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89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/* 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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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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{
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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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};
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