mirror of
https://github.com/DarkFlippers/unleashed-firmware
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93 lines
3.5 KiB
C
93 lines
3.5 KiB
C
/* Copyright (C) 2022-2023 Salvatore Sanfilippo -- All Rights Reserved
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* See the LICENSE file for information about the license.
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*
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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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/* Test different pulse + gap + first byte possibilities. */
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const char* sync_patterns[6] = {
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"100000000000000000000000000000011101", /* 30 times gap + one. */
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"100000000000000000000000000000010001", /* 30 times gap + zero. */
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"1000000000000000000000000000000011101", /* 31 times gap + one. */
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"1000000000000000000000000000000010001", /* 31 times gap + zero. */
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"10000000000000000000000000000000011101", /* 32 times gap + one. */
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"10000000000000000000000000000000010001", /* 32 times gap + zero. */
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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 id:%d at: %lu", j, off);
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info->start_off = off;
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// Seek data setction. Why -5? Last 5 half-bit-times are data.
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off += strlen(sync_patterns[j]) - 5;
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uint8_t d[3]; /* 24 bits of data. */
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uint32_t decoded = 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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fieldset_add_bytes(info->fieldset, "id", d, 5);
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fieldset_add_uint(info->fieldset, "button", d[2] & 0xf, 4);
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return true;
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}
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/* Give fields and defaults for the signal creator. */
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static void get_fields(ProtoViewFieldSet* fieldset) {
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uint8_t default_id[3] = {0xAB, 0xCD, 0xE0};
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fieldset_add_bytes(fieldset, "id", default_id, 5);
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fieldset_add_uint(fieldset, "button", 1, 4);
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}
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/* Create a signal. */
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static void build_message(RawSamplesBuffer* samples, ProtoViewFieldSet* fs) {
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uint32_t te = 334; // Short pulse duration in microseconds.
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// Sync: 1 te pulse, 31 te gap.
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raw_samples_add(samples, true, te);
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raw_samples_add(samples, false, te * 31);
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// ID + button state
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uint8_t data[3];
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memcpy(data, fs->fields[0]->bytes, 3);
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data[2] = (data[2] & 0xF0) | (fs->fields[1]->uvalue & 0xF);
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for(uint32_t j = 0; j < 24; j++) {
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if(bitmap_get(data, sizeof(data), j)) {
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raw_samples_add(samples, true, te * 3);
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raw_samples_add(samples, false, te);
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} else {
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raw_samples_add(samples, true, te);
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raw_samples_add(samples, false, te * 3);
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}
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}
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// Signal terminator. Just a single short pulse.
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raw_samples_add(samples, true, te);
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}
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ProtoViewDecoder B4B1Decoder = {
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.name = "PT/SC remote",
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.decode = decode,
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.get_fields = get_fields,
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.build_message = build_message};
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