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https://github.com/Next-Flip/Momentum-Firmware.git
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3351f9b636
* feat(subghz): added Bresser 3CH weather station Added the Bresser 3CH, a weather station supported by rtl_433 already. * Update changelog --------- Co-authored-by: Willy-JL <49810075+Willy-JL@users.noreply.github.com>
265 lines
10 KiB
C
265 lines
10 KiB
C
#include "bresser_3ch.h"
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#include "furi/core/log.h"
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#define TAG "WSProtocolBresser3ch"
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/*
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* Help:
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* https://github.com/merbanan/rtl_433/blob/master/src/devices/bresser_3ch.c
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*
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* Bresser sensor protocol.
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*
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* The protocol is for the wireless Temperature/Humidity sensor
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* - Bresser Thermo-/Hygro-Sensor 3CH
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* - also works for Renkforce DM-7511
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*
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* The sensor sends 15 identical packages of 40 bits each ~60s.
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* The bits are PWM modulated with On Off Keying.
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*
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* A short pulse of 250 us followed by a 500 us gap is a 0 bit,
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* a long pulse of 500 us followed by a 250 us gap is a 1 bit,
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* there is a sync preamble of pulse, gap, 750 us each, repeated 4 times.
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* Actual received and demodulated timings might be 2% shorter.
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*
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* The data is grouped in 5 bytes / 10 nibbles
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*
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* [id] [id] [flags] [temp] [temp] [temp] [humi] [humi] [chk] [chk]
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*
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* - id is an 8 bit random id that is generated when the sensor starts
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* - flags are 4 bits battery low indicator, test button press and channel
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* - temp is 12 bit unsigned fahrenheit offset by 90 and scaled by 10
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* - humi is 8 bit relative humidity percentage
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* - chk is the sum of the four data bytes
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*
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* @m7i-org - because there's more stuff screaming in the ether than you might think
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*
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*/
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static const SubGhzBlockConst ws_protocol_bresser_3ch_const = {
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.te_short = 250,
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.te_long = 500,
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.te_delta = 150,
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.min_count_bit_for_found = 40,
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};
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struct WSProtocolDecoderBresser3ch {
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SubGhzProtocolDecoderBase base;
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SubGhzBlockDecoder decoder;
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WSBlockGeneric generic;
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};
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struct WSProtocolEncoderBresser3ch {
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SubGhzProtocolEncoderBase base;
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SubGhzProtocolBlockEncoder encoder;
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WSBlockGeneric generic;
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};
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const SubGhzProtocolDecoder ws_protocol_bresser_3ch_decoder = {
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.alloc = ws_protocol_decoder_bresser_3ch_alloc,
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.free = ws_protocol_decoder_bresser_3ch_free,
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.feed = ws_protocol_decoder_bresser_3ch_feed,
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.reset = ws_protocol_decoder_bresser_3ch_reset,
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.get_hash_data = NULL,
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.get_hash_data_long = ws_protocol_decoder_bresser_3ch_get_hash_data,
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.serialize = ws_protocol_decoder_bresser_3ch_serialize,
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.deserialize = ws_protocol_decoder_bresser_3ch_deserialize,
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.get_string = ws_protocol_decoder_bresser_3ch_get_string,
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.get_string_brief = NULL,
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};
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const SubGhzProtocolEncoder ws_protocol_bresser_3ch_encoder = {
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.alloc = NULL,
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.free = NULL,
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.deserialize = NULL,
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.stop = NULL,
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.yield = NULL,
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};
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const SubGhzProtocol ws_protocol_bresser_3ch = {
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.name = WS_PROTOCOL_BRESSER_3CH_NAME,
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.type = SubGhzProtocolTypeStatic,
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.flag = SubGhzProtocolFlag_433 | SubGhzProtocolFlag_315 | SubGhzProtocolFlag_868 |
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SubGhzProtocolFlag_AM | SubGhzProtocolFlag_Decodable | SubGhzProtocolFlag_Load |
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SubGhzProtocolFlag_Save,
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.filter = SubGhzProtocolFilter_Weather,
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.decoder = &ws_protocol_bresser_3ch_decoder,
