subghz: add ditec gol4 protocol

by @xMasterX (MMX) & @zero-mega

lib/subghz/protocols/ditec_gol4.c

@@ -0,0 +1,729 @@
+#include "ditec_gol4.h"
+#include "../blocks/const.h"
+#include "../blocks/decoder.h"
+#include "../blocks/encoder.h"
+#include "../blocks/generic.h"
+#include "../blocks/math.h"
+
+#include "../blocks/custom_btn_i.h"
+
+#define TAG "SubGhzProtocolDitecGOL4"
+
+#define GOL4_RAW_BYTES 7
+
+static const SubGhzBlockConst subghz_protocol_ditec_gol4_const = {
+    .te_short = 400,
+    .te_long = 1100,
+    .te_delta = 200,
+    .min_count_bit_for_found = 54,
+};
+
+struct SubGhzProtocolDecoderDitecGOL4 {
+    SubGhzProtocolDecoderBase base;
+
+    SubGhzBlockDecoder decoder;
+    SubGhzBlockGeneric generic;
+};
+
+struct SubGhzProtocolEncoderDitecGOL4 {
+    SubGhzProtocolEncoderBase base;
+
+    SubGhzProtocolBlockEncoder encoder;
+    SubGhzBlockGeneric generic;
+};
+
+typedef enum {
+    DitecGOL4DecoderStepReset = 0,
+    DitecGOL4DecoderStepStartBit,
+    DitecGOL4DecoderStepSaveDuration,
+    DitecGOL4DecoderStepCheckDuration,
+} DitecGOL4DecoderStep;
+
+const SubGhzProtocolDecoder subghz_protocol_ditec_gol4_decoder = {
+    .alloc = subghz_protocol_decoder_ditec_gol4_alloc,
+    .free = subghz_protocol_decoder_ditec_gol4_free,
+
+    .feed = subghz_protocol_decoder_ditec_gol4_feed,
+    .reset = subghz_protocol_decoder_ditec_gol4_reset,
+
+    .get_hash_data = subghz_protocol_decoder_ditec_gol4_get_hash_data,
+    .serialize = subghz_protocol_decoder_ditec_gol4_serialize,
+    .deserialize = subghz_protocol_decoder_ditec_gol4_deserialize,
+    .get_string = subghz_protocol_decoder_ditec_gol4_get_string,
+};
+
+const SubGhzProtocolEncoder subghz_protocol_ditec_gol4_encoder = {
+    .alloc = subghz_protocol_encoder_ditec_gol4_alloc,
+    .free = subghz_protocol_encoder_ditec_gol4_free,
+
+    .deserialize = subghz_protocol_encoder_ditec_gol4_deserialize,
+    .stop = subghz_protocol_encoder_ditec_gol4_stop,
+    .yield = subghz_protocol_encoder_ditec_gol4_yield,
+};
+
+const SubGhzProtocol subghz_protocol_ditec_gol4 = {
+    .name = SUBGHZ_PROTOCOL_DITEC_GOL4_NAME,
+    .type = SubGhzProtocolTypeDynamic,
+    .flag = SubGhzProtocolFlag_433 | SubGhzProtocolFlag_AM | SubGhzProtocolFlag_Decodable |
+            SubGhzProtocolFlag_Load | SubGhzProtocolFlag_Save | SubGhzProtocolFlag_Send,
+
+    .decoder = &subghz_protocol_ditec_gol4_decoder,
+    .encoder = &subghz_protocol_ditec_gol4_encoder,
+};
+
+/**
+ * Defines the button value for the current btn_id
+ * Basic set | 0x1 | 0x2 | 0x4 | 0x8 | 0x0 PROG
+ * @return Button code
+ */
+static uint8_t subghz_protocol_ditec_gol4_get_btn_code(void);
+
+static uint8_t gol4_bit_reverse(uint8_t b) {
+    b &= 0xFF;
+    uint8_t result = 0;
+    for(uint8_t i = 0; i < 8; i++) {
+        result = (uint8_t)((result << 1) | (b & 1));
+        b >>= 1;
+    }
+    return result;
+}
+
+static uint8_t gol4_lcg_step(uint8_t seed, uint8_t steps) {
+    uint8_t x = seed & 0xFF;
+    steps &= 0xFF;
+    for(uint8_t i = 0; i < steps; i++) {
+        x = (uint8_t)((21 * x + 1) & 0xFF);
+    }
+    return x;
+}
+
+static uint8_t gol4_lcg_inverse(uint8_t target, uint8_t steps) {
+    steps &= 0xFF;
+    if(steps == 0) return target & 0xFF;
+    return gol4_lcg_step(target, (uint8_t)(256 - steps));
+}
+
+static void gol4_decode_rotate_and_bitrev(uint8_t* raw) {
+    uint8_t carry = 0;
+    for(uint8_t r = 0; r < 3; r++) {
+        for(uint8_t i = 2; i < 7; i++) {
+            uint8_t new_carry = raw[i] & 1;
+            raw[i] = (uint8_t)(((raw[i] >> 1) | (carry << 7)) & 0xFF);
+            carry = new_carry;
+        }
+    }
+
+    raw[0] = gol4_bit_reverse(raw[0]);
+    raw[1] = gol4_bit_reverse(raw[1]);
+    raw[3] = gol4_bit_reverse(raw[3]);
+    raw[4] = gol4_bit_reverse(raw[4]);
+
+    uint8_t b2 = raw[2] & 0xDF;
