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Rename Aston Martin Smartire to SmarTire and minor changes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| /** @file | ||
| SmarTire TPMS sensor. | ||
| Copyright (C) 2024 Bruno OCTAU (ProfBoc75) | ||
| 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. | ||
| */ | ||
|
|
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| #include "decoder.h" | ||
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| /** | ||
| SmarTire TPMS sensor. | ||
| - SmarTire Vantage / Aston Martin DB9 protocol, from 1/2005 till 12/2011 | ||
| S.a. issue #3067 | ||
| Data Layout: | ||
| - Total of 10 messages at a time, OOK PCM and Differential MC coded. | ||
| - 2 types of message have been identified. | ||
| - 1 Message with Pressure information follow by | ||
| - 1 Message with Temperature information | ||
| - Both messages are repeated 5 times | ||
| - In case of fast pressure increasing, the pressure message is sent with Fast increased flag, then the 10 messages each 2 seconds with the flag. | ||
| Flex decoder: | ||
| rtl_433 -X 'n=SmarTire-AM,m=OOK_PCM,s=167,l=167,r=600,preamble=32b4,decode_dm' | ||
| Preamble/Syncword .... : 0x32b4 | ||
| 6 bytes message | ||
| Byte Position 0 1 2 3 4 5 | ||
| Sample 28 3f ff ff 00 fa | ||
| VV |I II II || CC | ||
| | || | ||
| +----+-+ +----------+ | ||
| | 1234 | | 12345678 | | ||
| | MMII | | FFFFFFXX | | ||
| +------+ +----------+ | ||
| - VV: {8} Pressure value, offset 40, scale 2.5 if Message Type = 0x00 | ||
| Temperature Value, offset 40, if Message Type = 0x01 | ||
| - MM: {2} Message Type, 0b00 or 0b01 | ||
| - II:{22} Sensor ID, | ||
| - F : {8} Flags, F1 = quick inflate detected, | ||
| F2 to F6 are unknown, | ||
| X78:{2} Looks like XOR/checksum/Parity from previous bits, not decoded. | ||
| - C : {7} CRC-7, poly 0x45, init 0x6f, final XOR 0x00 | ||
| Bitbench: | ||
| TEMP/PRESSURE 8d MESSAGE_TYPE 2b ID 22d FAST_INCREASE 1b FLAGS ? 5b PARITY_XOR ? 2b CRC_SEVEN 7b 1x | ||
| */ | ||
|
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| static int tpms_smartire_decode(r_device *decoder, bitbuffer_t *bitbuffer) | ||
| { | ||
| bitbuffer_t decoded = { 0 }; | ||
| uint8_t *b; | ||
| uint8_t const preamble_pattern[] = {0x32, 0xb4}; | ||
| uint8_t len_msg = 6; | ||
| float pressure_kPa = 0; | ||
| int temperature_C = 0; | ||
|
|
||
| if (bitbuffer->num_rows != 1) { | ||
| return DECODE_ABORT_EARLY; | ||
| } | ||
|
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| int pos = bitbuffer_search(bitbuffer, 0, 0, preamble_pattern, sizeof(preamble_pattern) * 8); | ||
| if (pos >= bitbuffer->bits_per_row[0]) { | ||
| decoder_logf(decoder, 1, __func__, "Preamble not found"); | ||
| return DECODE_ABORT_EARLY; | ||
| } | ||
|
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| 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, len_msg * 8); | ||
| decoder_log_bitrow(decoder, 1, __func__, decoded.bb[0], decoded.bits_per_row[0], "DMC"); | ||
|
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| // check msg length | ||
| if (decoded.bits_per_row[0] < (len_msg * 8) - 1 ) { // always missing last bit | ||
| decoder_logf(decoder, 1, __func__, "Too short"); | ||
| return DECODE_ABORT_LENGTH; | ||
| } | ||
|
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| b = decoded.bb[0]; | ||
|
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| // verify checksum | ||
| if (crc7(b, len_msg, 0x45, 0x6f)) { | ||
| decoder_logf(decoder, 1, __func__, "crc error"); | ||
| return DECODE_FAIL_MIC; // crc mismatch | ||
| } | ||
|
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| int id = ((b[1] & 0x3f) << 16) | (b [2] << 8) | b[3]; | ||
| int msg_type = (b[1] & 0xc0) >> 6; | ||
| int value = b[0] - 40; | ||
|
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| if (msg_type == 0) { // pressure | ||
| pressure_kPa = value * 2.5; | ||
| } | ||
| else if (msg_type == 1) { // temperature | ||
| temperature_C = value; | ||
| } | ||
| else { | ||
| decoder_logf(decoder, 1, __func__, "Unknown message type %x", msg_type); | ||
| return DECODE_ABORT_EARLY; | ||
| } | ||
|
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| int inflate = (b[4] & 0x80) >> 7; | ||
| int flags = b[4] & 0x7f; | ||
|
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| /* clang-format off */ | ||
| data_t *data = data_make( | ||
| "model", "", DATA_STRING, "SmarTire-AM", // Aston Martin model | ||
| "type", "", DATA_STRING, "TPMS", | ||
| "id", "", DATA_INT, id, | ||
| "pressure_kPa", "Pressure", DATA_COND, msg_type == 0, DATA_FORMAT, "%.1f kPa", DATA_DOUBLE, (double)pressure_kPa, | ||
| "temperature_C", "Temperature", DATA_COND, msg_type == 1, DATA_FORMAT, "%.1f C", DATA_DOUBLE, (double)temperature_C, | ||
| "inflate", "Inflate", DATA_COND, inflate == 1, DATA_INT, 1, | ||
| "flags", "Flags", DATA_FORMAT, "%07b", DATA_INT, flags, | ||
| "mic", "Integrity", DATA_STRING, "CRC", | ||
| NULL); | ||
| /* clang-format on */ | ||
|
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| decoder_output_data(decoder, data); | ||
| return 1; | ||
| } | ||
|
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| static char const *const output_fields[] = { | ||
| "model", | ||
| "type", | ||
| "id", | ||
| "pressure_kPa", | ||
| "temperature_C", | ||
| "inflate", | ||
| "flags", | ||
| "mic", | ||
| NULL, | ||
| }; | ||
|
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| r_device const tpms_smartire = { | ||
| .name = "SmarTire TPMS sensor, Aston Martin/Vantage DB9 protocol", | ||
| .modulation = OOK_PULSE_PCM, | ||
| .short_width = 167, | ||
| .long_width = 167, | ||
| .reset_limit = 1000, | ||
| .decode_fn = &tpms_smartire_decode, | ||
| .fields = output_fields, | ||
| }; |