flipperzero-firmware/applications/ibutton/helpers/metakom_decoder.cpp

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#include "metakom_decoder.h"
new iButton app (#328) * rename old ibutton app to ibutton-test * more renames * updated onewire library compilation condition * add submenu_clean subroutine * add index for submenu callback * c++ guard for gui modules * add released ibutton app * fix the position of the submenu window if there are too few items * iButton app basis * negative icon position info * fix submenu_clean subroutine * add ibutton app to applications makefile * add onewire key read routine to read mode * rename mode to scene * rename files and folder (mode to scene) * rename ibutton view to view manager * rename get_view to get_view_manager * cpp guards * key read, store and notify features * syntax fix * make iButtonScene functions pure virtual * fix syntax * add text store, add new scene (crc error) * not a key scene * syntax fix * read success scene * app, switching to the previous scene with the number of scenes to be skipped * scene whith menu when key is readed * fix font height calculation, fix offsets * add key write scene * view_dispatcher_remove_view subroutine * generic pause/resume os methods * fix furi_assert usage * key store, worker * fix pointer comparsion * saved keys, saved key action scenes * key delete/confirm delete scenes and routines * use last input subsystem changes * fix syntax * fix new model usage in submenu * fix includes * use vibro pin * use stored key name if valid * emulate scene * random name generator * name and save readed key scenes, new icon * fix icon position * fix text scene exit * fix naming, fix text placement, new info scene * state-driven cyfral decoder * better cyfral decoder * better cyfral decoder * one wire: search command set * metakom decoder * more key types * add next scene to error scenes * universal key reader * use new key reader * syntax fix * warning fix * byte input module template * new thread and insomnia api usage * New element: slightly rounded frame * Use elements_slightly_rounded_frame in text input * Gui test app: byte input usage * Byte input module: data drawing and selection * Byte input: comment currently unused fns * remove volatile qualifier * base byte input realisation * App gui test: remove internal fns visibility * Byne input, final version * test install gcc-arm-none-eabi-10-2020-q4-major * test install gcc-arm-none-eabi-10-2020-q4-major * App iButton: byte input view managment * App iButton: add key manually scenes * App iButton: rename scenes, add popup timeout * App iButton: use new scenes, new fn for rollback to specific prevous scene. * App iButton: remove byte input view on app exit * App iButton: edit key scene * Module byte input: reduce swintch value to uint8_t * Module byte input: switch from switch-case to if, unfortunately we need compile-time constants to use with switch * Icons: new small arrows * Module byte input: new arrangement of elements * OneWire slave lib: fix deattach sequence * App iButton: pulse sequencer * App iButton: add more keys to store * App iButton: split key worker to separate read/write/emulate entitys * App iButton: use new read/emulate entities * fix callback pointer saving * App iButton: use KeyReader error enum instead of KeyWorker error list handling * App iButton: do not use insomnia fns in pulse sequencer * App iButton: use KeyReader error enum in read scene * OneWire slave lib: more READ ROM command variants, call callback only if positive result * GPIO resources: add external gpio * App SD/NFC: removed application * App iButton-test: update to new light api * App iButton: update to new light-api * Outdated apps: add api-light-usage * Gpio: update SD card CS pin settings * API-power: added fns to disable/enable external 3v3 dc-dc * API-gpio: separated SD card detect routines * Resources: removed sd cs pin * SD card: low level init now resets card power supply * App SD-filesystem: use new card detect fns * SD card: fix low level init headers * SD card: more realilable low level init, power reset, exit from command read cycle conditionally * App SD-filesystem: led notifiers, init cycling * SD card: backport to F4 * Api PWM: add c++ guards * App iButton: yellow