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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| /** @file | ||
| VDO Type TG1C FSK 9 byte Manchester encoded checksummed TPMS data. | ||
| 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. | ||
| */ | ||
|
|
||
| /** | ||
| (VDO Type TG1C via) Abarth 124 Spider TPMS decoded by TTigges | ||
| Protocol similar (and based on) Jansite Solar TPMS by Andreas Spiess and Christian W. Zuckschwerdt | ||
| OEM Sensor is said to be a VDO Type TG1C, available in different cars, | ||
| e.g.: Abarth 124 Spider, some Fiat 124 Spider, some Mazda MX-5 ND (and NC?) and probably some other Mazdas. | ||
| Mazda reference/part no.: BHB637140A | ||
| VDO reference/part no.: A2C1132410180 | ||
| Compatible with aftermarket sensors, e.g. Aligator sens.it RS3 | ||
| // Working Temperature: -50°C to 125°C | ||
| // Working Frequency: 433.92MHz+-38KHz | ||
| // Tire monitoring range value: 0kPa-350kPa+-7kPa (to be checked, VDO says 450/900kPa) | ||
| Data layout (nibbles): | ||
| II II II II ?? PP TT SS CC | ||
| - I: 32 bit ID | ||
| - ?: 4 bit unknown (seems to change with status) | ||
| - ?: 4 bit unknown (seems static) | ||
| - P: 8 bit Pressure (multiplyed by 1.38 = kPa) | ||
| - T: 8 bit Temperature (deg. C offset by 50) | ||
| - S: Status? (first nibble seems static, second nibble seems to change with status) | ||
| - C: 8 bit Checksum (Checksum8 XOR on bytes 0 to 8) | ||
| - The preamble is 0xaa..aa9 (or 0x55..556 depending on polarity) | ||
| */ | ||
|
|
||
| #include "decoder.h" | ||
|
|
||
| static int tpms_abarth124_decode(r_device *decoder, bitbuffer_t *bitbuffer, unsigned row, unsigned bitpos) | ||
| { | ||
| data_t *data; | ||
| unsigned int start_pos; | ||
| bitbuffer_t packet_bits = {0}; | ||
| uint8_t *b; | ||
| char id_str[4 * 2 + 1]; | ||
| char flags[1 * 2 + 1]; | ||
| int pressure; | ||
| int temperature; | ||
| int status; | ||
| int checksum; | ||
|
|
||
| start_pos = bitbuffer_manchester_decode(bitbuffer, row, bitpos, &packet_bits, 72); | ||
| b = packet_bits.bb[0]; | ||
|
|
||
| // check checksum (checksum8 xor) | ||
| checksum = xor_bytes(b, 9); | ||
| if (checksum != 0) { | ||
| return DECODE_FAIL_MIC; | ||
| } | ||
|
|
||
| sprintf(flags, "%02x", b[4]); | ||
| pressure = b[5]; | ||
| temperature = b[6]; | ||
| status = b[7]; | ||
| checksum = b[8]; | ||
| sprintf(id_str, "%02x%02x%02x%02x", b[0], b[1], b[2], b[3]); | ||
|
|
||
| /* clang-format off */ | ||
| data = data_make( | ||
| "model", "", DATA_STRING, "Abarth 124 Spider", | ||
| "type", "", DATA_STRING, "TPMS", | ||
| "id", "", DATA_STRING, id_str, | ||
| "flags", "", DATA_STRING, flags, | ||
| "pressure_kPa", "Pressure", DATA_FORMAT, "%.0f kPa", DATA_DOUBLE, (float)pressure * 1.38, | ||
| "temperature_C", "Temperature", DATA_FORMAT, "%.0f C", DATA_DOUBLE, (float)temperature - 50.0, | ||
| "status", "", DATA_INT, status, | ||
| "mic", "", DATA_STRING, "CHECKSUM", | ||
| NULL); | ||
| /* clang-format on */ | ||
|
|
||
| decoder_output_data(decoder, data); | ||
| return 1; | ||
| } | ||
|
|
||
| /** @sa tpms_abarth124_decode() */ | ||
| static int tpms_abarth124_callback(r_device *decoder, bitbuffer_t *bitbuffer) | ||
| { | ||
| // preamble | ||
| uint8_t const preamble_pattern[3] = {0xaa, 0xaa, 0xa9}; // after invert | ||
|
|
||
| unsigned bitpos = 0; | ||
| int events = 0; | ||
|
|
||
| bitbuffer_invert(bitbuffer); | ||
| // Find a preamble with enough bits after it that it could be a complete packet | ||
| while ((bitpos = bitbuffer_search(bitbuffer, 0, bitpos, preamble_pattern, 24)) + 80 <= | ||
| bitbuffer->bits_per_row[0]) { | ||
| events += tpms_abarth124_decode(decoder, bitbuffer, 0, bitpos + 24); | ||
| bitpos += 2; | ||
| } | ||
|
|
||
| return events; | ||
| } | ||
|
|
||
| static char *output_fields[] = { | ||
| "model", | ||
| "type", | ||
| "id", | ||
| "flags", | ||
| "pressure_kPa", | ||
| "temperature_C", | ||
| "status", | ||
| "code", | ||
| "mic", | ||
| NULL, | ||
| }; | ||
|
|
||
| r_device tpms_abarth124 = { | ||
| .name = "Abarth 124 Spider TPMS", | ||
| .modulation = FSK_PULSE_PCM, | ||
| .short_width = 52, // 12-13 samples @250k | ||
| .long_width = 52, // FSK | ||
| .reset_limit = 150, // Maximum gap size before End Of Message [us]. | ||
| .decode_fn = &tpms_abarth124_callback, | ||
| .disabled = 0, | ||
| .fields = output_fields, | ||
| }; |
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