weather_station: add oregon3 protocol support with THGR221

applications/external/weather_station/protocols/oregon3.c

@@ -0,0 +1,365 @@
+#include "oregon3.h"
+
+#include <lib/subghz/blocks/const.h>
+#include <lib/subghz/blocks/decoder.h>
+#include <lib/subghz/blocks/encoder.h>
+#include <lib/subghz/blocks/math.h>
+#include "ws_generic.h"
+
+#include <lib/toolbox/manchester_decoder.h>
+#include <lib/flipper_format/flipper_format_i.h>
+
+#define TAG "WSProtocolOregon3"
+
+static const SubGhzBlockConst ws_oregon3_const = {
+    .te_long = 1100,
+    .te_short = 500,
+    .te_delta = 300,
+    .min_count_bit_for_found = 32,
+};
+
+#define OREGON3_PREAMBLE_BITS 28
+#define OREGON3_PREAMBLE_MASK 0b1111111111111111111111111111
+// 24 ones + 0101 (inverted A)
+#define OREGON3_PREAMBLE 0b1111111111111111111111110101
+
+// Fixed part contains:
+// - Sensor type: 16 bits
+// - Channel: 4 bits
+// - ID (changes when batteries are changed): 8 bits
+// - Battery status: 4 bits
+#define OREGON3_FIXED_PART_BITS (16 + 4 + 8 + 4)
+#define OREGON3_SENSOR_ID(d) (((d) >> 16) & 0xFFFF)
+#define OREGON3_CHECKSUM_BITS 8
+
+// bit indicating the low battery
+#define OREGON3_FLAG_BAT_LOW 0x4
+
+/// Documentation for Oregon Scientific protocols can be found here:
+/// https://www.osengr.org/Articles/OS-RF-Protocols-IV.pdf
+// Sensors ID
+#define ID_THGR221 0xf824
+
+struct WSProtocolDecoderOregon3 {
+    SubGhzProtocolDecoderBase base;
+
+    SubGhzBlockDecoder decoder;
+    WSBlockGeneric generic;
+    ManchesterState manchester_state;
+    bool prev_bit;
+
+    uint8_t var_bits;
+    uint64_t var_data;
+};
+
+typedef struct WSProtocolDecoderOregon3 WSProtocolDecoderOregon3;
+
+typedef enum {
+    Oregon3DecoderStepReset = 0,
+    Oregon3DecoderStepFoundPreamble,
+    Oregon3DecoderStepVarData,
+} Oregon3DecoderStep;
+
+void* ws_protocol_decoder_oregon3_alloc(SubGhzEnvironment* environment) {
+    UNUSED(environment);
+    WSProtocolDecoderOregon3* instance = malloc(sizeof(WSProtocolDecoderOregon3));
+    instance->base.protocol = &ws_protocol_oregon3;
+    instance->generic.protocol_name = instance->base.protocol->name;
+    instance->generic.humidity = WS_NO_HUMIDITY;
+    instance->generic.temp = WS_NO_TEMPERATURE;
+    instance->generic.btn = WS_NO_BTN;
+    instance->generic.channel = WS_NO_CHANNEL;
+    instance->generic.battery_low = WS_NO_BATT;
+    instance->generic.id = WS_NO_ID;
+    instance->prev_bit = false;
+    return instance;
+}
+
+void ws_protocol_decoder_oregon3_free(void* context) {
+    furi_assert(context);
+    WSProtocolDecoderOregon3* instance = context;
+    free(instance);
+}
+
+void ws_protocol_decoder_oregon3_reset(void* context) {
+    furi_assert(context);
+    WSProtocolDecoderOregon3* instance = context;
+    instance->decoder.parser_step = Oregon3DecoderStepReset;
+    instance->decoder.decode_data = 0UL;
+    instance->decoder.decode_count_bit = 0;
+    manchester_advance(
+        instance->manchester_state, ManchesterEventReset, &instance->manchester_state, NULL);
+    instance->prev_bit = false;
+    instance->var_data = 0;
+    instance->var_bits = 0;
+}
+
+static ManchesterEvent level_and_duration_to_event(bool level, uint32_t duration) {
+    bool is_long = false;
+
+    if(DURATION_DIFF(duration, ws_oregon3_const.te_long) < ws_oregon3_const.te_delta) {
+        is_long = true;
+    } else if(DURATION_DIFF(duration, ws_oregon3_const.te_short) < ws_oregon3_const.te_delta) {
+        is_long = false;
+    } else {
+        return ManchesterEventReset;
+    }
+
+    if(level)
+        return is_long ? ManchesterEventLongHigh : ManchesterEventShortHigh;
+    else
+        return is_long ? ManchesterEventLongLow : ManchesterEventShortLow;
+}
+
+// From sensor id code return amount of bits in variable section
+// https://temofeev.ru/info/articles/o-dekodirovanii-protokola-pogodnykh-datchikov-oregon-scientific
+static uint8_t oregon3_sensor_id_var_bits(uint16_t sensor_id) {
+    switch(sensor_id) {
+    case ID_THGR221:
+    default:
+        // nibbles: temp + hum + '0'
+        return (4 + 2 + 1) * 4;
+    }
+}
+
+static void ws_oregon3_decode_const_data(WSBlockGeneric* ws_block) {
+    ws_block->id = OREGON3_SENSOR_ID(ws_block->data);
+    ws_block->channel = (ws_block->data >> 12) & 0xF;
+    ws_block->battery_low = (ws_block->data & OREGON3_FLAG_BAT_LOW) ? 1 : 0;
+}
+
+static uint16_t ws_oregon3_bcd_decode_short(uint32_t data) {
+    return (data & 0xF) * 10 + ((data >> 4) & 0xF);
+}
+
+static float ws_oregon3_decode_temp(uint32_t data) {
+    int32_t temp_val;
+    temp_val = ws_oregon3_bcd_decode_short(data >> 4);
+    temp_val *= 10;
