flipperzero-firmware/applications/external/weather_station/protocols/acurite_606tx.c

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#include "acurite_606tx.h"
#define TAG "WSProtocolAcurite_606TX"
/*
* Help
* https://github.com/merbanan/rtl_433/blob/5bef4e43133ac4c0e2d18d36f87c52b4f9458453/src/devices/acurite.c#L1644
*
* 0000 1111 | 0011 0000 | 0101 1100 | 1110 0111
* iiii iiii | buuu tttt | tttt tttt | cccc cccc
* - i: identification; changes on battery switch
* - c: lfsr_digest8;
* - u: unknown;
* - b: battery low; flag to indicate low battery voltage
* - t: Temperature; in °C
*
*/
static const SubGhzBlockConst ws_protocol_acurite_606tx_const = {
.te_short = 500,
.te_long = 2000,
.te_delta = 150,
.min_count_bit_for_found = 32,
};
struct WSProtocolDecoderAcurite_606TX {
SubGhzProtocolDecoderBase base;
SubGhzBlockDecoder decoder;
WSBlockGeneric generic;
};
struct WSProtocolEncoderAcurite_606TX {
SubGhzProtocolEncoderBase base;
SubGhzProtocolBlockEncoder encoder;
WSBlockGeneric generic;
};
typedef enum {
Acurite_606TXDecoderStepReset = 0,
Acurite_606TXDecoderStepSaveDuration,
Acurite_606TXDecoderStepCheckDuration,
} Acurite_606TXDecoderStep;
const SubGhzProtocolDecoder ws_protocol_acurite_606tx_decoder = {
.alloc = ws_protocol_decoder_acurite_606tx_alloc,
.free = ws_protocol_decoder_acurite_606tx_free,
.feed = ws_protocol_decoder_acurite_606tx_feed,
.reset = ws_protocol_decoder_acurite_606tx_reset,
.get_hash_data = ws_protocol_decoder_acurite_606tx_get_hash_data,
.serialize = ws_protocol_decoder_acurite_606tx_serialize,
.deserialize = ws_protocol_decoder_acurite_606tx_deserialize,
.get_string = ws_protocol_decoder_acurite_606tx_get_string,
};
const SubGhzProtocolEncoder ws_protocol_acurite_606tx_encoder = {
.alloc = NULL,
.free = NULL,
.deserialize = NULL,
.stop = NULL,
.yield = NULL,
};
const SubGhzProtocol ws_protocol_acurite_606tx = {
.name = WS_PROTOCOL_ACURITE_606TX_NAME,
.type = SubGhzProtocolWeatherStation,
.flag = SubGhzProtocolFlag_433 | SubGhzProtocolFlag_315 | SubGhzProtocolFlag_868 |
SubGhzProtocolFlag_AM | SubGhzProtocolFlag_Decodable,
.decoder = &ws_protocol_acurite_606tx_decoder,
.encoder = &ws_protocol_acurite_606tx_encoder,
};
void* ws_protocol_decoder_acurite_606tx_alloc(SubGhzEnvironment* environment) {
UNUSED(environment);
WSProtocolDecoderAcurite_606TX* instance = malloc(sizeof(WSProtocolDecoderAcurite_606TX));
instance->base.protocol = &ws_protocol_acurite_606tx;
instance->generic.protocol_name = instance->base.protocol->name;
return instance;
}
void ws_protocol_decoder_acurite_606tx_free(void* context) {
furi_assert(context);
WSProtocolDecoderAcurite_606TX* instance = context;
free(instance);
}
void ws_protocol_decoder_acurite_606tx_reset(void* context) {
furi_assert(context);
WSProtocolDecoderAcurite_606TX* instance = context;
instance->decoder.parser_step = Acurite_606TXDecoderStepReset;
}
static bool ws_protocol_acurite_606tx_check(WSProtocolDecoderAcurite_606TX* instance) {
if(!instance->decoder.decode_data) return false;
uint8_t msg[] = {
instance->decoder.decode_data >> 24,
instance->decoder.decode_data >> 16,
instance->decoder.decode_data >> 8};
uint8_t crc = subghz_protocol_blocks_lfsr_digest8(msg, 3, 0x98, 0xF1);
return (crc == (instance->decoder.decode_data & 0xFF));
}
/**
* Analysis of received data
* @param instance Pointer to a WSBlockGeneric* instance
*/
static void ws_protocol_acurite_606tx_remote_controller(WSBlockGeneric* instance) {
instance->id = (instance->data >> 24) & 0xFF;
instance->battery_low = (instance->data >> 23) & 1;
instance->channel = WS_NO_CHANNEL;
if(!((instance->data >> 19) & 1)) {
instance->temp = (float)((instance->data >> 8) & 0x07FF) / 10.0f;
} else {
instance->temp = (float)((~(instance->data >> 8) & 0x07FF) + 1) / -10.0f;
}
instance->btn = WS_NO_BTN;
instance->humidity = WS_NO_HUMIDITY;
}
void ws_protocol_decoder_acurite_606tx_feed(void* context, bool level, uint32_t duration) {
