flipperzero-firmware/applications/plugins/weather_station/protocols/acurite_609txc.c

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#include "acurite_609txc.h"
#define TAG "WSProtocolAcurite_609TXC"
/*
* Help
* https://github.com/merbanan/rtl_433/blob/5bef4e43133ac4c0e2d18d36f87c52b4f9458453/src/devices/acurite.c#L216
*
* 0000 1111 | 0011 0000 | 0101 1100 | 0000 0000 | 1110 0111
* iiii iiii | buuu tttt | tttt tttt | hhhh hhhh | cccc cccc
* - i: identification; changes on battery switch
* - c: checksum (sum of previous by bytes)
* - u: unknown
* - b: battery low; flag to indicate low battery voltage
* - t: temperature; in °C * 10, 12 bit with complement
* - h: humidity
*
*/
static const SubGhzBlockConst ws_protocol_acurite_609txc_const = {
.te_short = 500,
.te_long = 1000,
.te_delta = 150,
.min_count_bit_for_found = 40,
};
struct WSProtocolDecoderAcurite_609TXC {
SubGhzProtocolDecoderBase base;
SubGhzBlockDecoder decoder;
WSBlockGeneric generic;
};
struct WSProtocolEncoderAcurite_609TXC {
SubGhzProtocolEncoderBase base;
SubGhzProtocolBlockEncoder encoder;
WSBlockGeneric generic;
};
typedef enum {
Acurite_609TXCDecoderStepReset = 0,
Acurite_609TXCDecoderStepSaveDuration,
Acurite_609TXCDecoderStepCheckDuration,
} Acurite_609TXCDecoderStep;
const SubGhzProtocolDecoder ws_protocol_acurite_609txc_decoder = {
.alloc = ws_protocol_decoder_acurite_609txc_alloc,
.free = ws_protocol_decoder_acurite_609txc_free,
.feed = ws_protocol_decoder_acurite_609txc_feed,
.reset = ws_protocol_decoder_acurite_609txc_reset,
.get_hash_data = ws_protocol_decoder_acurite_609txc_get_hash_data,
.serialize = ws_protocol_decoder_acurite_609txc_serialize,
.deserialize = ws_protocol_decoder_acurite_609txc_deserialize,
.get_string = ws_protocol_decoder_acurite_609txc_get_string,
};
const SubGhzProtocolEncoder ws_protocol_acurite_609txc_encoder = {
.alloc = NULL,
.free = NULL,
.deserialize = NULL,
.stop = NULL,
.yield = NULL,
};
const SubGhzProtocol ws_protocol_acurite_609txc = {
.name = WS_PROTOCOL_ACURITE_609TXC_NAME,
.type = SubGhzProtocolWeatherStation,
.flag = SubGhzProtocolFlag_433 | SubGhzProtocolFlag_315 | SubGhzProtocolFlag_868 |
SubGhzProtocolFlag_AM | SubGhzProtocolFlag_Decodable,
.decoder = &ws_protocol_acurite_609txc_decoder,
.encoder = &ws_protocol_acurite_609txc_encoder,
};
void* ws_protocol_decoder_acurite_609txc_alloc(SubGhzEnvironment* environment) {
UNUSED(environment);
WSProtocolDecoderAcurite_609TXC* instance = malloc(sizeof(WSProtocolDecoderAcurite_609TXC));
instance->base.protocol = &ws_protocol_acurite_609txc;
instance->generic.protocol_name = instance->base.protocol->name;
return instance;
}
void ws_protocol_decoder_acurite_609txc_free(void* context) {
furi_assert(context);
WSProtocolDecoderAcurite_609TXC* instance = context;
free(instance);
}
void ws_protocol_decoder_acurite_609txc_reset(void* context) {
furi_assert(context);
WSProtocolDecoderAcurite_609TXC* instance = context;
instance->decoder.parser_step = Acurite_609TXCDecoderStepReset;
}
static bool ws_protocol_acurite_609txc_check(WSProtocolDecoderAcurite_609TXC* instance) {
if(!instance->decoder.decode_data) return false;
uint8_t crc = (uint8_t)(instance->decoder.decode_data >> 32) +
(uint8_t)(instance->decoder.decode_data >> 24) +
(uint8_t)(instance->decoder.decode_data >> 16) +
(uint8_t)(instance->decoder.decode_data >> 8);
return (crc == (instance->decoder.decode_data & 0xFF));
}
/**
* Analysis of received data
* @param instance Pointer to a WSBlockGeneric* instance
*/
static void ws_protocol_acurite_609txc_remote_controller(WSBlockGeneric* instance) {
instance->id = (instance->data >> 32) & 0xFF;
instance->battery_low = (instance->data >> 31) & 1;
instance->channel = WS_NO_CHANNEL;
// Temperature in Celsius is encoded as a 12 bit integer value
// multiplied by 10 using the 4th - 6th nybbles (bytes 1 & 2)
// negative values are recovered by sign extend from int16_t.