+    b2 = (uint8_t)(((b2 << 4) | (b2 >> 4)) & 0xFF);
+    b2 = (uint8_t)((~b2) & 0xFF);
+    raw[2] = gol4_bit_reverse(b2);
+
+    raw[5] = gol4_bit_reverse(raw[5]);
+    raw[6] = gol4_bit_reverse(raw[6]);
+}
+
+static bool gol4_decode_lcg_xor(uint8_t* raw) {
+    if(raw[6] & 0x80) raw[5] ^= 1;
+
+    uint8_t out5 = gol4_lcg_inverse(raw[5], 0xFE);
+    raw[5] = out5;
+
+    uint8_t out6 = gol4_lcg_inverse(raw[6], raw[5]);
+    raw[6] = out6;
+
+    raw[5] ^= 0xA7;
+    raw[6] ^= 0x69;
+    return true;
+}
+
+static bool gol4_rolling_decode(uint8_t* raw) {
+    gol4_decode_rotate_and_bitrev(raw);
+    return gol4_decode_lcg_xor(raw);
+}
+
+static bool gol4_encode_lcg_xor(uint8_t* raw) {
+    uint8_t dec5 = (uint8_t)(raw[5] ^ 0xA7);
+    uint8_t dec6 = (uint8_t)(raw[6] ^ 0x69);
+
+    uint8_t enc6 = gol4_lcg_step(dec6, dec5);
+    uint8_t enc5 = gol4_lcg_step(dec5, 0xFE);
+
+    if(enc6 & 0x80) enc5 ^= 1;
+
+    raw[5] = enc5;
+    raw[6] = enc6;
+    return true;
+}
+
+static void gol4_encode_bitrev_and_rotate(uint8_t* raw) {
+    raw[0] = gol4_bit_reverse(raw[0]);
+    raw[1] = gol4_bit_reverse(raw[1]);
+    raw[3] = gol4_bit_reverse(raw[3]);
+    raw[4] = gol4_bit_reverse(raw[4]);
+
+    if(raw[2] == 0x0) {
+        raw[2] = 0xF0;
+    }
+    uint8_t b2 = gol4_bit_reverse(raw[2]);
+    b2 = (uint8_t)(~b2);
+    b2 = (uint8_t)(((b2 << 4) | (b2 >> 4)) & 0xFF);
+    b2 &= 0xDF;
+    raw[2] = b2;
+
+    raw[5] = gol4_bit_reverse(raw[5]);
+    raw[6] = gol4_bit_reverse(raw[6]);
+
+    uint8_t carry = 0;
+    for(uint8_t r = 0; r < 3; r++) {
+        for(int8_t i = 6; i >= 2; i--) {
+            uint8_t new_carry = (uint8_t)((raw[i] >> 7) & 1);
+            raw[i] = (uint8_t)(((raw[i] << 1) | carry) & 0xFF);
+            carry = new_carry;
+        }
+    }
+}
+
+static bool gol4_rolling_encode(uint8_t* raw) {
+    if(!raw) return false;
+    if(!gol4_encode_lcg_xor(raw)) return false;
+    gol4_encode_bitrev_and_rotate(raw);
+    return true;
+}
+
+static void bits_to_raw(const uint8_t* bits, uint8_t* raw) {
+    memset(raw, 0, GOL4_RAW_BYTES);
+    for(uint8_t i = 0; i < subghz_protocol_ditec_gol4_const.min_count_bit_for_found; i++) {
+        uint8_t byte_idx = i / 8;
+        uint8_t bit_idx = 7 - (i % 8);
+        if(bits[i]) raw[byte_idx] |= (1 << bit_idx);
+    }
+}
+
+static void raw_to_bits(const uint8_t* raw, uint8_t* bits) {
+    for(uint8_t i = 0; i < subghz_protocol_ditec_gol4_const.min_count_bit_for_found; i++) {
+        uint8_t byte_idx = i / 8;
+        uint8_t bit_idx = 7 - (i % 8);
+        bits[i] = (uint8_t)((raw[byte_idx] >> bit_idx) & 1);
+    }
+}
+
+static uint64_t bits_to_data(const uint8_t* bits) {
+    uint64_t data = 0;
+    for(uint8_t i = 0; i < subghz_protocol_ditec_gol4_const.min_count_bit_for_found; i++) {
+        data = (data << 1) | (uint64_t)(bits[i] & 1);
+    }
+    return data;
+}
+
+static uint32_t serial_to_display(const uint8_t* s) {
+    if(!s) return 0;
+    return (uint32_t)((s[0] << 24) | (s[4] << 16) | (s[1] << 8) | s[3]);
+}
+
+void* subghz_protocol_encoder_ditec_gol4_alloc(SubGhzEnvironment* environment) {
+    UNUSED(environment);
+    SubGhzProtocolEncoderDitecGOL4* instance = malloc(sizeof(SubGhzProtocolEncoderDitecGOL4));
+
+    instance->base.protocol = &subghz_protocol_ditec_gol4;
+    instance->generic.protocol_name = instance->base.protocol->name;
+
+    instance->encoder.repeat = 4;
+    instance->encoder.size_upload = 128; // 110 actual
+    instance->encoder.upload = malloc(instance->encoder.size_upload * sizeof(LevelDuration));
+    instance->encoder.is_running = false;
+    return instance;
+}
+
+void subghz_protocol_encoder_ditec_gol4_free(void* context) {
+    furi_assert(context);
+    SubGhzProtocolEncoderDitecGOL4* instance = context;
+    free(instance->encoder.upload);
+    free(instance);
+}
+
+/**
+ * Generating an upload from data.
