mirror of
https://github.com/DarkFlippers/unleashed-firmware
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98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/* Microchip HCS200/HCS300/HSC301 KeeLoq, rolling code remotes.
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*
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* Usually 443.92 Mhz OOK, ~200us or ~400us pulse len, depending
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* on the configuration.
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*
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* Preamble: 12 pairs of alternating pulse/gap.
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* Sync: long gap of around 10 times the duration of the short-pulse.
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* Data: pulse width encoded data. Each bit takes three cycles:
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*
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* 0 = 110
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* 1 = 100
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*
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* There are a total of 66 bits transmitted.
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* 0..31: 32 bits of encrypted rolling code.
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* 32..59: Remote ID, 28 bits
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* 60..63: Buttons pressed
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* 64..64: Low battery if set
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* 65..65: Always set to 1
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*
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* Bits in bytes are inverted: least significant bit is first.
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* For some reason there is no checksum whatsoever, so we only decode
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* if we find everything well formed.
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*/
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#include "../app.h"
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static bool decode(uint8_t* bits, uint32_t numbytes, uint32_t numbits, ProtoViewMsgInfo* info) {
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/* In the sync pattern, we require the 12 high/low pulses and at least
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* half the gap we expect (5 pulses times, one is the final zero in the
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* 24 symbols high/low sequence, then other 4). */
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const char* sync_pattern = "101010101010101010101010"
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"0000";
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uint8_t sync_len = 24 + 4;
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if(numbits - sync_len + sync_len < 3 * 66) return false;
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uint32_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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info->start_off = off;
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off += sync_len; // Seek start of message.
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/* Now there is half the gap left, but we allow from 3 to 7, instead of 5
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* symbols of gap, to avoid missing the signal for a matter of wrong
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* timing. */
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uint8_t gap_len = 0;
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while(gap_len <= 7 && bitmap_get(bits, numbytes, off + gap_len) == 0) gap_len++;
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if(gap_len < 3 || gap_len > 7) return false;
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off += gap_len;
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FURI_LOG_E(TAG, "Keeloq preamble+sync found");
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uint8_t raw[9] = {0};
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uint32_t decoded = convert_from_line_code(
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raw, sizeof(raw), bits, numbytes, off, "110", "100"); /* Pulse width modulation. */
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FURI_LOG_E(TAG, "Keeloq decoded bits: %lu", decoded);
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if(decoded < 66) return false; /* Require the full 66 bits. */
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info->pulses_count = (off + 66 * 3) - info->start_off;
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bitmap_reverse_bytes(raw, sizeof(raw)); /* Keeloq is LSB first. */
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int buttons = raw[7] >> 4;
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int s3 = (buttons & 1) != 0;
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int s0 = (buttons & 2) != 0;
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int s1 = (buttons & 4) != 0;
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int s2 = (buttons & 8) != 0;
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int remote_id = ((raw[7] & 0x0f) << 24) | (raw[6] << 16) | (raw[5] << 8) | (raw[4] << 0);
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int lowbat = raw[8] & 0x80;
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snprintf(info->name, sizeof(info->name), "%s", "Keeloq remote");
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snprintf(
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info->raw,
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sizeof(info->raw),
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"%02X%02X%02X%02X%02X%02X%02X%02X%02X",
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raw[0],
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raw[1],
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raw[2],
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raw[3],
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raw[4],
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raw[5],
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raw[6],
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raw[7],
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raw[8]);
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snprintf(
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info->info1,
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sizeof(info->info1),
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"Encrpyted %02X%02X%02X%02X",
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raw[3],
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raw[2],
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raw[1],
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raw[0]);
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snprintf(info->info2, sizeof(info->info2), "ID %08X", remote_id);
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snprintf(info->info3, sizeof(info->info3), "s0-s3: %d%d%d%d", s0, s1, s2, s3);
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snprintf(info->info4, sizeof(info->info4), "Low battery? %s", lowbat ? "yes" : "no");
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return true;
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}
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ProtoViewDecoder KeeloqDecoder = {"Keeloq", decode};
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