flipperzero-firmware/applications/lfrfid/helpers/decoder-emmarin.cpp
2021-08-11 02:09:51 +03:00

73 lines
2.0 KiB
C++

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