232 lines
8.3 KiB
C
232 lines
8.3 KiB
C
#include <furi.h>
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#include <math.h>
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#include <toolbox/protocols/protocol.h>
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#include <toolbox/hex.h>
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#include <lfrfid/tools/bit_lib.h>
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#include "lfrfid_protocols.h"
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#define PAC_STANLEY_ENCODED_BIT_SIZE (128)
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#define PAC_STANLEY_ENCODED_BYTE_SIZE (((PAC_STANLEY_ENCODED_BIT_SIZE) / 8))
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#define PAC_STANLEY_PREAMBLE_BIT_SIZE (8)
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#define PAC_STANLEY_PREAMBLE_BYTE_SIZE (1)
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#define PAC_STANLEY_ENCODED_BYTE_FULL_SIZE \
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(PAC_STANLEY_ENCODED_BYTE_SIZE + PAC_STANLEY_PREAMBLE_BYTE_SIZE)
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#define PAC_STANLEY_BYTE_LENGTH (10) // start bit, 7 data bits, parity bit, stop bit
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#define PAC_STANLEY_DATA_START_INDEX (8 + (3 * PAC_STANLEY_BYTE_LENGTH) + 1)
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#define PAC_STANLEY_DECODED_DATA_SIZE (4)
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#define PAC_STANLEY_ENCODED_DATA_SIZE (sizeof(ProtocolPACStanley))
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#define PAC_STANLEY_CLOCKS_IN_US (32)
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#define PAC_STANLEY_CYCLE_LENGTH (256)
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#define PAC_STANLEY_MIN_TIME (60)
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#define PAC_STANLEY_MAX_TIME (4000)
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typedef struct {
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bool inverted;
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bool got_preamble;
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size_t encoded_index;
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uint8_t encoded_data[PAC_STANLEY_ENCODED_BYTE_FULL_SIZE];
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uint8_t data[PAC_STANLEY_DECODED_DATA_SIZE];
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} ProtocolPACStanley;
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ProtocolPACStanley* protocol_pac_stanley_alloc(void) {
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ProtocolPACStanley* protocol = malloc(sizeof(ProtocolPACStanley));
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return (void*)protocol;
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}
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void protocol_pac_stanley_free(ProtocolPACStanley* protocol) {
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free(protocol);
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}
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uint8_t* protocol_pac_stanley_get_data(ProtocolPACStanley* protocol) {
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return protocol->data;
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}
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static void protocol_pac_stanley_decode(ProtocolPACStanley* protocol) {
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uint8_t asciiCardId[8];
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for(size_t idx = 0; idx < 8; idx++) {
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uint8_t byte = bit_lib_reverse_8_fast(bit_lib_get_bits(
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protocol->encoded_data,
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PAC_STANLEY_DATA_START_INDEX + (PAC_STANLEY_BYTE_LENGTH * idx),
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8));
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asciiCardId[idx] = byte & 0x7F; // discard the parity bit
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}
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hex_chars_to_uint8((char*)asciiCardId, protocol->data);
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}
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static bool protocol_pac_stanley_can_be_decoded(ProtocolPACStanley* protocol) {
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// Check preamble
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if(bit_lib_get_bits(protocol->encoded_data, 0, 8) != 0b11111111) return false;
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if(bit_lib_get_bit(protocol->encoded_data, 8) != 0) return false;
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if(bit_lib_get_bit(protocol->encoded_data, 9) != 0) return false;
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if(bit_lib_get_bit(protocol->encoded_data, 10) != 1) return false;
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if(bit_lib_get_bits(protocol->encoded_data, 11, 8) != 0b00000010) return false;
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// Check next preamble
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if(bit_lib_get_bits(protocol->encoded_data, 128, 8) != 0b11111111) return false;
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// Checksum
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uint8_t checksum = 0;
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uint8_t stripped_byte;
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for(size_t idx = 0; idx < 9; idx++) {
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uint8_t byte = bit_lib_reverse_8_fast(bit_lib_get_bits(
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protocol->encoded_data,
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PAC_STANLEY_DATA_START_INDEX + (PAC_STANLEY_BYTE_LENGTH * idx),
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8));
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stripped_byte = byte & 0x7F; // discard the parity bit
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if(bit_lib_test_parity_32(stripped_byte, BitLibParityOdd) != (byte & 0x80) >> 7) {
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return false;
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}
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if(idx < 8) checksum ^= stripped_byte;
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}
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if(stripped_byte != checksum) return false;
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return true;
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}
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void protocol_pac_stanley_decoder_start(ProtocolPACStanley* protocol) {
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memset(protocol->data, 0, PAC_STANLEY_DECODED_DATA_SIZE);
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protocol->inverted = false;
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protocol->got_preamble = false;
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}
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bool protocol_pac_stanley_decoder_feed(ProtocolPACStanley* protocol, bool level, uint32_t duration) {
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bool pushed = false;
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if(duration > PAC_STANLEY_MAX_TIME) return false;
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uint8_t pulses = (uint8_t)round((float)duration / PAC_STANLEY_CYCLE_LENGTH);
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// Handle last stopbit & preamble (1 sb, 8 bit preamble)
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if(pulses >= 9 && !protocol->got_preamble) {
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pulses = 8;
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protocol->got_preamble = true;
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protocol->inverted = !level;
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} else if(pulses >= 9 && protocol->got_preamble) {
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protocol->got_preamble = false;
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} else if(pulses == 0 && duration > PAC_STANLEY_MIN_TIME) {
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pulses = 1;
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}
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if(pulses) {
