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Add support for Bresser Lightning and Bresser Air Quality (#2698)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| /** @file | ||
| Bresser Lightning Sensor. | ||
| Copyright (C) 2023 The rtl_433 Project | ||
| 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. | ||
| */ | ||
|
|
||
| #include "decoder.h" | ||
|
|
||
| #define SENSOR_TYPE_LIGHTNING 9 | ||
|
|
||
| /** | ||
| Bresser Lightning Sensor. | ||
| Decoder for Bresser lightning outdoor sensor, PN 7009976 | ||
| see https://github.com/merbanan/rtl_433/issues/2140 | ||
| Preamble: aa aa 2d d4 | ||
| Data layout: | ||
| DIGEST:8h8h ID:8h8h CTR:12h BATT:1b ?3b STYPE:4h STARTUP:1b CH:3d KM:8d ?8h8h | ||
| Based on bresser_7in1.c | ||
| The data (not including STYPE, STARTUP, CH and maybe ID) has a whitening of 0xaa. | ||
| CH is always 0. | ||
| First two bytes are an LFSR-16 digest, generator 0x8810 key 0xabf9 with a final xor 0x899e | ||
| */ | ||
|
|
||
| static int bresser_lightning_decode(r_device *decoder, bitbuffer_t *bitbuffer) | ||
| { | ||
| uint8_t const preamble_pattern[] = {0xaa, 0xaa, 0x2d, 0xd4}; | ||
| uint8_t msg[25]; | ||
|
|
||
| if (bitbuffer->num_rows != 1 | ||
| || bitbuffer->bits_per_row[0] < 160 | ||
| || bitbuffer->bits_per_row[0] > 440) { | ||
| decoder_logf(decoder, 2, __func__, "bit_per_row %u out of range", bitbuffer->bits_per_row[0]); | ||
| return DECODE_ABORT_EARLY; // Unrecognized data | ||
| } | ||
|
|
||
| unsigned start_pos = bitbuffer_search(bitbuffer, 0, 0, | ||
| preamble_pattern, sizeof (preamble_pattern) * 8); | ||
|
|
||
| if (start_pos >= bitbuffer->bits_per_row[0]) { | ||
| return DECODE_ABORT_LENGTH; | ||
| } | ||
| start_pos += sizeof (preamble_pattern) * 8; | ||
|
|
||
| unsigned len = bitbuffer->bits_per_row[0] - start_pos; | ||
| if (len < sizeof(msg) * 8) { | ||
| decoder_logf(decoder, 2, __func__, "%u too short", len); | ||
| return DECODE_ABORT_LENGTH; // message too short | ||
| } | ||
|
|
||
| bitbuffer_extract_bytes(bitbuffer, 0, start_pos, msg, sizeof(msg) * 8); | ||
|
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| decoder_log_bitrow(decoder, 2, __func__, msg, sizeof(msg) * 8, "MSG"); | ||
|
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| int s_type = msg[6] >> 4; | ||
| int chan = msg[6] & 0x07; | ||
| int battery_low = (msg[5] & 0x08) >> 3; | ||
| int nstartup = (msg[6] & 0x08) >> 3; | ||
|
|
||
| // data de-whitening | ||
| for (unsigned i = 0; i < sizeof (msg); ++i) { | ||
| msg[i] ^= 0xaa; | ||
| } | ||
| decoder_log_bitrow(decoder, 2, __func__, msg, sizeof(msg) * 8, "XOR"); | ||
|
|
||
| // LFSR-16 digest, generator 0x8810 key 0xba95 final xor 0x6df1 | ||
| int chk = (msg[0] << 8) | msg[1]; | ||
| int digest = lfsr_digest16(&msg[2], 23, 0x8810, 0xba95); | ||
| if ((chk ^ digest) != 0x6df1) { | ||
| decoder_logf(decoder, 2, __func__, "Digest check failed %04x vs %04x (%04x)", chk, digest, chk ^ digest); | ||
| return DECODE_FAIL_MIC; | ||
| } | ||
|
|
||
| int sensor_id = (msg[2] << 8) | (msg[3]); | ||
| int distance_km = msg[7]; | ||
| int count = (msg[4] << 4) | (msg[5] & 0xf0) >> 4; | ||
| int unknown1 = ((msg[5] & 0x0f) << 8) | msg[6]; | ||
| int unknown2 = (msg[8] << 8) | msg[9]; | ||
|
|
||
| // Sanity checks | ||
| if ((s_type != SENSOR_TYPE_LIGHTNING) || (chan != 0)) { | ||
| return DECODE_FAIL_SANITY; | ||
| } | ||
|
|
||
| /* clang-format off */ | ||
| data_t *data = data_make( | ||
| "model", "", DATA_STRING, "Bresser-Lightning", | ||
| "id", "", DATA_FORMAT, "%08x", DATA_INT, sensor_id, | ||
| "startup", "Startup", DATA_COND, !nstartup, DATA_INT, !nstartup, | ||
| "battery_ok", "Battery", DATA_INT, !battery_low, | ||
| "distance_km", "storm_distance_km", DATA_INT, distance_km, | ||
| "strike_count", "strike_count", DATA_INT, count, | ||
| "unknown1", "Unknown1", DATA_FORMAT, "%08x", DATA_INT, unknown1, | ||
| "unknown2", "Unknown2", DATA_FORMAT, "%08x", DATA_INT, unknown2, | ||
| "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", | ||
| "id", | ||
| "startup", | ||
| "battery_ok", | ||
| "distance_km", | ||
| "strike_count", | ||
| "unknown1", | ||
| "unknown2", | ||
| NULL, | ||
| }; | ||
|
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||
| r_device const bresser_lightning = { | ||
| .name = "Bresser lightning", | ||
| .modulation = FSK_PULSE_PCM, | ||
| .short_width = 124, | ||
| .long_width = 124, | ||
| .reset_limit = 25000, | ||
| .decode_fn = &bresser_lightning_decode, | ||
| .fields = output_fields, | ||
| }; |