+    temp_val += (data >> 12) & 0xF;
+    if(data & 0xF) temp_val = -temp_val;
+    return (float)temp_val / 10.0;
+}
+
+static void ws_oregon3_decode_var_data(WSBlockGeneric* ws_b, uint16_t sensor_id, uint32_t data) {
+    switch(sensor_id) {
+    case ID_THGR221:
+    default:
+        ws_b->humidity = ws_oregon3_bcd_decode_short(data >> 4);
+        ws_b->temp = ws_oregon3_decode_temp(data >> 12);
+        break;
+    }
+}
+
+void ws_protocol_decoder_oregon3_feed(void* context, bool level, uint32_t duration) {
+    furi_assert(context);
+    WSProtocolDecoderOregon3* instance = context;
+    // Oregon v3.0 protocol is inverted
+    ManchesterEvent event = level_and_duration_to_event(!level, duration);
+
+    // low-level bit sequence decoding
+    if(event == ManchesterEventReset) {
+        instance->decoder.parser_step = Oregon3DecoderStepReset;
+        instance->prev_bit = false;
+        instance->decoder.decode_data = 0UL;
+        instance->decoder.decode_count_bit = 0;
+    }
+    if(manchester_advance(
+           instance->manchester_state, event, &instance->manchester_state, &instance->prev_bit)) {
+        subghz_protocol_blocks_add_bit(&instance->decoder, instance->prev_bit);
+    }
+
+    switch(instance->decoder.parser_step) {
+    case Oregon3DecoderStepReset:
+        // waiting for fixed oregon3 preamble
+        if(instance->decoder.decode_count_bit >= OREGON3_PREAMBLE_BITS &&
+           ((instance->decoder.decode_data & OREGON3_PREAMBLE_MASK) == OREGON3_PREAMBLE)) {
+            instance->decoder.parser_step = Oregon3DecoderStepFoundPreamble;
+            instance->decoder.decode_count_bit = 0;
+            instance->decoder.decode_data = 0UL;
+        }
+        break;
+    case Oregon3DecoderStepFoundPreamble:
+        // waiting for fixed oregon3 data
+        if(instance->decoder.decode_count_bit == OREGON3_FIXED_PART_BITS) {
+            instance->generic.data = instance->decoder.decode_data;
+            instance->generic.data_count_bit = instance->decoder.decode_count_bit;
+            instance->decoder.decode_data = 0UL;
+            instance->decoder.decode_count_bit = 0;
+
+            // reverse nibbles in decoded data as oregon v3.0 is LSB first
+            instance->generic.data = (instance->generic.data & 0x55555555) << 1 |
+                                     (instance->generic.data & 0xAAAAAAAA) >> 1;
+            instance->generic.data = (instance->generic.data & 0x33333333) << 2 |
+                                     (instance->generic.data & 0xCCCCCCCC) >> 2;
+
+            ws_oregon3_decode_const_data(&instance->generic);
+            instance->var_bits =
+                oregon3_sensor_id_var_bits(OREGON3_SENSOR_ID(instance->generic.data));
+
+            if(!instance->var_bits) {
+                // sensor is not supported, stop decoding, but showing the decoded fixed part
+                instance->decoder.parser_step = Oregon3DecoderStepReset;
+                if(instance->base.callback)
+                    instance->base.callback(&instance->base, instance->base.context);
+            } else {
+                instance->decoder.parser_step = Oregon3DecoderStepVarData;
+            }
+        }
+        break;
+    case Oregon3DecoderStepVarData:
+        // waiting for variable (sensor-specific data)
+        if(instance->decoder.decode_count_bit == instance->var_bits + OREGON3_CHECKSUM_BITS) {
+            instance->var_data = instance->decoder.decode_data & 0xFFFFFFFFFFFFFFFF;
+
+            // reverse nibbles in var data
+            instance->var_data = (instance->var_data & 0x5555555555555555) << 1 |
+                                 (instance->var_data & 0xAAAAAAAAAAAAAAAA) >> 1;
+            instance->var_data = (instance->var_data & 0x3333333333333333) << 2 |
+                                 (instance->var_data & 0xCCCCCCCCCCCCCCCC) >> 2;
+
+            ws_oregon3_decode_var_data(
+                &instance->generic,
+                OREGON3_SENSOR_ID(instance->generic.data),
+                instance->var_data >> OREGON3_CHECKSUM_BITS);
+
+            instance->decoder.parser_step = Oregon3DecoderStepReset;
+            if(instance->base.callback)
+                instance->base.callback(&instance->base, instance->base.context);
+        }
+        break;
+    }
+}
+
+uint8_t ws_protocol_decoder_oregon3_get_hash_data(void* context) {
+    furi_assert(context);
+    WSProtocolDecoderOregon3* instance = context;
+    return subghz_protocol_blocks_get_hash_data(
+        &instance->decoder, (instance->decoder.decode_count_bit / 8) + 1);
+}
+
+SubGhzProtocolStatus ws_protocol_decoder_oregon3_serialize(