+ * @param instance Pointer to a SubGhzProtocolEncoderDitecGOL4 instance
+ */
+static void
+    subghz_protocol_encoder_ditec_gol4_get_upload(SubGhzProtocolEncoderDitecGOL4* instance) {
+    furi_assert(instance);
+    size_t index = 0;
+
+    // Send key and GAP between repeats
+    //Send gap before data
+    instance->encoder.upload[index++] =
+        level_duration_make(false, (uint32_t)subghz_protocol_ditec_gol4_const.te_long * 22);
+    // Start bit
+    instance->encoder.upload[index++] =
+        level_duration_make(true, (uint32_t)subghz_protocol_ditec_gol4_const.te_short * 2);
+
+    for(uint8_t i = instance->generic.data_count_bit; i > 0; i--) {
+        if(bit_read(instance->generic.data, i - 1)) {
+            // Send bit 1
+            instance->encoder.upload[index++] =
+                level_duration_make(false, (uint32_t)subghz_protocol_ditec_gol4_const.te_short);
+            instance->encoder.upload[index++] =
+                level_duration_make(true, (uint32_t)subghz_protocol_ditec_gol4_const.te_long);
+        } else {
+            // Send bit 0
+            instance->encoder.upload[index++] =
+                level_duration_make(false, (uint32_t)subghz_protocol_ditec_gol4_const.te_long);
+            instance->encoder.upload[index++] =
+                level_duration_make(true, (uint32_t)subghz_protocol_ditec_gol4_const.te_short);
+        }
+    }
+
+    instance->encoder.size_upload = index;
+    return;
+}
+
+/** 
+ * Analysis of received data
+ * @param instance Pointer to a SubGhzBlockGeneric* instance
+ */
+static void subghz_protocol_ditec_gol4_decode_key(SubGhzBlockGeneric* instance) {
+    // Ditec GOL4 Decoder
+    // 2025 - 2026.02 - @xMasterX (MMX) & @zero-mega
+    //
+    // RAW Samples
+    // 0xCCB2F83208122 - btn 1 = 0011001100101100 101111 100000110010000 01000000100100010
+    //
+    // Programming mode:
+    // 0xCCB1F832103B9 - btn 0 = 0011001100101100 011111 100000110010000 10000001110111001
+    // Regular buttons:
+    // 0xCCB2F8320ED66 - btn 1 = 0011001100101100 101111 100000110010000 01110110101100110
+    // 0xCCB37832104A6 - btn 2 = 0011001100101100 110111 100000110010000 10000010010100110
+    // 0xCCB3B8320DB4E - btn 4 = 0011001100101100 111011 100000110010000 01101101101001110
+    // 0xCCB3D8320E855 - btn 8 = 0011001100101100 111101 100000110010000 01110100001010101
+    //
+    // Regular buttons:
+    // Decoded array: CC 34 71 83 09 F8 C1
+    // Decoded array: CC 34 71 83 09 F9 C1
+    // Decoded array: CC 34 72 83 09 FA C1
+    // Decoded array: CC 34 74 83 09 FB C1
+    // Decoded array: CC 34 78 83 09 FC C1
+    // Programming mode
+    // Decoded array: CC 34 F0 83 09 FD C1
+    // Decoded array: CC 34 F0 83 09 FE C1
+    //
+    uint8_t bits[subghz_protocol_ditec_gol4_const.min_count_bit_for_found];
+    uint64_t data = instance->data;
+    for(int i = subghz_protocol_ditec_gol4_const.min_count_bit_for_found - 1; i >= 0; i--) {
+        bits[i] = (uint8_t)(data & 1);
+        data >>= 1;
+    }
+    uint8_t decrypted[GOL4_RAW_BYTES];
+    bits_to_raw(bits, decrypted);
+
+    if(gol4_rolling_decode(decrypted)) {
+        uint8_t temp_serial[5];
+        memcpy(temp_serial, decrypted, 5);
+        instance->serial = serial_to_display(temp_serial);
+        instance->btn = decrypted[2] & 0x0F;
+        instance->cnt = (uint16_t)((decrypted[5] | (decrypted[6] << 8)) & 0xFFFF);
+        // Save original button for later use
+        if(subghz_custom_btn_get_original() == 0) {
+            subghz_custom_btn_set_original(instance->btn);
+        }
+        subghz_custom_btn_set_max(4);
+    }
+}
+
+static void subghz_protocol_ditec_gol4_encode_key(SubGhzBlockGeneric* instance) {
+    // Encoder crypto part:
+    //
+    // TODO: Current issue - last bit at original remote sometimes 0 but we encode as 1, or vice versa.
