73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
#include "emmarin.h"
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#include "decoder-emmarin.h"
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#include <furi.h>
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#include <furi-hal.h>
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constexpr uint32_t clocks_in_us = 64;
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constexpr uint32_t short_time = 255 * clocks_in_us;
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constexpr uint32_t long_time = 510 * clocks_in_us;
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constexpr uint32_t jitter_time = 100 * clocks_in_us;
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constexpr uint32_t short_time_low = short_time - jitter_time;
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constexpr uint32_t short_time_high = short_time + jitter_time;
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constexpr uint32_t long_time_low = long_time - jitter_time;
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constexpr uint32_t long_time_high = long_time + jitter_time;
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void DecoderEMMarin::reset_state() {
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ready = false;
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readed_data = 0;
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manchester_advance(
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manchester_saved_state, ManchesterEventReset, &manchester_saved_state, nullptr);
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}
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bool DecoderEMMarin::read(uint8_t* data, uint8_t data_size) {
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bool result = false;
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if(ready) {
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result = true;
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em_marin.decode(
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reinterpret_cast<const uint8_t*>(&readed_data), sizeof(uint64_t), data, data_size);
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ready = false;
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}
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return result;
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}
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void DecoderEMMarin::process_front(bool polarity, uint32_t time) {
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if(ready) return;
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if(time < short_time_low) return;
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ManchesterEvent event = ManchesterEventReset;
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if(time > short_time_low && time < short_time_high) {
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if(polarity) {
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event = ManchesterEventShortHigh;
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} else {
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event = ManchesterEventShortLow;
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}
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} else if(time > long_time_low && time < long_time_high) {
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if(polarity) {
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event = ManchesterEventLongHigh;
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} else {
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event = ManchesterEventLongLow;
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}
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}
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if(event != ManchesterEventReset) {
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bool data;
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bool data_ok =
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manchester_advance(manchester_saved_state, event, &manchester_saved_state, &data);
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if(data_ok) {
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readed_data = (readed_data << 1) | data;
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ready = em_marin.can_be_decoded(
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reinterpret_cast<const uint8_t*>(&readed_data), sizeof(uint64_t));
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}
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}
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}
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DecoderEMMarin::DecoderEMMarin() {
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reset_state();
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}
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