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.encoder = &ws_protocol_bresser_3ch_encoder,
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};
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typedef enum {
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Bresser3chDecoderStepReset = 0,
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Bresser3chDecoderStepPreambleDn,
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Bresser3chDecoderStepPreambleUp,
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Bresser3chDecoderStepSaveDuration,
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Bresser3chDecoderStepCheckDuration,
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} Bresser3chDecoderStep;
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void* ws_protocol_decoder_bresser_3ch_alloc(SubGhzEnvironment* environment) {
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UNUSED(environment);
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WSProtocolDecoderBresser3ch* instance = malloc(sizeof(WSProtocolDecoderBresser3ch));
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instance->base.protocol = &ws_protocol_bresser_3ch;
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instance->generic.protocol_name = instance->base.protocol->name;
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return instance;
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}
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void ws_protocol_decoder_bresser_3ch_free(void* context) {
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furi_assert(context);
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WSProtocolDecoderBresser3ch* instance = context;
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free(instance);
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}
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void ws_protocol_decoder_bresser_3ch_reset(void* context) {
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furi_assert(context);
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WSProtocolDecoderBresser3ch* instance = context;
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instance->decoder.parser_step = Bresser3chDecoderStepReset;
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}
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static bool ws_protocol_bresser_3ch_check(WSProtocolDecoderBresser3ch* instance) {
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if(!instance->decoder.decode_data) return false;
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uint8_t sum = (((instance->decoder.decode_data >> 32) & 0xff) +
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((instance->decoder.decode_data >> 24) & 0xff) +
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((instance->decoder.decode_data >> 16) & 0xff) +
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((instance->decoder.decode_data >> 8) & 0xff)) &
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0xff;
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return (instance->decoder.decode_data & 0xff) == sum;
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}
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/**
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* Analysis of received data
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* @param instance Pointer to a WSBlockGeneric* instance
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*/
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static void ws_protocol_bresser_3ch_extract_data(WSBlockGeneric* instance) {
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instance->id = (instance->data >> 32) & 0xff;
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instance->battery_low = ((instance->data >> 31) & 0x1);
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instance->btn = (instance->data >> 30) & 0x1;
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instance->channel = (instance->data >> 28) & 0x3;
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int16_t temp = (instance->data >> 16) & 0xfff;
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instance->temp = locale_fahrenheit_to_celsius((float)(temp - 900) / 10.0);
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instance->humidity = (instance->data >> 8) & 0xff;
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}
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void ws_protocol_decoder_bresser_3ch_feed(void* context, bool level, uint32_t duration) {
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furi_assert(context);
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WSProtocolDecoderBresser3ch* instance = context;
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switch(instance->decoder.parser_step) {
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case Bresser3chDecoderStepReset:
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if(level && DURATION_DIFF(duration, ws_protocol_bresser_3ch_const.te_short * 3) <
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ws_protocol_bresser_3ch_const.te_delta) {
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instance->decoder.te_last = duration;
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instance->decoder.parser_step = Bresser3chDecoderStepPreambleDn;
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instance->decoder.decode_data = 0;
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instance->decoder.decode_count_bit = 0;
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}
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break;
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case Bresser3chDecoderStepPreambleDn:
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if((!level) && DURATION_DIFF(duration, ws_protocol_bresser_3ch_const.te_short * 3) <
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ws_protocol_bresser_3ch_const.te_delta) {
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if(DURATION_DIFF(
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instance->decoder.te_last, ws_protocol_bresser_3ch_const.te_short * 12) <
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ws_protocol_bresser_3ch_const.te_delta * 2) {
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// End of sync after 4*750 (12*250) high values, start reading the message
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instance->decoder.parser_step = Bresser3chDecoderStepSaveDuration;
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} else {
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instance->decoder.parser_step = Bresser3chDecoderStepPreambleUp;
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}
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} else {
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instance->decoder.parser_step = Bresser3chDecoderStepReset;
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}
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break;
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case Bresser3chDecoderStepPreambleUp:
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if(level && DURATION_DIFF(duration, ws_protocol_bresser_3ch_const.te_short * 3) <
