgets(one_wire_file_name[one_wire_found], 255, command); one_wire_found++) 
                    one_wire_file_name [one_wire_found][strlen(one_wire_file_name[one_wire_found])-1] = 0 ;
                       
                 pclose(command);                         
                }
        else
                {
                   if (argc > MAX_WIRE) exit_on_error ("Too many ROM-ID");
                   
                   for (int i=2; i <= argc; i++, one_wire_found++)
                   {
                    strcpy (one_wire_file_name[i-2], ONE_WIRE_DIR);
                    strcat (one_wire_file_name[i-2],  argv[i-1]);
                    strcat (one_wire_file_name[i-2], ONE_WIRE_FILE);                    
                   }                                             
                                                 
                 }                                    
       printf("\n\nTesting %d 1-wire devices:\n\n", one_wire_found);

       for (int i=0; i<one_wire_found; i++) 
              {
               printf("Device %d: %s ", i, one_wire_file_name[i]);
               device = fopen( one_wire_file_name[i], "r");  // Open slave file
               if (device != NULL)
               {
                fgets(device_line, RECORD, device);           // skip first line   
                fgets(device_line, RECORD, device);
                device_substring = strstr (device_line,"t=");
                *device_substring++;                          // skip "t=" chars
                *device_substring++;
                printf("  T = %.1f °C \n", device_line,  atof (device_substring) /1000);
                fclose (device);
               }
               else printf("  ERROR! Wrong ROM-ID?\n");
              }


        return (0);

}