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

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#include "ambient_weather.h"
#include <lib/toolbox/manchester_decoder.h>
#define TAG "WSProtocolAmbient_Weather"
/*
* Help
* https://github.com/merbanan/rtl_433/blob/master/src/devices/ambient_weather.c
*
* Decode Ambient Weather F007TH, F012TH, TF 30.3208.02, SwitchDoc F016TH.
* Devices supported:
* - Ambient Weather F007TH Thermo-Hygrometer.
* - Ambient Weather F012TH Indoor/Display Thermo-Hygrometer.
* - TFA senders 30.3208.02 from the TFA "Klima-Monitor" 30.3054,
* - SwitchDoc Labs F016TH.
* This decoder handles the 433mhz/868mhz thermo-hygrometers.
* The 915mhz (WH*) family of devices use different modulation/encoding.
* Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
* xxxxMMMM IIIIIIII BCCCTTTT TTTTTTTT HHHHHHHH MMMMMMMM
* - x: Unknown 0x04 on F007TH/F012TH
* - M: Model Number?, 0x05 on F007TH/F012TH/SwitchDocLabs F016TH
* - I: ID byte (8 bits), volatie, changes at power up,
* - B: Battery Low
* - C: Channel (3 bits 1-8) - F007TH set by Dip switch, F012TH soft setting
* - T: Temperature 12 bits - Fahrenheit * 10 + 400
* - H: Humidity (8 bits)
* - M: Message integrity check LFSR Digest-8, gen 0x98, key 0x3e, init 0x64
*
* three repeats without gap
* full preamble is 0x00145 (the last bits might not be fixed, e.g. 0x00146)
* and on decoding also 0xffd45
*/
#define AMBIENT_WEATHER_PACKET_HEADER_1 0xFFD440000000000 //0xffd45 .. 0xffd46
#define AMBIENT_WEATHER_PACKET_HEADER_2 0x001440000000000 //0x00145 .. 0x00146
#define AMBIENT_WEATHER_PACKET_HEADER_MASK 0xFFFFC0000000000
static const SubGhzBlockConst ws_protocol_ambient_weather_const = {
.te_short = 500,
.te_long = 1000,
.te_delta = 120,
.min_count_bit_for_found = 48,
};
struct WSProtocolDecoderAmbient_Weather {
SubGhzProtocolDecoderBase base;
SubGhzBlockDecoder decoder;
WSBlockGeneric generic;
ManchesterState manchester_saved_state;
uint16_t header_count;
};
struct WSProtocolEncoderAmbient_Weather {
SubGhzProtocolEncoderBase base;
SubGhzProtocolBlockEncoder encoder;
WSBlockGeneric generic;
};
const SubGhzProtocolDecoder ws_protocol_ambient_weather_decoder = {
.alloc = ws_protocol_decoder_ambient_weather_alloc,
.free = ws_protocol_decoder_ambient_weather_free,
.feed = ws_protocol_decoder_ambient_weather_feed,
.reset = ws_protocol_decoder_ambient_weather_reset,
.get_hash_data = ws_protocol_decoder_ambient_weather_get_hash_data,
.serialize = ws_protocol_decoder_ambient_weather_serialize,
.deserialize = ws_protocol_decoder_ambient_weather_deserialize,
.get_string = ws_protocol_decoder_ambient_weather_get_string,
};
const SubGhzProtocolEncoder ws_protocol_ambient_weather_encoder = {
.alloc = NULL,
.free = NULL,
.deserialize = NULL,
.stop = NULL,
.yield = NULL,
};
const SubGhzProtocol ws_protocol_ambient_weather = {
.name = WS_PROTOCOL_AMBIENT_WEATHER_NAME,
.type = SubGhzProtocolWeatherStation,
.flag = SubGhzProtocolFlag_433 | SubGhzProtocolFlag_315 | SubGhzProtocolFlag_868 |
SubGhzProtocolFlag_AM | SubGhzProtocolFlag_Decodable,
.decoder = &ws_protocol_ambient_weather_decoder,
.encoder = &ws_protocol_ambient_weather_encoder,
};
void* ws_protocol_decoder_ambient_weather_alloc(SubGhzEnvironment* environment) {
UNUSED(environment);
WSProtocolDecoderAmbient_Weather* instance = malloc(sizeof(WSProtocolDecoderAmbient_Weather));
instance->base.protocol = &ws_protocol_ambient_weather;
instance->generic.protocol_name = instance->base.protocol->name;
return instance;
}
void ws_protocol_decoder_ambient_weather_free(void* context) {
furi_assert(context);
WSProtocolDecoderAmbient_Weather* instance = context;
free(instance);
}
void ws_protocol_decoder_ambient_weather_reset(void* context) {
furi_assert(context);
WSProtocolDecoderAmbient_Weather* instance = context;
manchester_advance(
instance->manchester_saved_state,
ManchesterEventReset,
&instance->manchester_saved_state,
NULL);
}
static bool ws_protocol_ambient_weather_check_crc(WSProtocolDecoderAmbient_Weather* instance) {
uint8_t msg[] = {
instance->decoder.decode_data >> 40,
instance->decoder.decode_data >> 32,
instance->decoder.decode_data >> 24,
instance->decoder.decode_data >> 16,
instance->decoder.decode_data >> 8};
uint8_t crc = subghz_protocol_blocks_lfsr_digest8(msg, 5, 0x98, 0x3e) ^ 0x64;
return (crc == (uint8_t)(instance->decoder.decode_data & 0xFF));
}
/**
* Analysis of received data
* @param instance Pointer to a WSBlockGeneric* instance
*/
static void ws_protocol_ambient_weather_remote_controller(WSBlockGeneric* instance) {
instance->id = (instance->data >> 32) & 0xFF;
instance->battery_low = (instance->data >> 31) & 1;
instance->channel = ((instance->data >> 28) & 0x07) + 1;
instance->temp =
locale_fahrenheit_to_celsius(((float)((instance->data >> 16) & 0x0FFF) - 400.0f) / 10.0f);
instance->humidity = (instance->data >> 8) & 0xFF;
instance->btn = WS_NO_BTN;
// ToDo maybe it won't be needed
/*
Sanity checks to reduce false positives and other bad data
Packets with Bad data often pass the MIC check.