+    // This does not affect decoding but may have issue on real receiver
+    //
+    uint8_t decrypted[GOL4_RAW_BYTES];
+
+    // Save original button for later use
+    if(subghz_custom_btn_get_original() == 0) {
+        subghz_custom_btn_set_original(instance->btn);
+    }
+
+    instance->btn = subghz_protocol_ditec_gol4_get_btn_code();
+
+    // override button if we change it with signal settings button editor
+    if(subghz_block_generic_global_button_override_get(&instance->btn))
+        FURI_LOG_D(TAG, "Button sucessfully changed to 0x%X", instance->btn);
+
+    // Check for OFEX (overflow experimental) mode
+    if(furi_hal_subghz_get_rolling_counter_mult() != -0x7FFFFFFF) {
+        // standart counter mode. PULL data from subghz_block_generic_global variables
+        if(!subghz_block_generic_global_counter_override_get(&instance->cnt)) {
+            // if counter_override_get return FALSE then counter was not changed and we increase counter by standart mult value
+            if((instance->cnt + furi_hal_subghz_get_rolling_counter_mult()) > 0xFFFF) {
+                instance->cnt = 0;
+            } else {
+                instance->cnt += furi_hal_subghz_get_rolling_counter_mult();
+            }
+        }
+    } else {
+        if((instance->cnt + 0x1) > 0xFFFF) {
+            instance->cnt = 0;
+        } else if(instance->cnt >= 0x1 && instance->cnt != 0xFFFE) {
+            instance->cnt = 0xFFFE;
+        } else {
+            instance->cnt++;
+        }
+    }
+
+    decrypted[0] = (uint8_t)((instance->serial >> 24) & 0xFF);
+    decrypted[4] = (uint8_t)((instance->serial >> 16) & 0xFF);
+    decrypted[1] = (uint8_t)((instance->serial >> 8) & 0xFF);
+    decrypted[3] = (uint8_t)(instance->serial & 0xFF);
+    decrypted[2] = (uint8_t)(instance->btn & 0x0F);
+
+    uint16_t counter = (uint16_t)(instance->cnt & 0xFFFF);
+    decrypted[5] = (uint8_t)(counter & 0xFF);
+    decrypted[6] = (uint8_t)((counter >> 8) & 0xFF);
+
+    gol4_rolling_encode(decrypted);
+
+    uint8_t bits[subghz_protocol_ditec_gol4_const.min_count_bit_for_found];
+    raw_to_bits(decrypted, bits);
+    instance->data = bits_to_data(bits);
+}
+
+SubGhzProtocolStatus
+    subghz_protocol_encoder_ditec_gol4_deserialize(void* context, FlipperFormat* flipper_format) {
+    furi_assert(context);
+    SubGhzProtocolEncoderDitecGOL4* instance = context;
+    SubGhzProtocolStatus ret = SubGhzProtocolStatusError;
+    do {
+        ret = subghz_block_generic_deserialize_check_count_bit(
+            &instance->generic,
+            flipper_format,
+            subghz_protocol_ditec_gol4_const.min_count_bit_for_found);
+        if(ret != SubGhzProtocolStatusOk) {
+            break;
+        }
+        // Optional parameter
+        flipper_format_read_uint32(
+            flipper_format, "Repeat", (uint32_t*)&instance->encoder.repeat, 1);
+
+        subghz_protocol_ditec_gol4_decode_key(&instance->generic);
+        subghz_protocol_ditec_gol4_encode_key(&instance->generic);
+        subghz_protocol_encoder_ditec_gol4_get_upload(instance);
+
+        if(!flipper_format_rewind(flipper_format)) {
+            FURI_LOG_E(TAG, "Rewind error");
+            break;
+        }
+        uint8_t key_data[sizeof(uint64_t)] = {0};
+        for(size_t i = 0; i < sizeof(uint64_t); i++) {
+            key_data[sizeof(uint64_t) - i - 1] = (instance->generic.data >> i * 8) & 0xFF;
+        }
+        if(!flipper_format_update_hex(flipper_format, "Key", key_data, sizeof(uint64_t))) {
+            FURI_LOG_E(TAG, "Unable to update Key");
+            break;
+        }
+
+        instance->encoder.is_running = true;
+    } while(false);
+
+    return ret;
+}
+
+void subghz_protocol_encoder_ditec_gol4_stop(void* context) {
+    SubGhzProtocolEncoderDitecGOL4* instance = context;
+    instance->encoder.is_running = false;
+}
+
