mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-12-23 19:23:09 +00:00
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
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/* Renault tires TPMS. Usually 443.92 Mhz FSK.
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*
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* Preamble + sync + Manchester bits. ~48us short pulse.
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* 9 Bytes in total not counting the preamble. */
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#include "../../app.h"
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#define USE_TEST_VECTOR 0
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static const char *test_vector =
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"...01010101010101010110" // Preamble + sync
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/* The following is Marshal encoded, so each two characters are
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* actaully one bit. 01 = 0, 10 = 1. */
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"010110010110" // Flags.
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"10011001101010011001" // Pressure, multiply by 0.75 to obtain kpa.
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// 244 kpa here.
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"1010010110011010" // Temperature, subtract 30 to obtain celsius. 22C here.
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"1001010101101001"
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"0101100110010101"
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"1001010101100110" // Tire ID. 0x7AD779 here.
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"0101010101010101"
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"0101010101010101" // Two FF bytes (usually). Unknown.
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"0110010101010101"; // CRC8 with (poly 7, initialization 0).
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static bool decode(uint8_t *bits, uint32_t numbytes, uint32_t numbits, ProtoViewMsgInfo *info) {
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if (USE_TEST_VECTOR) { /* Test vector to check that decoding works. */
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bitmap_set_pattern(bits,numbytes,0,test_vector);
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numbits = strlen(test_vector);
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}
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if (numbits-12 < 9*8) return false;
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const char *sync_pattern = "01010101010101010110";
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uint64_t off = bitmap_seek_bits(bits,numbytes,0,numbits,sync_pattern);
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if (off == BITMAP_SEEK_NOT_FOUND) return false;
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FURI_LOG_E(TAG, "Renault TPMS preamble+sync found");
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info->start_off = off;
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off += 20; /* Skip preamble. */
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uint8_t raw[9];
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uint32_t decoded =
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convert_from_line_code(raw,sizeof(raw),bits,numbytes,off,
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"01","10"); /* Manchester. */
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FURI_LOG_E(TAG, "Renault TPMS decoded bits: %lu", decoded);
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if (decoded < 8*9) return false; /* Require the full 9 bytes. */
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if (crc8(raw,8,0,7) != raw[8]) return false; /* Require sane CRC. */
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info->pulses_count = (off+8*9*2) - info->start_off;
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float kpa = 0.75 *((uint32_t)((raw[0]&3)<<8) | raw[1]);
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int temp = raw[2]-30;
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snprintf(info->name,sizeof(info->name),"%s","Renault TPMS");
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snprintf(info->raw,sizeof(info->raw),"%02X%02X%02X%02X%02X%02X%02X%02X%02X",
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raw[0],raw[1],raw[2],raw[3],raw[4],raw[5],
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raw[6],raw[7],raw[8]);
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snprintf(info->info1,sizeof(info->info1),"Tire ID %02X%02X%02X",
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raw[3],raw[4],raw[5]);
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snprintf(info->info2,sizeof(info->info2),"Pressure %.2f kpa", (double)kpa);
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snprintf(info->info3,sizeof(info->info3),"Temperature %d C", temp);
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return true;
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}
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ProtoViewDecoder RenaultTPMSDecoder = {
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"Renault TPMS", decode
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};
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