mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-12-18 08:43:10 +00:00
300 lines
No EOL
9.1 KiB
C
300 lines
No EOL
9.1 KiB
C
#include <furi.h>
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#include <toolbox/protocols/protocol.h>
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#include <toolbox/manchester_decoder.h>
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#include "lfrfid_protocols.h"
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typedef uint64_t EM4100DecodedData;
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#define EM_HEADER_POS (55)
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#define EM_HEADER_MASK (0x1FFLLU << EM_HEADER_POS)
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#define EM_FIRST_ROW_POS (50)
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#define EM_ROW_COUNT (10)
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#define EM_COLUMN_COUNT (4)
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#define EM_BITS_PER_ROW_COUNT (EM_COLUMN_COUNT + 1)
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#define EM_COLUMN_POS (4)
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#define EM_STOP_POS (0)
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#define EM_STOP_MASK (0x1LLU << EM_STOP_POS)
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#define EM_HEADER_AND_STOP_MASK (EM_HEADER_MASK | EM_STOP_MASK)
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#define EM_HEADER_AND_STOP_DATA (EM_HEADER_MASK)
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#define EM4100_DECODED_DATA_SIZE (5)
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#define EM4100_ENCODED_DATA_SIZE (sizeof(EM4100DecodedData))
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#define EM4100_CLOCK_PER_BIT (64)
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#define EM_READ_SHORT_TIME (256)
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#define EM_READ_LONG_TIME (512)
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#define EM_READ_JITTER_TIME (100)
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#define EM_READ_SHORT_TIME_LOW (EM_READ_SHORT_TIME - EM_READ_JITTER_TIME)
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#define EM_READ_SHORT_TIME_HIGH (EM_READ_SHORT_TIME + EM_READ_JITTER_TIME)
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#define EM_READ_LONG_TIME_LOW (EM_READ_LONG_TIME - EM_READ_JITTER_TIME)
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#define EM_READ_LONG_TIME_HIGH (EM_READ_LONG_TIME + EM_READ_JITTER_TIME)
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typedef struct {
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uint8_t data[EM4100_DECODED_DATA_SIZE];
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EM4100DecodedData encoded_data;
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uint8_t encoded_data_index;
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bool encoded_polarity;
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ManchesterState decoder_manchester_state;
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} ProtocolEM4100;
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ProtocolEM4100* protocol_em4100_alloc(void) {
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ProtocolEM4100* proto = malloc(sizeof(ProtocolEM4100));
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return (void*)proto;
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};
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void protocol_em4100_free(ProtocolEM4100* proto) {
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free(proto);
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};
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uint8_t* protocol_em4100_get_data(ProtocolEM4100* proto) {
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return proto->data;
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};
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static void em4100_decode(
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const uint8_t* encoded_data,
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const uint8_t encoded_data_size,
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uint8_t* decoded_data,
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const uint8_t decoded_data_size) {
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furi_check(decoded_data_size >= EM4100_DECODED_DATA_SIZE);
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furi_check(encoded_data_size >= EM4100_ENCODED_DATA_SIZE);
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uint8_t decoded_data_index = 0;
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EM4100DecodedData card_data = *((EM4100DecodedData*)(encoded_data));
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// clean result
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memset(decoded_data, 0, decoded_data_size);
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// header
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for(uint8_t i = 0; i < 9; i++) {
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card_data = card_data << 1;
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}
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// nibbles
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uint8_t value = 0;
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for(uint8_t r = 0; r < EM_ROW_COUNT; r++) {
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uint8_t nibble = 0;
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for(uint8_t i = 0; i < 5; i++) {
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if(i < 4) nibble = (nibble << 1) | (card_data & (1LLU << 63) ? 1 : 0);
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card_data = card_data << 1;
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}
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value = (value << 4) | nibble;
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if(r % 2) {
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decoded_data[decoded_data_index] |= value;
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decoded_data_index++;
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value = 0;
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}
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}
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}
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static bool em4100_can_be_decoded(const uint8_t* encoded_data, const uint8_t encoded_data_size) {
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furi_check(encoded_data_size >= EM4100_ENCODED_DATA_SIZE);
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const EM4100DecodedData* card_data = (EM4100DecodedData*)encoded_data;
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// check header and stop bit
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if((*card_data & EM_HEADER_AND_STOP_MASK) != EM_HEADER_AND_STOP_DATA) return false;
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// check row parity
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for(uint8_t i = 0; i < EM_ROW_COUNT; i++) {
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uint8_t parity_sum = 0;
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for(uint8_t j = 0; j < EM_BITS_PER_ROW_COUNT; j++) {
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parity_sum += (*card_data >> (EM_FIRST_ROW_POS - i * EM_BITS_PER_ROW_COUNT + j)) & 1;
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}
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if((parity_sum % 2)) {
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return false;
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}
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}
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// check columns parity
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for(uint8_t i = 0; i < EM_COLUMN_COUNT; i++) {
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uint8_t parity_sum = 0;
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for(uint8_t j = 0; j < EM_ROW_COUNT + 1; j++) {
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parity_sum += (*card_data >> (EM_COLUMN_POS - i + j * EM_BITS_PER_ROW_COUNT)) & 1;
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}
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if((parity_sum % 2)) {
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return false;
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}
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}
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return true;
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}
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void protocol_em4100_decoder_start(ProtocolEM4100* proto) {
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memset(proto->data, 0, EM4100_DECODED_DATA_SIZE);
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proto->encoded_data = 0;
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manchester_advance(
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proto->decoder_manchester_state,
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ManchesterEventReset,
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&proto->decoder_manchester_state,
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NULL);
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};
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bool protocol_em4100_decoder_feed(ProtocolEM4100* proto, bool level, uint32_t duration) {
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bool result = false;
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ManchesterEvent event = ManchesterEventReset;
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if(duration > EM_READ_SHORT_TIME_LOW && duration < EM_READ_SHORT_TIME_HIGH) {
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if(!level) {