+LevelDuration subghz_protocol_encoder_ditec_gol4_yield(void* context) {
+    SubGhzProtocolEncoderDitecGOL4* instance = context;
+
+    if(instance->encoder.repeat == 0 || !instance->encoder.is_running) {
+        instance->encoder.is_running = false;
+        return level_duration_reset();
+    }
+
+    LevelDuration ret = instance->encoder.upload[instance->encoder.front];
+
+    if(++instance->encoder.front == instance->encoder.size_upload) {
+        if(!subghz_block_generic_global.endless_tx) instance->encoder.repeat--;
+        instance->encoder.front = 0;
+    }
+
+    return ret;
+}
+
+void* subghz_protocol_decoder_ditec_gol4_alloc(SubGhzEnvironment* environment) {
+    UNUSED(environment);
+    SubGhzProtocolDecoderDitecGOL4* instance = malloc(sizeof(SubGhzProtocolDecoderDitecGOL4));
+    instance->base.protocol = &subghz_protocol_ditec_gol4;
+    instance->generic.protocol_name = instance->base.protocol->name;
+    return instance;
+}
+
+void subghz_protocol_decoder_ditec_gol4_free(void* context) {
+    furi_assert(context);
+    SubGhzProtocolDecoderDitecGOL4* instance = context;
+    free(instance);
+}
+
+void subghz_protocol_decoder_ditec_gol4_reset(void* context) {
+    furi_assert(context);
+    SubGhzProtocolDecoderDitecGOL4* instance = context;
+    instance->decoder.parser_step = DitecGOL4DecoderStepReset;
+}
+
+void subghz_protocol_decoder_ditec_gol4_feed(void* context, bool level, uint32_t duration) {
+    furi_check(context);
+    SubGhzProtocolDecoderDitecGOL4* instance = context;
+
+    switch(instance->decoder.parser_step) {
+    case DitecGOL4DecoderStepReset:
+        if((!level) && (DURATION_DIFF(duration, subghz_protocol_ditec_gol4_const.te_long * 22) <
+                        (subghz_protocol_ditec_gol4_const.te_long * 4))) {
+            instance->decoder.decode_data = 0;
+            instance->decoder.decode_count_bit = 0;
+            instance->decoder.parser_step = DitecGOL4DecoderStepStartBit;
+        }
+        break;
+
+    case DitecGOL4DecoderStepStartBit:
+        if((level) && (DURATION_DIFF(duration, subghz_protocol_ditec_gol4_const.te_short * 2) <
+                       subghz_protocol_ditec_gol4_const.te_delta)) {
+            instance->decoder.parser_step = DitecGOL4DecoderStepSaveDuration;
+        } else {
+            instance->decoder.parser_step = DitecGOL4DecoderStepReset;
+        }
+        break;
+
+    case DitecGOL4DecoderStepSaveDuration:
+        if(!level) {
+            instance->decoder.te_last = duration;
+            instance->decoder.parser_step = DitecGOL4DecoderStepCheckDuration;
+        } else {
+            instance->decoder.parser_step = DitecGOL4DecoderStepReset;
+        }
+        break;
+
+    case DitecGOL4DecoderStepCheckDuration:
+        if(level) {
+            if((DURATION_DIFF(
+                    instance->decoder.te_last, subghz_protocol_ditec_gol4_const.te_short) <
+                subghz_protocol_ditec_gol4_const.te_delta) &&
+               (DURATION_DIFF(duration, subghz_protocol_ditec_gol4_const.te_long) <
+                subghz_protocol_ditec_gol4_const.te_delta)) {
+                subghz_protocol_blocks_add_bit(&instance->decoder, 1);
+                instance->decoder.parser_step = DitecGOL4DecoderStepSaveDuration;
+            } else if(
+                (DURATION_DIFF(
+                     instance->decoder.te_last, subghz_protocol_ditec_gol4_const.te_long) <
+                 subghz_protocol_ditec_gol4_const.te_delta) &&
+                (DURATION_DIFF(duration, subghz_protocol_ditec_gol4_const.te_short) <
+                 subghz_protocol_ditec_gol4_const.te_delta)) {
+                subghz_protocol_blocks_add_bit(&instance->decoder, 0);
+                instance->decoder.parser_step = DitecGOL4DecoderStepSaveDuration;
+            }
+        } else {
+            if(DURATION_DIFF(
+                   instance->decoder.te_last, subghz_protocol_ditec_gol4_const.te_long * 20) <