+    void* context,
+    FlipperFormat* flipper_format,
+    SubGhzRadioPreset* preset) {
+    furi_assert(context);
+    WSProtocolDecoderOregon3* instance = context;
+    SubGhzProtocolStatus ret = SubGhzProtocolStatusError;
+    ret = ws_block_generic_serialize(&instance->generic, flipper_format, preset);
+    if(ret != SubGhzProtocolStatusOk) return ret;
+    uint32_t temp = instance->var_bits;
+    if(!flipper_format_write_uint32(flipper_format, "VarBits", &temp, 1)) {
+        FURI_LOG_E(TAG, "Error adding VarBits");
+        return SubGhzProtocolStatusErrorParserOthers;
+    }
+    if(!flipper_format_write_hex(
+           flipper_format,
+           "VarData",
+           (const uint8_t*)&instance->var_data,
+           sizeof(instance->var_data))) {
+        FURI_LOG_E(TAG, "Error adding VarData");
+        return SubGhzProtocolStatusErrorParserOthers;
+    }
+    return ret;
+}
+
+SubGhzProtocolStatus
+    ws_protocol_decoder_oregon3_deserialize(void* context, FlipperFormat* flipper_format) {
+    furi_assert(context);
+    WSProtocolDecoderOregon3* instance = context;
+    uint32_t temp_data;
+    SubGhzProtocolStatus ret = SubGhzProtocolStatusError;
+    do {
+        ret = ws_block_generic_deserialize(&instance->generic, flipper_format);
+        if(ret != SubGhzProtocolStatusOk) {
+            break;
+        }
+        if(!flipper_format_read_uint32(flipper_format, "VarBits", &temp_data, 1)) {
+            FURI_LOG_E(TAG, "Missing VarLen");
+            ret = SubGhzProtocolStatusErrorParserOthers;
+            break;
+        }
+        instance->var_bits = (uint8_t)temp_data;
+        if(!flipper_format_read_hex(
+               flipper_format,
+               "VarData",
+               (uint8_t*)&instance->var_data,
+               sizeof(instance->var_data))) { //-V1051
+            FURI_LOG_E(TAG, "Missing VarData");
+            ret = SubGhzProtocolStatusErrorParserOthers;
+            break;
+        }
+        if(instance->generic.data_count_bit != ws_oregon3_const.min_count_bit_for_found) {
+            FURI_LOG_E(TAG, "Wrong number of bits in key: %d", instance->generic.data_count_bit);
+            ret = SubGhzProtocolStatusErrorValueBitCount;
+            break;
+        }
+    } while(false);
+    return ret;
+}
+
+static void oregon3_append_check_sum(uint32_t fix_data, uint64_t var_data, FuriString* output) {
+    uint8_t sum = fix_data & 0xF;
+    uint8_t ref_sum = var_data & 0xFF;
+    var_data >>= 4;
+
+    for(uint8_t i = 1; i < 8; i++) {
+        fix_data >>= 4;
+        var_data >>= 4;
+        sum += (fix_data & 0xF) + (var_data & 0xF);
+    }
+
+    // swap calculated sum nibbles
+    sum = (((sum >> 4) & 0xF) | (sum << 4)) & 0xFF;
+    if(sum == ref_sum)
+        furi_string_cat_printf(output, "Sum ok: 0x%hhX", ref_sum);
+    else
+        furi_string_cat_printf(output, "Sum err: 0x%hhX vs 0x%hhX", ref_sum, sum);
+}
+
+void ws_protocol_decoder_oregon3_get_string(void* context, FuriString* output) {
+    furi_assert(context);
+    WSProtocolDecoderOregon3* instance = context;
+    furi_string_cat_printf(
+        output,
+        "%s\r\n"
+        "ID: 0x%04lX, ch: %d, bat: %d, rc: 0x%02lX\r\n",
+        instance->generic.protocol_name,
+        instance->generic.id,
+        instance->generic.channel,
+        instance->generic.battery_low,
+        (uint32_t)(instance->generic.data >> 4) & 0xFF);
+
+    if(instance->var_bits > 0) {
+        furi_string_cat_printf(
+            output,
+            "Temp:%d.%d C Hum:%d%%",
+            (int16_t)instance->generic.temp,
+            abs(
+                ((int16_t)(instance->generic.temp * 10) -
+                 (((int16_t)instance->generic.temp) * 10))),
+            instance->generic.humidity);
+        oregon3_append_check_sum((uint32_t)instance->generic.data, instance->var_data, output);
+    }
+}
+
+const SubGhzProtocolDecoder ws_protocol_oregon3_decoder = {
+    .alloc = ws_protocol_decoder_oregon3_alloc,
+    .free = ws_protocol_decoder_oregon3_free,
+
+    .feed = ws_protocol_decoder_oregon3_feed,
+    .reset = ws_protocol_decoder_oregon3_reset,
+
+    .get_hash_data = ws_protocol_decoder_oregon3_get_hash_data,
+    .serialize = ws_protocol_decoder_oregon3_serialize,
+    .deserialize = ws_protocol_decoder_oregon3_deserialize,
+    .get_string = ws_protocol_decoder_oregon3_get_string,
+};
+
+const SubGhzProtocol ws_protocol_oregon3 = {
+    .name = WS_PROTOCOL_OREGON3_NAME,
+    .type = SubGhzProtocolWeatherStation,
+    .flag = SubGhzProtocolFlag_433 | SubGhzProtocolFlag_AM | SubGhzProtocolFlag_Decodable,
+
+    .decoder = &ws_protocol_oregon3_decoder,
+};