furi_assert(context);
WSProtocolDecoderAcurite_606TX* instance = context;
switch(instance->decoder.parser_step) {
case Acurite_606TXDecoderStepReset:
if((!level) && (DURATION_DIFF(duration, ws_protocol_acurite_606tx_const.te_short * 17) <
ws_protocol_acurite_606tx_const.te_delta * 8)) {
//Found syncPrefix
instance->decoder.parser_step = Acurite_606TXDecoderStepSaveDuration;
instance->decoder.decode_data = 0;
instance->decoder.decode_count_bit = 0;
}
break;
case Acurite_606TXDecoderStepSaveDuration:
if(level) {
instance->decoder.te_last = duration;
instance->decoder.parser_step = Acurite_606TXDecoderStepCheckDuration;
} else {
instance->decoder.parser_step = Acurite_606TXDecoderStepReset;
}
break;
case Acurite_606TXDecoderStepCheckDuration:
if(!level) {
if(DURATION_DIFF(instance->decoder.te_last, ws_protocol_acurite_606tx_const.te_short) <
ws_protocol_acurite_606tx_const.te_delta) {
if((DURATION_DIFF(duration, ws_protocol_acurite_606tx_const.te_short) <
ws_protocol_acurite_606tx_const.te_delta) ||
(duration > ws_protocol_acurite_606tx_const.te_long * 3)) {
//Found syncPostfix
instance->decoder.parser_step = Acurite_606TXDecoderStepReset;
if((instance->decoder.decode_count_bit ==
ws_protocol_acurite_606tx_const.min_count_bit_for_found) &&
ws_protocol_acurite_606tx_check(instance)) {
instance->generic.data = instance->decoder.decode_data;
instance->generic.data_count_bit = instance->decoder.decode_count_bit;
ws_protocol_acurite_606tx_remote_controller(&instance->generic);
if(instance->base.callback)
instance->base.callback(&instance->base, instance->base.context);
}
instance->decoder.decode_data = 0;
instance->decoder.decode_count_bit = 0;
} else if(
DURATION_DIFF(duration, ws_protocol_acurite_606tx_const.te_long) <
ws_protocol_acurite_606tx_const.te_delta * 2) {
subghz_protocol_blocks_add_bit(&instance->decoder, 0);
instance->decoder.parser_step = Acurite_606TXDecoderStepSaveDuration;
} else if(
DURATION_DIFF(duration, ws_protocol_acurite_606tx_const.te_long * 2) <
ws_protocol_acurite_606tx_const.te_delta * 4) {
subghz_protocol_blocks_add_bit(&instance->decoder, 1);
instance->decoder.parser_step = Acurite_606TXDecoderStepSaveDuration;
} else {
instance->decoder.parser_step = Acurite_606TXDecoderStepReset;
}
} else {
instance->decoder.parser_step = Acurite_606TXDecoderStepReset;
}
} else {
instance->decoder.parser_step = Acurite_606TXDecoderStepReset;
}
break;
}
}
uint8_t ws_protocol_decoder_acurite_606tx_get_hash_data(void* context) {
furi_assert(context);
WSProtocolDecoderAcurite_606TX* instance = context;
return subghz_protocol_blocks_get_hash_data(
&instance->decoder, (instance->decoder.decode_count_bit / 8) + 1);
}
SubGhzProtocolStatus ws_protocol_decoder_acurite_606tx_serialize(
void* context,
FlipperFormat* flipper_format,
SubGhzRadioPreset* preset) {
furi_assert(context);
WSProtocolDecoderAcurite_606TX* instance = context;
return ws_block_generic_serialize(&instance->generic, flipper_format, preset);
}
SubGhzProtocolStatus
ws_protocol_decoder_acurite_606tx_deserialize(void* context, FlipperFormat* flipper_format) {
furi_assert(context);
WSProtocolDecoderAcurite_606TX* instance = context;
return ws_block_generic_deserialize_check_count_bit(
&instance->generic,
flipper_format,
ws_protocol_acurite_606tx_const.min_count_bit_for_found);
}
void ws_protocol_decoder_acurite_606tx_get_string(void* context, FuriString* output) {
furi_assert(context);
WSProtocolDecoderAcurite_606TX* instance = context;
furi_string_printf(
output,
"%s %dbit\r\n"
"Key:0x%lX%08lX\r\n"
"Sn:0x%lX Ch:%d Bat:%d\r\n"
"Temp:%3.1f C Hum:%d%%",
instance->generic.protocol_name,
instance->generic.data_count_bit,
(uint32_t)(instance->generic.data >> 32),
(uint32_t)(instance->generic.data),
instance->generic.id,
instance->generic.channel,
instance->generic.battery_low,
(double)instance->generic.temp,
instance->generic.humidity);
}