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ws_protocol_bresser_3ch_const.te_delta) {
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instance->decoder.te_last = instance->decoder.te_last + duration;
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instance->decoder.parser_step = Bresser3chDecoderStepPreambleDn;
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} else {
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instance->decoder.parser_step = Bresser3chDecoderStepReset;
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}
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break;
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case Bresser3chDecoderStepSaveDuration:
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if(instance->decoder.decode_count_bit ==
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ws_protocol_bresser_3ch_const.min_count_bit_for_found) {
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if(ws_protocol_bresser_3ch_check(instance)) {
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instance->generic.data = instance->decoder.decode_data;
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instance->generic.data_count_bit = instance->decoder.decode_count_bit;
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ws_protocol_bresser_3ch_extract_data(&instance->generic);
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if(instance->base.callback) {
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instance->base.callback(&instance->base, instance->base.context);
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}
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}
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instance->decoder.decode_data = 0;
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instance->decoder.decode_count_bit = 0;
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instance->decoder.parser_step = Bresser3chDecoderStepReset;
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} else if(level) {
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instance->decoder.te_last = duration;
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instance->decoder.parser_step = Bresser3chDecoderStepCheckDuration;
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} else {
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instance->decoder.parser_step = Bresser3chDecoderStepReset;
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}
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break;
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case Bresser3chDecoderStepCheckDuration:
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if(!level) {
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if(DURATION_DIFF(instance->decoder.te_last, ws_protocol_bresser_3ch_const.te_short) <
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ws_protocol_bresser_3ch_const.te_delta &&
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DURATION_DIFF(duration, ws_protocol_bresser_3ch_const.te_long) <
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ws_protocol_bresser_3ch_const.te_delta) {
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subghz_protocol_blocks_add_bit(&instance->decoder, 0);
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instance->decoder.parser_step = Bresser3chDecoderStepSaveDuration;
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} else if(
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DURATION_DIFF(instance->decoder.te_last, ws_protocol_bresser_3ch_const.te_long) <
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ws_protocol_bresser_3ch_const.te_delta &&
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DURATION_DIFF(duration, ws_protocol_bresser_3ch_const.te_short) <
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ws_protocol_bresser_3ch_const.te_delta) {
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subghz_protocol_blocks_add_bit(&instance->decoder, 1);
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instance->decoder.parser_step = Bresser3chDecoderStepSaveDuration;
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} else
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instance->decoder.parser_step = Bresser3chDecoderStepReset;
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} else
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instance->decoder.parser_step = Bresser3chDecoderStepReset;
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break;
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}
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}
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uint32_t ws_protocol_decoder_bresser_3ch_get_hash_data(void* context) {
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furi_assert(context);
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WSProtocolDecoderBresser3ch* instance = context;
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return subghz_protocol_blocks_get_hash_data_long(
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&instance->decoder, (instance->decoder.decode_count_bit / 8) + 1);
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}
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SubGhzProtocolStatus ws_protocol_decoder_bresser_3ch_serialize(
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void* context,
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FlipperFormat* flipper_format,
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SubGhzRadioPreset* preset) {
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furi_assert(context);
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WSProtocolDecoderBresser3ch* instance = context;
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return ws_block_generic_serialize(&instance->generic, flipper_format, preset);
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}
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SubGhzProtocolStatus
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ws_protocol_decoder_bresser_3ch_deserialize(void* context, FlipperFormat* flipper_format) {
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furi_assert(context);
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WSProtocolDecoderBresser3ch* instance = context;
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return ws_block_generic_deserialize_check_count_bit(
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&instance->generic, flipper_format, ws_protocol_bresser_3ch_const.min_count_bit_for_found);
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}
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void ws_protocol_decoder_bresser_3ch_get_string(void* context, FuriString* output) {
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furi_assert(context);
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WSProtocolDecoderBresser3ch* instance = context;
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ws_block_generic_get_string(&instance->generic, output);
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}
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