- humidity > 100 (such as 255) and
- temperatures > 140 F (such as 369.5 F and 348.8 F
Specs in the F007TH and F012TH manuals state the range is:
- Temperature: -40 to 140 F
- Humidity: 10 to 99%
@todo - sanity check b[0] "model number"
- 0x45 - F007TH and F012TH
- 0x?5 - SwitchDocLabs F016TH temperature sensor (based on comment b[0] & 0x0f == 5)
- ? - TFA 30.3208.02
if (instance->humidity < 0 || instance->humidity > 100) {
ERROR;
}
if (instance->temp < -40.0 || instance->temp > 140.0) {
ERROR;
}
*/
}
void ws_protocol_decoder_ambient_weather_feed(void* context, bool level, uint32_t duration) {
furi_assert(context);
WSProtocolDecoderAmbient_Weather* instance = context;
ManchesterEvent event = ManchesterEventReset;
if(!level) {
if(DURATION_DIFF(duration, ws_protocol_ambient_weather_const.te_short) <
ws_protocol_ambient_weather_const.te_delta) {
event = ManchesterEventShortLow;
} else if(
DURATION_DIFF(duration, ws_protocol_ambient_weather_const.te_long) <
ws_protocol_ambient_weather_const.te_delta * 2) {
event = ManchesterEventLongLow;
}
} else {
if(DURATION_DIFF(duration, ws_protocol_ambient_weather_const.te_short) <
ws_protocol_ambient_weather_const.te_delta) {
event = ManchesterEventShortHigh;
} else if(
DURATION_DIFF(duration, ws_protocol_ambient_weather_const.te_long) <
ws_protocol_ambient_weather_const.te_delta * 2) {
event = ManchesterEventLongHigh;
}
}
if(event != ManchesterEventReset) {
bool data;
bool data_ok = manchester_advance(
instance->manchester_saved_state, event, &instance->manchester_saved_state, &data);
if(data_ok) {
instance->decoder.decode_data = (instance->decoder.decode_data << 1) | !data;
}
if(((instance->decoder.decode_data & AMBIENT_WEATHER_PACKET_HEADER_MASK) ==
AMBIENT_WEATHER_PACKET_HEADER_1) ||
((instance->decoder.decode_data & AMBIENT_WEATHER_PACKET_HEADER_MASK) ==
AMBIENT_WEATHER_PACKET_HEADER_2)) {
if(ws_protocol_ambient_weather_check_crc(instance)) {
instance->generic.data = instance->decoder.decode_data;
instance->generic.data_count_bit =
ws_protocol_ambient_weather_const.min_count_bit_for_found;
ws_protocol_ambient_weather_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 {
instance->decoder.decode_data = 0;
instance->decoder.decode_count_bit = 0;
manchester_advance(
instance->manchester_saved_state,
ManchesterEventReset,
&instance->manchester_saved_state,
NULL);
}
}
uint8_t ws_protocol_decoder_ambient_weather_get_hash_data(void* context) {
furi_assert(context);
WSProtocolDecoderAmbient_Weather* instance = context;
return subghz_protocol_blocks_get_hash_data(
&instance->decoder, (instance->decoder.decode_count_bit / 8) + 1);
}
SubGhzProtocolStatus ws_protocol_decoder_ambient_weather_serialize(
void* context,
FlipperFormat* flipper_format,
SubGhzRadioPreset* preset) {
furi_assert(context);
WSProtocolDecoderAmbient_Weather* instance = context;
return ws_block_generic_serialize(&instance->generic, flipper_format, preset);
}
SubGhzProtocolStatus
ws_protocol_decoder_ambient_weather_deserialize(void* context, FlipperFormat* flipper_format) {
furi_assert(context);
WSProtocolDecoderAmbient_Weather* instance = context;
return ws_block_generic_deserialize_check_count_bit(
&instance->generic,
flipper_format,
ws_protocol_ambient_weather_const.min_count_bit_for_found);
}
void ws_protocol_decoder_ambient_weather_get_string(void* context, FuriString* output) {
furi_assert(context);
WSProtocolDecoderAmbient_Weather* 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);
}