int16_t temp_raw =
(int16_t)(((instance->data >> 12) & 0xf000) | ((instance->data >> 16) << 4));
instance->temp = (temp_raw >> 4) * 0.1f;
instance->humidity = (instance->data >> 8) & 0xff;
instance->btn = WS_NO_BTN;
}
void ws_protocol_decoder_acurite_609txc_feed(void* context, bool level, uint32_t duration) {
furi_assert(context);
WSProtocolDecoderAcurite_609TXC* instance = context;
switch(instance->decoder.parser_step) {
case Acurite_609TXCDecoderStepReset:
if((!level) && (DURATION_DIFF(duration, ws_protocol_acurite_609txc_const.te_short * 17) <
ws_protocol_acurite_609txc_const.te_delta * 8)) {
//Found syncPrefix
instance->decoder.parser_step = Acurite_609TXCDecoderStepSaveDuration;
instance->decoder.decode_data = 0;
instance->decoder.decode_count_bit = 0;
}
break;
case Acurite_609TXCDecoderStepSaveDuration:
if(level) {
instance->decoder.te_last = duration;
instance->decoder.parser_step = Acurite_609TXCDecoderStepCheckDuration;
} else {
instance->decoder.parser_step = Acurite_609TXCDecoderStepReset;
}
break;
case Acurite_609TXCDecoderStepCheckDuration:
if(!level) {
if(DURATION_DIFF(instance->decoder.te_last, ws_protocol_acurite_609txc_const.te_short) <
ws_protocol_acurite_609txc_const.te_delta) {
if((DURATION_DIFF(duration, ws_protocol_acurite_609txc_const.te_short) <
ws_protocol_acurite_609txc_const.te_delta) ||
(duration > ws_protocol_acurite_609txc_const.te_long * 3)) {
//Found syncPostfix
instance->decoder.parser_step = Acurite_609TXCDecoderStepReset;
if((instance->decoder.decode_count_bit ==
ws_protocol_acurite_609txc_const.min_count_bit_for_found) &&
ws_protocol_acurite_609txc_check(instance)) {
instance->generic.data = instance->decoder.decode_data;
instance->generic.data_count_bit = instance->decoder.decode_count_bit;
ws_protocol_acurite_609txc_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_609txc_const.te_long) <
ws_protocol_acurite_609txc_const.te_delta * 2) {
subghz_protocol_blocks_add_bit(&instance->decoder, 0);
instance->decoder.parser_step = Acurite_609TXCDecoderStepSaveDuration;
} else if(
DURATION_DIFF(duration, ws_protocol_acurite_609txc_const.te_long * 2) <
ws_protocol_acurite_609txc_const.te_delta * 4) {
subghz_protocol_blocks_add_bit(&instance->decoder, 1);
instance->decoder.parser_step = Acurite_609TXCDecoderStepSaveDuration;
} else {
instance->decoder.parser_step = Acurite_609TXCDecoderStepReset;
}
} else {
instance->decoder.parser_step = Acurite_609TXCDecoderStepReset;
}
} else {
instance->decoder.parser_step = Acurite_609TXCDecoderStepReset;
}
break;
}
}
uint8_t ws_protocol_decoder_acurite_609txc_get_hash_data(void* context) {
furi_assert(context);
WSProtocolDecoderAcurite_609TXC* instance = context;
return subghz_protocol_blocks_get_hash_data(
&instance->decoder, (instance->decoder.decode_count_bit / 8) + 1);
}
bool ws_protocol_decoder_acurite_609txc_serialize(
void* context,
FlipperFormat* flipper_format,
SubGhzRadioPreset* preset) {
furi_assert(context);
WSProtocolDecoderAcurite_609TXC* instance = context;
return ws_block_generic_serialize(&instance->generic, flipper_format, preset);
}
bool ws_protocol_decoder_acurite_609txc_deserialize(void* context, FlipperFormat* flipper_format) {
furi_assert(context);
WSProtocolDecoderAcurite_609TXC* instance = context;
bool ret = false;
do {
if(!ws_block_generic_deserialize(&instance->generic, flipper_format)) {
break;
}
if(instance->generic.data_count_bit !=
ws_protocol_acurite_609txc_const.min_count_bit_for_found) {
FURI_LOG_E(TAG, "Wrong number of bits in key");
break;
}
ret = true;
} while(false);
return ret;
}
void ws_protocol_decoder_acurite_609txc_get_string(void* context, FuriString* output) {
furi_assert(context);
WSProtocolDecoderAcurite_609TXC* 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 >> 40),
(uint32_t)(instance->generic.data),
instance->generic.id,
instance->generic.channel,
instance->generic.battery_low,
(double)instance->generic.temp,
instance->generic.humidity);
}