+               (subghz_protocol_ditec_gol4_const.te_long * 3)) {
+                if(instance->decoder.decode_count_bit ==
+                   subghz_protocol_ditec_gol4_const.min_count_bit_for_found) {
+                    // 54 bits received, save and continue
+                    instance->generic.data = instance->decoder.decode_data;
+                    instance->generic.data_count_bit =
+                        subghz_protocol_ditec_gol4_const.min_count_bit_for_found;
+
+                    if(instance->base.callback) {
+                        instance->base.callback(&instance->base, instance->base.context);
+                    }
+                }
+                instance->decoder.decode_data = 0;
+                instance->decoder.decode_count_bit = 0;
+                instance->decoder.parser_step = DitecGOL4DecoderStepReset;
+            } else {
+                instance->decoder.parser_step = DitecGOL4DecoderStepReset;
+            }
+        }
+        break;
+    }
+}
+
+uint8_t subghz_protocol_decoder_ditec_gol4_get_hash_data(void* context) {
+    furi_assert(context);
+    SubGhzProtocolDecoderDitecGOL4* instance = context;
+    return subghz_protocol_blocks_get_hash_data(
+        &instance->decoder, (instance->decoder.decode_count_bit / 8) + 1);
+}
+
+SubGhzProtocolStatus subghz_protocol_decoder_ditec_gol4_serialize(
+    void* context,
+    FlipperFormat* flipper_format,
+    SubGhzRadioPreset* preset) {
+    furi_assert(context);
+    SubGhzProtocolDecoderDitecGOL4* instance = context;
+    return subghz_block_generic_serialize(&instance->generic, flipper_format, preset);
+}
+
+SubGhzProtocolStatus
+    subghz_protocol_decoder_ditec_gol4_deserialize(void* context, FlipperFormat* flipper_format) {
+    furi_assert(context);
+    SubGhzProtocolDecoderDitecGOL4* instance = context;
+    return subghz_block_generic_deserialize_check_count_bit(
+        &instance->generic,
+        flipper_format,
+        subghz_protocol_ditec_gol4_const.min_count_bit_for_found);
+}
+
+bool subghz_protocol_ditec_gol4_create_data(
+    void* context,
+    FlipperFormat* flipper_format,
+    uint32_t serial,
+    uint8_t btn,
+    uint16_t cnt,
+    SubGhzRadioPreset* preset) {
+    furi_assert(context);
+    SubGhzProtocolEncoderDitecGOL4* instance = context;
+    instance->generic.btn = btn;
+    instance->generic.serial = serial;
+    instance->generic.cnt = cnt;
+    instance->generic.data_count_bit = subghz_protocol_ditec_gol4_const.min_count_bit_for_found;
+
+    subghz_protocol_ditec_gol4_encode_key(&instance->generic);
+
+    return SubGhzProtocolStatusOk ==
+           subghz_block_generic_serialize(&instance->generic, flipper_format, preset);
+}
+
+static uint8_t subghz_protocol_ditec_gol4_get_btn_code(void) {
+    uint8_t custom_btn_id = subghz_custom_btn_get();
+    uint8_t original_btn_code = subghz_custom_btn_get_original();
+    uint8_t btn = original_btn_code;
+
+    // Set custom button
+    if((custom_btn_id == SUBGHZ_CUSTOM_BTN_OK) && (original_btn_code != 0)) {
+        // Restore original button code
+        btn = original_btn_code;
+    } else if(custom_btn_id == SUBGHZ_CUSTOM_BTN_UP) {
+        switch(original_btn_code) {
+        case 0x1:
+            btn = 0x2;
+            break;
+        case 0x2:
+            btn = 0x1;
+            break;
+        case 0x4:
+            btn = 0x1;
+            break;
+        case 0x8:
+            btn = 0x1;
+            break;
+        case 0x0:
+            btn = 0x1;
+            break;
+
+        default:
+            break;
+        }
+    } else if(custom_btn_id == SUBGHZ_CUSTOM_BTN_DOWN) {
+        switch(original_btn_code) {
+        case 0x1:
+            btn = 0x4;
+            break;
+        case 0x2:
+            btn = 0x4;
+            break;
+        case 0x4:
+            btn = 0x2;
+            break;
+        case 0x8:
