Add Support BMW Gen3 TPMS (#2900)
* Add Support BMW Gen3 TPMS * Minor Fix issue number * Minor Fix Docs * Minor Fix Docs * Fix BMW Gen3 Temperature offset 40
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Bruno OCTAU
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4 changed files with 135 additions and 0 deletions
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@ -342,6 +342,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
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[254] Thermor DG950 weather station
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[255] Mueller Hot Rod water meter
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[256] ThermoPro TP28b Super Long Range Wireless Meat Thermometer for Smoker BBQ Grill
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[257] BMW Gen3 TPMS
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* Disabled by default, use -R n or a conf file to enable
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@ -264,6 +264,7 @@
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DECL(thermor) \
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DECL(mueller_hotrod) \
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DECL(thermopro_tp28b) \
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DECL(tpms_bmwg3) \
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/* Add new decoders here. */
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@ -236,6 +236,7 @@ add_library(r_433 STATIC
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devices/tpms_abarth124.c
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devices/tpms_ave.c
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devices/tpms_bmw.c
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devices/tpms_bmw_g3.c
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devices/tpms_citroen.c
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devices/tpms_eezrv.c
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devices/tpms_elantra2012.c
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132
src/devices/tpms_bmw_g3.c
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132
src/devices/tpms_bmw_g3.c
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@ -0,0 +1,132 @@
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/** @file
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BMW Gen3 TPMS sensor.
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Copyright (C) 2024 Bruno OCTAU (ProfBoc75), \@Billymazze
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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*/
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/**
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BMW Gen3 TPMS sensor.
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issue #2893 BMW Gen3 TPMS support open by \@Billymazze
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Last progress based on this:
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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\}"
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codes : {89}1c50f1758545f8020373428
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RF signal:
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FSK, PCM, s=l=52 µs, Differential Manchester
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Data layout{89} 11 x 8:
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Byte Position 0 1 2 3 4 5 6 7 8 9 10 11
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Data Layout [II II II II PP TT F1 F2 F3]CC CC 8
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Sample 1c 50 f1 75 85 45 f8 02 03 73 42 8
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- II:{32} ID, hexa 0x1c50f175 or decimal value 475066741
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- PP:{8}: Tire pressure, PSI = (PP - 43) * 0.363 or kPa = ( PP - 43 ) * 2.5
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- TT:{8}: Temperature in C offset 40
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- F1, F2, F3: Flags that could contain battery information, flat tire, lost of pressure ...
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- CC: CRC-16 bits, poly 0x1021, init 0x0000 [from previous 9 bytes].
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- 8: useless trailing bit
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*/
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#include "decoder.h"
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static int tpms_bmwg3_decode(r_device *decoder, bitbuffer_t *bitbuffer)
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{
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bitbuffer_t decoded = { 0 };
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uint8_t *b;
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// preamble = 0xcccd
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uint8_t const preamble_pattern[] = {0xcc, 0xcd};
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if (bitbuffer->num_rows != 1) {
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decoder_logf(decoder, 2, __func__, "row error");
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return DECODE_ABORT_EARLY;
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}
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int pos = 0;
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pos = bitbuffer_search(bitbuffer, 0, 0, preamble_pattern, 16);
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if (pos >= bitbuffer->bits_per_row[0]) {
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decoder_logf(decoder, 1, __func__, "Preamble not found");
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return DECODE_ABORT_EARLY;
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}
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decoder_log_bitrow(decoder, 1, __func__, bitbuffer->bb[0], bitbuffer->bits_per_row[0], "MSG");
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bitbuffer_differential_manchester_decode(bitbuffer, 0, pos + sizeof(preamble_pattern) * 8, &decoded, 88); // 11 * 8
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decoder_log_bitrow(decoder, 2, __func__, decoded.bb[0], decoded.bits_per_row[0], "DMC");
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if (decoded.bits_per_row[0] < 88) {
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decoder_logf(decoder, 2, __func__, "Too short");
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return DECODE_ABORT_LENGTH;
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}
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b = decoded.bb[0];
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if (crc16(b, 11, 0x1021, 0x0000)) {
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decoder_logf(decoder, 1, __func__, "crc error, expected %02x%02x, calculated %04x", b[9], b[10], crc16(b, 11, 0x1021, 0x0000));
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return DECODE_FAIL_MIC; // crc mismatch
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}
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decoder_log(decoder, 1, __func__, "BMW G3 found");
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float pressure_kPa = (b[4] - 43) * 2.5f;
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float temperature_C = (b[5] - 40);
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int flags1 = b[6]; // fixed value to 0xf8 could be Brand ID ?
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int flags2 = b[7]; // Battery , pressure warning ?
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int flags3 = b[8]; // fixed value to 0x03 could be Brand ID ?
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uint32_t id = ((uint32_t)b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
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char msg_str[23];
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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]);
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/* clang-format off */
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data_t *data = data_make(
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"model", "", DATA_STRING, "BMW-GEN3",
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"type", "", DATA_STRING, "TPMS",
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//"id", "", DATA_FORMAT, "%08x", DATA_INT, id,
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"id", "", DATA_INT, id,
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"pressure_kPa", "Pressure", DATA_FORMAT, "%.1f kPa", DATA_DOUBLE, (double)pressure_kPa,
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"temperature_C", "Temperature", DATA_FORMAT, "%.1f C", DATA_DOUBLE, temperature_C,
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"flags1", "", DATA_FORMAT, "%08b", DATA_INT, flags1,
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"flags2", "", DATA_FORMAT, "%08b", DATA_INT, flags2,
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"flags3", "", DATA_FORMAT, "%08b", DATA_INT, flags3,
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"msg", "msg", DATA_STRING, msg_str, // To remove after guess all tags
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"mic", "Integrity", DATA_STRING, "CRC",
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NULL);
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/* clang-format on */
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decoder_output_data(decoder, data);
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return 1;
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}
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static char const *const output_fields[] = {
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"model",
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"type",
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"id",
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"battery_ok",
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"pressure_kPa",
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"flags1",
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"flags2",
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"flags3",
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"msg",
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"mic",
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NULL,
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};
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r_device const tpms_bmwg3 = {
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.name = "BMW Gen3 TPMS",
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.modulation = FSK_PULSE_PCM,
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.short_width = 52,
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.long_width = 52,
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.reset_limit = 160,
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.decode_fn = &tpms_bmwg3_decode,
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.fields = output_fields,
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};
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