Add Support BMW Gen3 TPMS

README.md

@@ -342,6 +342,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
     [254]  Thermor DG950 weather station
     [255]  Mueller Hot Rod water meter
     [256]  ThermoPro TP28b Super Long Range Wireless Meat Thermometer for Smoker BBQ Grill
+    [257]  BMW Gen3 TPMS
 
 * Disabled by default, use -R n or a conf file to enable
 

include/rtl_433_devices.h

@@ -264,6 +264,7 @@
     DECL(thermor) \
     DECL(mueller_hotrod) \
     DECL(thermopro_tp28b) \
+    DECL(tpms_bmwg3) \
 
     /* Add new decoders here. */
 

src/CMakeLists.txt

@@ -236,6 +236,7 @@ add_library(r_433 STATIC
     devices/tpms_abarth124.c
     devices/tpms_ave.c
     devices/tpms_bmw.c
+    devices/tpms_bmw_g3.c
     devices/tpms_citroen.c
     devices/tpms_eezrv.c
     devices/tpms_elantra2012.c

src/devices/tpms_bmw_g3.c

@@ -0,0 +1,132 @@
+/** @file
+    BMW Gen3 TPMS sensor.
+
+    Copyright (C) 2024 Bruno OCTAU (ProfBoc75), \@Billymazze
+
+    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.
+*/
+/**
+BMW Gen3 TPMS sensor.
+
+issue #2893 BMW Gen3 TPMS support open by \@Billymazze
+
+Last progress based on this:
+
+    rtl_433 -Y autolevel -Y minmax -X "n=BMW_G3,m=FSK_PCM,s=52,l=52,r=1000,preamble=cccd,decode_dm,bits>=190" *.cs8 2>&1 | grep "\{89\}"
+    codes : {89}1c50f1758545f8020373428
+
+RF signal:
+
+    FSK, PCM, s=l=52 µs, Differential Manchester
+
+Data layout{89} 11 x 8:
+
+    Byte Position  0  1  2  3  4  5  6  7  8  9 10 11
+    Data Layout  [II II II II PP TT F1 F2 F3]CC CC 8
+    Sample        1c 50 f1 75 85 45 f8 02 03 73 42 8
+
+- II:{32} ID, hexa 0x1c50f175 or decimal value 475066741
+- PP:{8}: Tire pressure, PSI = (PP - 43) * 0.363 or kPa = ( PP - 43 ) * 2.5
+- TT:{8}: Temperature in C offset 40
+- F1, F2, F3: Flags that could contain battery information, flat tire, lost of pressure ...
+- CC: CRC-16 bits, poly 0x1021, init 0x0000 [from previous 9 bytes].
+- 8: useless trailing bit
+
+*/
+
+#include "decoder.h"
+
+static int tpms_bmwg3_decode(r_device *decoder, bitbuffer_t *bitbuffer)
+{
+    bitbuffer_t decoded = { 0 };
+    uint8_t *b;
+    // preamble = 0xcccd
+    uint8_t const preamble_pattern[] = {0xcc, 0xcd};
+
+    if (bitbuffer->num_rows != 1) {
+        decoder_logf(decoder, 2, __func__, "row error");
+        return DECODE_ABORT_EARLY;
+    }
+
+    int pos = 0;
+    pos = bitbuffer_search(bitbuffer, 0, 0, preamble_pattern, 16);
+    if (pos >= bitbuffer->bits_per_row[0]) {
+        decoder_logf(decoder, 1, __func__, "Preamble not found");
+        return DECODE_ABORT_EARLY;
+    }
+
+    decoder_log_bitrow(decoder, 1, __func__, bitbuffer->bb[0], bitbuffer->bits_per_row[0], "MSG");
+
+    bitbuffer_differential_manchester_decode(bitbuffer, 0, pos + sizeof(preamble_pattern) * 8, &decoded, 88); // 11 * 8
+
+    decoder_log_bitrow(decoder, 2, __func__, decoded.bb[0], decoded.bits_per_row[0], "DMC");
+
+    if (decoded.bits_per_row[0] < 88) {
+        decoder_logf(decoder, 2, __func__, "Too short");
+        return DECODE_ABORT_LENGTH;
+    }
+
+    b = decoded.bb[0];
+
+    if (crc16(b, 11, 0x1021, 0x0000)) {
+        decoder_logf(decoder, 1, __func__, "crc error, expected %02x%02x, calculated %04x", b[9], b[10], crc16(b, 11, 0x1021, 0x0000));
+        return DECODE_FAIL_MIC; // crc mismatch
+    }
+    decoder_log(decoder, 1, __func__, "BMW G3 found");
+    float pressure_kPa      = (b[4] - 43) * 2.5f;
+    float temperature_C     = (b[5] - 40);
+    int flags1              = b[6]; // fixed value to 0xf8 could be Brand ID ?
+    int flags2              = b[7]; // Battery , pressure warning ?
+    int flags3              = b[8]; // fixed value to 0x03 could be Brand ID ?
+
+    uint32_t id             = ((uint32_t)b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
+
+    char msg_str[23];
+    snprintf(msg_str, sizeof(msg_str), "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7], b[8], b[9], b[10]);
+
+    /* clang-format off */
+    data_t *data = data_make(
+            "model",               "",                DATA_STRING, "BMW-GEN3",
+            "type",                "",                DATA_STRING, "TPMS",
+            //"id",                  "",                DATA_FORMAT, "%08x",     DATA_INT,    id,
+            "id",                  "",                DATA_INT,    id,
+            "pressure_kPa",        "Pressure",        DATA_FORMAT, "%.1f kPa", DATA_DOUBLE, (double)pressure_kPa,
+            "temperature_C",       "Temperature",     DATA_FORMAT, "%.1f C",   DATA_DOUBLE, temperature_C,
+            "flags1",              "",                DATA_FORMAT, "%08b",     DATA_INT,    flags1,
+            "flags2",              "",                DATA_FORMAT, "%08b",     DATA_INT,    flags2,
+            "flags3",              "",                DATA_FORMAT, "%08b",     DATA_INT,    flags3,
+            "msg",                 "msg",             DATA_STRING, msg_str, // To remove after guess all tags
+            "mic",                 "Integrity",       DATA_STRING, "CRC",
+            NULL);
+    /* clang-format on */
+
+    decoder_output_data(decoder, data);
+    return 1;
+}
+
+static char const *const output_fields[] = {
+        "model",
+        "type",
+        "id",
+        "battery_ok",
+        "pressure_kPa",
+        "flags1",
+        "flags2",
+        "flags3",
+        "msg",
+        "mic",
+        NULL,
+};
+
+r_device const tpms_bmwg3 = {
+        .name        = "BMW Gen3 TPMS",
+        .modulation  = FSK_PULSE_PCM,
+        .short_width = 52,
+        .long_width  = 52,
+        .reset_limit = 160,
+        .decode_fn   = &tpms_bmwg3_decode,
+        .fields      = output_fields,
+};