+            btn = 0x4;
+            break;
+        case 0x0:
+            btn = 0x4;
+            break;
+
+        default:
+            break;
+        }
+    } else if(custom_btn_id == SUBGHZ_CUSTOM_BTN_LEFT) {
+        switch(original_btn_code) {
+        case 0x1:
+            btn = 0x8;
+            break;
+        case 0x2:
+            btn = 0x8;
+            break;
+        case 0x4:
+            btn = 0x8;
+            break;
+        case 0x8:
+            btn = 0x2;
+            break;
+        case 0x0:
+            btn = 0x2;
+            break;
+
+        default:
+            break;
+        }
+    } else if(custom_btn_id == SUBGHZ_CUSTOM_BTN_RIGHT) {
+        switch(original_btn_code) {
+        case 0x1:
+            btn = 0x0;
+            break;
+        case 0x2:
+            btn = 0x0;
+            break;
+        case 0x4:
+            btn = 0x0;
+            break;
+        case 0x8:
+            btn = 0x0;
+            break;
+        case 0x0:
+            btn = 0x8;
+            break;
+
+        default:
+            break;
+        }
+    }
+
+    return btn;
+}
+
+void subghz_protocol_decoder_ditec_gol4_get_string(void* context, FuriString* output) {
+    furi_assert(context);
+    SubGhzProtocolDecoderDitecGOL4* instance = context;
+
+    subghz_protocol_ditec_gol4_decode_key(&instance->generic);
+
+    // push protocol data to global variable
+    subghz_block_generic_global.cnt_is_available = true;
+    subghz_block_generic_global.cnt_length_bit = 16;
+    subghz_block_generic_global.current_cnt = instance->generic.cnt;
+
+    subghz_block_generic_global.btn_is_available = true;
+    subghz_block_generic_global.current_btn = instance->generic.btn;
+    subghz_block_generic_global.btn_length_bit = 4;
+    //
+
+    furi_string_cat_printf(
+        output,
+        "%s %db\r\n"
+        "Key:0x%0lX%08lX\r\n"
+        "Serial:0x%08lX\r\n"
+        "Btn:%01X %s\r\n"
+        "Cnt:%04lX",
+        instance->generic.protocol_name,
+        instance->generic.data_count_bit,
+        (uint32_t)(instance->generic.data >> 32),
+        (uint32_t)(instance->generic.data & 0xFFFFFFFF),
+        instance->generic.serial,
+        instance->generic.btn,
+        (instance->generic.btn == 0x0) ? "- Prog" : "",
+        instance->generic.cnt);
+}

lib/subghz/protocols/ditec_gol4.h

@@ -0,0 +1,109 @@
+#pragma once
+
+#include "base.h"
+
+#define SUBGHZ_PROTOCOL_DITEC_GOL4_NAME "Ditec GOL4"
+
+typedef struct SubGhzProtocolDecoderDitecGOL4 SubGhzProtocolDecoderDitecGOL4;
+typedef struct SubGhzProtocolEncoderDitecGOL4 SubGhzProtocolEncoderDitecGOL4;
+
+extern const SubGhzProtocolDecoder subghz_protocol_ditec_gol4_decoder;
+extern const SubGhzProtocolEncoder subghz_protocol_ditec_gol4_encoder;
+extern const SubGhzProtocol subghz_protocol_ditec_gol4;
+
+/**
+ * Allocate SubGhzProtocolEncoderDitecGOL4.
+ * @param environment Pointer to a SubGhzEnvironment instance
+ * @return SubGhzProtocolEncoderDitecGOL4* pointer to a SubGhzProtocolEncoderDitecGOL4 instance
+ */
+void* subghz_protocol_encoder_ditec_gol4_alloc(SubGhzEnvironment* environment);
+
+/**
+ * Free SubGhzProtocolEncoderDitecGOL4.
+ * @param context Pointer to a SubGhzProtocolEncoderDitecGOL4 instance
+ */
+void subghz_protocol_encoder_ditec_gol4_free(void* context);
+
+/**
+ * Deserialize and generating an upload to send.
+ * @param context Pointer to a SubGhzProtocolEncoderDitecGOL4 instance
+ * @param flipper_format Pointer to a FlipperFormat instance
+ * @return status
+ */
+SubGhzProtocolStatus
+    subghz_protocol_encoder_ditec_gol4_deserialize(void* context, FlipperFormat* flipper_format);
+
+/**
+ * Forced transmission stop.
+ * @param context Pointer to a SubGhzProtocolEncoderDitecGOL4 instance
+ */
+void subghz_protocol_encoder_ditec_gol4_stop(void* context);
+
+/**
+ * Getting the level and duration of the upload to be loaded into DMA.
