mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-12-19 01:03:22 +00:00
51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
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/* PT/SC remotes. Usually 443.92 Mhz OOK.
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*
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* This line code is used in many remotes such as Princeton chips
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* named PT2262, Silian Microelectronics SC5262 and others.
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* Basically every 4 pulsee represent a bit, where 1000 means 0, and
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* 1110 means 1. Usually we can read 24 bits of data.
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* In this specific implementation we check for a prelude that is
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* 1 bit high, 31 bits low, but the check is relaxed. */
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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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if (numbits < 30) return false;
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const char *sync_patterns[3] = {
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"10000000000000000000000000000001", /* 30 zero bits. */
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"100000000000000000000000000000001", /* 31 zero bits. */
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"1000000000000000000000000000000001", /* 32 zero bits. */
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};
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uint32_t off;
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int j;
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for (j = 0; j < 3; j++) {
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off = bitmap_seek_bits(bits,numbytes,0,numbits,sync_patterns[j]);
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if (off != BITMAP_SEEK_NOT_FOUND) break;
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}
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if (off == BITMAP_SEEK_NOT_FOUND) return false;
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if (DEBUG_MSG) FURI_LOG_E(TAG, "B4B1 preamble at: %lu",off);
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info->start_off = off;
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// Seek data setction. Why -1? Last bit is data.
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off += strlen(sync_patterns[j])-1;
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uint8_t d[3]; /* 24 bits of data. */
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uint32_t decoded =
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convert_from_line_code(d,sizeof(d),bits,numbytes,off,"1000","1110");
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if (DEBUG_MSG) FURI_LOG_E(TAG, "B4B1 decoded: %lu",decoded);
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if (decoded < 24) return false;
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off += 24*4; // seek to end symbol offset to calculate the length.
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off++; // In this protocol there is a final pulse as terminator.
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info->pulses_count = off - info->start_off;
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snprintf(info->name,PROTOVIEW_MSG_STR_LEN,"PT/SC remote");
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snprintf(info->raw,PROTOVIEW_MSG_STR_LEN,"%02X%02X%02X",d[0],d[1],d[2]);
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return true;
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}
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ProtoViewDecoder B4B1Decoder = {
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"B4B1", decode
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};
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