Add support for ThermoPro TX-2C (#2466)

Co-authored-by: Igor Pelesic <igor@pele.tech>

include/rtl_433_devices.h

@@ -252,6 +252,7 @@
     DECL(baldr_rain) \
     DECL(celsia_czc1) \
     DECL(fineoffset_ws90) \
+    DECL(thermopro_tx2c) \
 
     /* Add new decoders here. */
 

src/CMakeLists.txt

@@ -225,6 +225,7 @@ add_library(r_433 STATIC
     devices/thermopro_tp11.c
     devices/thermopro_tp12.c
     devices/thermopro_tx2.c
+    devices/thermopro_tx2c.c
     devices/tpms_abarth124.c
     devices/tpms_ave.c
     devices/tpms_citroen.c

src/devices/thermopro_tx2c.c

@@ -0,0 +1,91 @@
+/** @file
+    Thermopro TX-2C Thermometer.
+
+    Copyright (C) 2023 igor@pele.tech.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+*/
+/**
+Thermopro TX-2C Thermometer.
+
+normal sequence of bit rows:
+
+        [00] { 7} 00                : 0000000
+        [01] {45} 95 00 ff e0 a0 00 : 10010101 00000000 11111111 11100000 10100000 00000
+        [02] {45} 95 00 ff e0 a0 00 : 10010101 00000000 11111111 11100000 10100000 00000
+        [03] {45} 95 00 ff e0 a0 00 : 10010101 00000000 11111111 11100000 10100000 00000
+        [04] {45} 95 00 ff e0 a0 00 : 10010101 00000000 11111111 11100000 10100000 00000
+        [05] {45} 95 00 ff e0 a0 00 : 10010101 00000000 11111111 11100000 10100000 00000
+        [06] {45} 95 00 ff e0 a0 00 : 10010101 00000000 11111111 11100000 10100000 00000
+        [07] {45} 95 00 ff e0 a0 00 : 10010101 00000000 11111111 11100000 10100000 00000
+        [08] {36} 95 00 ff e0 a0    : 10010101 00000000 11111111 11100000 1010
+
+Data layout:
+
+    II ZZ TTT UU Z
+
+    - I: 8 bit ID
+    - Z: 8 bit zeros
+    - T: 12 bit temperature (scale 16)
+    - U: 8 bit unknown (constant)
+    - Z: 5 bit zeros
+
+
+*/
+#include "decoder.h"
+
+static int thermopro_tx2c_sensor_callback(r_device *decoder, bitbuffer_t *bitbuffer)
+{
+    // Compare first four bytes of rows that have 45 or 36 bits.
+    int row = bitbuffer_find_repeated_row(bitbuffer, 4, 36);
+    if (row < 0)
+        return DECODE_ABORT_EARLY;
+    uint8_t *b = bitbuffer->bb[row];
+
+    if (bitbuffer->bits_per_row[row] > 45)
+        return DECODE_ABORT_LENGTH;
+    
+    // No need to decode/extract values for simple test
+    if ((!b[0] && !b[1] && !b[2] && !b[3])
+            || (b[0] == 0xff && b[1] == 0xff && b[2] == 0xff && b[3] == 0xff)) {
+        decoder_log(decoder, 2, __func__, "DECODE_FAIL_SANITY data all 0x00 or 0xFF");
+        return DECODE_FAIL_SANITY;
+    }
+
+    int device   = (b[0]);
+    int16_t temp_raw = ((b[2] << 8) | b[3]);
+    float temp_c = (temp_raw/16) * 0.1f;
+
+    /* clang-format off */
+    data_t *data = data_make(
+            "model",         "",            DATA_STRING, "ThermoPro-TX-2C",
+            "id",            "Id",          DATA_INT,    device,
+            "temperature_C", "Temperature", DATA_FORMAT, "%.01f C", DATA_DOUBLE, temp_c,
+            "mic",           "Integrity",   DATA_STRING, "CRC",
+            NULL);
+    /* clang-format on */
+    decoder_output_data(decoder, data);
+    return 1;
+}
+
+static char const *const output_fields[] = {
+        "model",
+        "id",
+        "temperature_C",
+        "mic",
+        NULL,
+};
+
+r_device const thermopro_tx2c = {
+        .name        = "ThermoPro TX-2C Thermometer",
+        .modulation  = OOK_PULSE_PPM,
+        .short_width = 1958,
+        .long_width  = 3825,
+        .gap_limit   = 3829,
+        .reset_limit = 8643,
+        .decode_fn   = &thermopro_tx2c_sensor_callback,
+        .fields      = output_fields,
+};