mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-12-19 01:03:22 +00:00
91 lines
3.2 KiB
C
91 lines
3.2 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" "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)
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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 =
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convert_from_line_code(raw,sizeof(raw),bits,numbytes,off,
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"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) |
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(raw[6] << 16) |
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(raw[5] << 8) |
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(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(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),"Encrpyted %02X%02X%02X%02X",
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raw[3],raw[2],raw[1],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",
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s0,s1,s2,s3);
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snprintf(info->info4,sizeof(info->info4),"Low battery? %s",
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lowbat ? "yes" : "no");
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return true;
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}
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ProtoViewDecoder KeeloqDecoder = {
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"Keeloq", decode
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};
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