+ * @param context Pointer to a SubGhzProtocolEncoderDitecGOL4 instance
+ * @return LevelDuration 
+ */
+LevelDuration subghz_protocol_encoder_ditec_gol4_yield(void* context);
+
+/**
+ * Allocate SubGhzProtocolDecoderDitecGOL4.
+ * @param environment Pointer to a SubGhzEnvironment instance
+ * @return SubGhzProtocolDecoderDitecGOL4* pointer to a SubGhzProtocolDecoderDitecGOL4 instance
+ */
+void* subghz_protocol_decoder_ditec_gol4_alloc(SubGhzEnvironment* environment);
+
+/**
+ * Free SubGhzProtocolDecoderDitecGOL4.
+ * @param context Pointer to a SubGhzProtocolDecoderDitecGOL4 instance
+ */
+void subghz_protocol_decoder_ditec_gol4_free(void* context);
+
+/**
+ * Reset decoder SubGhzProtocolDecoderDitecGOL4.
+ * @param context Pointer to a SubGhzProtocolDecoderDitecGOL4 instance
+ */
+void subghz_protocol_decoder_ditec_gol4_reset(void* context);
+
+/**
+ * Parse a raw sequence of levels and durations received from the air.
+ * @param context Pointer to a SubGhzProtocolDecoderDitecGOL4 instance
+ * @param level Signal level true-high false-low
+ * @param duration Duration of this level in, us
+ */
+void subghz_protocol_decoder_ditec_gol4_feed(void* context, bool level, uint32_t duration);
+
+/**
+ * Getting the hash sum of the last randomly received parcel.
+ * @param context Pointer to a SubGhzProtocolDecoderDitecGOL4 instance
+ * @return hash Hash sum
+ */
+uint8_t subghz_protocol_decoder_ditec_gol4_get_hash_data(void* context);
+
+/**
+ * Serialize data SubGhzProtocolDecoderDitecGOL4.
+ * @param context Pointer to a SubGhzProtocolDecoderDitecGOL4 instance
+ * @param flipper_format Pointer to a FlipperFormat instance
+ * @param preset The modulation on which the signal was received, SubGhzRadioPreset
+ * @return status
+ */
+SubGhzProtocolStatus subghz_protocol_decoder_ditec_gol4_serialize(
+    void* context,
+    FlipperFormat* flipper_format,
+    SubGhzRadioPreset* preset);
+
+/**
+ * Deserialize data SubGhzProtocolDecoderDitecGOL4.
+ * @param context Pointer to a SubGhzProtocolDecoderDitecGOL4 instance
+ * @param flipper_format Pointer to a FlipperFormat instance
+ * @return status
+ */
+SubGhzProtocolStatus
+    subghz_protocol_decoder_ditec_gol4_deserialize(void* context, FlipperFormat* flipper_format);
+
+/**
+ * Getting a textual representation of the received data.
+ * @param context Pointer to a SubGhzProtocolDecoderDitecGOL4 instance
+ * @param output Resulting text
+ */
+void subghz_protocol_decoder_ditec_gol4_get_string(void* context, FuriString* output);

lib/subghz/protocols/protocol_items.c

@@ -28,6 +28,7 @@ const SubGhzProtocol* const subghz_protocol_registry_items[] = {
     &subghz_protocol_feron,         &subghz_protocol_roger,
     &subghz_protocol_elplast,       &subghz_protocol_treadmill37,
     &subghz_protocol_beninca_arc,   &subghz_protocol_jarolift,
+    &subghz_protocol_ditec_gol4,
 };
 
 const SubGhzProtocolRegistry subghz_protocol_registry = {

lib/subghz/protocols/protocol_items.h

@@ -56,3 +56,4 @@
 #include "treadmill37.h"
 #include "beninca_arc.h"
 #include "jarolift.h"
+#include "ditec_gol4.h"

lib/subghz/protocols/public_api.h

@@ -249,6 +249,24 @@ bool subghz_protocol_jarolift_create_data(
     uint16_t cnt,
     SubGhzRadioPreset* preset);
 
+/**
+ * Key generation from simple data.
+ * @param context Pointer to a SubGhzProtocolEncoderDitecGOL4 instance
+ * @param flipper_format Pointer to a FlipperFormat instance
+ * @param serial Serial number
+ * @param btn Button number, 8 bit
+ * @param cnt Counter value, 16 bit
+ * @param preset Modulation, SubGhzRadioPreset
+ * @return true On success
+ */
+bool subghz_protocol_ditec_gol4_create_data(
+    void* context,
+    FlipperFormat* flipper_format,
+    uint32_t serial,
+    uint8_t btn,
+    uint16_t cnt,
+    SubGhzRadioPreset* preset);
+
 typedef struct SubGhzProtocolDecoderBinRAW SubGhzProtocolDecoderBinRAW;
 
 void subghz_protocol_decoder_bin_raw_data_input_rssi(