flipperzero-firmware/applications/lfrfid/helpers/manchester-decoder.c

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Low frequency RFID app [Read stage] (#385) * App Lfrfid: init * HAL-resources: add external gpios * HAL-pwm: fix frequency calculation * App LFRFID: generic manchester decoder * App LFRFID: em-marine decoder * App iButton: fix dwt timing acquire * App LFRFID: rfid reader * App LFRFID: temporary read keys on read scene * App LFRFID: remove atomic bool init. * App LFRFID: add *.c to build * App LFRFID: unstable HID decoder * App LFRFID: HID-26 reading * HAL OS: disable sleep * App LFRFID: HID-26 reader: remove debug * App LFRFID: static data decoder-analyzer * App LFRFID: very raw Indala decoder * App LFRFID: multiprotocol reader * App LFRFID: more reliable HID decoder * App LFRFID: syntax fix * App LFRFID: simple read scene * Gui: force redraw on screen stream connect * HAL-OS: allow sleep * App LFRFID: notify api, tune view, tune scene * App LFRFID: simple rfid emulator * App LFRFID: more scenes, more reliable EM decoder. * App LFRFID: format fix * App LFRFID: warning fix * Api-hal-resources: add rfid pins, rename external pins * App LFRFID: remove unused emulator * App LFRFID: use new gpio hal api * App accessor: use new ext gpio name * App LFRFID: remove unused emulator * App LFRFID: remove debug gpio * Api-hal-resources: alternate functions init * Api-hal-rfid: new api * Api-hal-ibutton: new api * Api-hal: new headers * App LFRFID: use new api in reader subroutines * App LFRFID: use new api in emulator subroutines * App LFRFID: remove old app * App LFRFID, App iButton: fix memleak * Api-hal-rfid: comments * App LFRFID: pulse joiner helper, it combines pulses of different polarity into one pulse suitable for a timer * App LFRFID: pulse joiner, now can accept only ne pulse * App LFRFID: pulse joiner, fixes * App LFRFID: EM encoder and emulation * App LFRFID: format fixes * App LFRFID: emmarine encoder cleanup * App LFRFID: HID Encoder blank * App LFRFID: Indala Encoder blank
2021-05-04 13:21:16 +00:00
#include "manchester-decoder.h"
#include <stdint.h>
static const uint8_t transitions[] = {0b00000001, 0b10010001, 0b10011011, 0b11111011};
static const ManchesterState manchester_reset_state = ManchesterStateMid1;
bool manchester_advance(
ManchesterState state,
ManchesterEvent event,
ManchesterState* next_state,
bool* data) {
bool result = false;
ManchesterState new_state;
if(event == ManchesterEventReset) {
new_state = manchester_reset_state;
} else {
new_state = transitions[state] >> event & 0x3;
if(new_state == state) {
new_state = manchester_reset_state;
} else {
if(new_state == ManchesterStateMid0) {
*data = false;
result = true;
} else if(new_state == ManchesterStateMid1) {
*data = true;
result = true;
}
}
}
*next_state = new_state;
return result;
}