src/devices/elro_db286a.c

   1 /* Doorbell implementation for Elro DB286A devices
   2  *
   3  * Note that each device seems to have two codes, which alternate
   4  * for every other button press.
   5  *
   6  * Example code: 37f62a6c80
   7  *
   8  * Copyright (C) 2016 Fabian Zaremba <fabian@youremail.eu>
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include "rtl_433.h"
  16 #include "pulse_demod.h"
  17 #include "data.h"
  18 #include "util.h"
  19
  20 //33 pulses per data pattern
  21 #define DB286A_PULSECOUNT               33
  22 //5*8 = 40 bits, 7 trailing zero bits are encoded, too
  23 #define DB286A_CODEBYTES                5
  24 //Hex character count for code:
  25 //(DB286A_CODEBYTES*8)/4 (8 bits per byte, 4 bits per hex character)
  26 #define DB286A_CODECHARS                DB286A_CODEBYTES*2
  27 //Minimum data pattern repetitions (14 is maximum)
  28 #define DB286A_MINPATTERN               5
  29
  30 static int doorbell_db286a_callback(bitbuffer_t *bitbuffer) {
  31
  32         char time_str[LOCAL_TIME_BUFLEN];
  33         data_t *data;
  34         bitrow_t *bb = bitbuffer->bb;
  35         uint8_t *b = bb[1];
  36         unsigned bits = bitbuffer->bits_per_row[1];
  37
  38         char id_string[DB286A_CODECHARS+1];
  39         char *idsp = id_string;
  40
  41         unsigned i;
  42
  43         if (bits != DB286A_PULSECOUNT) {
  44                 return 0;
  45         }
  46
  47         if (count_repeats(bitbuffer, 1) < DB286A_MINPATTERN) {
  48                 return 0;
  49         }
  50
  51         //Get hex string representation of code pattern
  52         for (i = 0; i <= DB286A_CODEBYTES; i++) {
  53             idsp += sprintf(idsp, "%02x", b[i]);
  54         }
  55         id_string[DB286A_CODECHARS] = '\0';
  56
  57         local_time_str(0, time_str);
  58
  59         data = data_make(
  60                                 "time",                 "",             DATA_STRING, time_str,
  61                                 "model",                "",             DATA_STRING, "Elro DB286A",
  62                                 "code",                 "Code", DATA_STRING, id_string,
  63                                 NULL);
  64
  65         data_acquired_handler(data);
  66
  67         return 1;
  68
  69 }
  70
  71 static char *output_fields[] = {
  72     "time",
  73     "model",
  74     "code",
  75     NULL
  76 };
  77
  78 r_device elro_db286a = {
  79         .name                   = "Elro DB286A Doorbell",
  80         .modulation     = OOK_PULSE_PWM_RAW,
  81         .short_limit    = 800,
  82         .long_limit     = 1500*4,
  83         .reset_limit    = 2000*4,
  84         .json_callback  = &doorbell_db286a_callback,
  85         .disabled               = 0,
  86     .fields         = output_fields
  87 };