341 lines
13 KiB
C
341 lines
13 KiB
C
#include "gt_wt_03.h"
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#define TAG "WSProtocolGT_WT03"
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/*
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* Help
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* https://github.com/merbanan/rtl_433/blob/master/src/devices/gt_wt_03.c
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*
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*
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* Globaltronics GT-WT-03 sensor on 433.92MHz.
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* The 01-set sensor has 60 ms packet gap with 10 repeats.
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* The 02-set sensor has no packet gap with 23 repeats.
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* Example:
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* {41} 17 cf be fa 6a 80 [ S1 C1 26,1 C 78.9 F 48% Bat-Good Manual-Yes ]
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* {41} 17 cf be fa 6a 80 [ S1 C1 26,1 C 78.9 F 48% Bat-Good Manual-Yes Batt-Changed ]
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* {41} 17 cf fe fa ea 80 [ S1 C1 26,1 C 78.9 F 48% Bat-Good Manual-No Batt-Changed ]
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* {41} 01 cf 6f 11 b2 80 [ S2 C2 23,8 C 74.8 F 48% Bat-LOW Manual-No ]
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* {41} 01 c8 d0 2b 76 80 [ S2 C3 -4,4 C 24.1 F 55% Bat-Good Manual-No Batt-Changed ]
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* Format string:
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* ID:8h HUM:8d B:b M:b C:2d TEMP:12d CHK:8h 1x
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* Data layout:
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* TYP IIIIIIII HHHHHHHH BMCCTTTT TTTTTTTT XXXXXXXX
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* - I: Random Device Code: changes with battery reset
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* - H: Humidity: 8 Bit 00-99, Display LL=10%, Display HH=110% (Range 20-95%)
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* - B: Battery: 0=OK 1=LOW
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* - M: Manual Send Button Pressed: 0=not pressed, 1=pressed
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* - C: Channel: 00=CH1, 01=CH2, 10=CH3
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* - T: Temperature: 12 Bit 2's complement, scaled by 10, range-50.0 C (-50.1 shown as Lo) to +70.0 C (+70.1 C is shown as Hi)
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* - X: Checksum, xor shifting key per byte
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* Humidity:
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* - the working range is 20-95 %
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* - if "LL" in display view it sends 10 %
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* - if "HH" in display view it sends 110%
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* Checksum:
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* Per byte xor the key for each 1-bit, shift per bit. Key list per bit, starting at MSB:
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* - 0x00 [07]
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* - 0x80 [06]
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* - 0x40 [05]
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* - 0x20 [04]
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* - 0x10 [03]
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* - 0x88 [02]
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* - 0xc4 [01]
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* - 0x62 [00]
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* Note: this can also be seen as lower byte of a Galois/Fibonacci LFSR-16, gen 0x00, init 0x3100 (or 0x62 if reversed) resetting at every byte.
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* Battery voltages:
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* - U=<2,65V +- ~5% Battery indicator
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* - U=>2.10C +- 5% plausible readings
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* - U=2,00V +- ~5% Temperature offset -5°C Humidity offset unknown
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* - U=<1,95V +- ~5% does not initialize anymore
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* - U=1,90V +- 5% temperature offset -15°C
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* - U=1,80V +- 5% Display is showing refresh pattern
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* - U=1.75V +- ~5% TX causes cut out
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*
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*/
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static const SubGhzBlockConst ws_protocol_gt_wt_03_const = {
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.te_short = 285,
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.te_long = 570,
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.te_delta = 120,
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.min_count_bit_for_found = 41,
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};
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struct WSProtocolDecoderGT_WT03 {
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SubGhzProtocolDecoderBase base;
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SubGhzBlockDecoder decoder;
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WSBlockGeneric generic;
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uint16_t header_count;
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};
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struct WSProtocolEncoderGT_WT03 {
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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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typedef enum {
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GT_WT03DecoderStepReset = 0,
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GT_WT03DecoderStepCheckPreambule,
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GT_WT03DecoderStepSaveDuration,
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GT_WT03DecoderStepCheckDuration,
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} GT_WT03DecoderStep;
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const SubGhzProtocolDecoder ws_protocol_gt_wt_03_decoder = {
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.alloc = ws_protocol_decoder_gt_wt_03_alloc,
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.free = ws_protocol_decoder_gt_wt_03_free,
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.feed = ws_protocol_decoder_gt_wt_03_feed,
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.reset = ws_protocol_decoder_gt_wt_03_reset,
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.get_hash_data = ws_protocol_decoder_gt_wt_03_get_hash_data,
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.serialize = ws_protocol_decoder_gt_wt_03_serialize,
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.deserialize = ws_protocol_decoder_gt_wt_03_deserialize,
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.get_string = ws_protocol_decoder_gt_wt_03_get_string,
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};
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const SubGhzProtocolEncoder ws_protocol_gt_wt_03_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_gt_wt_03 = {
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.name = WS_PROTOCOL_GT_WT_03_NAME,
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.type = SubGhzProtocolWeatherStation,
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.flag = SubGhzProtocolFlag_433 | SubGhzProtocolFlag_315 | SubGhzProtocolFlag_868 |
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SubGhzProtocolFlag_AM | SubGhzProtocolFlag_Decodable,
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.decoder = &ws_protocol_gt_wt_03_decoder,
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.encoder = &ws_protocol_gt_wt_03_encoder,
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};
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void* ws_protocol_decoder_gt_wt_03_alloc(SubGhzEnvironment* environment) {
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UNUSED(environment);
