Honda Car Keyfob

README.md

@@ -337,6 +337,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
     [249]  Bresser lightning
     [250]  Schou 72543 Day Rain Gauge, Motonet MTX Rain, MarQuant Rain Gauge
     [251]  Fine Offset / Ecowitt WH55 water leak sensor
+    [252]  Honda Keyfob KR5V2X/1X
 
 * Disabled by default, use -R n or a conf file to enable
 
@@ -346,7 +347,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
   [-d <RTL-SDR USB device index>] (default: 0)
   [-d :<RTL-SDR USB device serial (can be set with rtl_eeprom -s)>]
 	To set gain for RTL-SDR use -g <gain> to set an overall gain in dB.
-	SoapySDR device driver is available.
+	SoapySDR device driver is not available.
   [-d ""] Open default SoapySDR device
   [-d driver=rtlsdr] Open e.g. specific SoapySDR device
 	To set gain for SoapySDR use -g ELEM=val,ELEM=val,... e.g. -g LNA=20,TIA=8,PGA=2 (for LimeSDR).

conf/rtl_433.example.conf

@@ -478,6 +478,7 @@ convert si
   protocol 249 # Bresser lightning
   protocol 250 # Schou 72543 Day Rain Gauge, Motonet MTX Rain, MarQuant Rain Gauge
   protocol 251 # Fine Offset / Ecowitt WH55 water leak sensor
+  protocol 252 # Honda Keyfob KR5V2X/1X
 
 ## Flex devices (command line option "-X")
 

include/rtl_433_devices.h

@@ -259,6 +259,7 @@
     DECL(bresser_lightning) \
     DECL(schou_72543_rain) \
     DECL(fineoffset_wh55) \
+    DECL(honda_keyfob) \
 
     /* Add new decoders here. */
 

man/man1/rtl_433.1

@@ -168,7 +168,7 @@ RTL\-SDR device driver is available.
 To set gain for RTL\-SDR use \-g <gain> to set an overall gain in dB.
 .RE
 .RS
-SoapySDR device driver is available.
+SoapySDR device driver is not available.
 .RE
 .TP
 [ \fB\-d\fI ""\fP ]

src/CMakeLists.txt

@@ -133,6 +133,7 @@ add_library(r_433 STATIC
     devices/hcs200.c
     devices/hideki.c
     devices/holman_ws5029.c
+    devices/honda_kr5vxx.c
     devices/hondaremote.c
     devices/honeywell.c
     devices/honeywell_cm921.c

src/devices/honda_kr5vxx.c

@@ -0,0 +1,120 @@
+/** @file
+    Honda Car Key FCCID KR5V2X and KR5V1X
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+*/
+
+/**
+        Decoder for Honda Car Keyfob
+        FCCID KR5V2X
+        Frequency 433.66 MHz or 434.18 MHz
+
+        FCCID KR5V1X
+        Frequency 313.55 MHz or 314.15 MHz
+
+        Signal is 2FSK, 15 kHz deviation, datarate(baud) 16.66 kbps
+        Device uses Manchester encoded pulses of 60 us and 120 us
+        Data packets are usually 180 bits (with entire sync)
+        Data packet starts with sync of 0xFFFFFFFFFFF
+        Data layout after sync:
+           MMMMMM HH DDDDDDDD EE NNNNNN RRRRRRRR CC
+
+ 	- M: 24 bit Manufacturer ID
+  	- H: 8 bit indicator of packet number (keyfob button press sends packet 2 times, receiver requires both packets. 0x08 is first packet, 0x0a is second packet)
+   	- D: 32 bit Device ID of keyfob
+    	- E: 8 bit Keyfob command (event)
+     	- N: 24 bit counter
+      	- R: 32 bit Rolling Code
+       	- C: 8 bit CRC, OPENSAFETY poly 0x2f init 0x00
+
+ 	Flex decoder: rtl_433 -f 433657000 -R 0 -X 'n=honda,m=FSK_MC_ZEROBIT,s=60,l=120,r=75000,preamble={32}0xffffec0f'
+*/
+
+
+
+#include "decoder.h"
+
+static int honda_decode(r_device *decoder, bitbuffer_t *bitbuffer){
+        if (bitbuffer->num_rows > 1){ return DECODE_ABORT_EARLY; } //should only be 1 row
+
+	if( bitbuffer->bits_per_row[0] < 150 || bitbuffer->bits_per_row[0] > 184 ){ return DECODE_ABORT_EARLY; }
+
+	uint16_t bit_offset;
+        uint8_t const preamble[] = {0xEC, 0x0F, 0x62};  //honda keyfob manufacture code
+	bit_offset = bitbuffer_search(bitbuffer, 0, 0, preamble, sizeof(preamble) * 8);
+	if( bit_offset >= bitbuffer->bits_per_row[0] ||
+	    (bit_offset + 136) > bitbuffer->bits_per_row[0] ){ return DECODE_ABORT_EARLY; }
+
+
+	uint8_t b[16];
+	bitbuffer_extract_bytes( bitbuffer, 0, bit_offset + 16, b, 120); //extract 120 bits after sync, excluding first 2 bytes of manufacture code
+
+	char const *event = "Unknown";
+	int device_id = ((unsigned)b[2] << 24) | (b[3] << 16) | (b[4] << 8) | (b[5]);
+	int device_counter = (b[7] << 16) | (b[8] << 8) | (b[9]);  //keyfob counter hex value
+	int rolling_code = ((unsigned)b[10] << 24) | (b[11] << 16) | (b[12] << 8) | (b[13]);
+
+	switch( b[6] ){
+		case 0x21:
+			event = "Lock";
+			break;
+		case 0x22:
+			event = "Unlock";
+			break;
+		case 0x24:
+			event = "Trunk";
+			break;
+		case 0x2d:
+			event = "RemoteStart";
+			break;
+		case 0x27:
+			event = "Emergency";
+			break;
+	}
+
+
+	int crc_value = crc8(b, 14, 0x2f, 0x00); //OPENSAFETY-CRC8
+	if( crc_value != (b[14])){
+			decoder_log(decoder, 1, __func__, "CRC error");
+			return DECODE_FAIL_MIC;
+	}
+
+	data_t *data = data_make(
+			"model",        "model",      	DATA_STRING, "Honda Keyfob KR5V2X/1X",
+			"id",	"Device ID",	DATA_FORMAT, "%08x", DATA_INT, device_id,
+			"event",	"Event",	DATA_STRING, event,
+			"counter","Counter",	DATA_FORMAT, "%06x", DATA_INT, device_counter,
+			"code",	"Code",	DATA_FORMAT, "%08x", DATA_INT, rolling_code,
+			"mic",		"Integrity",	DATA_STRING, "CRC",
+			NULL);
+
+	decoder_output_data(decoder, data);
+	return 1;
+}
+
+
+static char const *const output_fields[] = {
+	"model",
+	"id",
+	"event",
+	"counter",
+	"code",
+	"mic",
+	NULL,
+};
+
+
+r_device const honda_keyfob = {
+	.name        = "Honda Keyfob KR5V2X/1X",
+	.modulation  = FSK_PULSE_MANCHESTER_ZEROBIT,
+	.short_width = 60,
+	.long_width  = 120,
+	.gap_limit   = 1000,  //this gap is kinda irrelevant
+	.reset_limit = 75000,
+	.decode_fn   = &honda_decode,
+	.fields      = output_fields,
+};