applications/external/weather_station/protocols/oregon3.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include <lib/subghz/protocols/base.h>
+
+#define WS_PROTOCOL_OREGON3_NAME "Oregon3"
+extern const SubGhzProtocol ws_protocol_oregon3;

applications/external/weather_station/protocols/protocol_items.c

@@ -11,6 +11,7 @@ const SubGhzProtocol* weather_station_protocol_registry_items[] = {
     &ws_protocol_lacrosse_tx,
     &ws_protocol_lacrosse_tx141thbv2,
     &ws_protocol_oregon2,
+    &ws_protocol_oregon3,
     &ws_protocol_acurite_592txr,
     &ws_protocol_ambient_weather,
     &ws_protocol_auriol_th,
@@ -21,4 +22,4 @@ const SubGhzProtocol* weather_station_protocol_registry_items[] = {
 
 const SubGhzProtocolRegistry weather_station_protocol_registry = {
     .items = weather_station_protocol_registry_items,
-    .size = COUNT_OF(weather_station_protocol_registry_items)};
+    .size = COUNT_OF(weather_station_protocol_registry_items)};

applications/external/weather_station/protocols/protocol_items.h

@@ -11,6 +11,7 @@
 #include "lacrosse_tx.h"
 #include "lacrosse_tx141thbv2.h"
 #include "oregon2.h"
+#include "oregon3.h"
 #include "acurite_592txr.h"
 #include "ambient_weather.h"
 #include "auriol_hg0601a.h"