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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(duration > EM_READ_LONG_TIME_LOW && duration < EM_READ_LONG_TIME_HIGH) {
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if(!level) {
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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 = manchester_advance(
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proto->decoder_manchester_state, event, &proto->decoder_manchester_state, &data);
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if(data_ok) {
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proto->encoded_data = (proto->encoded_data << 1) | data;
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if(em4100_can_be_decoded((uint8_t*)&proto->encoded_data, sizeof(EM4100DecodedData))) {
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em4100_decode(
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(uint8_t*)&proto->encoded_data,
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sizeof(EM4100DecodedData),
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proto->data,
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EM4100_DECODED_DATA_SIZE);
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result = true;
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}
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}
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}
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return result;
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};
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static void em4100_write_nibble(bool low_nibble, uint8_t data, EM4100DecodedData* encoded_data) {
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uint8_t parity_sum = 0;
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uint8_t start = 0;
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if(!low_nibble) start = 4;
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for(int8_t i = (start + 3); i >= start; i--) {
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parity_sum += (data >> i) & 1;
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*encoded_data = (*encoded_data << 1) | ((data >> i) & 1);
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}
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*encoded_data = (*encoded_data << 1) | ((parity_sum % 2) & 1);
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}
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bool protocol_em4100_encoder_start(ProtocolEM4100* proto) {
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// header
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proto->encoded_data = 0b111111111;
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// data
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for(uint8_t i = 0; i < EM4100_DECODED_DATA_SIZE; i++) {
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em4100_write_nibble(false, proto->data[i], &proto->encoded_data);
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em4100_write_nibble(true, proto->data[i], &proto->encoded_data);
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}
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// column parity and stop bit
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uint8_t parity_sum;
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for(uint8_t c = 0; c < EM_COLUMN_COUNT; c++) {
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parity_sum = 0;
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for(uint8_t i = 1; i <= EM_ROW_COUNT; i++) {
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uint8_t parity_bit = (proto->encoded_data >> (i * EM_BITS_PER_ROW_COUNT - 1)) & 1;
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parity_sum += parity_bit;
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}
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proto->encoded_data = (proto->encoded_data << 1) | ((parity_sum % 2) & 1);
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}
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// stop bit
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proto->encoded_data = (proto->encoded_data << 1) | 0;
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proto->encoded_data_index = 0;
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proto->encoded_polarity = true;
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return true;
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};
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LevelDuration protocol_em4100_encoder_yield(ProtocolEM4100* proto) {
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bool level = (proto->encoded_data >> (63 - proto->encoded_data_index)) & 1;
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uint32_t duration = EM4100_CLOCK_PER_BIT / 2;
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if(proto->encoded_polarity) {
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proto->encoded_polarity = false;
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} else {
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level = !level;
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proto->encoded_polarity = true;
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proto->encoded_data_index++;
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if(proto->encoded_data_index >= 64) {
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proto->encoded_data_index = 0;
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}
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}
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return level_duration_make(level, duration);
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};
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bool protocol_em4100_write_data(ProtocolEM4100* protocol, void* data) {
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LFRFIDWriteRequest* request = (LFRFIDWriteRequest*)data;
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bool result = false;
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// Correct protocol data by redecoding
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protocol_em4100_encoder_start(protocol);
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em4100_decode(
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(uint8_t*)&protocol->encoded_data,
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sizeof(EM4100DecodedData),
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protocol->data,
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EM4100_DECODED_DATA_SIZE);
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protocol_em4100_encoder_start(protocol);
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if(request->write_type == LFRFIDWriteTypeT5577) {
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request->t5577.block[0] =
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(LFRFID_T5577_MODULATION_MANCHESTER | LFRFID_T5577_BITRATE_RF_64 |
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(2 << LFRFID_T5577_MAXBLOCK_SHIFT));
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request->t5577.block[1] = protocol->encoded_data;
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request->t5577.block[2] = protocol->encoded_data >> 32;
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request->t5577.blocks_to_write = 3;
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result = true;
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}
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return result;
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};
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void protocol_em4100_render_data(ProtocolEM4100* protocol, string_t result) {
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uint8_t* data = protocol->data;
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string_printf(result, "FC: %03u, Card: %05u", data[2], (uint16_t)((data[3] << 8) | (data[4])));
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};
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const ProtocolBase protocol_em4100 = {
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.name = "EM4100",
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.manufacturer = "EM-Micro",
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.data_size = EM4100_DECODED_DATA_SIZE,
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.features = LFRFIDFeatureASK | LFRFIDFeaturePSK,
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.validate_count = 3,
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.alloc = (ProtocolAlloc)protocol_em4100_alloc,
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.free = (ProtocolFree)protocol_em4100_free,
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.get_data = (ProtocolGetData)protocol_em4100_get_data,
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.decoder =
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{
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.start = (ProtocolDecoderStart)protocol_em4100_decoder_start,
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.feed = (ProtocolDecoderFeed)protocol_em4100_decoder_feed,
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},
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.encoder =
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{
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.start = (ProtocolEncoderStart)protocol_em4100_encoder_start,
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.yield = (ProtocolEncoderYield)protocol_em4100_encoder_yield,
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},
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.render_data = (ProtocolRenderData)protocol_em4100_render_data,
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.render_brief_data = (ProtocolRenderData)protocol_em4100_render_data,
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.write_data = (ProtocolWriteData)protocol_em4100_write_data,
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}; |