blink in emulate scene, vibro on * App iButton: one wire keys command set * App iButton: successful write scene * App iButton: key writer * App iButton: syntax fix * App iButton: notify write success * App iButton: fix double scene change * SD card: handle eject in init sequence * SD card: api to set level on detect gpio * SPI: api to set state on bus pins * SD card: set low state on bus pins while power reset * File select: init * File select: fix input consuming * SD Card: fixed dir open api error * SD-card: replace strncpy by strlcpy. Fix buffer overflow error. * API HAL OS: replace CMP based ticks with ARR based one, hard reset lptimer on reconfiguration. * GUI: More stack size for (temporary, wee need to implement sd card api in separate thread) * GUI: File select module. * App iButton-test: remove obsolete app Co-authored-by: rusdacent <rusdacentx0x08@gmail.com> Co-authored-by: coreglitch <mail@s3f.ru> Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
2021-03-12 12:45:18 +00:00
#include <furi.h>
bool MetakomDecoder::read(uint8_t* _data, uint8_t data_size) {
bool result = false;
if(ready) {
memcpy(_data, &key_data, 4);
reset_state();
result = true;
}
return result;
}
void MetakomDecoder::process_front(bool polarity, uint32_t time) {
if(max_period == 0) {
max_period = 230 * (SystemCoreClock / 1000000.0f);
}
if(ready) return;
uint32_t high_time = 0;
uint32_t low_time = 0;
switch(state) {
case State::WAIT_PERIOD_SYNC:
if(process_bit(polarity, time, &high_time, &low_time)) {
period_sample_data[period_sample_index] = high_time + low_time;
period_sample_index++;
if(period_sample_index == period_sample_count) {
for(uint8_t i = 0; i < period_sample_count; i++) {
period_time += period_sample_data[i];
};
period_time /= period_sample_count;
state = State::WAIT_START_BIT;
}
}
break;
case State::WAIT_START_BIT:
if(process_bit(polarity, time, &high_time, &low_time)) {
tmp_counter++;
if(high_time > period_time) {
tmp_counter = 0;
state = State::WAIT_START_WORD;
}
if(tmp_counter > 40) {
reset_state();
}
}
break;
case State::WAIT_START_WORD:
if(process_bit(polarity, time, &high_time, &low_time)) {
if(low_time < (period_time / 2)) {
tmp_data = (tmp_data << 1) | 0b0;
} else {
tmp_data = (tmp_data << 1) | 0b1;
}
tmp_counter++;
if(tmp_counter == 3) {
if(tmp_data == 0b010) {
tmp_counter = 0;
tmp_data = 0;
state = State::READ_WORD;
} else {
reset_state();
}
}
}
break;
case State::READ_WORD:
if(process_bit(polarity, time, &high_time, &low_time)) {
if(low_time < (period_time / 2)) {
tmp_data = (tmp_data << 1) | 0b0;
} else {
tmp_data = (tmp_data << 1) | 0b1;
}
tmp_counter++;
if(tmp_counter == 8) {
if(parity_check(tmp_data)) {
key_data = (key_data << 8) | tmp_data;
key_data_index++;
tmp_data = 0;
tmp_counter = 0;
if(key_data_index == 4) {
// check for stop bit
if(high_time > period_time) {
state = State::READ_STOP_WORD;
} else {
reset_state();
}
}
} else {
reset_state();
}
}
}
break;
case State::READ_STOP_WORD:
if(process_bit(polarity, time, &high_time, &low_time)) {
if(low_time < (period_time / 2)) {
tmp_data = (tmp_data << 1) | 0b0;
} else {
tmp_data = (tmp_data << 1) | 0b1;
}
tmp_counter++;
if(tmp_counter == 3) {
if(tmp_data == 0b010) {
ready = true;
} else {
reset_state();
}
}
}
break;
}
}
MetakomDecoder::MetakomDecoder() {
reset_state();
}
void MetakomDecoder::reset_state() {
ready = false;
period_sample_index = 0;
period_time = 0;
tmp_counter = 0;
tmp_data = 0;
for(uint8_t i = 0; i < period_sample_count; i++) {
period_sample_data[i] = 0;
};
state = State::WAIT_PERIOD_SYNC;
bit_state = BitState::WAIT_FRONT_LOW;
key_data = 0;
key_data_index = 0;
}
bool MetakomDecoder::parity_check(uint8_t data) {
uint8_t ones_count = 0;
bool result;
for(uint8_t i = 0; i < 8; i++) {
if((data >> i) & 0b00000001) {
ones_count++;
}
}
result = (ones_count % 2 == 0);
return result;
}
bool MetakomDecoder::process_bit(
bool polarity,
uint32_t time,
uint32_t* high_time,
uint32_t* low_time) {
bool result = false;
switch(bit_state) {
case BitState::WAIT_FRONT_LOW:
if(polarity == false) {
*low_time = low_time_storage;
*high_time = time;
result = true;
bit_state = BitState::WAIT_FRONT_HIGH;
}
break;
case BitState::WAIT_FRONT_HIGH:
if(polarity == true) {
low_time_storage = time;
bit_state = BitState::WAIT_FRONT_LOW;
}
break;
}
return result;
}