618ddfcd04
* Api-hal-gpio: extend init functions * App Lfrfid: separate protocol layer * App Lfrfid: write EM key scene * App Lfrfid: syntax fix
99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
#include "decoder-hid26.h"
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#include <api-hal.h>
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constexpr uint32_t clocks_in_us = 64;
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constexpr uint32_t jitter_time_us = 20;
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constexpr uint32_t min_time_us = 64;
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constexpr uint32_t max_time_us = 80;
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constexpr uint32_t min_time = (min_time_us - jitter_time_us) * clocks_in_us;
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constexpr uint32_t mid_time = ((max_time_us - min_time_us) / 2 + min_time_us) * clocks_in_us;
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constexpr uint32_t max_time = (max_time_us + jitter_time_us) * clocks_in_us;
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bool DecoderHID26::read(uint8_t* data, uint8_t data_size) {
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bool result = false;
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furi_assert(data_size >= 3);
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if(ready) {
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result = true;
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hid.decode(
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reinterpret_cast<const uint8_t*>(&stored_data), sizeof(uint32_t) * 3, 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 DecoderHID26::process_front(bool polarity, uint32_t time) {
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if(ready) return;
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if(polarity == true) {
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last_pulse_time = time;
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} else {
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last_pulse_time += time;
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if(last_pulse_time > min_time && last_pulse_time < max_time) {
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bool pulse;
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if(last_pulse_time < mid_time) {
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// 6 pulses
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pulse = false;
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} else {
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// 5 pulses
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pulse = true;
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}
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if(last_pulse == pulse) {
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pulse_count++;
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if(pulse) {
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if(pulse_count > 4) {
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pulse_count = 0;
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store_data(1);
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}
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} else {
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if(pulse_count > 5) {
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pulse_count = 0;
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store_data(0);
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}
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}
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} else {
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if(last_pulse) {
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if(pulse_count > 2) {
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store_data(1);
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}
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} else {
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if(pulse_count > 3) {
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store_data(0);
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}
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}
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pulse_count = 0;
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last_pulse = pulse;
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}
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}
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}
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}
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DecoderHID26::DecoderHID26() {
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reset_state();
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}
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void DecoderHID26::store_data(bool data) {
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stored_data[0] = (stored_data[0] << 1) | ((stored_data[1] >> 31) & 1);
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stored_data[1] = (stored_data[1] << 1) | ((stored_data[2] >> 31) & 1);
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stored_data[2] = (stored_data[2] << 1) | data;
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if(hid.can_be_decoded(reinterpret_cast<const uint8_t*>(&stored_data), sizeof(uint32_t) * 3)) {
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ready = true;
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}
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}
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void DecoderHID26::reset_state() {
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last_pulse = false;
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pulse_count = 0;
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ready = false;
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last_pulse_time = 0;
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}
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