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for(uint8_t i = 0; i < pulses; i++) {
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bit_lib_push_bit(
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protocol->encoded_data,
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PAC_STANLEY_ENCODED_BYTE_FULL_SIZE,
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level ^ protocol->inverted);
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}
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pushed = true;
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}
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if(pushed && protocol_pac_stanley_can_be_decoded(protocol)) {
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protocol_pac_stanley_decode(protocol);
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return true;
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}
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return false;
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}
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bool protocol_pac_stanley_encoder_start(ProtocolPACStanley* protocol) {
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memset(protocol->encoded_data, 0, sizeof(protocol->encoded_data));
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uint8_t idbytes[10];
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idbytes[0] = '2';
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idbytes[1] = '0';
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uint8_to_hex_chars(protocol->data, &idbytes[2], 8);
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// insert start and stop bits
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for(size_t i = 0; i < 16; i++) protocol->encoded_data[i] = 0x40 >> ((i + 3) % 5 * 2);
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protocol->encoded_data[0] = 0xFF; // mark + stop
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protocol->encoded_data[1] = 0x20; // start + reflect8(STX)
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uint8_t checksum = 0;
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for(size_t i = 2; i < 13; i++) {
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uint8_t shift = 7 - (i + 3) % 4 * 2;
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uint8_t index = i + (i - 1) / 4;
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uint16_t pattern;
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if(i < 12) {
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pattern = bit_lib_reverse_8_fast(idbytes[i - 2]);
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pattern |= bit_lib_test_parity_32(pattern, BitLibParityOdd);
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if(i > 3) checksum ^= idbytes[i - 2];
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} else {
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pattern = (bit_lib_reverse_8_fast(checksum) & 0xFE) |
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(bit_lib_test_parity_32(checksum, BitLibParityOdd));
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}
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pattern <<= shift;
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protocol->encoded_data[index] |= pattern >> 8 & 0xFF;
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protocol->encoded_data[index + 1] |= pattern & 0xFF;
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}
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protocol->encoded_index = 0;
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return true;
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}
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LevelDuration protocol_pac_stanley_encoder_yield(ProtocolPACStanley* protocol) {
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uint16_t length = PAC_STANLEY_CLOCKS_IN_US;
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bool bit = bit_lib_get_bit(protocol->encoded_data, protocol->encoded_index);
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bit_lib_increment_index(protocol->encoded_index, PAC_STANLEY_ENCODED_BIT_SIZE);
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while(bit_lib_get_bit(protocol->encoded_data, protocol->encoded_index) == bit) {
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length += PAC_STANLEY_CLOCKS_IN_US;
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bit_lib_increment_index(protocol->encoded_index, PAC_STANLEY_ENCODED_BIT_SIZE);
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}
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return level_duration_make(bit, length);
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}
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bool protocol_pac_stanley_write_data(ProtocolPACStanley* 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_pac_stanley_encoder_start(protocol);
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protocol_pac_stanley_decode(protocol);
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protocol_pac_stanley_encoder_start(protocol);
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if(request->write_type == LFRFIDWriteTypeT5577) {
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request->t5577.block[0] = LFRFID_T5577_MODULATION_DIRECT | LFRFID_T5577_BITRATE_RF_32 |
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(4 << LFRFID_T5577_MAXBLOCK_SHIFT);
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request->t5577.block[1] = bit_lib_get_bits_32(protocol->encoded_data, 0, 32);
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request->t5577.block[2] = bit_lib_get_bits_32(protocol->encoded_data, 32, 32);
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request->t5577.block[3] = bit_lib_get_bits_32(protocol->encoded_data, 64, 32);
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request->t5577.block[4] = bit_lib_get_bits_32(protocol->encoded_data, 96, 32);
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request->t5577.blocks_to_write = 5;
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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_pac_stanley_render_data(ProtocolPACStanley* protocol, FuriString* result) {
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uint8_t* data = protocol->data;
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furi_string_printf(result, "CIN: %02X%02X%02X%02X", data[0], data[1], data[2], data[3]);
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}
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const ProtocolBase protocol_pac_stanley = {
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.name = "PAC/Stanley",
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.manufacturer = "N/A",
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.data_size = PAC_STANLEY_DECODED_DATA_SIZE,
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.features = LFRFIDFeatureASK,
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.validate_count = 3,
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.alloc = (ProtocolAlloc)protocol_pac_stanley_alloc,
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.free = (ProtocolFree)protocol_pac_stanley_free,
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.get_data = (ProtocolGetData)protocol_pac_stanley_get_data,
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.decoder =
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{
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.start = (ProtocolDecoderStart)protocol_pac_stanley_decoder_start,
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.feed = (ProtocolDecoderFeed)protocol_pac_stanley_decoder_feed,
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},
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.encoder =
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{
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.start = (ProtocolEncoderStart)protocol_pac_stanley_encoder_start,
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.yield = (ProtocolEncoderYield)protocol_pac_stanley_encoder_yield,
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},
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.render_data = (ProtocolRenderData)protocol_pac_stanley_render_data,
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.render_brief_data = (ProtocolRenderData)protocol_pac_stanley_render_data,
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.write_data = (ProtocolWriteData)protocol_pac_stanley_write_data,
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};
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