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WSProtocolDecoderGT_WT03* instance = malloc(sizeof(WSProtocolDecoderGT_WT03));
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instance->base.protocol = &ws_protocol_gt_wt_03;
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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_gt_wt_03_free(void* context) {
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furi_assert(context);
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WSProtocolDecoderGT_WT03* instance = context;
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free(instance);
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}
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void ws_protocol_decoder_gt_wt_03_reset(void* context) {
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furi_assert(context);
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WSProtocolDecoderGT_WT03* instance = context;
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instance->decoder.parser_step = GT_WT03DecoderStepReset;
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}
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static bool ws_protocol_gt_wt_03_check_crc(WSProtocolDecoderGT_WT03* instance) {
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uint8_t msg[] = {
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instance->decoder.decode_data >> 33,
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instance->decoder.decode_data >> 25,
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instance->decoder.decode_data >> 17,
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instance->decoder.decode_data >> 9};
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uint8_t sum = 0;
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for(unsigned k = 0; k < sizeof(msg); ++k) {
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uint8_t data = msg[k];
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uint16_t key = 0x3100;
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for(int i = 7; i >= 0; --i) {
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// XOR key into sum if data bit is set
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if((data >> i) & 1) sum ^= key & 0xff;
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// roll the key right
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key = (key >> 1);
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}
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}
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return ((sum ^ (uint8_t)((instance->decoder.decode_data >> 1) & 0xFF)) == 0x2D);
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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_gt_wt_03_remote_controller(WSBlockGeneric* instance) {
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instance->id = instance->data >> 33;
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instance->humidity = (instance->data >> 25) & 0xFF;
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if(instance->humidity <= 10) { // actually the sensors sends 10 below working range of 20%
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instance->humidity = 0;
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} else if(instance->humidity > 95) { // actually the sensors sends 110 above working range of 90%
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instance->humidity = 100;
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}
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instance->battery_low = (instance->data >> 24) & 1;
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instance->btn = (instance->data >> 23) & 1;
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instance->channel = ((instance->data >> 21) & 0x03) + 1;
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if(!((instance->data >> 20) & 1)) {
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instance->temp = (float)((instance->data >> 9) & 0x07FF) / 10.0f;
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} else {
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instance->temp = (float)((~(instance->data >> 9) & 0x07FF) + 1) / -10.0f;
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}
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}
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void ws_protocol_decoder_gt_wt_03_feed(void* context, bool level, uint32_t duration) {
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furi_assert(context);
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WSProtocolDecoderGT_WT03* instance = context;
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switch(instance->decoder.parser_step) {
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case GT_WT03DecoderStepReset:
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if((level) && (DURATION_DIFF(duration, ws_protocol_gt_wt_03_const.te_short * 3) <
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ws_protocol_gt_wt_03_const.te_delta * 2)) {
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instance->decoder.parser_step = GT_WT03DecoderStepCheckPreambule;
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instance->decoder.te_last = duration;
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instance->header_count = 0;
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}
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break;
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case GT_WT03DecoderStepCheckPreambule:
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if(level) {
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instance->decoder.te_last = duration;
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} else {
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if((DURATION_DIFF(instance->decoder.te_last, ws_protocol_gt_wt_03_const.te_short * 3) <
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ws_protocol_gt_wt_03_const.te_delta * 2) &&
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(DURATION_DIFF(duration, ws_protocol_gt_wt_03_const.te_short * 3) <
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ws_protocol_gt_wt_03_const.te_delta * 2)) {
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//Found preambule
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instance->header_count++;
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} else if(instance->header_count == 4) {
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if((DURATION_DIFF(instance->decoder.te_last, ws_protocol_gt_wt_03_const.te_short) <
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ws_protocol_gt_wt_03_const.te_delta) &&
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(DURATION_DIFF(duration, ws_protocol_gt_wt_03_const.te_long) <
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ws_protocol_gt_wt_03_const.te_delta)) {
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instance->decoder.decode_data = 0;
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instance->decoder.decode_count_bit = 0;
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subghz_protocol_blocks_add_bit(&instance->decoder, 0);
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instance->decoder.parser_step = GT_WT03DecoderStepSaveDuration;
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} else if(
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(DURATION_DIFF(instance->decoder.te_last, ws_protocol_gt_wt_03_const.te_long) <
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ws_protocol_gt_wt_03_const.te_delta) &&
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(DURATION_DIFF(duration, ws_protocol_gt_wt_03_const.te_short) <
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ws_protocol_gt_wt_03_const.te_delta)) {
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instance->decoder.decode_data = 0;
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instance->decoder.decode_count_bit = 0;
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subghz_protocol_blocks_add_bit(&instance->decoder, 1);
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instance->decoder.parser_step = GT_WT03DecoderStepSaveDuration;
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} else {
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instance->decoder.parser_step = GT_WT03DecoderStepReset;
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}
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} else {
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instance->decoder.parser_step = GT_WT03DecoderStepReset;
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}
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}
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break;
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case GT_WT03DecoderStepSaveDuration:
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if(level) {
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instance->decoder.te_last = duration;
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instance->decoder.parser_step = GT_WT03DecoderStepCheckDuration;
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} else {
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instance->decoder.parser_step = GT_WT03DecoderStepReset;
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}
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break;
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case GT_WT03DecoderStepCheckDuration:
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if(!level) {
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if(((DURATION_DIFF(instance->decoder.te_last, ws_protocol_gt_wt_03_const.te_short * 3) <
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ws_protocol_gt_wt_03_const.te_delta * 2) &&
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(DURATION_DIFF(duration, ws_protocol_gt_wt_03_const.te_short * 3) <
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ws_protocol_gt_wt_03_const.te_delta * 2))) {
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if((instance->decoder.decode_count_bit ==
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ws_protocol_gt_wt_03_const.min_count_bit_for_found) &&
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ws_protocol_gt_wt_03_check_crc(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_gt_wt_03_remote_controller(&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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instance->decoder.decode_data = 0;
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instance->decoder.decode_count_bit = 0;
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instance->header_count = 1;
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instance->decoder.parser_step = GT_WT03DecoderStepCheckPreambule;
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break;
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} else if(
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(DURATION_DIFF(instance->decoder.te_last, ws_protocol_gt_wt_03_const.te_short) <
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ws_protocol_gt_wt_03_const.te_delta) &&
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(DURATION_DIFF(duration, ws_protocol_gt_wt_03_const.te_long) <
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ws_protocol_gt_wt_03_const.te_delta)) {
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subghz_protocol_blocks_add_bit(&instance->decoder, 0);
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instance->decoder.parser_step = GT_WT03DecoderStepSaveDuration;
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} else if(
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(DURATION_DIFF(instance->decoder.te_last, ws_protocol_gt_wt_03_const.te_long) <
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ws_protocol_gt_wt_03_const.te_delta) &&
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(DURATION_DIFF(duration, ws_protocol_gt_wt_03_const.te_short) <
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ws_protocol_gt_wt_03_const.te_delta)) {
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subghz_protocol_blocks_add_bit(&instance->decoder, 1);
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instance->decoder.parser_step = GT_WT03DecoderStepSaveDuration;
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} else {
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instance->decoder.parser_step = GT_WT03DecoderStepReset;
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}
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} else {
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instance->decoder.parser_step = GT_WT03DecoderStepReset;
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}
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break;
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}
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}
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uint8_t ws_protocol_decoder_gt_wt_03_get_hash_data(void* context) {
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furi_assert(context);
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WSProtocolDecoderGT_WT03* instance = context;
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return subghz_protocol_blocks_get_hash_data(
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&instance->decoder, (instance->decoder.decode_count_bit / 8) + 1);
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}
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bool ws_protocol_decoder_gt_wt_03_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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WSProtocolDecoderGT_WT03* instance = context;
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return ws_block_generic_serialize(&instance->generic, flipper_format, preset);
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}
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bool ws_protocol_decoder_gt_wt_03_deserialize(void* context, FlipperFormat* flipper_format) {
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furi_assert(context);
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WSProtocolDecoderGT_WT03* instance = context;
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bool ret = false;
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do {
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if(!ws_block_generic_deserialize(&instance->generic, flipper_format)) {
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break;
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}
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if(instance->generic.data_count_bit !=
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ws_protocol_gt_wt_03_const.min_count_bit_for_found) {
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FURI_LOG_E(TAG, "Wrong number of bits in key");
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break;
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}
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ret = true;
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} while(false);
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return ret;
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}
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void ws_protocol_decoder_gt_wt_03_get_string(void* context, FuriString* output) {
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furi_assert(context);
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WSProtocolDecoderGT_WT03* instance = context;
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furi_string_printf(
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output,
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"%s %dbit\r\n"
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"Key:0x%lX%08lX\r\n"
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"Sn:0x%lX Ch:%d Bat:%d\r\n"
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"Temp:%3.1f C Hum:%d%%",
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instance->generic.protocol_name,
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instance->generic.data_count_bit,
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(uint32_t)(instance->generic.data >> 32),
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(uint32_t)(instance->generic.data),
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instance->generic.id,
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instance->generic.channel,
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instance->generic.battery_low,
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(double)instance->generic.temp,
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instance->generic.humidity);
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}
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